No Video - Samsung PN22N Series Service Manual

5-1-16 No Video

Check signal cable and connection.
IC101 Pin 1, 3 and 5
34
inputs are right?
Yes
IC101 Pin 17, 21 and 23
37
outputs are right?
Yes
IC102 Pin 2, 6 and 11
46
outputs are right?
Yes
Cathode DC levels are right?
Yes
G2 voltage is right?
Yes
Change CRT.
Done.
PN22N*
No
Check D_SUB and BNC.
No
2
Check I C bus and +12 V line.
No
Check +12 V line.
Check and replace IC102.
No
Check +80 V line.
Check and replace IC150.
No
Check G2 wire,
CRT Socket board and FBT.
5 Troubleshooting
WAVEFORMS
34 IC101 #1, 3, 5
CH1 RMS =3.475V
IC101 #17, 21, 23
37
CH1 RMS = 1.969 V
46 IC102, #2, 6, 11
CH1 RMS = 2.896 V
5-9