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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