Sharp LL-T2020, Service Manual

Page: 18 / 33

LL-T2020 TROUBLESHOOTING
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GAIN CONTROL and WHITE BALANCE
are set properly?
Analog color signal output (C302, C303,
C305, C319, C320, and C322) is normal?
Digital color signal output of IC402 (ID0
ID47) is normal?
Digital color signal output of IC502 (OD0
OD47) is normal?
Check circuits around IC701, and CN701
and LCD module.
Check circuits around IC402, IC404, and
IC602.
Digital color signal output of IC402 (ID0
ID47) is normal?
Press INPUT key to switch over to the
correct input signal port.
Check CN101 and 201, and signal source
and digital signal cable.
Check circuits around IC101, IC103 and
IC201.
Check CN101 and 201, and signal source
and digital signal cable.
Display is normal in composite sync and sync-
on-green signal input.
Adjustment settings are stored after display
screen is adjusted?
AUTO function of GAIN CONTROL operates
properly?
Input signal port is the one to which digital
signal cable is connected?
Waveforms of IC103s and 201s 1st and 2nd
pins change normally when resolution is
changed?
Test terminals LD110, LD111, LD112, LD113,
LD210, LD211, LD212, LD213 are DC+3.3V?
CN101 and 201 signals (at 1st, 2nd, 9th, 10th,
17th, 18th, 23rd, and 24th pins) are normal?
IC102 and IC202 signal output (ID0 ID47,
HIS, IVS, ICK, IACT) are normal?
LCD screen color is abnormal?
Input is changed over properly?
No error.
Display is normal in analog input?
LD101 and LD201 are in H level (DC+5V)?
Check circuits around IC502.
Adjust according to "screen adjustment
procedure".
Check circuits around IC402.
Check circuits around IC402 and IC502.
Check circuits around IC502 and IC701.
Check circuits around IC402 and IC404.
Check circuits around IC602.
check circuits around IC602 and IC605.
Check circuits around IC402.
First, check with analog signal input.
Check circuits around IC104 and IC203.
Check circuits around IC102 and IC202.
continued from 4
The display does not work. (with digital connection, DVI-D cable use)