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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 Video Board.

3. Check the voltage in and out between the SMPS Video Board, between the SMPS X, Y
Drive Board, and between the Logic 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 No
Change a Assy PCB Power.
appear at C801, C807?



Yes


Does proper DC A3.3V, No Check a IC812, IC801.
A5V appear at
Change a main PCB ass'y.
C865, C863?


Yes


Does proper DC 5V, 3.3V, No
1.9V appear at C870, C861, Check a IC813, IC811, IC807.
C847? 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 Signal)



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 No PC cable. Change a PC
1
#3, 5, 7(R, G, B) of IC906? cable. Change a main PCB ass'y.


Yes


Does the signal appear at No Check a IC906.
1
#21,19,15(R,G,B)of IC906? Change a main PCB ass'y.


Yes

Does the digital data appear No Check a IC312.
2 at output of
Change a main PCB ass'y.
DIN(0:23)of IC312?

Yes

Does the digital data appear at No Check a IC201.
3 output of
Change a main PCB ass'y.
LVDS TX(FT250~253)?


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 IC906 2 R,G,B Output Signal of IC312




3 Digital Output Data of IC201




4-4
4 Troubleshooting

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



Power Indicator is off.
Lamp on, no video.

Yes


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


Yes

Does the digital data IC311 No Check a a IC 311.
4 DIN(0:23),
HDMI(Data, Clk +/-)? Change a main PCB ass'y.


Yes

Does the digital data No
3 appear at output of IC201 Check a IC201.
LVDS(FX250~253)? Change a main PCB ass'y.


Yes


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




4-5
4 Troubleshooting


3 Digital Output Data of IC201 4 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 No Check a B+ voltage (#7 of Tuner) :
5 5V change a main PCB ass'y
appear at #14 of IC203?


Yes


Does the signal appear at No
5 Check a IC203.
#13 of IC203? Change a main PCB ass'y.


Yes


Does the digital data appear at No Check a IC201.
3
output of FT250~FT253 ? 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


WAVEFORMS

3 Digital Output Data of IC201 5 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 picure.

Yes


Dose the signal No
5 Check a connection harness.
appear at #11 of IC203?


Yes


Does the signal appear at No
5 Check a IC203.
#13 of IC203? Change a main PCB ass'y.


Yes


Does the digital data appear at No Check a IC515.
3
output of FT250~FT253? Change a main PCB ass'y.


Yes


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




4-9
4 Troubleshooting


WAVEFORMS

3 Digital Output Data of IC515 5 Tuner_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

Dose the signal appear at No
6 Check a connection harness.
R722, R721 of IC201?


Yes


Does the digital data appear at No Check a IC201.
3
Output of FT250~FT253? 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
3 Digital Output Data of IC201 6 Analog Signal(Y,C) to IC201




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 51, 50(CH1_L, R Sound) No Check a connection harness and
7 and Pin 57, 58 headphone jack.
(CH2_L, R Sound)
of IC610 (MSP4410K)?


Yes


Check the DC 8V No Check a IC813.
8
of IC610? Change a main PCB ass'y.



Yes



Does the signal appear at No Check a IC611.
9
L617? Change a main PCB ass'y.



Yes



Replace the speaker ass'y?




4-13
4 Troubleshooting


WAVEFORMS

7 The Signal are Inputed to IC610 8 DC +8V




9 Output WaveForm




4-14