12 Chassis service adjustment procedures

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All service adjustments are factory preset and should not require change 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 TPD50 (D-Board by and cold ground

  3. Confirm that B+ voltage is 142V ± 6.0V. 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 IC2201) A-Board TPA9
 		7.5 ± 0.75V
MAIN 9V (BY IC006) A-Board TPA90
 		9.0V ± 0.5V
MAIN 5V (BY IC2301) A-Board TPA15
 		5.2V ± 0.3V
GC 2.5V (BY IC2856) A-Board TPA25
 		2.6V ± 0.2
STBY 3.3V (BY A13 CONNECTOR) A-Board TPA16
 		3.3V ± 0.2V
MAIN 3.3V (BY A21 CONNECTOR) A-Board TPA33
 		3.3V ± 0.2V
MAIN 1.8V (BY IC2451) A-Board TPA18
 		1.8V ± 0.2V

D-BOARD
 		VOLTAGE
+B2 (BYD14 CONNECTOR) D-Board TPD50
 		142.0 ± 6.0V
30V (BY IC807) D-Board TPD19
 		33.5 ± 2.0V
15V (BY IC802) D-Board TPD7
 		14.5 +1.5V -1.0
-15V (BY D9 CONNECTOR) D-Board TPD6
 		-15.5V ± 1.5V
SOUND+ (BY D6 CONNECTOR) D-Board TPD4
 		17.2V +1.5V -1.0
SOUND- (BY D6 CONNECTOR) D-Board TPD53
 		-16.2V +1.5V -1.0
210V (BY IC805) D-Board TPD34
 		211.0V ± 4.0V
MAIN 12V (BY D16 CONNECTOR) D-Board TPD22
 		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+ 142 ± 6.0V is within limit.

  4. Using a high voltage meter confirm that the high voltage is 31.0kV ± 0.3kV


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