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, DC 5V
appear at CN101?
Change a Assy PCB Power.
Yes
Yes
No
Check a connection a power cable.
No
Does proper DC A3.3V,
A5V appear at
C126, C127?
Check a IC104, Q104.
Change a main PCB ass'y.
Yes
No
Does proper DC 12V, 9V, 3.3V,
2.5V, 1.8V appear at C109,
C105, C132, C145, C159 ?
Check a IC102_CPT, IC101, IC105,
IC106, IC109.
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 C313,
C316, C320 near IC602?
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 (R716, 717, 719~726)?
Check a IC602
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 IC602
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
R738~R745?
Check a a IC602
Change a main PCB ass'y.
Yes
Does the digital data
appear at output of IC602
LVDS(R716, 717, 719~726)?
Check a IC602
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 IC602
3
Signal of HDMI(Data)
Page 7
4 Troubleshooting
4-7
4-2-4 No Picture (Tuner_CVBS)
Dose the signal appear
at R126?
Check a B+ voltage (#6 of Tuner) 5V,
change a main PCB ass'y
Yes
Does the signal appear at
C611 near IC602?
Change a main PCB ass'y.
Yes
Does the digital data appear
at output of
R716, 717, 719~726?
Check a IC602.
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
4
Tuner_CVBS Output Signal
3
CVBS Output Signal
Page 9
4 Troubleshooting
4-9
4-2-5 No Picture (Video_CVBS)
Does the signal appear at
C614 near IC602?
Check a connection harness.
Yes
Does the signal appear at
Out of IC602
R716, 717, 719~726?
Check a IC602.
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)
Does the signal appear at
C612,C613 near IC602?
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 IC602,
R716, 717, 719~726?
Check a IC602.
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 IC602
5
Analog Signal(Y,C) to IC602
WAVEFORMS
Page 13
4 Troubleshooting
4-13
Does the signal appear at
Pin #8, #14(CH1_L, R Sound)
and Pin #29, #35
(CH2_L, R Sound)
of IC806?
Check a connection harness and
headphone jack / Side AV.
Yes
Yes
No
Check the DC 12V
of IC806?
Check a IC806.
Change a main PCB ass'y.
Yes
No
Does the signal appear at
L802~L805?
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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