Sony bg2t chassis kv-tg21m81 Service Manual

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FOCUS adjustment should be completed before W/B adjustment.
1. Receive digital monoscope pattern.
2. Set "Picture Mode" to "DYNAMIC".
3. Adjust focus VR so that the center of screen becomes

just  focus.

4. Change the receiving signal to white pattern and blue back.
5. Confirm magenta ring is not noticeable. Incase magenta is

very obvious, adjust focus VR to take balance of magenta
ring and focus.

1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the CV board cathode to the

oscilloscope.

4) Adjust BRIGHTNESS to obtain the cathode voltage to the

value below.

5) Adjust G2 (screen) on the FBT until picture shows the point

before cut off.

0 V

Cathode setting voltage:

175 V 

± 2 (VDC)

2.a). WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 4-1: ADJUSTMENTS

WITH COMMANDER).

2) Input white raster signal.
3) Set 49 (ABL) and IF (VP2) service mode to 00.
4) Set Picture to DYNAMIC.
5) Select OB (RDR) with [1] and [4], and set the level to 25

with [3]  and [6] for best white balance.

6) Select OC 'GDR' and OD 'BDR' with [1] and [4], and adjust

the level with [3] and [6] for the best white balance.

7) Write into the memory by pressing [MUTING] then [0].
8) Set back 49 'ABL' and IF 'VP2' service mode to original data.

2.b). SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Set 49(ABL) and IF (VP2) service mode to 00
3) Input a staircase signal of black to white from the pattern

generator.

4) BRIGHTNESS .... 50%.

PICTURE ............ MINIMUM

5) Select OE (SBR) with [1] and [4], and adjust OE (SBR) level

with [3] and [6] so that the second stripe from the right is
dimly lit.

6) Write into the memory by pressing [MUTING] then [0].
7) Set back 49 (ABL) and IF (VP2) service mode to original data.

White

second from the right

Black

FOCUS

SCREEN

a

d

c

b

a to d : Permalloy assembly

Fix a Permalloy assy
corresponding to the
misconverged areas

b

a

c

d

a-d : screen-corner
        misconvergence