Sony KV-28LS65B Service Manual ▷ View online
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2-4. Service Position
2-5. D and G Board Removal
To remove the G Board release the clips circled and ease the
board gently away from the support bracket. Removal of the
D Board follows the same procedure.
board gently away from the support bracket. Removal of the
D Board follows the same procedure.
Position the chassis as indicated to access the solder side.
To gain access to the underside of the boards follow the
instructions on page 16. [Removal and Replacement of the
main bracket bottom plates ].
To gain access to the underside of the boards follow the
instructions on page 16. [Removal and Replacement of the
main bracket bottom plates ].
Clips
2-6. Side Control Module Removal
2-7. H2 Board Removal
Remove the two screws fixing the user control module to the
side of the set. The control module can then be removed by
sliding it towards the rear of the set allowing access to the H2
Board.
side of the set. The control module can then be removed by
sliding it towards the rear of the set allowing access to the H2
Board.
Screws
To remove the H2 Board release the two clips circled and ease
the board gently away from the support bracket.
the board gently away from the support bracket.
2
Clips
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If the M Board needs to be removed for testing when the
chassis is placed in its service position, it would be necessary
to use an extender board and extension cable as indicated
above.
The Extender board and extension cable are available as a
service part by ordering the part number as indicated.
chassis is placed in its service position, it would be necessary
to use an extender board and extension cable as indicated
above.
The Extender board and extension cable are available as a
service part by ordering the part number as indicated.
2-8. M Board Removal
To remove the M Board gently release the two clips with a
screwdriver and remove the board from its socket vertically.
screwdriver and remove the board from its socket vertically.
2-9. Service Connector for M Board
To A
Board
Board
From M
Board
Board
Extender Board Assembly A-1642-293-A
2-10. Wire Dressing
Ensure that wires do not touch heatsinks and high temperature
hotspots. All wires must be kept at a minimum distance of
20mm away from the EHT lead
hotspots. All wires must be kept at a minimum distance of
20mm away from the EHT lead
20mm
20mm
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Anode button
a
* REMOVING PROCEDURES.
Turn up one side of the rubber cap in
the direction indicated by the arrow a
the direction indicated by the arrow a
1
2 Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow b
firmly in the direction indicated by the
arrow b
3 When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling it up in
the direction of the arrow c
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling it up in
the direction of the arrow c
b
b
c
How to handle the Anode-Cap
1.
To prevent damaging the surface of the anode-cap do not use
sharp materials.
sharp materials.
2.
Do not apply too great a pressure on the rubber, as this may cause
damage to the anode connector.
damage to the anode connector.
3.
A metal fitting called a shatter hook terminal is fitted inside the
rubber cap.
rubber cap.
4.
Do not turn the rubber foot over excessively, this may cause
damage if the shatter hook sticks out.
damage if the shatter hook sticks out.
Removal of the Anode-Cap
2-11. Picture Tube Removal
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT even
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
Coated Earth
Ground Strap
Ground Strap
1.
Discharge the anode of the CRT and remove the anode cap.
2.
Unplug all interconnecting leads from the Deflection yoke, neck
assy, degaussing coils and CRT grounding strap.
assy, degaussing coils and CRT grounding strap.
3.
Remove the C Board from the CRT.
4.
Remove the chassis assembly.
5.
Loosen the Neck assembly fixing screw and remove.
6.
Loosen the Deflection yoke fixing screw and remove.
7.
Place the set with the CRT face down on a cushion and remove
the Degaussing Coil holders.
the Degaussing Coil holders.
8.
Remove the Degaussing Coils.
9.
Remove the CRT grounding strap and spring tensioners.
10. Unscrew the four CRT fixing screws [ located on each CRT
corner ] and remove the CRT.
[Take care not to handle the CRT by the neck.]
[Take care not to handle the CRT by the neck.]
1
3
4
6
8
10
5
9
2
7
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REMOVAL AND REPLACEMENT OF THE MAIN
-
BRACKET
BOTTOM PLATES.
(1) REMOVING THE PLATES
In the event of servicing being required to the solder side of the D or G printed wiring boards,
the bottom plates fitted to the main chassis bracket require to be removed.
This is performed by cutting the gates with a sharp wire cutter at the locations indicated by the
arrows.
the bottom plates fitted to the main chassis bracket require to be removed.
This is performed by cutting the gates with a sharp wire cutter at the locations indicated by the
arrows.
Note : There are 2 plates fitted to the main bracket and secured by 3 gates.
Only remove the necessary plate to gain access to the printed wiring board.
(2) REFITTING THE PLATES
Because the plates differ in size it is important that the correct plates are refitted in their original
location.
location.
Please note that the plates need to be rotated 180 degrees from their cut position to allow the
tabs to be fitted into their catch positions.
tabs to be fitted into their catch positions.
Tab
Catch
For safety reasons, on no account should the plates be removed
and not refitted after servicing.
and not refitted after servicing.
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