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Troubleshooting
6. Troubleshooting
6-1 Service Mode
1. To enter the Service Mode, press the remote-control keys in the following sequence:
Display Picture Standard Mute Power
2. Use the Channel UP/DOWN keys to move within the Service Mode.
3. Use the Vol (+) key and Vol ( - ) key to change data.
(1) Press the Vol (+) key to increase data.
(2) Press the Vol (-) key to decrease data.
4. Use the Power key to exit and store data in memory.
Samsung Electronics 6-1
Troubleshooting
6-2 No Power
Check Stand-by 5V Yes
on the Main Board
No
Check Check LED Operation
SDA1/SCL1 Yes See "5-7 LED Display
on the Micom Check"
Module
See "6-5 No Standy"
No
Check/Replace
Tuner
MICOM Module
AUDIO Module
A/V Terminal Board
(TDA6920)
Progressive Module
LCD Control Board
(TDA4780)
6-2 Samsung Electronics
Troubleshooting
6-3 No Picture
Yes Check IC101 (TDA9810) No
#10 (AGC), #12 (CVBS)
Check Progressive
No Module M-Y/CVBS,2Hsync,Vsync, Yes
2Y,2R-Y,2B-Y,Href Check/Replace
IC101, Tuner
Replace
Progressive Module
No Check ICL404 (TDA4780) Yes
#14 (Sand castle pulse)
No Check IC401,402,403 Yes
#5 (74HC1230 Check
No ICL404(TDA4780)#6(B-Y) Yes
First check the circuitry #7(R-Y),#8(Y),#27(SDA)
connected to the IC and #28(SCL)
replace the IC
Check CL129,
No 130,131 and AC2 5P connector for Yes
#6,7,8 Check AC1 12P and SDA,SCL
output of micom module
for #27,28
Check the circuitry near
ICL404 and replace Check ICL404(TDA4780)
micom module No
#20(B-OUT),#22(G-OUT)
#24(R-OUT)
Yes
Check the circuitry near
ICL404, replace IC201
(TDA4780)
No Check ICL204(CXA1853Q) Yes
#9(R-in),#10(G-in),#11(B-in)
Check the circuitry near
QL401,QL402,QL403
around of ICL404(TDA4780) Check ICL205(CXA2504N)
No Yes
#23,#25,#27,#33,#35,#37
Replace ICL205(CXA2504N) Check/ Replace
CNL04 (24P)
Samsung Electronics 6-3
Troubleshooting
6-4 No Sound
Yes Check IC601,# 5 (MUTE) No
No Check Audio Module Yes
MAIN-L, SUR, CENTER,
S-RESET, QSS-IN Check/Replace
Q602, Q603
Micom Module
IC601
Check/Replace
IC101
Micom Module
No Check IC604 Yes
Audio Module
#9, #14, #15
Check/Replace
Replace
IC604
IC601
MICOM Module
6-5 No Standby (+5V)
Check Check/Replace
the voltage of IC808 Yes
IC808 Regulator
pin 5 (over 6V) IC (SI-3050C)
No
Check the AC Yes Check the associated
power supply of D826 circuitry parts of T802, IC801
No
Yes
Check F801 Replace F801
(AC250V/6.3A)
No
Check L801,L802, C801,
C802, V801, R801
6-4 Samsung Electronics
Troubleshooting
6-6 No FAN Voltage (+8V)
Check Yes Check /Replace
the voltage of IC805 Regulator
IC805 pin 5 (12V) IC (SI-3050C)
No
Check the voltage Yes
Check L811,
of T801 pin12 D821, C836
No
Check
T801/Replace trans
6-7 Lamp Does Not Work
Standby/Temp LED,
Picture LED, Lamp LED flicker at Yes Check/Replace
the same time? Or, check the lamp Lamp
time (6000 hrs)
No
Check Yes Check the voltage Yes
the DC voltage of BALLAST of AB1 (connector) pin1 on the
(about 300V) Main Board (over 3.5V)
No No
Check F801 (on the Check the voltage
Power Board), D803, and Check AB1 on the
of IC904(SAA1300) pin 6 Ballast Board
surrounding circuitry (over 3.5V)on the Main Board
Samsung Electronics 6-5
Troubleshooting
6-8 Horizontal Sync Flows
Horizontal Sync Flows
Yes
Check
the output of 2H-Sync No Replace the
from the progressive progressive module
module
Yes
Check
the output of 2H-Sync No Check Connector
HREF to LCD Control Assy AC1
Board
Yes
Check the input of No Check ICL402
2H-sync to ICL301(CXD2443Q) Pin 13 on (74HC123) Pin13,FI302
the LCD Control Board
Yes
Check the No Check voltage of TL301
voltage of CNL06 so that the voltage of
RPD (2.8V) CNL06 RPD is 2.8V
Yes
Check the connector to
LCD panel (CNL04)
6-6 Samsung Electronics
Troubleshooting
6-9 Vertical Sync Flows
Vertical Sync Flows
Yes
Check
the output of V-Sync No Replace the
HREF from progressive progressive module
module
Yes
Check
the input of V-Sync No Check Connector
to LCD Control Assy AC1
Board
Yes
Check the input No
of V-Sync to ICL301 Pin 14 Check ICL402
on LCD Control Board (74HC123) Pin 5
Yes
Check CNL04 (connector
to LCD panel)
Samsung Electronics 6-7