KP-43T90, KP-48V90, KP-53V90, KP-61V90 - Sony TV Service Manual (repair manual). Page 13

1. Select a video input with no signal applied (the screen must be black, 

and the room must be as dark as possible.  You may use a heavy 
blanket over the screen to block out ambient light).

2. Select picture mode “Personal 1” or “Personal 2”, and set 

BRIGHTNESS to 50% and PICTURE to minimum.

3. Turn the green SCREEN control on the focus block all the way to 

the left and then gradually turn it to the right until the retrace line is 
barely visible.

4. Gradually turn the control to the left until the retrace line just 

disappears.

5. Repeat steps 1 through 4 for the red and blue CRTs.

      

 

R

G

B

SCREEN

R

G

B

FOCUS

      

 

 

FOCUS block

If the jig described below is available, it is recommended that the G2 Fine 
Mode Adjustment be performed to set the screen controls to their optimal 
condition.   If desired, you can build the jig illustrated below, using 3-watt 
resistors.  Please note that if the proper voltage is not obtained with the 
listed resistor’s values, then increase or decrease one of the values in 
the resistor network to obtain the correct voltage.

1. Select VIDEO-1 mode no signal applied (the screen must be black).

2. Connect the G2 JIG.

3. Switch on the JIG.

4. Connect an oscilloscope to the TP701(KR), TP732(KG) and 

TP761(KB) of CR board, CG board and CB board.

5. Adjust red, green, and blue screen voltage to 168-172V with SCREEN 

controls on the focus block, as shown below.

               

170V +/- 2V

G2 JIG

200V

GND

3.3k

5.6k

5.6k

5.6k

SW

K

GND

pedestal level

 

 

 

    

 

 

          

             

1. Display a cross-hatch pattern

2. Enter the service mode.

3. Cover the red and blue CRT lenses with lens caps to allow only green 

to show (or use the method shown in the note below for turning off the 
CRTs individually without using lens caps).

4. Loosen the green CRT’s defl ection yoke set screw and align the tilt 

of the defl ection yoke so that the horizontal bars at the center of 
the cross-hatch pattern are parallel to the top and bottom edges of 
the screen. 

5. After aligning the defl ection yoke fasten it securely, making sure it is 

fully forward on the neck of the CRT.

6. The tilt of the defl ection yoke for red and blue are aligned the same 

way as the green CRT.  

  Cover the green and blue CRT lenses with lens caps (or use the 

method shown in the note below for turning off the CRTs individually 
without using lens caps), then repeat steps 4 and 5 for the red CRT.  

  Cover the green and red CRT lenses with lens caps (or use the 

method shown in the note below for turning off the CRTs individually 
without using lens caps), then repeat steps 4 and 5 for the blue CRT.

Note: If lens caps are unavailable, you can cut off the unnecessary color 
beams in the service mode by individually changing the data from “1” 
to “0” in category VPNT, item 28 RON (red), item 29 GON (green), or 
item 30 BON (blue).

    

   

 

   

2-pole magnet

4-pole magnet

Deflection yoke

Anode cap