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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 Drive Board, and between the Logic Boards. Video Board, between the SMPS X, Y
4-1
4 Troubleshooting
4-2 Checkpoints by Error Mode 4-2-1 No Power
LAMP off, power indicator LED red color? No Check a connection a power cable.
Yes
Does proper DC 12V appear at C801, C807?
No Change a Assy PCB Power.
Yes Does proper DC A3.3V, A5V appear at C865, C863?
No
Check a IC812, IC801. Change a main PCB ass'y.
Yes Does proper DC 5V, 3.3V, 1.9V appear at C870, C861, C847?
No
Check a IC813, IC811, IC807. Change a main PCB ass'y.
Yes
A power is supplied to set?
No
Check a other function. (No picture part) Replace a lcd panel.
4-2
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 the connection of DSUB cable? Yes Does the signal appear at #3, 5, 7(R, G, B) of IC906? Yes Does the signal appear at #21,19,15(R,G,B)of IC906? Yes Does the digital data appear at output of DIN(0:23)of IC312? Yes Does the digital data appear at output of LVDS TX(FT250~253)? Yes Check a LVDS cable? Replace a lcd panel? No Please, Call to Samsung Co. LTD. No No No No No
Input a analog PC signal and connected cable(DPMS).
1
PC cable. Change a PC cable. Change a main PCB ass'y.
1
Check a IC906. Change a main PCB ass'y.
2
Check a IC312. Change a main PCB ass'y.
3
Check a IC201. Change a main PCB ass'y.
4-3
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
4-4
4 Troubleshooting
4-2-3 No Video (HDMI-Digital Signal)
Power Indicator is off. Lamp on, no video. Yes Check the connectionn of HDMI cable? Yes Does the digital data IC311 DIN(0:23), HDMI(Data, Clk +/-)? Yes Does the digital data appear at output of IC201 LVDS(FX250~253)? Yes Check a LVDS cable? Replacea lcd panel? No Please, Call to Samsung Co. LTD. No No No Input a HDMI cable.
4
Check a a IC 311. Change a main PCB ass'y.
3
Check a IC201. Change a main PCB ass'y.
4-5
4 Troubleshooting 3 Digital Output Data of IC201 4 Signal of HDMI(Data)
4-6
4 Troubleshooting
4-2-4 No Picture (Tuner_CVBS)
Power Indicator is off. Lamp on, no picure. Yes Dose the signal appear at #14 of IC203? Yes Does the signal appear at #13 of IC203? Yes Does the digital data appear at output of FT250~FT253 ? Yes Check a LVDS cable? Replacea lcd panel?
No
Connect the RF cable and check RF signal.
5
No
Check a B+ voltage (#7 of Tuner) : 5V change a main PCB ass'y
5
No
Check a IC203. Change a main PCB ass'y.
3
No
Check a IC201. Change a main PCB ass'y.
No Please, Call to Samsung Co. LTD.
4-7
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC201 5 Tuner_CVBS Output Signal
4-8
4 Troubleshooting
4-2-5 No Picture (Video_CVBS)
Power Indicator is off. Lamp on, no picure. Yes Dose the signal appear at #11 of IC203? Yes Does the signal appear at #13 of IC203? Yes Does the digital data appear at output of FT250~FT253? Yes Check a LVDS cable? Replacea lcd panel?
No Check a A/V cable and video signal.
5
No Check a connection harness.
5
No
Check a IC203. Change a main PCB ass'y.
3
No
Check a IC515. Change a main PCB ass'y.
No Please, Call to Samsung Co. LTD.
4-9
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC515 5 Tuner_CVBS Output Signal
4-10
4 Troubleshooting
4-2-6 No Picture (S-VIDEO_Y,C)
Power Indicator is off. Lamp on, no picure. Yes
6
No
Connect the s-video cable. Operating a video player.
Dose the signal appear at R722, R721 of IC201? Yes Does the digital data appear at Output of FT250~FT253? Yes Check a LVDS cable? Replacea lcd panel?
No Check a connection harness.
3
No
Check a IC201. Change a main PCB ass'y.
No Please, Call to Samsung Co. LTD.
4-11
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC201 6 Analog Signal(Y,C) to IC201
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 51, 50(CH1_L, R Sound) 7 and Pin 57, 58 (CH2_L, R Sound) of IC610 (MSP4410K)?
No
Check a connection harness and headphone jack.
Yes
8
Check the DC 8V of IC610?
No
Check a IC813. Change a main PCB ass'y.
Yes
9
Does the signal appear at L617?
No
Check a IC611. Change a main PCB ass'y.
Yes
Replace the speaker ass'y?
4-13
4 Troubleshooting
WAVEFORMS
7 The Signal are Inputed to IC610 8 DC +8V
9 Output WaveForm
4-14