Service manual

3.2 Abnormal Picture
3.2.1 Raster Brightness Failure
Check the screen voltage
.
Expected failure point
T701 (FBT), the CRT socket, or screen leads are failure.
Measure the voltage at CN201 on the CRT PWB.
Usually the screen voltage is 600 to 800V
NG
Expected failure point
The video circuit is failure. (See Item 3.4.5)
OK
3.2.2. Image Color Failure or Contrast Failure
Expected failure point
Signal cable
NG
Expected failure point
The video circuit (See Item 3.4.5)
Check the video signal input.
Measure the voltage at Pins 1(R), 2(G) and 3(B) of CN215 and CN216 on the VIDEO PWB.
Usually, the video input signal is maintained at 0.7Vp-p.
OK
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