TROUBLE SHOOTING TABLE (Continued)
Data dropout (relating to gray scale) Set PATTERN1 � PATTERN1 on the adjustment process menu to "2". Is the gray scale pattern displayed correctly?
YES Set PATTERN1 � PATTERN3 on the adjustment process menu to "1". Is the gray scale pattern displayed correctly? YES Set PATTERN1 � PATTERN3 on the adjustment process menu to "4". Is the test pattern displayed correctly at intervals of one dot? YES Set PATTERN1 � PATTERN3 on the adjustment process menu to "5". Is the test pattern displayed correctly at intervals of one dot? YES Check the peripheral circuits of IC4602. NO
Check the connection between SC4651 and SC4652 and check the peripheral circuits of IC4501. Check IC4702, IC4902 and their peripheral circuits.
NO
NO
Check the line between IC4701 and IC4501.
NO
Check the line between IC4901 and IC4501.
Noise is caused to the moving picture with the QS drive on. Is OSTEMP.AD on Page 1 of the process adjustment mode set at 255? YES Is the harness connected correctly between the inverter GND PWB and LCD control PWB?
YES NO
Check IC4701 and IC4901 and their peripheral circuits.
NO
Connect the harness correctly or replace it.
Is the input voltage at pin (62) of IC2004 (microprocessor) 5V?
YES The thermistor on the inverter GND PWB is faulty.
NO
Pin (62) of IC2004 (microprocessor) is faulty.
The backlight does not go on. Is any of the fuses in the power supply unit blown?
NO YES
Check the inverter circuit located downstream from the blown
Check the connector and inverter circuit of each fluorescent lamp.
YES Is the control signal applied to P7705 of LCD Control PWB? NO YES
Is power supplied to the inverter PWB?
NO Is the harness connected correctly between the PWBs (power unit, inverter PWB, inverter GND PWB and LCD control PWB)? NO Connect the harness correctly or replace it.
YES
Check the peripheral circuits of IC4501.
The whole screen is whitish (LCD power supply). Set PATTERN1 � PATTERN3 on the adjustment process menu to "1". Is the gray scale pattern displayed correctly?
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). YES
