Samsung CF21M Service Manual page 52

5-1-4 H_Deflection Failure
IC402 Pin 6 waveform is right?
2
Yes
Q454 drain
3
waveform is right?
Yes
Q401 gate, drain
4
5
waveforms are right?
Yes
Q402 base, collector
6 7
waveforms are right?
WAVEFORMS
IC402, #6
2
CH1 P-P = 10.96 V CH1 RMS = 6.180 V
Q401, Drain
5
CF21M*
1. Appear the Voltage 12V
No
IC402 Pin 7 replace R451.
2. Check IC402 Pins 6~5, 7~6.
3. Replace IC402.
No
No
No
Check and replace D402 and Q402.
Check DY connector connection.
Q454, Drain
3
Q402, Base
6
at
DC
Check Q451, Q452, Q453,
ZD450, R467, D456.
Check Q250, Q251, IC250
Check +19V line.
Q401, Gate
4
CH1 P-P = 11.6 V CH1 RMS = 6.944V
Q402, Collector
7
5 Troubleshooting
5-3