Page 1
4 Troubleshooting
4-1
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.
Page 2
4 Troubleshooting
4-2
4-2-1 No Power
4-2 Checkpoints by Error Mode
Does proper DC 12V
appear at CM801?
Change a Assy PCB Power.
Yes
Yes
No
Check a connection a power cable.
No
Does proper DC A3.3V,
A5V appear at
C1059, C1167?
Check a IC1008, Q1013.
Change a main PCB ass'y.
Yes
No
Does proper DC 5V, 3.3V,
1.9V appear at C1015, C1130,
C1095?
Check a IC1005, IC1002, IC1014,
IC1011. Change a main PCB ass'y.
Yes
A power is supplied to set?
Check a other function.
(No picture part)
Replace a lcd panel.
No
No
LAMP off, power indicator
LED red color?
Page 3
4 Troubleshooting
4-3
4-2-2 No Video (Analog PC)
Check a PC source and check
the connection of DSUB cable?
Input a analog PC signal and
connected cable(DPMS).
Yes
Does the signal appear at
#30, 22, 38(R, G, B) of
IC4001?
PC cable. Change a PC
cable. Change a main PCB ass'y.
Yes
Power Indicator is off.
Lamp on, no video.
No
No
1
Does the digital data appear
at the output of
LVDS (R41043~4113)?
Check a IC4001
Change a main PCB ass'y.
Yes
Check a LVDS cable?
Replace a lcd panel?
Please, Call to Samsung Co. LTD.
Yes
No
No
Page 4
4 Troubleshooting
4-4
WAVEFORMS
1
R,G,B Output Signal of IC500
Page 5
4 Troubleshooting
4-5
4-2-3 No Video (Digital-HDMI)
Check the connection
of HDMI cable?
Input a HDMI cable.
Yes
Does the digital data appear at
R2106~R2113?
Check a a IC 500
Change a main PCB ass'y.
Yes
Does the digital data
appear at output of IC4001
LVDS(R4104~4113)?
Check a IC500
Change a main PCB ass'y.
Yes
Check a LVDS cable?
Replace lcd panel?
Please, Call to Samsung Co. LTD.
Yes
Power Indicator is off.
Lamp on, no video.
No
No
No
No
3
2
Page 6
4 Troubleshooting
4-6
2
Digital Output Data of IC500
3
Signal of HDMI(Data)
Page 7
4 Troubleshooting
4-7
4-2-4 No Picture (Tuner_CVBS)
Dose the signal appear
at R5014?
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass'y
Yes
Does the signal appear at
#8 of IC4001?
Change a main PCB ass'y.
Yes
Does the digital data appear at
output of R4104~R4113?
Check a IC4001.
Change a main PCB ass'y.
Yes
Power Indicator is off.
Lamp on, no picure.
No
Connect the RF cable and
check RF signal.
No
No
No
Yes
Check a LVDS cable?
Replacea lcd panel?
Please, Call to Samsung Co. LTD.
No
4
4
3
Page 8
4 Troubleshooting
4-8
WAVEFORMS
4
Tuner_CVBS Output Signal
3
CVBS Output Signal
Page 9
4 Troubleshooting
4-9
4-2-5 No Picture (Video_CVBS)
Dose the signal appear at
#10 of IC4001?
Check a connection harness.
Yes
Does the signal appear at
Out of IC4001 R4104~R4113?
Check a IC4001.
Change a main PCB ass'y
Yes
Power Indicator is off.
Lamp on, no picture.
No
Check a A/V cable and video signal.
No
No
Yes
Check a LVDS cable?
Replace lcd panel?
Please, Call to Samsung Co. LTD.
No
4
Page 10
4 Troubleshooting
4-10
WAVEFORMS
4
CVBS Output Signal
Page 11
4 Troubleshooting
4-11
4-2-6 No Picture (S-VIDEO_Y,C)
Dose the Y/C signal appear at
#21, #31 of IC4001?
Check a connection harness.
Yes
Yes
Power Indicator is off.
Lamp on, no picure.
No
Connect the s-video cable.
Operating a video player.
No
Does the digital data appear at
Output of IC4001,
R4104~R4113?
Check a IC4001.
Change a main PCB ass'y.
No
Yes
Check a LVDS cable?
Replacea lcd panel?
Please, Call to Samsung Co. LTD.
No
5
2
Page 12
4 Troubleshooting
4-12
2
Digital Output Data of IC500
5
Analog Signal(Y,C) to IC500
WAVEFORMS
Page 13
4 Troubleshooting
4-13
Does the signal appear at
Pin #60, #61, #62, #63(I2S_CLK,
I2S_SCLK,
I2S_LRCLK, I2S_DATA)
of IC1009 ?
Check a connection harness and
headphone jack./Side AV
Check Sound Processor
IC1009(STV8257)
Yes
Yes
No
Check the DC 12V
of IC1015?
Check a B12V Line.
Change a main PCB ass'y.
Yes
No
Does the signal appear at
Pin #10 , #16(CH1_L, R
Sound)
And Pin #3, #9
(CH2_L, R Sound)
of IC1015 ?
Change a main PCB ass'y.
Yes
Replace the speaker ass'y?
No
4-2-7 No Sound
6
7
Connect a sound cable.
control a volume.
Picture is display, no sound.
No
Page 14
4 Troubleshooting
4-14
WAVEFORMS
6
The Signal are Inputed to IC603
7
DC +12V
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