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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.
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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.
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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.
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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
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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.
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4 Troubleshooting
3 Digital Output Data of IC201 4 Signal of HDMI(Data)
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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.
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4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC201 5 Tuner_CVBS Output Signal
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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.
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4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC515 5 Tuner_CVBS Output Signal
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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.
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4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC201 6 Analog Signal(Y,C) to IC201
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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?
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4 Troubleshooting
WAVEFORMS
7 The Signal are Inputed to IC610 8 DC +8V
9 Output WaveForm
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