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Troubleshooting
5. Troubleshooting
5-1 No Video (Raster On, No Sound)
Open the IF Pin of Tuner
Measure the Voltage of Each Pin of TU01
No
Check/Replace TU01,
Yes
Check IC901 Pins 39, 40 Yes
No
Check/Replace IC901, IC201
See "No Video" (Sound OK)
See "No Sound" (Video OK)
Samsung Electronics
5-1
Troubleshooting
5-2 No Power
Check the 125V, 13.0V B+ Lines
No
Check/Replace IC801, D801, F802
Yes
Check IC802 Pin 9 (5V)
No
Check/Replace IC802 (KA7630)
Check IC901 Pin 16 (4V).
No
Check/Replace IC901
Yes
Check IC901 Pin 18 ; Stand-by : 0V Normal : 5V
No
Check/Replace IC901, (µ-com).
Check IC201, Pin 40 (H-out)
No
Check/Replace IC201, Q401, Q402.
5-2
Samsung Electronics
Troubleshooting
5-3 No Video (Sound OK)
Check IC201 Pin 12,37 (8V)
No
Check/Replace IC802 KA7630
Yes
Check IC201 Pin 6 (CVBS)
No
Check/Replace IC201
Yes
Check IC201 Pins 19, 20, 21
No
Check IC201 pin 27 (Y-IN)
No
Check/Replace IC201, Q203
Yes
Check IC501 on the CRT PCB
No
Check/Replace IC501
Check/Replace R417, R505 (HEATER 6.3Vrms) D503 (CRT G1 pin) CRT, V999
Samsung Electronics
5-3
Troubleshooting
5-4 No Sound (Video OK)
Check IC201 Pin 15 (Sound Out) No
Check/Replace IC201
Yes
Check IC602 Pins 1,7 (0V)
Yes
Check/Replace Q903, Q907
No
Check IC602 Pin 4 (B+ 10-12.5V)
No
Check/Replace R812, R813
Yes
Check IC602
No
Check/Replace IC602
Yes Check/Replace A/V Front assembly.
5-5 No TTX
Check IC901 Pins 24 Yes Check/Replace QT02, IC901
No
Check IC901 Pin 31,32,33,34,35
No
Check/Replace IC901
Yes
Check IC201 Pin 23, 24, 25, 26
No
Check/Replace IC201
Yes
See No Video
5-4
Samsung Electronics