No Video - Samsung 753DFX Service Manual

5 Troubleshooting

5-1-16 No Video

Check signal cable and connection.
IC101 Pin 12, 14 and 16 inputs
15
are right?
Yes
IC101 Pin 18, 21 and 24
16
outputs are right?
Yes
IC102 Pin 9, 10 and 11
17
outputs are right?
Yes
Cathode DC levels are right?
Yes
G2 voltage is right?
Yes
Change CRT.
Done.
AN17K*/AN17L*
No
Check the signal cable connection.
No
2
Check I C bus and +12V line.
No
Check +12V, +80V line.
Check and replace IC102.
No
Check +80V line.
Check and replace IC104.
No
Check G2 wire, CRT Socket board
and FBT.
CONFIDENTIAL
WAVEFORMS
1.00V (IC101 #12,14,16)
15
CH1 P-P = 1.00V CH1 RMS = 2.452V
16 1.00V (IC101 #18,21,24)
CH1 P-P = 1.00V CH1 RMS = 2.792V
17 20.0V (IC102, #9, 10, 11)
CH1 P-P = 20.0V CH1 RMS = 40.52V
5-9