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4 Troubleshooting
4 Troubleshooting
4-1 No Power
Backlight Off, power indicator No Check a connection power cable.
LED remains red color? P/N: BN39-00802A
Yes s
Ye Change the Main Power Ass'y
Does proper Stand-by DC 5V No 23": BN44-00158A
appear at C144? 26": BN44-00156A
32": BN44-00156A
Yes
40": BN44-00167A
Does proper Main DC 46": BN44-00168A
No
B13V,B5V,B12VS appear at
C103,C113,C117?
Yes
Does proper Inverter DC 24V No
appear at CNM802 in SMPS?
Yes
Does proper DC A5V,A3.3V No Check IC106, IC107
appear at C144,C140? Change the Main Ass'y refer to Parts list
Yes
Does proper DC B9V, B8V, No
PANEL_VCC,B3.3V_1 Check IC100,D100,IC101,IC103
appear at C106, C107, Change the Main Ass'y refer to Parts list
C121,C131?
Yes
Does proper DC No Check IC203
MEM1.8V appear at C232,C230? Change the Main Ass'y refer to Parts list
Yes
Does proper DC 2.5_IO, No Check IC401, IC1200
B2.5V_MSTV appear at
Change the Main Ass'y refer to Parts list
C450,C1225?
Yes
Check another function refer to page
No 4-6 ~ 4-14. Replace a LCD panel
A power is supplied to set?
refer to Parts list.
4-1
4 Troubleshooting
4-2 No Video (Analog PC Signal)
Power Indicator is off.
backlight on, no video
Yes
Check the PC source and No Input an analog PC signal.
check the connection of
Check the connected cable.
DSUB?
Yes
Does the signal appear at No Check JA700, PC cable.
1 #11,#9,#6,#2,#3 Change the PC cable. Change the
(R,G,B,H,V) of IC1201? main PCB ass'y
Yes
Does the digital data appear at No Check IC1201
2 output of RA1201~6? Change the main PCB ass'y
Yes
Does the digital data appear No Check IC202
3 at output ofRA200~5,
Change the main PCB ass'y
R288,R290,R294?
Yes
Does the digital data appear
at output of R1325,1327~30, No Check IC1301
4
1332,1335,1337,1339,1341, Change the main PCB ass'y
1343,1346?
Yes
Check the LVDS cable? No
Please call Tech support
Replace the LCD panel?
4-2
4 Troubleshooting
WAVEFORMS
1 2 3 PC Input (V-Sync, H-Sync)
4 LVDS Out (CLK + / -)
4-3
4 Troubleshooting
4-3 No Video (HDMI - Digital Signal)
Power Indicator is off.
backlight on, no video.
Yes
Check the HDMI source No Input an HDMI signal.
and check the connection Check the connected cable
of HDMI cable?
Yes
Does the signal appear at No Check JA701, JA703, HDMI cable.
5 R774,775,782,783(CLK), Change the HDMI cable. Change
R776~781,R784~789(Data)? the main PCB ass'y
Yes
Does the digital data
appear at output of No Check IC1202
6
PIN# 1,2,4,5,7,8,10,11 of Change the main PCB ass'y
IC1202?
Yes
Does the digital data appear No Check IC1201
at output of RA1201~6? Change the main PCB ass'y
Yes
Does the digital data appear at No
output of RA200~5, Check IC202
R288,R290,R294? Change the main PCB ass'y
Yes
Does the digital data appear at
output of R1325,1327~30, No Check IC1301
1332,1335,1337,1339,1341, Change the main PCB ass'y
1343,1346?
Yes
Check the LVDS cable ? No
Please call Tech support
Replace the LCD panel ?
4-4
4 Troubleshooting
WAVEFORMS
5 6 HDMI Input (CLK + / -)
4-5
4 Troubleshooting
4-4 No Picture (Tuner_CVBS)
Power Indicator is off.
backlight on, no picture.
Yes
Check the RF source and No Input the RF signal.
check the connection of RF
Check the connected cable.
cable?
Yes
Does the signal appear at No Check TU500.
7
pin#10 of TU500 and IC206? Change the main PCB ass'y or tuner
Yes
Does the digital data appear No Check IC202
at output of RA200~5, Change the main PCB ass'y
R288, R290, R294?
Yes
Does the digital data appear No
at output of R1325,1327~30, Check IC1301
1332,1335,1337,1339, Change the main PCB ass'y
1341,1343,1346?
Yes
Check the LVDS cable ? No
Please call Tech support
Replace the LCD panel ?
4-6
4 Troubleshooting
WAVEFORMS
7 Tuner CVBS Out (Pattern: Grey Bar)
4-7
4 Troubleshooting
4-5 No Picture (Tuner DTV TS)
Power Indicator is off.
backlight on, no picture.
Yes
Check the RF source and No Input an RF signal.
check the connection of RF
Check the connected cable.
cable?
Yes
No
Does the digital data appear Check TU500.
8
at #10,11 of TU500? Change the main PCB ASS`Y or tuner.
Yes
Does the digital data appear at No Check IC202
output of RA200~5, Change the main PCB ass'y
R288, R290, R294?
Yes
Does the digital data appear
No Check IC1301
at output of R1325,1327~30,
Change the main PCB ass'y
1332, 1335, 1337, 1339,
1341, 1343, 1346?
Yes
Check a LVDS cable? No Please call Tech support
Replace a LCD panel?
4-8
4 Troubleshooting
WAVEFORMS
8 DTV RF +/-
4-9
4 Troubleshooting
4-6 No Picture(Video CVBS)
Power Indicator is off.
backlight on, no picture.
Yes
Check the video source and No Input a video signal.
check the connection of Check the connected cable.
video cable?
Yes
Does the digital data appear at No Check JA800.
C217,C218? Change the main PCB ASS`Y or JA800.
Yes
Does the digital data appear No Check IC202
at output of RA200~5, Change the main PCB ass'y
R288, R290, R294?
Yes
Does the digital data appear
at output of R1325,1327~30, No
Check IC1301
1332,1335,1337,1339, Change the main PCB ass'y
1341,1343,1346?
Yes
Check the LVDS cable? No
Please call Tech support
Replace the LCD panel?
4-10
4 Troubleshooting
4-7 No Picture(S-Video Y/C)
Power Indicator is off.
backlight on, no picture.
Yes
Check the video source and No Input the S-video signal.
check the connection of Check the connected cable
s-video cable?
Yes
Does the signal appear at No Check JA804.
9 C200,C201 (for chroma), Change the main PCB ASS`Y or JA804.
C209,C210(for luminance)?
Yes
Does the digital data appear No Check IC202
at output of RA200~5,
Change the main PCB ass'y
R288,R290,R294?
Yes
Does the digital data appear
at output of R1325,1327~30, No
Check IC1301
1332,1335,1337,1339, Change the main PCB ass'y
1341,1343,1346?
Yes
Check a LVDS cable? No
Please call Tech support
Replace a LCD panel?
4-11
4 Troubleshooting
WAVEFORMS
9 S-VIDEO Input (Y/C)
4-12
4 Troubleshooting
4-8 No Picture(Component1, 2 : 480i, 480p, 720p, 1080i[ Y, Pb, Pr] )
Power Indicator is off.
backlight on, no picture.
Yes
Check component source and No Input a component signal.
check the connection of Check the connected cable.
component cable ?
Yes
Does the signal appear at
C1232,C1223,C1236 (Y, Pb, Pr No Check JA801,JA803
10
for comp1),C1247, C1240, C1249 Change the main PCB ASS`Y
(Y, Pb, Pr for comp2)?
Yes
Does the digital data appear No Check IC202
at output of RA200~5,
Change the main PCB ass'y
R288,R290,R294?
Yes
Does the digital data appear
at output of R1325,1327~30, No Check IC1301
1332,1335,1337,1339, Change the main PCB ass'y
1341,1343,1346?
Yes
Check a LVDS cable? No
Please call Tech support
Replace a LCD panel?
4-13
4 Troubleshooting
WAVEFORMS
10 Component Input (Y/Pb)
4-14
4 Troubleshooting
4-9 No Sound
Picture is display, no sound.
Yes
Check the sound source and No Input a sound signal.
check the connection of
Check the connected cable.
sound cable ?
Yes
Does the signal appear at Check JA800,JA803,JA808 &
No SIDE AV Change the
C1007,C1016,C1012,C1020,
C1009,C1017,C1011,C1018? main PCB ASS`Y
Yes
Check IC1001,JA704,JA702
Does the signal appear at No or SIDE AV Change the
11
#50~55 for IC1002? main PCB ass'y
Yes
Does the digital data appear No Check IC1002
12
at #4~6 of IC1002? Change the main PCB ass'y
Yes
Does the digital data appear No Check IC1100
13
at L1101,L1104? Change the main PCB ass'y
Yes
No
Replace the speaker ass'y? Please call Tech support
4-15
4 Troubleshooting
WAVEFORMS
11 Audio Input (Sign Wave)
12 12S Input (Clk, Data)
13 Audio Amp Out (Sign Wave)
4-16