ViewSonic G90FB-2 Service Manual download pdf (Page 23)

6-7. Abnormal horizontal linearity

AND IC101 PIN9,10,11

CHECK L401, Q426, Q420, Q427

6-8.

Abnormal vertical size

READJUST V-SIZE FUNCTION VALUE

RELATIVE CIRCUIT

CHECK VERT. OSC CIRCUIT

RELATIVE CIRCUIT

READJUST V-SIZE FUNCTION VALUE

CHECK THE VOLTAGE OF IC101

RELATIVE CIRCUIT

CHECK IC101 PIN33,34

CHECK THE IC601 PIN1 ABOUT 11.8V

PIN 4 ABOUT -12V

CHECK D601, C605

6-9. Vertical center

READJUST V-CENTER

RELATIVE CKT

CHECK IC401 AND IC601

6-10. Side-pin cushion distortion

READJUST FOCUS CONTROL

CHECK FOCUS CONTROL UNIT,

FOCUS LEAD WIRE, CRT SOCKET & CRT

6-11. Poor focus

READJUST FOCUS CONTROL

CHECK FOCUS CONTROL UNIT,

FOCUS LEAD WIRE, CRT SOCKET & CRT

CHECK IC101 AND IC601 RELATIVE

CIRCUIT

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ViewSonic G90FB-2 Service Manual Page 23