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.
4-2 Checkpoints by Error Mode 4-2-1 No Power
LAMP off, power indicator LED blue color? No Check a connection a power cable.
Does proper DC 12V appear at CM801?
No Change a Assy PCB Power.
Yes Does proper DC A3.3V, A5V appear at C1059, C1167?
Check a IC1008, IC1004. Change a main PCB ass'y.
Yes Does proper DC5V, 3.3V, 1.8V appear at C1015, C1194, C1109?
Check a IC1018, IC1011, IC1002. Change a main PCB ass'y
A power is supplied to set?
Check a other function. (No picture part) Replace a lcd panel.
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 IC4001? Yes Does the digital data appear at the input of LBE (RA4016~18)? Yes Does the digital data appear at the output of IC4003 (RA4014,15_1CH, R4132,33_1CH)? Yes Check a LVDS cable? Replace a lcd panel? No Please, Call to Samsung Co. LTD. No No No No
Input a analog PC signal and connected cable(DPMS).
PC cable. Change a PC cable. Change a main PCB ass'y.
Check IC4001 Change a main PCB ass'y.
Check IC4003 Change a main PCB ass'y.

WAVEFORMS

1 R,G,B Output Signal of IC500
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 R4004~R4011? Yes
2 Does the digital data appear at output of IC4001 LVDS(RA4016~18)?

No Input a HDMI cable.

Check a a IC 4001 Change a main PCB ass'y.
Check a IC4001 Change a main PCB ass'y.
Yes Does the digital data appear at the output of IC4003 (RA4014,15_1CH, R4132,33_1CH)? Yes Check a LVDS cable? Replace a lcd panel? No Please, Call to Samsung Co. LTD. No
4 Troubleshooting 2 Digital Output Data of ICSignal of HDMI(Data)
4-2-4 No Picture (Tuner_CVBS)
Power Indicator is off. Lamp on, no picure. Yes Dose the signal appear at R5118_RDY? Yes Does the signal appear at #8 of IC4001? Yes Does the digital data appear at output of RA4016~18? Yes Does the digital data appear at the output of IC4003 (RA4014,15_1CH, R4132,33_1CH)? Yes Check a LVDS cable? Replace a lcd panel?
Connect the RF cable and check RF signal.
Check a B+ voltage (#7 of Tuner) 5V, change a main PCB ass'y
No Change a main PCB ass'y.
Check a IC4001. Change a main PCB ass'y.
No Please, Call to Samsung Co. LTD.
3 CVBS Output Signal 4 Tuner_CVBS Output Signal
4-2-5 No Picture (Video_CVBS)
Power Indicator is off. Lamp on, no picture. Yes Dose the signal appear at #10 of IC4001? Yes Does the signal appear at Out of IC4001, RA4016~18? Yes Does the digital data appear at the output of IC4003 (RA4014,15_1CH, R4132,33_1CH)? Yes Check a LVDS cable? Replace a lcd panel?
No Check a A/V cable and video signal.
No Check a connection harness.
Check a IC515. Change a main PCB ass'y

4 CVBS Output Signal

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
Connect the s-video cable. Operating a video player.
#21, #31 of IC4001? Yes Does the digital data appear 2 at Output of IC4001, RA4016~18? Yes Does the digital data appear at the output of IC4003 (RA4014,15_1CH, R4132,33_1CH)? Yes Check a LVDS cable? Replace a lcd panel? No No No
Please, Call to Samsung Co. LTD.
2 Digital Output Data of ICAnalog Signal(Y,C) to IC500

4-2-7 No Sound

No Picture is display, no sound. Connect a sound cable. control a volume.
Does the signal appear at Pin #10, #16(CH1_L, R Sound) and Pin #3, #(CH2_L, R Sound) of IC1015?
Check a connection harness and headphone jack / Side AV.

Check the DC 12V of IC1015?
Check a IC1015. Change a main PCB ass'y.
7 Does the signal appear at
L1014, L1015, L1018, L1019?
Replace the speaker ass'y?
6 The Signal are Inputed to ICDC +12V