ViewSonic E90fB-4 Service Manual page 24

6-5-1.ABNORMAL HORIZONTAL WIDTH OF VIDEO
READJUST H-WIDTH FUNCTION
CHECK FBT B+ VOLTAGE
ABOUT 62V AT FH=31KHz
CHECK THE HV OF
CRT ABOUT 25KV
6-5-2.ABNORMAL HORIZONTAL LINEARITY
CHECK L401, Q426, Q420, Q427
AND IC101 PIN9,10,11
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6-5 ABNORMAL HORIZONTAL DEFLECTION
NG
OK
NG
OK
CHECK THE RELATIVE CIRCUIT
OFQ406
CHECK THE RELATIVE
CIRCUIT OF SMPS.
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E90fB-4