No Video - Samsung CF21M Service Manual

5-1-17 No Video

Check signal cable and connection.
IC101 Pins 2, 4 and 6 (19": IC105,
Pins 2, 4 and 6) inputs are right?
Yes
IC101 Pins 20, 22 and 24
(19": IC105, Pins 20, 22, 24)
outputs are right?
Yes
IC102 Pins 25, 28 and 30
(19": IC101, 29, 32, 35)
outputs are right?
Yes
Are there waveforms at CRT
15
Socket Pin Red, Green, Blue?
Yes
G2 voltage is right?
Heater Voltage is right?
Yes
Change CRT.
Done.
CF21M*
No
Check CN101, IC1, QR51, QG51,
QB51, and IC3 on BNC Board.
No
Check Vcc on IC101 (19": IC105)
and replace IC101 (19": IC105).
No
Check +12 V line.
Check and replace IC102 (19": IC101).
Check +80 V line.
No
Check and replace IC105
(19":IC102) and components
around IC105 (19":IC102).
No
Check D598, D599 and G2 wire.
Check CN102 wire Assy.
5 Troubleshooting
WAVEFORMS
CRT Socket, Red, Green, Blue
15
5-9