Video - NEC N9902-1 Service Manual

4. NO VIDEO
NO VIDEO
YES
CHECK
SCREEN CONTROL
CLOCKWISE
YES
CHECK
U201 PIN 2, 6, 11
SIGNAL LEVEL
YES
CHECK
U201 PIN 29, 32, 35
SIGNAL LEVEL
YES
CHECK
U203 PIN 1, 3, 5
SIGNAL LEVEL
YES
CHECK
CATHODE VIDEO
LEVEL
YES
TROUBLE IN CRT
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NO
NO
NO
NO
NO
21
REFER
NO RASTER
TROUBLE IN
R/G/B SIGNAL,
SIGNAL CABLE
TROUBLE IN U201
CLAMP(PIN 19)
U201 12V VOLTAGE
TROUBLE IN U203
8V, 12V, 80V VOLTAGE
TROUBLE IN U203
R220, R240, R260