No Video - Samsung DP15HS/HT Service Manual

5-1-16 No Video

Check signal cable and connection.
IC101 Pins 5, 8 and 10 inputs
15
are right?
Yes
IC101 Pins 21, 24 and 26
16
outputs are right?
Yes
IC103 Pins 1, 2 and 3 outputs
17
are right?
Yes
Cathode DC levels are right?
Yes
G2 voltage is right?
Yes
Change CRT.
Done.
DP15H*/DP17L*
No
Check the signal cable connection.
No
2
Check I C bus and +12 V line.
No
Check +12 V, +72 V line.
Check and replace IC103.
Check +72 V line.
No
Check and replace QR01, QR02,
QG01, QG02, QB01, QB02.
No
Check G2 wire, CRT Socket board,
and FBT.
5 Troubleshooting
WAVEFORMS
15 1.00 V (IC101, #5, 8, 10)
CH1 P-P = 1.00V CH1 RMS = 2.452V
16 1.00 V (IC101, #21,24,26)
CH1 P-P = 1.00V CH1 RMS = 2.792V
17 20.0 V (IC103, #1, 2, 3)
CH1 P-P = 20.0V CH1 RMS = 40.52V
5-9