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4 Troubleshooting

4 Troubleshooting
4-1 First Checklist for Troubleshooting
1. Check the various cable connections first. - Check to see if there is a burnt or damaged cable. - Check to see if there is a disconnected cable connection or a connection is too loose. - Check to see if the cables are connected according to the connection diagram. 2. Check the power input to the Main Board. 3. Check the voltage in and out between the SMPS Main Board, between the SMPS

INVERTER Board, and between the Main LVDS Boards.

4-1

4 Troubleshooting

4-2 Checkpoints by Error Mode 4-2-1 No Power
LAMP off, power indicator LED red color? No Check a connection a power cable.

Yes

Does proper DC 12V appear at CM801?

No Change a Assy PCB Power.

Yes Does proper DC A3.3V, A5V appear at C854, C866?

No

Check a IC809, IC802. Change a main PCB ass'y.

Yes Does proper DC 5V, 3.3V, 1.9V appear at C811, C853, C833?

No

Check a IC811, IC812, IC813, IC606, IC818. Change a main PCB ass'y

Yes

A power is supplied to set?

No

Check a other function. (No picture part) Replace a lcd panel.

4-2

4 Troubleshooting

4-2-2 No Video (Analog PC)

Power Indicator is off. Lamp on, no video. Yes Check a PC source and check the connection of DSUB cable? Yes Does the signal appear at #30, 22, 38(R, G, B) of IC500? Yes Does the digital data appear at the output of LVDS (R563~572)? Yes Check a LVDS cable? Replace a lcd panel? No Please, Call to Samsung Co. LTD. No No No

Input a analog PC signal and connected cable(DPMS).

1

PC cable. Change a PC cable. Change a main PCB ass'y.

Check a IC500 Change a main PCB ass'y.

4-3

4 Troubleshooting

WAVEFORMS
1 R,G,B Output Signal of IC500

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4 Troubleshooting

4-2-3 No Video (Digital-HDMI)

Power Indicator is off. Lamp on, no video. Yes Check the connection of HDMI cable? Yes Does the digital data appear at 3 R503~R510? Yes
2 Does the digital data appear at output of IC500 LVDS(R563~572)?

No Input a HDMI cable.

No

Check a a IC 500 Change a main PCB ass'y.

No

Check a IC500 Change a main PCB ass'y.

Yes Check a LVDS cable? Replace lcd panel? No Please, Call to Samsung Co. LTD.

4-5

4 Troubleshooting 2 Digital Output Data of IC500 3 Signal of HDMI(Data)

4-6

4 Troubleshooting

4-2-4 No Picture (Tuner_CVBS)

Power Indicator is off. Lamp on, no picure. Yes Dose the signal appear at R110? Yes Does the signal appear at #8 of IC500? Yes Does the digital data appear at output of R563~R572? Yes Check a LVDS cable? Replacea lcd panel?

No

Connect the RF cable and check RF signal.

4

No

Check a B+ voltage (#7 of Tuner) 5V, change a main PCB ass'y

4

No Change a main PCB ass'y.

3

No

Check a IC500. Change a main PCB ass'y.

No Please, Call to Samsung Co. LTD.

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4 Troubleshooting

WAVEFORMS
3 CVBS Output Signal 4 Tuner_CVBS Output Signal

4-8

4 Troubleshooting

4-2-5 No Picture (Video_CVBS)

Power Indicator is off. Lamp on, no picture. Yes Dose the signal appear at #10 of IC500? Yes Does the signal appear at Out of IC500 R563~R572? Yes Check a LVDS cable? Replace lcd panel?

No Check a A/V cable and video signal.

4

No Check a connection harness.

No

Check a IC515. Change a main PCB ass'y

No Please, Call to Samsung Co. LTD.

4-9

4 Troubleshooting

WAVEFORMS
4 CVBS Output Signal

4-10

4 Troubleshooting

4-2-6 No Picture (S-VIDEO_Y,C)

Power Indicator is off. Lamp on, no picure. Yes
5 Dose the Y/C signal appear at

No

Connect the s-video cable. Operating a video player.

No Check a connection harness.

#21, #31 of IC500? Yes
2 Does the digital data appear at

No

Output of IC500, R563~R572? Yes Check a LVDS cable? Replacea lcd panel? No

Check a IC500. Change a main PCB ass'y.

Please, Call to Samsung Co. LTD.

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4 Troubleshooting

WAVEFORMS
2 Digital Output Data of IC500 5 Analog Signal(Y,C) to IC500

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4 Troubleshooting

4-2-7 No Sound
No Picture is display, no sound. Connect a sound cable. control a volume.

Yes Does the signal appear at Pin #10, #16(CH1_L, R Sound) and Pin #3, #9 6 (CH2_L, R Sound) of IC603?

No

Check a connection harness and headphone jack / Side AV.

Yes

Check the DC 12V of IC603?

No

Check a IC603. Change a main PCB ass'y.

Yes

7 Does the signal appear at

No Change a main PCB ass'y.

L700, L701, L702, L703?

Yes

Replace the speaker ass'y?

4-13

4 Troubleshooting

WAVEFORMS
6 The Signal are Inputed to IC603 7 DC +12V

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