Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV 225MW chassis LCR22AS 225MW[9]

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4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC's display as below.
- Resolution: 1680 x 1050
- H-frequency: 65.290 kHz
- V-frequency: 59.954 Hz
2. If no picture appears, make sure the power cord is correctly connected.
3. Check the following circuits.
- No raster appears: Function PBA, Main PBA, IP Board
- 5V develop but no screen: Main PBA
- 13V, 5V does not develop: IP Board, Main PBA

4-1 No Power

Check Function ass'y.

Does proper 13V appear at No
pin No. 5,6,7 of CN600? 1 Check IP Board

Yes

No
Dose proper 13V appear at Check related circuit of CN600
C618? 1

Yes

No
Does proper 5V appear at pin Check related circuit of IC110
No.1 of IC110? 2

Yes

No
Does proper 1.8V appear at pin Check related circuit of IC109
No. 1 of IC109? 3

Yes

Change main board for
MICOM(IC300) problem

4-1
4 Troubleshooting

CN600

C618

IC110
IC300

IC109

WAVEFORMS

1 2

4-2
4 Troubleshooting

4-2 No Video (ANALOG)

Does led persists green No
Check IP board
light after power on?

Yes

Does proper 5V appear at No
Check D-sub cable connection.
pin No. 9 of CN101?

Yes
4 5
No
Does proper V and H-sync appear Check PC state.
at C102 and C101?

Yes

Does proper clock signals appear at No Change main board
pin NO.11,12,23,24 of CN400? because of scaler problem.

Yes
Check connection between main
board and panel.
Change Panel.

CN400

C101, C102

CN101

4-3
4 Troubleshooting

WAVEFORMS

4 5

4-4
4 Troubleshooting

4-3 No Video (DIGITAL)

Does led persists green No
Check IP board
light after power on?

Yes

Dose proper 5V appear at No
Check DVI cable connection
pin No. 14 of CN102?

Yes

Does proper signals appear at No
pin No.6(SCL) and No.7(SDA) Check PC state.
6 of CN102? 7

Yes

Does proper clock signals No
appear at pin NO.6 Change IC203.
and NO.7 of IC203?

Yes

Does proper clock signals No Change main board
appear at pin NO.11,12,23,24
because of scaler problem.
of CN400?

Yes

Check connection between main
board and panel.
Change Panel.

4-5
4 Troubleshooting

CN400

IC203

CN102

WAVEFORMS

6 7

4-6
4 Troubleshooting

4-4 No Video (HDMI)

Does led persists green No
Check IP board.
light after power on?

Yes

Dose proper 5V appear at No
Check HDMI cable connection.
pin No. 18 of CN103?

Yes

Does proper signals appear at No
pin No.15(SCL) and No.16(SDA) Change IC302.
8 of CN103? 9

Yes

Does proper clock signals No
appear at pin NO.6 Change IC203.
and NO.7 of IC203?

Yes

Does proper clock signals No Change main board
appear at pin NO.11,12,23,24 of
because of scaler problem.
CN400?

Yes

Check connection between main
board and panel.
Change Panel.

4-7
4 Troubleshooting

CN400

IC302

IC203

CN103

WAVEFORMS

8 9

4-8
4 Troubleshooting

4-5 No Sound

Does a signal appear at No
Pin 2and 19 of CN801? Check CN801 and related circuit.

Yes

Does a sound output signal a No
ppear at Check CN801 and related circuit.
Pin 2 and 19 of CN801?

Yes

Does a sound processor No
output signal a ppear at Check CN802 and related circuit.
Pin 20 and 21of CN802?

Yes

Does a signal appear at
each PIN of CN120, CN190, No Check Sound input jack and related
CN170 of sound source? circuit.

Yes

Replace Main board
(Perform Automatic Color Adjustment)

4-9
4 Troubleshooting

Memo

4-10

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