Sharp AQUOS LC-26GA5H, Service Manual

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36
LC-26GA5H/M/X
TROUBLE SHOOTING TABLE
(Continued)
YES
YES
NO
YES
NO
NO
NO
YES
YES
NO
YES
YES
NO
250ms 1sec
No video and audio output
Is the power LED on in green?
Power LED flash timing chart in case of error
Is the power LED on in red?
Check the power circuit.
Does the LED flash at regular intervals?
Does the LED flash just once?
Does the LED flash twice?
Does the LED flash 5 times?
Is the backlight off?
Go to "Backlight failure".
Go to "No video output".
Type of error
Power error
One flash: Slow H: ON
L: OFF
H: ON
L: OFF
H: ON
L: OFF
H: ON
L: OFF
Lamp error
One flash: Quick
Panel power error (VSH)
Two flashes
Temperature error
Five flashes
Power LED behavior (one cycle)
Go to "Backlight failure".
Check the panel power detector (VSH).
Check the set's temperature.
Check the power circuit. The CCKM and D5V
lines are okay.
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Data bit dropout (gradation-related)
Video noise onscreen with QS drive on
Call the adjustment process menu, select PATTERN 1 and set
"2" to PATTERN 1. Is the gradation pattern as specified?
Call the adjustment process menu, select PATTERN 1 and set
"2" to PATTERN 3. Is the gradation pattern as specified?
Is the TEMP.AD on Page 1 of adjustment process mode set at
255?
Are the inverter GND PWB and LCD control PWB interconnected
properly with harness?
Is the input voltage at pin (62) of microprocessor IC2004 at 5V?
Thermistor on inverter GND PWB defective.
Call the adjustment process menu, select PATTERN 1 and set
"5" to PATTERN 3. Is the test pattern dot by dot as specified?
Call the adjustment process menu, select PATTERN 1 and set
"4" to PATTERN 3. Is the test pattern dot by dot as specified?
Check the connection between SC4651 and SC4652, as well as
IC4501 and its peripheral circuits.
Check IC4901 and its peripheral circuits.
Reconnect them properly or replace the harness.
Pin (62) of microprocessor IC2004 defective.
Check IC4902 and its peripheral circuits.
Check the line between IC4901 and IC4501.
Check IC4601 and its peripheral circuits.
Check the line between IC4901 and IC4501.
NO
NO
YES
No video output
Is there the clock output at pin (40) of IC4501?
Is the adjustment process menu displayed? Check IC4601 and its peripheral circuits.
Check IC4901 and its peripheral circuits.
Check the FFC line (LV SC3200, SC4601) between main unit and
LCD control unit.