ViewSonic P90F Service Manual download pdf (Page 24)

Brightness control: Pin 2 of IA01 provides Brightness control. It feed through P903 to base of

Q960 to vary R, G, B bias at cathodes simultaneously.

8-7 Convergence circuit

Pin1 of IA01 provides a voltage (0 to 5V) to Q426, Q427, and Q428, then drive the Horizon.

convergence coil of deflection yoke through P420..

Pin39 of IA01 provides a voltage (0 to 5V) to Q305, Q306, and Q307, then drive the vertical

convergence coil of deflection yoke.

8-8 Purity circuit

PWB-0417 provides purity control on four corners of CDT.

Through IIC bus (pin 27, 28 of IA01), IA01 communicate with I501 on purity board. I501 is a

digital to analog converter. There are four controls on corners of CDT. User can adjust the white

uniformity and color uniformity at four corners.

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ViewSonic P90F Service Manual Page 24