Panasonic TX-43P250 / TX-51P250 / TC-43P250 / TC-51P250 Service Manual ▷ View online
3.10. Disassembly For CRT Removal
To facilitate CRT replacement, the complete CRT mounting
chassis does not need to be removed.
chassis does not need to be removed.
1. Remove the Screen Frame Ass´y, Decorative Panel and
the Bottom Rear Cover Ass´y. ( See Disassemble for
Service ).
Service ).
2. From the Rear side, remove the defective CRT´s anode
lead from the Flyback Transformer block that is mounted
secured to the Main chassis E-Board.
secured to the Main chassis E-Board.
3. Grasp the anode lead protective cap body inside, and rotate
1/4 turn counter clockwise and pull anode lead sleeve out of
the distributor.
the distributor.
4. Discharge anode lead to CRT chassis metal frame.
5. Unplug the defective CRT Dag ( GND ), from the CRT
Board, LBGND for LB, LGGND for LG, LRGND for LR.
6. Remove lead wires ( DY, VM coil ) and anode lead wire
from holders as necessary.
7. Remove the CRT Board from the defective CRT neck.
8. Note position of yoke with centering tabs and remove from
defective CRT.
9. From the Top, remove (2) screws from the defective CRT.
10. Release CRT anode lead from CRT chassis wire clamp and
all other wires from holders.
11. Wire the anode lead wire.
12. Lift out CRT assembly with lens assembly and other CRT
neck assemblies.
13. Lay CRT face down on a soft cloth.
14. Remove CRT lens by removing (4) screws.
15. Install yoke and VM coil with other CRT neck assemblies on
CRT neck in the same order and position as removed from
the defective CRT.
the defective CRT.
16. Push yoke against bell of CRT and tighten the clamp just
snug enough so it will not easily shift.
17. Assemble CRT focus lens assembly to new CRT with (4)
screws. Make sure focus lens adjustment nut is in the same
location as on other CRT focus lens.
location as on other CRT focus lens.
Note:
Please assemble with screws in the order shown in detail
and tighten with same torque.
and tighten with same torque.
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TX-43P250 / TX-51P250 / TC-43P250 / TC-51P250
4.1.
Service position for Main
chassis
chassis
1. Remove the Rear Cover (Bottom) by removing (19) screws
around its perimeter.
2. Remove lead wires and bundles from holders as necessary.
3. Pull out main chassis and stand it.
4.2.
Service Position for DG-Board
1. Remove the each circuit board from A or D-Board.
2. Connect extension cables between individual circuit board
and A or D-Board.
Note:
Extension cable kit is supplied as service fixtures and tools.
(Part No. TZSC0724)
(Part No. TZSC0724)
4.3.
Service Position for M-Board
1. Remove the Top Cabinet Ass´y.
2. Remove M-Board by removing (3) screws.
4 Service Hints
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TX-43P250 / TX-51P250 / TC-43P250 / TC-51P250
5 Self Check
1. Self-Check is used to automatically check the bus lines and hexadecimal code of the TV set.
2. To get into the Self -Check mode press the down (
) button on the customer controls at the front of the set, at the same
time pressing the HELP button on the remote control, and the screen will show :
If the CCU ports have been checked and found to be incorrect or not located then “--” will appear in place of “O.K.”.
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TX-43P250 / TX-51P250 / TC-43P250 / TC-51P250
6 Service Mode Function
MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can be
adjusted by remote control in Service Mode.
adjusted by remote control in Service Mode.
6.1.
How to enter SERVICE 1
1. In sound menu, set BASS to MAX, and set TREBLE to MINIMUM.
2. Simultaneously press INDEX button on remote control and VOLUME DOWN button [ - ] on the TV set.
6.2.
How to enter SERVICE 2
1. Set the channel to CH99.
2. Press HOLD button on remote control.
Note:
To exit to Service mode, press N or Power button on remote control.
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TX-43P250 / TX-51P250 / TC-43P250 / TC-51P250
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