Abnormal Vertical Scanning - ViewSonic E90fB-4 Service Manual

6-6-1. ABNORMAL VERTICAL SIZE
READJUST V-SIZE FUNCTION VALUE
CHECK THE IC601 PIN1 ABOUT 11.8V
PIN 4 ABOUT -12V
CHECK VERT. OSC CIRCUIT
READJUST V-SIZE FUNCTION VALUE
6-6-2. VERTICAL CENTER
READJUST V-CENTER
READJUST
READJUST FOCUS CONTROL
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6-6 ABNORMAL VERTICAL SCANNING

NG
OK
NG
OK
NG
6-7 . SIDE-PIN CUSHION DISTORTION
NG
NG
22
CHECK D601, C605
RELATIVE CIRCUIT
CHECK THE VOLTAGE OF IC101
RELATIVE CIRCUIT
NG
CHECK IC101 PIN33,34
RELATIVE CIRCUIT
CHECK IC101 AND IC601
RELATIVE CKT
CHECK IC101, Q406
RELATIVE CKT.
6-8 . POOR FOCUS
CHECK FOCUS CONTROL UNIT,
FOCUS LEAD WIRE, CRT SOCKET & CRT
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E90fB-4