Samsung PN19LT/LO, Service Manual

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5 Troubleshooting
5-6 PN19LT/LO/JT/JO
5-1-11 V Deflection Failure
13 V, –10 V line is on?
IC401 Pin 12 output exists?
Check and replace IC401.
Yes
Yes
No
Refer to 5-1-1 No Power Supply
No
IC301 Pin 6 output exists?
Check and replace some parts
around IC301.
Yes
No
Check DY connector connection.
WAVEFORMS
8
9
8 500 V (IC401, #12)
CH1 P-P = 500 V CH1 RMS = 1.425 V
9 10.0 V (IC301, #6)
CH1 P-P = 10.0 V CH1 RMS = 5.06 V
5-1-12 V Size or Pos. Variation Failure
IC401 Pin 12 output varies with
different DAC values?
Yes
Check and replace IC201and IC401.
Check and replace IC301.
No