wf1907sch

Published by LITE-ON Service Printed in Taiwan All rights reserved Subject to modification 31th Oct-2006©

Any person attempting to service this chassis must familarize with the chassis and be aware of the necessary safety

precautions to be used when serving electronic equipment containing high voltage.

June.19th-2006

Service Manual

Service

HP

HP 1907 & W1907WF

HP_LCD_W1907&WF1907_SM061031V00

Table of Contents

01. ----------------------------------------------------------------01

02. --------------------------------------------------------------------------------------02

03. --------------------------------------------------------------------------------03

04. ------------------------------------------------------------------------------------10

05. -------------------------------------------------------------------------------------------24

Power Board Operation Theory

Inverter Circuit

Interface Operation

Troubleshooting

Schematic

Safety Notice

HP W1907& WF1907 Service Manual

1. Power Board Operation Theory 1.1 Line filter consists of C801, T801, C802, C803, C804, C808, C809, C815, C819, C820, C825. It eliminates high frequency interference to meet EMI’s requirement. 1.2 Rec & Filter Bridge diode D812, D813, D814, D815 converts AC source into pulsed DC. This pulsed DC is smoothed and filtered by C805. R802 is an NTC (negative thermal coefficient ) resistor, used to reduce inrush current to be within safe range. 1.3 Power transformer : T802 converts energy for square wave from power source C805 to secondary side to generate +5V, +12V and +22V. 1.4 Output : The square wave from T802 is rectified by D808 D809, D810, then filtered by C817, C818, C824, C823, C830, C833, C822 to generate +22.5V and +12V, +5V respectively. 1.5 Driver : Q803 drive T802 from PWM control of I801 for power converted. 1.6 FB : Negative feedback CKT consists of photo coupler I802 and adjustable regulator I803. It can maintain output voltages +22.5V and +12V, +5V at a stable level. 1.7 PWM :

1.7.1 Start : When power is turned on. C807 is charged a 11V and a starting current above 40uA to pin 1 of I801. I801 starts to oscillate and outputs a pulse train through pin 6 to drive Q803.

1.7.2 OPP : When Q803 turns on, C805 supplies a linearly increasing triangle current through the primary inductance of T802 to the driver Q803, once the peak value of this current multiplied by R811 exceeds 0.52V, pulse train will be turn off immediately to protect Q803, T802 from being burned out.

1.7.3 Regulation : If output voltage +22V goes up, the R terminal of I803 gets more bias, accordingly photo transistor and photo diode flows more current. The voltage of pin 2 goes up too, making the pulse width of pin 6 to become narrower. So the output voltage +22V will be pulled down to a stable value.

1.7.4 OVP : If +22.5V goes up too much, the induced voltage on pin 4 of T802 becomes large also. Suppose that it is over 20V. The pulse train at pin 6 goes down to zero, shutting Q803 off immediately.

1.7.5 SCP : If output terminal is short to ground, photo transistor does not conduct, hence I802 does not conduct either. Then oscillation of I801 is stop, shutting Q803 off immediately.

2. Inverter Circuit This unit operates on an output voltage of 22V from power source. 2.1 VDD: R105 get a +5VDC for I101 power supply. 2.2 Control IC: I101 (OZ9938)

2.2.1 Enable : When pin 1 of I101 is over 2V, I101 works. If it is under 1V, I101 turns off.

2.2.2 OSC: When I101 enabled, C104/R118/R107 (pin 13 of I101) determine the operating frequency.

2.2.3 SST: C106 (pin 12 of I101) provides soft start function.

2.2.4 Ignition: IC provides higher operating frequency internally for more striking voltage until regulation of feedback of lamp current. And provide 2 sec striking time.

2.2.5 Dimming control: The external PWM voltage of R136/C111 control the duty pulse of burst-mode to drive and perform a wide dimming control for the CCFL. The burst-mode frequency is determined by scalor IC.

2.2.6 Regulation: Pin 5 of I101 provide regulation of the CCFL current from feedback. The non-inverting reference is at 1.25V nominal.

2.2.7 Protection: Open-lamp protection in the ignition period is provided through pin 6 of I101. Removal of the CCFL during normal operation will trigger IC to turns on and shuts off the inverter. This is latch function.

2.2.8 Output drivers: The configuration prevents any shoot-through issue associated with bridge-type power conversion applications. Adjusting the overlap conduction between Q104, Q105, the CCFL current regulation is achieved.

2.3 Half-bridge switching/Transformer: Q104, Q105, C122, C123, C134 compose half-bridge switching to convert DC into AC for driver the CCFL. 2.4 Detection: C112, C114, C115, C116, C118, C119, R126, R116, R115, R117, R119, R121, R122, R125 detect the output voltage and ensure a rated voltage by pin 6 of I101 ensure not a open-lamp. 2.5 Feedback: D116, D117, D120, D121, R111, R130 sense the lamp current for negative feedback and regulation.

3. Interface Operation 3.1 Top (Circuit diagrams sheet 2 of 8) This page is function block. (1) Power. (2) VGA & DDC interface. (3) DVI & DDC interface. (4) Scaler Gm5726H (Gm5766H). (5) Key & panel interface. (6) Audio. 3.2 Power (Circuit diagrams sheet 3 of 8)

3.2.1 P301 connector A 5V power supply for LCD module, also it is main power of interface board. A VDD (+5V) power supply for audio AMP. It is generated from the P301 connector. And adjust back light of LCD module from I306 sclaer Gm5726H (Gm5766H) control.

3.2.2 I302 : 3-terminal regulator A 3.3V power supply for I306 scaler IC Gm5726H (Gm5766H) and I308 EEPROM / I309 SPI flash ROM, it is generated from the 5V source.

3.2.3 I303 : 3-terminal regulator A 1.8V power supply for I306 scaler IC Gm5726H (Gm5766H), it is generated from the 3.3V source (I302).

3.2.4 Q302, I301 : ON/OFF control for LCD module power ON/OFF control (PANELVCC_EN) is performed for power ON/OFF and also for the power saving sequence. It is support 5V to LCD module power. The PANELVCC_EN signal is generated from I306 scaler IC Gm5726H (Gm5766H).

3.2.5 R305 : ON/OFF control for LCD module back light power ON/OFF control (BKLT_EN) is performed for black light power ON/OFF and also for the power saving sequence. The BKLT_EN signal is generated from I306 scaler IC Gm5726H (Gm5766H).

3.2.6 Q301, R301, R302, R304 : Adjust back light luminance of LCD module It is adjusted back light luminance control (BKLT_ADJ) is performed for the back light luminance. The BKLT_ADJ signal is generated from I306 scaler IC Gm5726H (Gm5766H).

3.3 VGA & DDC interface (Circuit diagrams sheet 4 of 8) This sheet has RGB analog video and H/V sync signals input from VGA connector. The RGB analog video signals input through AC-coupled, analog video signal is used to clamp the black level at 0V. And H/V sync to sclaer. Support EDID plug & play function for analog video. It is to support VESA DDC/CI interface for analog video.

3.3.1 P302 connector The RGB analog video and H/V sync input signals to I306 scaler Gm5726H (Gm5766H). The VESA DDC/CI function is through I2C bus to I306 scaler Gm5726H (Gm5766H).

3.3.2 I304 : EDID EEPROM (24LC02B) The I304 is support EDID information of the VESA standard for VGA interface, and support plug and play for the PC host.

3.4 DVI & DDC interface (Circuit diagrams sheet 5 of 8) The digital video signals (TMDS) input from P303 DVI-D connector. The digital video signal is TMDS for DVI V1.0 standard. And support EDID plug & play function for digital video. It is to support VESA DDC/CI interface, and support HDCP function.

3.4.1 P303 connector P303 is DVI-D connector for DDWG standard, it have digital video signals (TMDS) to I306 scaler Gm5726H (Gm5766H). The VESA DDC/CI function is through I2C bus to I306 Gm5726H (Gm5766H). And support HDCP function is also through I2C bus to I306 Gm5726H (Gm5766H).

3.4.2 I305 : EDID EEPROM (24LC02B) The I305 is support EDID information of the VESA standard for DVI interface, and support plug and play for the PC host.

3.5 Scaler Gm5726H (Gm5766H) (Circuit diagrams sheet 6 of 8) The I306 Gm5726H (Gm5766H) is all-in-one LCD monitor controller. The Gm5726H (Gm5766H) leverages Genesis patented advanced image-processing technology as well as a proven integrated ADC/PLL and an Ultra-Reliable DVI compliant receiver to provide excellent image quality. Gm5726H (Gm5766H) also integrates HDCP function, a micro-controller, an OSD controller, and dual LVDS. The RGB analog video signal from video input circuit enter to incorporated A/D converted block (ADC) into the digital data for analog video signal. The TMDS digital signals input (with HDCP) entered from the DVI-D connector is converted into the digital data. Based on this conversion, this device performs interpolation during pixel extension. These interpolation digital data are transformed to LVDS signal. The I306 source voltage is 3.3V and 1.8V, the device clock source frequency is 14.318 MHz. And support DDC/CI interface of VESA and function key operation.

3.5.1 I308 EEPROM (24LC16B)

The control data and parameter, and OSD related setting, and other service data, to be stored in I308. The contents of which are updated as required.

3.5.2 I309 SPI Flash ROM The firmware program running from I309 external SPI flash ROM, contains firmware code and data for all firmware function. The device is 2Mbits of flash ROM.

3.5.3 I307 Microprocessor Supervisory Circuit The function of this device is to assert a reset to I306 scaler Gm5726H (Gm5766H), when either the power supply dropped down.

3.5.4 X301 14.318MHz It generated reference clock input for I306 scaler.

3.5.5 ISP and DDC/CI function The DDC/CI is VESA standard for the host PC system, it can through I2C bus to control LCD monitor. Enter I306 pin64 DDC_SCL_A and pin65 DDC_SDA_A of the VGA port. Enter I306 pin66 DDC_SCL_D pin67 DDC_SDA_D of the DVI-D port. It use ISP function when change new firmware to I309 SPI flash ROM, it used I2C bus from VGA or DVI-D port through I306 Gm5726H (Gm5766H) to I309 SPI flash ROM.

3.5.6 The power save sequence function First I306 pin49 (BKLT_EN) set Low to disable LCD module back light power, delay of some time, then I306 pin127 (PANELVCC_EN) set Low to disable LCD module power, then I306 enter to power down mode.

3.6 Key & Panel interface (Circuit diagrams sheet 7of 8)

3.6.1 P306 connector It is LVDS bus, it is from I306 scaler to LCD panel module. The P306 output voltage is 5V.

3.6.2 P307 and P308 connector The P307/P308 has support keypad function. Control is give effect to for the push switch to be used when the user changes the parameters, in order to modify the respective setting values. Whether the switch has been pressed is identified with the switch input level change of I306 Gm5726H (Gm5766H). Related ports of I306 based on Table 1. Each parameter is stored in the I308 EEPROM, the contents of which are updated as required. The P307 have LED Blue and Amber light, the LED Blue signal from I306 pin126, and the LED Amber signal from I306 pin125.

Table 1 Related ports of I306

Pin No. I/O Signal name Function Remarks Pin 113 I KEY_POWER Soft power switch input Power key Pin 115 I KEY_MENU Enter OSD switch input Enter OSD menu Pin 114 I KEY_UP Switch input Up key or Viewing model selection Pin 115 I KEY_DOWN Switch input Down key or Volume control of

audio function Pin 114 I KEY_SELECT Selection switch input Select key or Auto adjust key

3.7 Audio (Circuit diagrams sheet 8of 8)

3.7.1 P309 connector

The P309 is audio signal input from the audio source.

3.7.2 P310 connector The P310 is audio output to speaker and support 2W x 2 speakers.

3.7.3 I310 TPA6021A4 The I310 is 2x2W stereo audio amplifier, it is an integrated class-AB dual output amplifier.

3.7.4 Q309 : Power down and mute control for Audio ON/OFF control (AUDIO_EN) is performed for standby mode and mute function. It is support 5V to audio IC power. The AUDIO_EN signal is generated from I306 scaler Gm5726H (Gm5766H).

3.7.5 R394, Q310: Volume control for Audio Volume control (volume) is performed for audio output signal power. The volume signal is generated from I306 scaler Gm5726H (Gm5766H).

3.8 Others

3.8.1 Detection of POWER ON status The I306 Gm5726H (Gm5766H) identified the ON status of two modes for the power supplies. The identification is made when the power supply is turn off. For example, if the power supply is turn off with the POWER key switch, the POWER key switch must be turn on when active the power supply again. If the power supply turned off by the pulling out the power cord, then this power supply can to be turned on by connecting the power cord, without pressing the POWER key switch.

3.8.2 Display mode identification

3.8.2.1 Display mode identification The display mode of input signal is identified based on Table 2. When the mode has been identified through the measurement of horizontal

and vertical frequencies, the total number of lines is determined with a formula of “Horizontal frequency / Vertical frequency = Total number of number of lines”. Final identification can be made by examining the coincidence of the obtained figure with the number of lines for the mode identified from the frequency. The Distinction Hsync and Vsync of each mode is shown in Table 3.

When the detected frequency if the sync signal has changed, the total number of lines should be counted even through it is range identified frequency in the same mode.

3.8.2.2 Out of range This out of range mode is assumed when the frequency out of the horizontal / vertical signal is as specified below.

Vertical frequency : 50 ~ 76 Hz. Horizontal frequency : 24 ~ 83KHz.

3.8.2.3 Power save mode

The power save mode is assumed when the horizontal / vertical signals are as specified below.

If there is no horizontal sync signal input. If there is no vertical sync signal input. If the horizontal sync signal is outside the measuring range of I306 Gm5726H

(Gm5766H). If the vertical sync signal is outside the measuring range of I306 Gm5726H

(Gm5766H).

Table 2 video mode

Polarity Mode Resolution H-Freq (KHz) Band Width (MHz)

H V

1 640x480 (59.94Hz) 31.469 25.175 - - 2 640x480 (72Hz) 37.861 31.5 - - 3 640x480 (75Hz) 37.5 31.5 - - 4 720x400 (70Hz) 31.469 28.322 - + 5 800x600 (60Hz) 37.879 40 + + 6 800x600 (72Hz) 48.077 50 + + 7 800x600 (75Hz) 46.875 49.5 + + 8 832x624 (74.55Hz) 49.722 57.284 +/- +/- 9 1024x768 (60Hz) 48.363 65 - -

10 1024x768 (70Hz) 56.476 75 - - 11 1024x768 (75Hz) 60.023 78.75 + + 12 1152x870 (75Hz) 68.68 100 - - 13 1152x900 (76Hz) 71.71 105.561 - - 14 1280x1024 (60Hz) 63.981 108 + + 15 1280x1024 (75Hz) 79.976 135 + +

Table 3 the Hsync, Vsync distinction

Indication resolution Distinction Hsync Distinction Vsync The fixed mode

720 x 400 30.5KHz≦fH≦32.5KHz 69Hz≦fV≦71Hz 4


640 x 480 36.9KHz≦fH≦38.9KHz 71.8Hz≦fV≦73.8Hz 2








1024 x 768 59KHz≦fH≦61KHz 74Hz≦fV 76Hz≦ 11

1152 x 870 67.7KHz fH 69.7KHz≦ ≦ 74Hz fV 76Hz≦ ≦ 12



1280 x 1024 79KHz fH 81KHz≦ ≦ 74Hz fV 76Hz≦ ≦ 15

3.8.3 Power ON sequence

When the POWER key switch is pressed, the POWER key switch signal is turned “H”. When this “H” potential is detected, the CPU begins to establish the respective power

supplies according to the sequence show below.

3.8.4 Power OFF sequence

When the POWER key switch is pressed, while the power supply is ON, the POWER key switch signal is turned “H”. When this “H” potential is detected, the CPU begins to turn off the respective power supplies according to sequence show below.

460ms

157ms

140ms

140ms

Power Key

LED Blue

PANELVCC_EN

BKLT_EN

AUDIO_EN

296ms

Power Key

LED Blue

PANELVCC_EN

BKLT_EN

AUDIO_EN

516ms

825ms

3.68s

3.8.5 List of I/O Pin Assignments of the I306

Pin No. Port Signal Name Initial Setting Function

113 LBADC_IN3 PWR_KEYn H ON/OFF LCD monitor

126 GPIO14 LED_B L LED Blue enable when is H

125 GPIO13 LED_A L LED amber enable when is H

114 LBADC_IN2 KEY_UPn H OSD up/plus enable when is 2.46V

115 LBADC_IN1 KEY_MENUn H OSD enter enable when is 2.46V

114 LBADC_IN2 KEY_SELECTn H OSD select/exit enable when is 2.0V

115 LBADC_IN1 KEY_DOWNn H OSD down/minus enable when is 2.0V

86 GPIO31 HDCP_HPDn L DVI HPD enable when is L

122 GPIO10 SCL H EEPROM clock signal of IIC bus

123 GPIO11 SDA H EEPROM data signal of IIC bus

50 GPO4 BKLT_ADJ - Backlight brightness control

124 GPIO12 DDC_WPn L DDC EEPROM write protection when is L

51 GPO0 AUDIO_EN L Audio enable when is H

56 GPO1 VOLUME L Audio volume

121 GPIO9 VGA_DETn H VGA cable connected when is L

120 GPIO8 DVI_DETn H DVI cable connected when is L

58 GPO3 UART_DO H UART interface data OUT

57 GPO2 UART_DI H UART interface data IN

127 PPWR PANELVCC_EN L Panel power enable when is H

49 PBIAS BKLT_EN L Back light power enable when is H

64 GPIO16 DDC_SCL_VGA H DDC/CI interface for VGA

65 GPIO17 DDC_SDA_VGA H DDC/CI interface for VGA

66 GPIO18 DDC_SCL_DVI H DDC/CI interface for DVI

67 GPIO19 DDC_SDA_DVI H DDC/CI interface for DVI

4. Troubleshooting

Does OSD display when you push MENU

button.

Yes

No Proceed "No OSD display" section.

Check if the sync signal from computer is

output and if the video cable is connected

normally. (VGA or DVI)

OK

Proceed "checking the resolution change IC

movement" section.

NGInput the sync signal of computer, or change

the cable. (VGA or DVI)

When a signal isn't being input, it is

indicated with "VIDEO INPUT". it is

indicated with "OUT OF RANGE" at the

time of the frequency that it can't be

distinguished.

Page 10

4.1 No.display of screen (Screen is black, color of LED is amber)

4.2 Nothing display on screen screen is black, color of LED is blue(

Is backlight light up?

Refer "Checking the backlight unit" section”OK

NG

Does computer output RGB video signals?

(VGA or DVI)

OK

Check OSD menu is display on screen when

you push the "MENU" key.

Proceed "Abnormal sreen" dection"

OK

NG

Check the video cable for failure. Check the host for output signal with all

black only.

1) Change pattern of video signal output on the host.

2) Reconnect the video cable.

3) Change the video cable. (VGA or DVI)

NGCheck if the LCD module signal cable is connected between the I nterface

Board and LCD module.

OK

Next Page

NG

Failure Point

The LVDS cable is disconnected.

Page 11

Continue

Check the 3.3V power are supplied on I302 pin 2, 4.

OK

NGCheck if the voltage on I302 pin 3 that is

power DC at 5V.

OK

Failure Point

I302 is failure.

NG

Failure Point

1) Printed wire broke between P301 pin 5, 6

and I302.

2) FB301, FB302 are open.

3) Check power board.

Check the 1.8V power are supplied on I303 pin 2, 4.

Check if the voltage on I303 pin 3 that is

power DC at 3.3V from the I302.

OK

Failure Point

I303 is failure.

NG

Failure Point

1) Printed wire broke between I302 pin 2, 4

and I303 pin 3.

2) I302 is failure.

OK

NG

Next Page

Page 12

Check the 5V power are supplied on P306

pin 1, 2, 3 (to the LCD panel)

Continue

OK

NGCheck if the Voltage on I301 pin 2 that is

DC power at 5V.

OK

NG

Failure Point

1) Printed wire broke between P301 pin 5,

6, and I301 pin 2.

2) FB301 or FB302 or FB303 is open.

Check if the MOS FET Gate level on I301

pin 1, that Gate level is low.

OK

NG

OK

NG

Failure Point

1) Printed wire broke between Q302

pin 3, R307, R308, C309 and I301 pin

1.

2) Q302 is failure.

Failure Point

1) Printed wire broke between Q302 pin 2

and I306 pin 127.

2) I306 is failure.

Check the PANELVCC_EN signal of the

Q302 pin 2 (with R309) at high level.

Failure Point

I301 is failure.

Check the P306 all LVDS signals.

Failure Point

1) Printed wire broke between P306 and

I306 LVDS signals.

2) I306 is failure.

Failure Point

1) The LVDS cable broke between P306

and LCD module.

2) LCD module is failure.

OK

NG

Page 13

Is +20V supplied to inverter PWB ? (by the

power board)

4.3 Checking the back light unit

OK

NG

Failure Point

1) Inverter cable disconnection.

2) Power board failure.

Check the BACKLIGHT_EN signal of the

P301 pin 2 at high level.

OK

NG

Failure Point

1) printed wire broke between P301 pin 2,

R305 and I306 pin 49.

2) R305 is open, or R306, C308 are short.

3) I306 is failure.

Check the BACKLIGHT_ADJ signal of the

P302 pin 3 from I306 pin 50 is a PWM

signal.

OK

NG

Failure Point

1) printed wire broke between P301 pin 3,

Q301 and I306 pin 50.

2) Q301 is failure.

3) R301 or R302 or R304 is open, or C304

is short.

4) I306 is failure.

Failure Point

Back light unit of LCD module is failure.

Page 14

4.4 Abnormal screen

Check the R, G, B video signal from computer

input on P302 of video connector.

OK

NG Failure Point

1) No R, G, B video signals output from host

computer, check computer.

2) VGA video signal cable disconnection.

Check the R, G, B input video signals on I306 pin

99, 96, 93 respectively that their level is 0.5 to

1.0Vp-p.

Failure Point

In the case of the Red signal. (Green and Blue

signal is the same path, too.)

1) Printed wire broke between P302 pin 1 and

I306 pin 99.

2) Video cable is failure.

3) FB3305, FB306, R313 are open.

4) R313 are short.

5) C317 is short or open.

NG

OK

Check all LVDS signals being output to P306

from I306?

Failure Point

1) Printed wire broke between I306 and P306.

2) LVDS wire failure.

NG

OK

Prpcess "Checking the resolution change IC

movement" section.

4.4.1 Abnormal screen for VGA source

Page 15

Check the H, V SYNC input signals on I306 pin

89, 90 respectively that signal and level.

NG

OK

Failure Point


2) FB311, FB312, R321, R322 are open.

3) R323, R324 if is 2.4K ohm.

4) D305, D306, C327, C328 are short.

5) Video cable is failure.

Check the TMDS signal from computer input on

P303 of DVI-D video connector.

OK

NG Failure Point

1) No TMDS signals output from host computer,

check computer.

2) DVI-D video signal cable disconnection.

Check the TMDS input video signals on I306 pin

72, 73, 75, 76, 80, 81, 83, 84 respectively that

their differential input voltage is 150 to 1200 mV.

Failure Point

In the case of the RX2+/- signal. (A RX1, 0, and

RXC signal is the same path, too.)

1) Printed wire broke between P303 pin 1, 2 and

I306 pin 72, 73.

2) DVI-D video cable is failure.

3) R332, R333 is open.

NG

OK

Check all LVDS signals being output to P306

from I306?

Failure Point


2) LVDS cable failure.

NGOK

Prpcess "Checking the resolution change IC

movement" section.

4.4.2 Abnormal screen for DVI source

Page 16

Check the HP output signal to P303 pin 16

respectively that voltage is 4.0 to 5 V.

NG

OK

Failure Point

The HP is high will to generated TMDS from PC

host.

1) Check P303 pin 14 if is 5V.


Q305.

3) C343, C344 is short.

4) Q305 is failure.

5) DVI-D cable is failure.

6) Printed wire broke between Q305 and I306 pin

86.

7) R361 is open. Q305 is failure.

8) I306 is failure.

4.5 Abnormal OSD display adjust problem

Check the input level whether was changed when pressed

function keys on the P308 pin 2, 3, 4, 5. (normal is 3.3V,

when push button, generated different voltage. pin 2, 4 is

2.46V, pin 3, 5 is 2V)

OK

NG Failure Point

1) Function key wire disconnection.

2) Function key wire is failure.

3) Function key board is failure.

Check the input voltage level whether was changed when

pressed function keys on the I306 pin 114, 115. (normal is

3.3V, when push button, generated 2.46V or 2V.)

OK

NG

Failure Point

1) Printed wire broke between P308 pin 2 and I306 pin 115.




5) C381, C382, R367, R368, C387, C388, C389, C390, C391, C392

is short.

6) R378, R379, R381, R382, R384, R385 is short or open.

7) R380, R383 is open.

Failure Point

I306 is failure.

Page 17

4.6 Abnormal plug and play operation

Confirm the host computer supplies DDC/CI mode.

OK

NG Failure Point

The host machine is not communicated in DDC/CI

mode.

Check the voltage on I304 pin 8 that is DC 5 V.

OK

NGFailure Point

1) Printed wire broke between I304 pinv8, D307 and

P302 pin 9.

2) D307 is failure.

Check the output signal of I2C data / clk on I304 pin 5,

6.

OK

NG Failure Point

I304 is failure.

Check the voltage on P302 pin 9 that is DC 5 V.

OK

NGFailure Point

The VGA video cable is failure.

Check the signals if is high level on P302 pin 12, 15

that is I2C data / clk signal.

OK

NGFailure Point

The VGA video cable is failure.

Failure Point

1) Printed wire broke between I306 pin 65, 64, I304 pin

5, 6 and P302 pin 12, 15.

2) I306 maybe failure.

3) R328, R329 is open.

4) C331, C332, R326, R327 is short.

4.6.1 Abnormal plug and play operation for VGA

Page 18

Confirm the host computer supplies DDC/CI mode.

OK

NG Failure Point

The host machine is not communicated in DDC/CI

mode.

Check the voltage on I305 pin 8 that is DC 5 V.

OK

NGFailure Point

1) Printed wire broke between I305 pin 8, D320 and

P303 pin 14.

2) D320 is failure.

Check the output signal of I2C data / clk on I305 pin 5,

6.

OK

NG Failure Point

I305 is failure.

Check the voltage on P303 pin 14 that is DC 5 V.

OK

NGFailure Point

The DVI-D video cable is failure.

Check the signals if is high on P301 pin 7, 6 that is I2C

data / clk signal.

OK

NGFailure Point

The DVI-D video cable is failure.

Failure Point

1) Printed wire broke between I306 pin 67, 66, I305 pin

5, 6 and P303 pin 7, 6.

2) I306 maybe failure.

3) R346, R347 is open.

4) C346, C347, R324, R343 is short.

4.6.2 Abnormal plug and play operation for DVI

Page 19

4.7 Checking the interface circuit of sync signal

4.7.1 Checking the control circuit of horizontal sync pluse for VGA

Check the horizontal sync signal on P302 pin 13 TTL

level.

OK

NGFailure Point

VGA Video cable is failure.

Check the horizontal sync signal on I306 pin 89 TTL

level.

OK

NG

Failure Point


I306 pin 89.

2) FB311, R321 is open.

3) R324, C328 is short.

Failure Point

Process "Checking the resolution change IC movement"

section.

4.7.2 Checking the control circuit of vertical sync pluse for VGA

Check the vertical sync signal on P302 pin 14 TTL

level.

OK

NGFailure Point

VGA Video cable is failure.

Check the vertical sync signal on I306 pin 90 TTL

level.

OK

NG

Failure Point


I306 pin 90.

2) FB312, R322 is open.

3) R323, C327 is short.

Failure Point

Process "Checking the resolution change IC movement"

section.

Page 20

4.8 Checking the resolution change IC movement

Check +3.3V supply on I306 pin 110, 101, 92, 82, 74, 2, 25,47, 53, 91,

116, 63.

OK

NG Proceed " Checking the DC/DC converter circuit" section.

Check +1.8V supply on I306 pin 118, 87, 55, 17, 78, 70, 104, 106.

OK

NG Proceed " Checking the DC/DC converter circuit" section.

Check X301 14.318MHz clock input to I306 pin 108 and 109.

OK

NGFailure Point

1) Printed wire broke between X301 and I306 pin 108, 109.

2) C362, C373 is short or open.

3) X301 failure.

Check I306 pin 111 RESETn signal is high level at normal operation.

OK

NG

Failure Point

1) Check I307 pin 2 is low level wait 200~250ms to high level, when

VCC5V is turned on.

2) I307 failure.

3) Printed wire broke between I306 pin 111 and I307.

4) C375 is short.

5) R348 is short or open.

6) I311 failure.

Check I306 pin 59~62 SPI ROM interface signal.

OK

NG

Failure Point

1) Printed wire broke between I306 pin 59~62 and I309.

2) I309 failure.

Failure Point

I311 failure.

Page 21

Check I306 pin 50, 51, 56~59, 119 Boot configure, when Reset signal

low to high.

OK

NG

Failure Point

1) Check I306 pin 50, if is low. R358 is open or short.





6) Check I306 pin 59, if is high. R363 is open or short.

7) Check I306 pin 119, if is high. R351 is open or short.

Check the audio signal input from the audio

source.

OK

NG

Failure Point

1) No audio signal from the audio source.

2) Audio cable is failure.

Check audio signal input of the I310 TPA6021A4

pin 4, 5, 7, 8.

Failure Point

1) Printed wire broke between P309 and I310 pin 4, 5,

7, 8.

2) FB318, FB319, R386, R387, C393, C394, C397,

C398 is open.

3) C395, C396, R388, R389 is short.

NG

OK

Check I310 audio power +5V.

Failure Point

1) Power board have no output 5V on P301 pin 7, 8.

2) Power board is failure.

3) Printed wire broke between P301 pin 7, 8 and I310

pin 3, 6, 9.

4) FB321 is open.

5) C301~C303, C401~C404 is short.

6) FB320, FB322 is open.

NG

OK

4.9 Audio No Signal Output

Next Page

Page 22

Check audio speaker is working.

OK

NGFailure Point

1) Audio output wire is disconnected from the interface

board P310 to key function board P601.

2) Printed wire broke between P600 and P601 and P602

for the key function board.

3) Audio speaker unit is disconnected from the P601

and P602.

Failure Point

Audio speaker unit "L" or "R" is failure.

Check I310 pin 14 SHOUTDOWNn if is low

level.

NG

OK

Failure Point

1) Printed wire broke between I306 pin 51 and Q309

and I310 pin 14.

2) R392, R390, R391 is open or short.

3) C400 is short.

4) Q309 is filure.

5) I306 is failure.

Continue

Check I310 pin 10, 12, 20, 2 audio signal output.

NG

OK

Failure Point

1) Printed wire broke between I310 pin10, 12, 20, 2 and

P310 pin 1, 2, 3, 4.

2) I316 is failure.

Page 23

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