Read Sharp LL-T1820 (serv.man5) Service Manual online
PC-UM10M
LL-T1820-H/B TROUBLE SHOOTING
4 – 4
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GAIN CONTROL and WHITE BALANCE
are set properly?
are set properly?
Analog color signal output (C302, C304,
C306, C317, C320, and C322) is normal?
C306, C317, C320, and C322) is normal?
Digital color signal output of IC401(ID0
ID47) is normal?
ID47) is normal?
Digital color signal output of IC501 (OD0
OD47) is normal?
OD47) is normal?
Check circuits around IC701, and CN700
and LCD module.
and LCD module.
Check circuits around IC401, IC403, and
IC601.
IC601.
Digital color signal output of IC401 (ID0
ID47) is normal?
ID47) is normal?
Press INPUT key to switch over to the
correct input signal port.
correct input signal port.
Check CN100 and 200, and signal source
and digital signal cable.
and digital signal cable.
Check circuits around IC100, IC102, IC103,
IC200, and IC201.
IC200, and IC201.
Check CN100 and 200, and signal source
and digital signal cable.
and digital signal cable.
Display is normal in composite sync and sync-
on-green signal input.
on-green signal input.
AUTO function of GAIN CONTROL operates
properly?
properly?
Input signal port is the one to which digital
signal cable is connected?
signal cable is connected?
Waveforms of IC103s and 201s 5th and 6th
pins change normally when resolution is
changed?
pins change normally when resolution is
changed?
Test terminals LD100, LD101, LD200, LD201,
LD202, LD203, LD204, LD205 are DC+3.3V?
LD202, LD203, LD204, LD205 are DC+3.3V?
CN100 and 200 signals (at 1st, 2nd, 9th, 10th,
17th, 18th, 23rd, and 24th pins) are normal?
17th, 18th, 23rd, and 24th pins) are normal?
IC101 and IC203 signal output (ID0 ID47,
HIS, IVS,ICK, IACT) are normal?
HIS, IVS,ICK, IACT) are normal?
LCD screen color is abnormal?
Input is changed over properly?
No error.
Display is normal in analog input?
TP100 and 200 are in H level (DV+5V)?
Check circuits around IC501.
Adjust according to "screen adjustment
procedure".
procedure".
Check circuits around IC401.
Check circuits around IC401 and IC501.
Check circuits around IC501 and IC701.
Check circuits around IC401 and IC403.
Check circuits around IC601.
check circuits around IC601 and IC604.
Check circuits around IC401.
First, check with analog signal input.
Check circuits around IC400.
Check circuits around IC101 and IC203.
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