Sony KV-28FQ75A Service Manual ▷ View online
17
2-4. Service Position
2-5. D1 Board Removal
2-6. J Board Removal
To remove the D1 Board release the clip circled and gently
remove the board in a vertical direction.
remove the board in a vertical direction.
Position the PWB as indicated to access the solder side.
To gain access to the D Board follow the instructions on page
19. [Removal and Replacement of the main bracket bottom
plates ].
To gain access to the D Board follow the instructions on page
19. [Removal and Replacement of the main bracket bottom
plates ].
Release the two metal bracket support clips located on either
side of the chassis. Tilt the bracket very slightly away from the
shield case indicated. Release the J board board socket
retaining clip and carefully lift the complete assembly verti-
cally.
side of the chassis. Tilt the bracket very slightly away from the
shield case indicated. Release the J board board socket
retaining clip and carefully lift the complete assembly verti-
cally.
2-7. B3 Board Removal
Follow the steps indicated in removal of the J board. With the
assembly removed access to the B3 board shield is possible. To
remove the shield locate and remove the two screws positioned on
either side and at opposite ends of the shield. Release the B3 board clip
and remove in a vertical direction. Please ensure that the screws are
refitted after service.
assembly removed access to the B3 board shield is possible. To
remove the shield locate and remove the two screws positioned on
either side and at opposite ends of the shield. Release the B3 board clip
and remove in a vertical direction. Please ensure that the screws are
refitted after service.
Clip
Shield
case
case
Screw
Note :
Removal of the B3, E, and M1 printed circuit boards follows the
same procedure of releasing the securing clips as indicated
in the fig for D1 board removal.
Take care not to apply to great a pressure to the clips as this may
cause damage.
Removal of the B3, E, and M1 printed circuit boards follows the
same procedure of releasing the securing clips as indicated
in the fig for D1 board removal.
Take care not to apply to great a pressure to the clips as this may
cause damage.
18
2-8. Front Control Module Removal
2-9. F3 and H6 Board Removal
To remove the F3 and H6 Boards release the clips circled and
ease the boards gently away from the main support bracket.
ease the boards gently away from the main support bracket.
Clips
2-10. H5 Board Removal
To remove the H5 Board, first remove the control door from
bracket by releasing the clips circled and pushing them
through the main support bracket.
bracket by releasing the clips circled and pushing them
through the main support bracket.
Clips
Removal of H5 Board follows the same procedure as removal
of the F3 and H6 Boards.
of the F3 and H6 Boards.
Remove the two screws fixing the user control module to the
front underside of the set. The control module drops down to
allow access to the boards.
front underside of the set. The control module drops down to
allow access to the boards.
Screws
2-11. Service Connector for H5 Board
If there is a requirement to use the front video and audio
sockets when the chassis is placed in its service position, it
would be necessary to use an extender board and extension
cable as indicated below.
sockets when the chassis is placed in its service position, it
would be necessary to use an extender board and extension
cable as indicated below.
The Extender board and extension cable are available as a
service part by ordering the part number as indicated.
service part by ordering the part number as indicated.
From H5 Board
To CN 1703 on
A Board
A Board
Extender board assembly A-1647-037-A
19
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.
if the shatter hook sticks out.
Removal of the Anode-Cap
2-12. 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 tentioners.
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
20
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 Board printed wiring board,
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 3 plates fitted to the main bracket and secured by3 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.
For safety reasons, on no account should the plates be
removed and not refitted after servicing.
removed and not refitted after servicing.
£
Tab
Catch
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