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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
6 and Pin #29, #35 Check a connection harness and
(CH2_L, R Sound) headphone jack / Side AV.
of IC806?
Yes
Check the DC 12V No Check a IC806.
of IC806? Change a main PCB ass'y.
Yes
7 Does the signal appear at No
L802~L805? Change a main PCB ass'y.
Yes
Replace the speaker ass'y?
4-13
4 Troubleshooting
WAVEFORMS
6 The Signal are Inputed to IC603 7 DC +12V
4-14