Page 1
5 Troubleshooting
5-1 No Power
CONFIDENTIAL
Does proper DC 14 V appear at
DC jack connected to CN800?
Yes
Does proper DC 5 V appear at
Pin 2 of IC815 and IC816?
Yes
Does proper DC 5 V appear at
Pin 2 of IC810?
Yes
Does proper DC 2.5 V appear at
Pin 2 of IC804 and IC806?
No
No
No
No
Check SMPS PCB and Adapter.
Check IC815 and IC 816
Check IC810.
Check IC804 and IC806
.
Yes
Does proper DC 3.3 V appear at
Pin 2 of IC800, IC801 and IC805?
Yes
Check IC811 and IC817.
No
Check IC800, IC801 and IC805.
RS21N*/RS24N* 5-1
Page 2
5 Troubleshooting
5-2 No Video (PC Analog Signal)
Power indicator is green
CONFIDENTIAL
Does the signal appear at Pin 7,
15 and 22 of IC203, IC206?
Yes
Does the clock pulse appear at
Pin 115 and 117 of IC203?
Yes
Does the colck pluse
appear at Pin 8 of IC207?
Yes
Replace LCD Panel.
No
No
No
Check R226, R228, R229,
C237, C238, C239, R246, R247,
R249, C258, C260, C262.
Check IC203 and related circuit of IC203.
Check related circuit of IC207.
5-2 RS21N*/RS24N*
Page 3
5 Troubleshooting
5-3 No Picture (CVBS, S-VHS)
CONFIDENTIAL
Check Pin 6 (+33V_TUNER)
of CN301.
Yes
Check Pin 8 (RF_CVBS) of CN301.
Yes
Check IC301 (VPC3230D).
Yes
IC308 and IC309 and replace it.
No
Check CN301 and related circuit of IC303.
No
No
Replace Tuner.
Check related circuit of IC301
and replace IC301.
RS21N*/RS24N* 5-3
Page 4
5 Troubleshooting
5-4 No Sound
CONFIDENTIAL
Does the Low signal at
Pin 9 and of IC106?
Yes
Check Pin 1 and 5 of IC106?
Yes
Check Pin 67 of
IC108 (MSP3451)?
Yes
Check CN301 and tuner and
related circuit of CN301 and tuner.
No
Check Pin 4 and 6 of CN112.
No
Replace IC106.
No
Replace IC108 (MSP3451).
5-4 RS21N*/RS24N*
Page 5
5 Troubleshooting
5-5 No Picture (DTV [NTSC only])
Power inductor is green.
Yes
CONFIDENTIAL
Does the signal appear at
Pin 43, 48, 54 of IC104?
Yes
Dose the signal appear at Pin 65,
66, 67, 68 of IC104?
Yes
Replace LCD Panel.
No
Check IC103 and the velated circuit.
No
Check IC104 and related circuit of IC104.
RS21N*/RS24N* 5-5
Page 6
5 Troubleshooting
Memo
CONFIDENTIAL
5-6 RS21N*/RS24N*
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