Troubleshooting Table (continued)
No picture in the LCD section
Is the power supplied to the LCD CONTROLLER PWB? (P7707: +6/+4/+13V) Check if the REG output -D3.3V_1/2 of IC7706/IC7704 (REG-IC) is sent properly.
YES
Is the output signal of IC4601 (GAMMA) sent properly?
NO
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN1" in the second llayer of "LCD CONT" to "02"?
Check the FFC (LV, SC2201 - SC4601) between MAIN PWB and LCD CONTROLLER PWB and input circuit of IC4601. Check IC4501 (LCD CONTROL) and its peripheral circuits.
NO
YES
Check IC4901 (QS-DRIVER) and its peripheral circuits.
Data bit drop (gradation-related)
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN1" in the second layer of "LCD CONT" to "02"?
NO
Check the connection between SC4651 and SC4652 and peripheral circuits of IC4501 (LCD CONTROL).
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN2" in the second layer of "LCD CONT" to "1"?
NO
Check IC4902 (FIFO) and its peripheral circuits.
YES
Check IC4601 (GAMMA) and its peripheral circuits.
Noise is caused to the moving picture with the QS drive on.
Is the input voltage at pin (62) (OS-TEMP) of IC2004 (microprocessor) 5V?
NO
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
Is the harness connected correctly between the inverter GND PWB and LCD CONTROLLER PWB?
NO
Connect the harness correctly or replace it.
YES
The thermistor on the INVERTER GND PWB is faulty. Or check the peripheral circuits.
The whole screen is whitish (LCD power supply).
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN2" in the second layer of "LCD CONT" to "1"? (Is it whitish or dark?) Check the video signal circuits (IC4501, IC4901, IC4601).
NO
Disconnect the FPC from SC4651 and SC4652. (To protect the panel against damage)
YES
Check the power supply voltage supplied to the panel (check at SC4651 and SC4652).
