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12 Chassis service adjustment procedures
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All service adjustments are factory preset and should not require adjustment unless controls and/or
associated components are replaced.
140.0_V B+ voltage check
1. Set the BRIGHT and PICTURE to minimum by using the PICTURE menu.
2. Connect the DVM on TPD144 (D-Board by D2 connector) and cold ground
3. Confirm that B+ voltage is 144.0V ± 1.5V. This voltage supplies B+ to the horizontal output
and flyback circuits.
Source voltage chart
120V AC line input. Set the BRIGHT and the PICTURE to minimum by using the PICTURE menu.
Use cold or hot ground for the (-) lead of the DVM as needed
A-BOARD
STBY 7V (BY IC804) A-Board TPP9
MAIN 9V (BY IC875) A-Board TPA7
MAIN 5V (BY IC871) A-Board TPA8
GC 2.5V (BY IC872) A-Board TPA9
STBY 3.3V (BY A1 CONNECTOR) A-Board TPA16 3.3V ± 0.2V
D-BOARD
+B2 (BY D2 CONNECTOR) D-Board TPD144
25V (BY D40 CONNECTOR) D-Board TPD250
15V (BY D4 CONNECTOR) D-Board TPD150
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VOLTAGE
7.5 ± 0.6V
9.0V ± 0.5V
5.0V ± 0.3V
2.5V ± 0.2
VOLTAGE
144.0 ± 1.5V
27.5 ± 2.0V
15.7 ± 1.5V