Page 1
Troubleshooting
Samsung Electronics 5-1
5. Troubleshooting
5-1 No Video (Raster On, No Sound)
Yes
No
Check/Replace
TU101, HC101
No
Measure the
Voltage of each of, 8 pins
of TU101
Check IC901
Pins 39, 40
See "No Video"
(Sound OK)
See "No Sound"
(Video OK)
Check/Replace
IC901,IC201,IC902 ,IC701,
Audio Module
Yes
Page 2
5-2 No Power
Troubleshooting
5-2 Samsung Electronics
Yes
No
No
Yes
No
No
No
Check the 130V,
12.7V B+ Lines
Check IC804
Pin 9 (5V)
Check/Replace
IC801, D802
Check/Replace
IC804(KA7630),DZ905,DZ804
Check IC901
Pin 18 ; Stand-by : 0V
Normal : 5V
Check/Replace
IC901
Check IC901
Pin 8 (4V).
Check/Replace
IC901(m-com)
Check IC201,
Pin 40 (H-out)
Check/Replace
IC201, Q402, Q403
No
Check Q402, Q403
Check/Replace
DZ805, IC802
Yes
Yes
Yes
Page 3
5-3 No Video (Sound OK)
Troubleshooting
Samsung Electronics 5-3
Yes
No
No
Yes
No
No
Check IC201
Pin 6 (CVBS)
Check/Replace
IC201
Check IC201
Pins 19, 20, 21
(R/G/B-OUT)
Check IC202
pin 27 (Y-IN)
Check/Replace
IC201,D205,DZ204
Check IC501,
on the CRT PCB
Check/Replace
IC501
Check/Replace
R505 (HEATER 6.3Vrms)
CRT, V999
Yes
No
Check IC201
Pin 12,37 (8V)
Check/Replace
IC804 KA7630
Yes
Yes
2Vp-p
Page 4
Troubleshooting
5-4 Samsung Electronics
5-4 No Sound (Video OK)
No
No
CHECK/REPLACE
A/V Front Assembly.
CHECK IC701
Pin 3,5
CHECK/REPLACE
Sound Module (MD701)
CHECK/REPLACE
IC701, C712, C719
CHECK IC601 Pin
Sound output
CHECK/REPLACE
IC601, R601, R602
CHECK IC701
Pin 15,18
Yes
Yes
No
Yes
1
14
15
2
5-5 Power OFF/ON (Repeatedly)
CHECK Q403
COLLECTOR H-PULSE
SEE "
NO-POWER"
NO
YES
CHEC K IC901
PIN26(H-S YNC)
CHECK/REPLACE
IC901,Q907,C913
DZ402
NO
YES
CHEC K IC301
PIN7(V-BLANK)
CHECK/REPLACE
Q301,Q302,D304
YES
NO
CHECK P IN6(+16.5V)
PIN1(-14V)
CHECK/REPLACE
R409,R413,D407,D410
DZ302,DZ303
NO
YES
CHECK/REPLACE
IC301,IC201
Page 5
Troubleshooting
Samsung Electronics 5-5
5-6 SMPS (Power Supply) Does Not Function
(1) When F 802 is open:
C heck/Replace F 802 , IC 801 , D802.
(2) When F 802 is okay, but SMPS does not function:
C heck/Replace D Z801 , DZ808 , IC 802 , DZ805 .
(3) Others: S ee "5. Troubleshooting"
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