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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 No
Check a connection a power cable.
LED red color?


Yes



Does proper DC 12V, DC 5V No
Change a Assy PCB Power.
appear at CN101?



Yes


Does proper DC A3.3V, No Check a IC104, Q104.
A5V appear at
Change a main PCB ass'y.
C126, C127?


Yes


Does proper DC 12V, 9V, 3.3V, No Check a IC102_CPT, IC101, IC105,
2.5V, 1.8V appear at C109, IC106, IC109.
C105, C132, C145, C159 ? Change a main PCB ass'y


Yes


No Check a other function.
A power is supplied to set? (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 No Input a analog PC signal and
the connection of DSUB cable? connected cable(DPMS).


Yes


Does the signal appear at C313, No PC cable. Change a PC
1
C316, C320 near IC602? cable. Change a main PCB ass'y.


Yes

Does the digital data appear No Check a IC602
at the output of
Change a main PCB ass'y.
LVDS (R716, 717, 719~726)?

Yes


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




4-3
4 Troubleshooting


WAVEFORMS

1 R,G,B Output Signal of IC602




4-4
4 Troubleshooting

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



Power Indicator is off.
Lamp on, no video.

Yes


Check the connection No
Input a HDMI cable.
of HDMI cable?


Yes


Does the digital data appear at No Check a a IC602
3 R738~R745? Change a main PCB ass'y.


Yes

2 Does the digital data No
appear at output of IC602 Check a IC602
LVDS(R716, 717, 719~726)? Change a main PCB ass'y.


Yes


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




4-5
4 Troubleshooting


2 Digital Output Data of IC602 3 Signal of HDMI(Data)




4-6
4 Troubleshooting

4-2-4 No Picture (Tuner_CVBS)



Power Indicator is off. No Connect the RF cable and
Lamp on, no picure. check RF signal.

Yes


Dose the signal appear No Check a B+ voltage (#6 of Tuner) 5V,
4
at R126? change a main PCB ass'y


Yes


Does the signal appear at No
4 Change a main PCB ass'y.
C611 near IC602?


Yes

Does the digital data appear No
3 at output of Check a IC602.
R716, 717, 719~726? Change a main PCB ass'y.


Yes


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




4-7
4 Troubleshooting


3 CVBS Output Signal 4 Tuner_CVBS Output Signal




4-8
4 Troubleshooting

4-2-5 No Picture (Video_CVBS)



Power Indicator is off. No
Check a A/V cable and video signal.
Lamp on, no picture.

Yes


Does the signal appear at No
4 Check a connection harness.
C614 near IC602?


Yes

Does the signal appear at No
Out of IC602 Check a IC602.
R716, 717, 719~726? Change a main PCB ass'y


Yes


Check a LVDS cable? No
Replace lcd panel? 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. No Connect the s-video cable.
Lamp on, no picure. Operating a video player.
Yes

5 Does the signal appear at No
C612,C613 near IC602? Check a connection harness.


Yes

Does the digital data appear
2 No Check a IC602.
at Output of IC602,
R716, 717, 719~726? Change a main PCB ass'y.


Yes


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




4-11
4 Troubleshooting


WAVEFORMS
2 Digital Output Data of IC602 5 Analog Signal(Y,C) to IC602




4-12
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 #8, #14(CH1_L, R Sound) No Check a connection harness and
6 and Pin #29, #35 headphone jack / Side AV.
(CH2_L, R Sound)
of IC806?


Yes


Check the DC 12V No Check a IC806.
of IC806? Change a main PCB ass'y.



Yes



Does the signal appear at No
7 Change a main PCB ass'y.
L802~L805?



Yes



Replace the speaker ass'y?




4-13
4 Troubleshooting


WAVEFORMS

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




4-14