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4 Troubleshooting
4 Troubleshooting
4-1 No Power
LAMP Off, power indicator LED No Check a connection power cable.
red color ? P/N: BN39-00691B
Yes s
Ye
Does proper Stand-By DC A6.2V No Change the Main Power Ass'y
appear at C156 ? 32" : BN96-03057A
40" : BN63-01649A
Yes
46" : BN63-02062A
Does proper Main DC No
B12V,B5V,B12VS appear at
C106, C115, C119?
Yes
Does proper Inverter DC No
24V appear at CNM802,
CNM803 in SMPS?
Yes
Does proper DC A5V,A3.3V No Check IC106, IC107
appear at C154, C151 ? Change the Main Ass'y
BN94-00850A
Yes
Does proper DC Check
B9V,B8V,VCC5P,B3.3V_1,B3.3V_2,
No
IC101, IC102, IC103, IC104, IC105
B5V_VCC appear at C108, C110,
C123, C128, C135, C133 ? Change the Main Ass'y BN94-00850A
Yes
Does proper DC 1.8V appear at No Check IC1101, IC1102, IC304, IC1001
C1103, C1154, C364, C1011 ? Change the Main Ass'y BN94-00850A
Yes
Does proper DC 2.5V appear at No Check IC1201, IC1702
C1214, C1746 ? Change the Main Ass'y BN94-00850A
Yes Check a other function (No picture part)
No Replace a LCD Panel
A power is supplied to set ? 32": BN07-00324A
40" : BN07-00245A
46" : BN07-00282A
4-1
4 Troubleshooting
4-2 No Video (Analog PC Signal)
Power Indicator is off.
Lamp on, no video
Yes
Check a PC source and No Input a analog PC signal.
check the connection of
Check a connected cable.
DSUB?
Yes
Does the signal appear at No Check JA801, PC cable.
1 #30,#22,#38,#41,#42 Change a PC cable. Change a main
(R,G,B,H,V) of IC901? PCB ass'y
Yes
Does the digital data appear at No Check IC901
2 output of R1034~7, R1039? Change a main PCB ass'y
Yes
Does the digital data No Check IC1002
3 appear at output of
Change a main PCB ass'y
R1010~5, R1024~7?
Yes
Check a LVDS cable? No
Please, Call to Samsung Co. LTD
Replace a LCD panel?
4-2
4 Troubleshooting
WAVEFORMS
1 2
3
4-3
4 Troubleshooting
4-3 No Video (HDMI - Digital Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check a HDMI source and No Input a HDMI signal.
check the connection of Check a connected cable.
HDMI cable?
Yes
Does the signal appear at
No Check JA802, JA804, HDMI cable.
R874,R876,R878,R879,R88
4 Change a HDMI cable. Change a
2,R883,R886-R891(Data),
main PCB ass'y
R884-5,R892-3(Clk+/-) ?
Yes
Does the digital data
No Check IC805
5 appear at output of
R901-8 ? Change a main PCB ass'y
Yes
Does the digital data No
6 appear at output of R1034- Check IC901
7, R1039 ? Change a main PCB ass'y
Yes
Does the digital data No
7 appear at output of R1010- Check IC1002
5, R1024-7 ? Change a main PCB ass'y
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-4
4 Troubleshooting
WAVEFORMS
4 5
4-5
4 Troubleshooting
4-4 No Picture (Tuner_CVBS)
Power Indicator is off.
Lamp on, no picture.
Yes
Check a RF source and No
check the connection of RF Input a RF signal.
cable ? Check a connected cable.
Yes
Check CN501.
Does the signal appear at No Check splitter cable connection.
the main splitter cable ? Change a main PCB ass'y or splitter
cable.
Yes
Does the signal appear at No Check TU501.
8
C912 ? Change a main PCB ass'y or tuner.
Yes
Does the digital data No Check IC901
9 appear at output of
Change a main PCB ass'y
R1034-7, R1039 ?
Yes
Does the digital data No Check IC1002
10 appear at output of R1010-
Change a main PCB ass'y
5, R1024-7 ?
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-6
4 Troubleshooting
WAVEFORMS
6
4-7
4 Troubleshooting
4-5 No Picture (Tuner DTV TS)
Power Indicator is off.
Lamp on, no picture.
Yes
Check a RF source and No
check the connection of RF Input a RF signal.
cable? Check a connected cable.
Yes
Check a RF source and Check CN501.
No Check splitter cable connection.
check the connection of
RF cable ? Change a main PCB ass'y or splitter
cable.
Yes
Does the digital data appear at No
RA501, RA502 (TS data) and Check TU501.
7
RA503(sync,valid,clock) Change a main PCB ass'y or tuner.
Yes
Does the digital data
appear at output of RA1401- No Check IC1301
8
4(Y/CbCr) and Change a main PCB ass'y
R1411,R1413,R1415(CLK,H,V) ?
Yes
Does the digital data appear No Check IC901
2 at output of R1034-7,
R1039 ? Change a main PCB ass'y
Yes
Does the digital data appear No Check IC1002
3 at output of R1010-5, Change a main PCB ass'y
R1024-7 ?
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-8
4 Troubleshooting
WAVEFORMS
7
8
4-9
4 Troubleshooting
4-6 No Picture(Video CVBS)
Power Indicator is off.
Lamp on, no picture.
Yes
Check a video source and No Input a video signal.
check the connection of Check a connected cable.
video cable?
Yes
No Check JA602 or Side-AV
Does the signal appear at Change a main PCB ass'y or Side-
6
C915 or C933 of IC5007 ? AV Ass'y
Yes
Does the digital data appear No Check IC901
2 at output of R1034-7, Change a main PCB ass'y
R1039 ?
Yes
Does the digital data appear No Check IC1002
3 at output of R1010-5,
Change a main PCB ass'y
R1024-7 ?
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-10
4 Troubleshooting
4-7 No Picture(S-Video Y/C)
Power Indicator is off.
Lamp on, no picture.
Yes
Check a video source and No Input a video signal.
check the connection of Check a connected cable.
s-video cable?
Yes
Does the signal appear at No Check JA604 or Side-AV
9 C928/C915,C921/C913(Y, Change a main PCB ass'y or Side-
C) of IC901 ? AV Ass'y
Yes
Does the digital data No Check IC901
2 appear at output of
Change a main PCB ass'y
R1034-7, R1039 ?
Yes
Does the digital data No Check IC1002
3 appear at output of
Change a main PCB ass'y
R1010-5, R1024-7 ?
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-11
4 Troubleshooting
WAVEFORMS
9
4-12
4 Troubleshooting
4-8 No Picture(Component1, 2 : 480i, 480p, 720p, 1080i[ Y, Pb, Pr] )
Power Indicator is off.
Lamp on, no picture.
Yes
Check component source No Input acomponent signal.
and check the connection of Check a connected cable.
component cable ?
Yes
Does the signal appear at No Check JA601
10 C919, C931, C926 Change a main PCB ass'y
(Y,Pb,Pr) of IC901 ?
Yes
Does the digital data No Check IC901
2 appear at output of
Change a main PCB ass'y
R1034-7, R1039 ?
Yes
Does the digital data No Check IC1002
3 appear at output of
Change a main PCB ass'y
R1010-5, R1024-7 ?
Yes
Check a LVDS cable ? No
Please, Call to Samsung Co. LTD.
Replace a LCD panel ?
4-13
4 Troubleshooting
WAVEFORMS
10
4-14
4 Troubleshooting
4-9 No Sound
Picture is display, no sound.
No
Check a sound source and No Input a sound signal.
check the connection of
Check a connected cable.
sound cable ?
Yes
Does the signal appear at
Check JA602, JA603, JA803,
#9,10(VIDEO1 L/R), No JA805 or Side-AV.
11 #14,15(VIDEO2 L/R),
Change a main PCB ass'y or side-
#79,80(PC,COMP,DTV,DVI-L/R)
AV Ass'y
of IC302?
Yes
Does the digital data appear at No
12#60-3(Mclk,Sclk,LRclk,data) Check IC302
of IC302 ? Change a main PCB ass'y
Yes
Does the signal appear at No Check IC401
13
L405-8 (L/R output) ? Change a main PCB ass'y
Yes
No
Replace the speaker ass'y ? Please, Call to Samsung Co. LTD.
4-15
4 Troubleshooting
WAVEFORMS
11
12
13
4-16