13 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
 		VOLTAGE
STBY 7V (BY IC804) A-Board TPP9
 		7.5 ± 0.6V
MAIN 9V (BY IC875) A-Board TPA7
 		9.0V ± 0.5V
MAIN 5V (BY IC871) A-Board TPA8
 		5.0V ± 0.3V
GC 2.5V (BY IC872) A-Board TPA9
 		2.5V ± 0.2
STBY 3.3V (BY A1 CONNECTOR) A-Board TPA16
 		3.3V ± 0.2V
D-BOARD
 		VOLTAGE
+B2 (BY D2 CONNECTOR) D-Board TPD144
 		144.0 ± 1.5V
25V (BY D40 CONNECTOR) D-Board TPD250
 		27.5 ± 2.0V
15V (BY D4 CONNECTOR) D-Board TPD150
 		15.7 ± 1.5V
-15V (BY RL451) D-Board TPD151
 		-16.0V ± 1.5V
SOUND+ (BY D4 CONNECTOR) D-Board TPD160
 		16.5V ± 1.0V
SOUND- (BY D4) D-Board TPD161
 		-16.5V ± 1.0V
220V (BY D2 CONNECTOR) D-Board TPD7
 		215V ± 5.0V
12V (BY IC433) D-Board TPA6
 		12V ± 0.5V

High voltage check

  1. Select an active TV channel and confirm that horizontal is in sync.

  2. Adjust BRIGHTNESS and PICTURE using PICTURE icon menu so video just disappears.

  3. Confirm B+ 144 ± 1.5V is within limit.

  4. Using a high voltage meter confirm that the high voltage is 33.0 ± 1.0kV


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