Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LE23R71BH 06_Troubleshooting
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4 Troubleshooting
4 Troubleshooting
4-1 No Power
LAMP off, power indicator No
Check power cable connection.
LED red color?
Yes
Does proper DC 12V No
Change Power PCB Assy.
appear at C820, C823?
Yes
Does proper DC A3.3V, No Check IC816, IC815
A5V appear at
Change main PCB ass'y.
C834, C830?
Yes
Does proper DC 5V, 3.3V, No
1.8V appear at C813, C811, Check IC821, IC811
C816? Change main PCB ass'y.
Yes
Check the LVDS Cable.
And replace LCD Panel.
4-1
4 Troubleshooting
4-2 No Video (Analog PC Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check PC source and check No Input an analog PC signal and
the connection of DSUB cable? connect cable.
Yes
Does the signal appear at No
1 Change PC Cable.
R781, R782, R783?
Yes
Does the digital data appear
at output of No Check IC310.
3
LVDS TX(R422~R425, Change main PCB ass'y.
R430~R433)?
Yes
Check LVDS cable? No
Replace lcd panel? Please call Samsung Co. LTD.
4-2
4 Troubleshooting
WAVEFORMS
1 R,G,B Output Signal 3 Digital Output Data of IC310
4-3
4 Troubleshooting
4-3 No Video (HDMI/DVI-Digital Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check the connectionn No
Input an HDMI/DVI Signal.
of HDMI/DVI cable?
Yes
Does the digital data appear at No
Change HDMI/DVI Cable.
4 FT2704, 2705, 2706, 2708?
Yes
Does the digital data
No
3 appear at output of IC310 Check IC310.
LVDS(R422~R425, R430~R433)? Change main PCB ass'y.
Yes
Check LVDS cable? No
Replace lcd panel? Please call Samsung Co. LTD.
4-4
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC310 4 Signal of DVI(Data)
4-5
4 Troubleshooting
4-4 No Picture (Tuner_CVBS)
Power Indicator is off. No Connect the RF cable and
Lamp on, no picure. check RF signal.
Yes
Does the signal appear at No
5 Check IC210.
C268? Change main PCB ass'y.
Yes
Does the digital data appear No
3 at output of R422~R425, Check IC310.
R430~R433? Change main PCB ass'y.
Yes
Check LVDS cable? No
Replace lcd panel? Please call Samsung Co. LTD.
4-6
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC310 5 Tuner_CVBS Output Signal
4-7
4 Troubleshooting
4-5 No Picture (Video_CVBS)
Power Indicator is off. No
Check A/V cable and video signal.
Lamp on, no picure.
Yes
Does the signal No
5 Change A/V Cable.
appear at R7003?
Yes
Does the digital data appear No
3 at output of R422~R425, Check IC310.
R430~R433? Change main PCB ass'y.
Yes
Check LVDS cable? No
Replace lcd panel? Please call Samsung Co. LTD.
4-8
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC310 5 Tuner_CVBS Output Signal
4-9
4 Troubleshooting
4-6 No Picture (S-VIDEO_Y,C)
Power Indicator is off. No Check s-video cable connection.
Lamp on, no picure. Check Video Source.
Yes
Does the signal appear at No
6 Change S-Video Cable.
R7001, R7002?
Yes
Does the digital data appear No Check IC310.
3 at Output of R422~R425,
R430~R433? Change main PCB ass'y.
Yes
Check LVDS cable? No
Replace lcd panel? Please call Samsung Co. LTD.
4-10
4 Troubleshooting
WAVEFORMS
3 Digital Output Data of IC310 6 Analog Signal(Y,C)
4-11
4 Troubleshooting
4-7 No Sound
No
Picture is displayed, no sound. Check sound cable and
volume control.
Yes
Does the signal appear at
Pin 12, 1(CH1_L, R Sound) No Check connection harness and
7 and Pin 15, 2 headphone jack.
(CH2_L, R Sound)
of IC613?
Yes
Does the DC 8V No Check IC813.
8
appear at C653? Change main PCB ass'y.
Yes
Does the signal appear at No Check IC611.
9
L624_OP, L625_OP? Change main PCB ass'y.
Yes
Replace the speaker ass'y?
4-12
4 Troubleshooting
WAVEFORMS
7 The Signal are Inputed to IC610 8 DC +8V
9 Output WaveForm
4-13
4 Troubleshooting
Memo
4-14
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