Samsung LN46N71B, LN26R71B 06 Troubleshooting
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.
4 Troubleshooting
4-2
4-2-1 No Power
4-2 Checkpoints by Error Mode
Does proper DC 12V
appear at CN800?
Change a Assy PCB Power.
Yes
Yes
No
Check a connection a power cable.
No
Does proper DC A3.3V,
A5V appear at
C854, C866?
Check a IC809, IC802.
Change a main PCB ass'y.
Yes
No
Does proper DC 5V, 3.3V,
1.8V appear at C811, C853,
C833?
Check a IC803, IC805, IC813, IC307.
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?
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 IC500?
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 (R563_OP~R572_OP)?
Check a IC500
Change a main PCB ass'y.
Yes
Check a LVDS cable?
Replace a lcd panel?
Please, Call to Samsung Co. LTD.
Yes
No
No
4 Troubleshooting
4-4
WAVEFORMS
1
R,G,B Output Signal of IC500
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
R503~R510?
Check a a IC 500
Change a main PCB ass'y.
Yes
Does the digital data
appear at output of IC500
LVDS(R563_OP~R572_OP)?
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
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