Sony KV-29FQ65B Service Manual ▷ View online
17
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
18
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
19
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
20
•
When complete readjustment is necessary or a new picture tube is
installed, carry out the following adjustments.
installed, carry out the following adjustments.
•
Unless there are specific instructions to the contrary, carry out
these adjustments with the rated power supply.
these adjustments with the rated power supply.
•
Unless there are specific instructions to the contrary, set the
controls and switches to the following settings :
controls and switches to the following settings :
Contrast
.................................. normal
Brightness .................................. normal
Preparation :
1.
In order to reduce the influence of geomagnetism on the set’s
picture tube, face it in an easterly or westerly direction.
picture tube, face it in an easterly or westerly direction.
2.
Switch on the TV set’s power and degauss with a degausser.
(1) Adjustment of Correction Magnet for Y-Splitting Axis.
1.
Input a crosshatch signal from the pattern generator.
2.
Set the Picture control to minimum and confirm that the
Brightness control is set to normal.
Brightness control is set to normal.
3.
Position the neck assembly as indicated in Fig.3-2.
4.
Loosen the deflection yoke fixing screw.
5.
Move the deflection yoke as far forward as is possible.
6.
Adjust the upper and lower pin symmetrically by opening or
closing the Y-splitting axis correction magnets located on the neck
assembly. [See Fig 3-3]
closing the Y-splitting axis correction magnets located on the neck
assembly. [See Fig 3-3]
7.
Return the deflection yoke to its original position and re-tighten its
fixing screw.
fixing screw.
Carry out the adjustments in the following order :
3-1.
3-1.
Beam Landing.
3-2.
Convergence.
3-3.
Focus.
3-4.
White Balance.
Note : Test equipment required.
1.
Color bar/pattern generator.
2.
Degausser.
3.
Oscilloscope.
4.
Digital multimeter.
Fig.3-1
(2) Landing
Note : Before carrying out the following adjustments adjust the
magnets as indicated below [See Fig.3-4].
1.
Input a crosshatch signal from the signal generator.
2.
Rough-adjust the focus and horizontal convergence.
3.
Switch from the crosshatch pattern to an all-red pattern.
4.
Move the deflection yoke backwards and adjust with the purity
magnet so that the red is at the centre and it aligns
symmetrically [See Fig.3-5].
magnet so that the red is at the centre and it aligns
symmetrically [See Fig.3-5].
5.
Move the deflection yoke forward to the point where the entire
screen just becomes red [Mark its position].
screen just becomes red [Mark its position].
6.
Move the deflection yoke further forward until the screen just
changes colour at the edges. [Mark its position]
changes colour at the edges. [Mark its position]
7.
Position the deflection yoke between the two marks indicated
above.
above.
8.
Input a crosshatch pattern from the pattern generator and rotate the
deflection yoke so that the horizontal lines are parallel with the top
and bottom of the screen.
deflection yoke so that the horizontal lines are parallel with the top
and bottom of the screen.
9.
When the position of the deflection yoke has been determined,
fasten it with its fixing screw.
fasten it with its fixing screw.
10. Switch the pattern generator to green then blue and confirm the
purity.
11. If the beam does not land correctly in all the corners of the screen,
use disk magnets to correct it. [Confirm the corner landing for
green and blue]
green and blue]
SECTION 3
SET-UP ADJUSTMENTS
3-1. Beam Landing
Caution :
High voltages are present on the Deflection yoke terminals - take care
when handling the Deflection yoke whilst carrying out adjustments.
when handling the Deflection yoke whilst carrying out adjustments.
Y-splitting axis correction magnet
Fig.3-3
Fig.3-2
Neck assy
Align the edge
of the neck assy with
the edge of the G2 grid
on the G3 side.
of the neck assy with
the edge of the G2 grid
on the G3 side.
G2
G1
G3
+
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