DOWNLOAD Sony KP-FWS57M31 / KP-FWS57M91 Service Manual ↓ Size: 14.21 MB | Pages: 127 in PDF or view online for FREE

– 13 –

8

 D board

6

 A board

Main  bracket section

5

 Five screws

     (BVTP 3x12)

7

 Six screws

     (BVTP 3x12)

4

 G1 bracket

2

 G1 board

1

 Two screws

     (BVTP 3x12)

3

 Three screws

     (BVTP 3x12)

Main  bracket section

2

 BM board

1

 MG Board

5

 MS2 board

7

 DS board

4

 Three screw

     (BVTP 3x12)

3

 Shield case

6

 Screw

     (BVTP 3x12)

– 14 –

(1) Remover

(2) Installation

1 Rubber cap

2 HV cable turn 90

°

2 Rubber cap

1 HV cable

Hook

5

 PWB block assy

3

 Picture tube block assy

2

 Three screws

      (Hexagon head)
      (4X20)

2

 Three screws

      (Hexagon head 4X20)

4

 Two screws

     (Hexagon head 4X20)

1

 Two screws

(BVTP 4X16)

1

 Two screws

(BVTP 4X16)

– 15 –

1 Four screws
     (BVTP 4X16)

8 Two screws  (BVTP 4X16)

6 Four screws
     (BVTP 4X16)

Removing the arrow-marked screw is strictly inhibited.
If removed, it may cause liquid spill.

2 CR board

3 VMcoil assy

4 VM board

7 Mechaseal assy (R)

5 Deflection yoke

9 Shading (R)  (Red only)

8 Screw  (BVTP 4X16)

6 Four screws
     (BVTP 4X16)

7 Mechaseal assy (G)

9 Shading (G)  (Green only)

8 Screw  (BVTP 4X16)

9 Shading (B)  (Blue only)

6 Four screws
     (BVTP 4X16)

7 Mechaseal assy (B)

BLUE

GREEN

RED

2 CR board

3 VMcoil assy

4 VM board

5 Deflection yoke

2 CR board

3 VMcoil assy

4 VM board

5 Deflection yoke

– 16 –

1. Receive the Monoscope signal.
2. Set 50% BRIGHTNESS and minimum PICTURE.
3. Turn the red VR on the focus pack all the way to the left and

then gradually turn it to the right until the point where you can
see the retrace line.

4. Next gradually turn it to the left to the position where the

retrace line disappears.

1. Turn on the power of the set.
2. Select VIDEO1 and make no signal input.
3. Supply DC (177.5 

± 0.5V) from external power supply to KR

(Fig.3-2).

3. Turn red of G2 VR clockwise, then retrace line appear.
4. Turn G2 VR counterclockwise and set retrace line just

disappear (Fig.3-3).

5. Add DC voltage DC (174 

± 0.5V) to KR.

6. Confirm if retrace can be seen.
7. Adjust green and blue at the same method.

1. Connect VIDEO-1 terminal.
2. Receive video dot hatch pattern.
3. Use lens-cover to red and blue.

VMcoil Assy

Make sure deflection yoke is 
touching CRT closely.

2-pole magnet

4-pole magnet

Deflection yoke

Anode cap

Centering magnet

4. Adjust electric focus (roughly).
5. Rotate the green lens and adjust to obtain the best lens focus.
6. Rotate the green focus volume on the focus pack and adjust to

obtain best electrical focus.

7. If focus is not good, repeat 4 process.
8. Repeat above process for red and blue lenses and electric fo-

cus.

9. Fix lens screw.

1. Receive the Monoscope signal.
2. Place the caps on the red and blue lens so that only the green

color.

3. Loosen the deflection yoke setscrew and align the tilt of the

Deflection yoke so that the bars at the center of the
monoscope pattern are horizontal.

4. After aligning the deflection yoke, fasten it securely to the

funnel-shaped portion of the CRT.

5. The tilt of the deflection yoke for red and blue is aligned the

same as was done for green.

SCREEN

B

R

G

FOCUS

Focus Pack

B

R

G

+

–

Power
Supply

Dummy Resister

3k ohm  20W

Test signal

Lens

Minimize both A and B.

A

B

Scanning line visible.