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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.
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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 13V No
Change a Assy PCB Power.
appear at JP845?
Yes
Does proper DC A3.3V, No Check a IC1112, Q1103.
A5V appear at
Change a main PCB ass'y.
C854, C1166_LCD?
Yes
Does proper DC 5V, 3.3V, No
1.2V appear at C1153, C1178, Check a IC1111, IC1102, IC1113.
C1170? 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.
TIP: How to drive the circuit by force when LCD panel Lamp is faulty.
- It is available to drive the circuit when the pin of 2 in Main_Power_control CN1101
connect the pin of 4.
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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 No PC cable. Change a PC
1 C2078,C2077,C2079(R, G, B)
of IC2001? cable. Change a main PCB ass'y.
Yes
Does the digital data appear No Check a IC2001
at the output of
Change a main PCB ass'y.
LVDS (RA2008~2013)?
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 IC2001
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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 IC1405
3 R1333_UX~R1340_UX? Change a main PCB ass'y.
Yes
2 Does the digital data No
appear at output of IC4001 Check a IC1405
LVDS(RA2008~2013)? Change a main PCB ass'y.
Yes
Check a LVDS cable? No
Replace lcd panel? Please, Call to Samsung Co. LTD.
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4 Troubleshooting
2 Digital Output Data of IC4001 3 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 appear No Check a B+ voltage (#3 of Tuner) 5V,
4
at R2207? change a main PCB ass'y
Yes
Does the signal appear at No
4 Change a main PCB ass'y.
C2085 of IC2001?
Yes
Does the digital data appear at No Check a IC4001.
3
output of RA2008~2013? 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 CVBS Output Signal 4 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 picture.
Yes
Dose the signal appear at No
4 Check a connection harness.
C2101 of IC2001?
Yes
Does the signal appear at No
Out of IC2001 Check a IC 2001.
RA2008~RA2013? Change a main PCB ass'y
Yes
Check a LVDS cable? No
Replace lcd panel? Please, Call to Samsung Co. LTD.
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4 Troubleshooting
WAVEFORMS
4 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
5 Dose the Y/C signal appear at No
C2088, C2091 of IC2001? Check a connection harness.
Yes
Does the digital data appear
2 No Check a IC 2001.
at Output of IC 2001,
RA2008~RA2013? 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
2 Digital Output Data of IC2001 5 Analog Signal(Y,C) to IC2001
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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 Check a connection harness and
Pin #10, #12, #13, #9 (I2S_CLK, No headphone jack./Side AV
6 I2S_SCLK, I2S_LRCLK, Check Sound Processor
I2S_DATA) of IC1202? IC1202 (SGTV5810)
Yes
Check the DC 12V No Check a B12V Line.
of IC1203? Change a main PCB ass'y.
Yes
Does the signal appear at
Pin #47 or 48, #53 or
No
54(CH1_L, R Sound) And Pin
7 Change a main PCB ass'y.
#36 or 37, #30 or 31
(CH2_L, R Sound)
of IC1203?
Yes
Replace the speaker ass'y?
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4 Troubleshooting
WAVEFORMS
6 The Signal are Inputed to IC1202 7 The Signal are Inputed to IC1203
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