Read Sharp LL-T1820 (serv.man5) Service Manual online
PC-UM10M
LL-T1820-H/B TROUBLE SHOOTING
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Check DC+5V power supply line (AV5) ,
POWER_CTL1 signal, and circuits around
Q808.
POWER_CTL1 signal, and circuits around
Q808.
Check DC+5V power supply line (PV5) ,
POWER_CTL3 signal, and circuits around
Q800.
POWER_CTL3 signal, and circuits around
Q800.
Check the power supply unit and cable and
their connections, and POWER_CTL1
their connections, and POWER_CTL1
Check DC+2.5V power supply line (DV25),
POWER_CTL1 signal, and circuits around
IC800.
POWER_CTL1 signal, and circuits around
IC800.
Check DC+12V power supply line (LCDV),
POWER_CTL2 signal, and circuits around
Q800.
POWER_CTL2 signal, and circuits around
Q800.
Check OSC500 and clock circuit around
IC502.
IC502.
Clock (R517) and DE (R515) signal outputs
are normal?
are normal?
ADJUSTMENT and MODE SELECT are set
properly?
properly?
Signal waveform of test terminal LD510 is
normal?
normal?
ADJUSTMENT and MODE SELECT are set
properly?
properly?
Adjust according to "screen adjustment
procedure".
procedure".
Adjust according to "screen adjustment
procedure".
procedure".
Check circuits around IC300, IC301, and
IC401.
IC401.
Check circuits around IC701, and CN700
and LCD module.
and LCD module.
Check DC+5V power supply line (DV5A),
POWER_CTL1 signal, and circuits around
Q808.
POWER_CTL1 signal, and circuits around
Q808.
Test terminals LD419, LD515, and LD700 are
DC+3.3V?
DC+3.3V?
Signal waveform of test terminal LD500 is
normal?
normal?
Test terminals LD416, LD417, and LD418 are
DC+3.3V?
DC+3.3V?
8th pin of Q808 is DC+5V?
Test terminal LD809 is DC+5V?
Test terminal LD810 is DC+5V?
Test terminal LD807 is DC+12V?
Test terminal LD509 is DC+2.5V?
TP801 is DC+12.0V?
36th pin of LC601 is in H level (DC+5V)?
The entire LCD screen is white?
The entire LCD is black?
The size of LCD screen is abnormal?
LCD screen jitters or flickers?
Check circuits around IC400.
Check circuits around IC402.
Check circuits around IC601.
Test terminal of LD701 is DC+12V?
Check circuits around X600 and IC601.
Check circuits around IC501.
Check circuits around CN700.
Check circuits around IC401.
Check circuits around IC501.
4
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