KV-21FX250 - Sony TV Service Manual (repair manual). Page 15

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KV-21FX250/21FX250A/21FX250C
KV-21FX250/21FX250A/21FX250C 
15
2-4. SCREEN (G2)
1.  Before beginning adustment procedure:
 
-Set Picture and Brightness to “STANDARD”.
 
-Set TV to Video mode.
 
-Set WHBL 016 “RGBB” to 01
2.  Connect R, G, B of the C Board cathode to oscilloscope.
3.  Adjust Brightness to obtain the cathode value to the value shown 
below:
165
± 2VDC
4.  Adjust SCREEN VR on the FBT until the scanning line disappears.
5.  Set WHBL 16 “RGBB” back to 00.
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