Page 1
SyncMaster 210T/240T 5-1
5 Troubleshooting
5-1 No Power
Does proper DC 12 V appear at
DC jack connected to CN801?
Check SMPS PCB and Adapter.
Yes
No
Does proper DC 5 V appear at
Pin 3 of CN802?
Check DC/DC converter.
Check IC802 and IC807.
Yes
No
Does proper DC 2.5 V appear at
Pin 2 of IC804 and IC805?
Check C804 and IC805
.
Yes
No
Does proper DC 3.3 V appear at
Pin 2 of IC801 and Pin 1 of IC810?
Check C804 and IC805
.
Yes
No
Does proper DC 5 V appear at
Pin 2 of CN809?
Check IC809.
Yes
No
Page 2
5 Troubleshooting
5-2 SyncMaster 210T/240T
5-2 No Video (PC Anolog Signal)
Power indicator is green
Does the signal appear at Pin 7,
15 and 22 of IC204, IC206?
Check R901~R903, C241~C243,
R904~906, C266,C267, and C269.
Yes
No
Does the clock pulse appear at
Pin 115 and 117 of IC204?
Check IC204 and related circuit of IC204.
Yes
No
Does the clock pulse appear at
output of R551?
Check related circuit of IC502.
Yes
No
Does the clock pulse appear at
Pin 54~56 of IC700?
Check IC602 and related circuit of IC602.
Yes
No
Replace LCD Panel.
Does the clock pulse appear at
Pin 28~50 of IC700?
Yes
Page 3
5 Troubleshooting
SyncMaster 210T/240T 5-3
5-3 No Video (PC Digital Signal)
Does thr digital video signal
appear at R103~108,
R111 and R112?
Check PC and related circuit.
Yes
No
Do the clock appear at RA113?
Check IC103 and related circuit.
Yes
No
Replace IC502 and IC602
and replace main board.
5-4 No Picture (CUBS, S-VHS)
Check IC301 (VPC3230D)
Check related circuit of IC301 and
replace IC301.
Yes
No
Check IC502 and IC602
and replace mainboard.
Check IC301 (SDA9400)
Check related circuit of IC301 and
replace IC301.
Yes
No
Page 4
Memo
5 Troubleshooting
5-4 SyncMaster 210T/240T
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