DOWNLOAD Panasonic TH-42LF20W / TH-47LF20W Service Manual ↓ Size: 7.35 MB | Pages: 52 in PDF or view online for FREE

21

TH-42LF20W / TH-47LF20W

1. Peel off the tape halfway that affixes the FFC cable and

lead wire for the connector board to the rear side of the
LCD panel, and remove them from the rear side of the
panel. (Refer to the wiring connection diagram)

2. Remove the FFC cable (K38I) and the coupler (K38H)

from the connector board.

3. Remove the screw (Qty. 1), and remove the connector

board from the rear side of the LCD panel, and then
replace. (SCR PAN+SW 4X6)

• The 2 lead wires for the inverter (Couplers KIV1 and KIV2),

the black-out tape and the spacer sheet, etc., are supplied
already affixed to the LCD panel.

• The tape that is affixed to the FFC cable and the lead wires

on the connector board are supplied as repair parts. Replace
them at the same time as the LCD panel.

1. Follow the procedure mentioned previously, and remove

the connector board, the FFC cable and the lead wire
from rear side of the LCD panel.

2. Peel off the 2 pieces of aluminum foil tape that are affixed

to and cross over the rear side of the LCD panel and the
upper part of the mounting that connects the cabinet front
and LCD panel.

3. While widening the mounting that connects the cabinet

front and the LCD panel, remove the cabinet front from
the LCD panel. When lifting up the LCD panel, hold the
mounting component.

4. Remove the screws (Qty. 8), and then remove the mount-

ing from the rear side of the LCD panel. (SCR BIN 4X6)

5. (47V type only) Remove the screws (Qty. 2) and then

remove the Power board holder fittings from the rear side
panel. (SCR BIN 4X4)

• The Power board holder fittings are not available in the

repair parts.

6. Replace the LCD panel with the replacement LCD panel.
7. Use 2 pieces of replacement aluminum foil tape and

cover the screw hole on the upper part of the mounting so
it is affixed to and crosses over the mounting top and the
rear side of the LCD panel.

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TH-42LF20W / TH-47LF20W

1. Slide the 2 fittings on the inside of the cabinet front toward

the outside and remove.

2. Remove the FFC cable from the RC+LED board's coupler

(K19I), and replace the board with the replacement
board.

3. When replacing the cabinet front, remove the shield RC

and the DEC LED (clear plate) on the inside.
The gasket is affixed to the shield RC. When replacing,
also replace the gasket.

4. The spacer sheet and the gasket are affixed to the fittings

that hold down the RC+LED board.
When replacing the fittings, also replace the spacer sheet
and the gasket.

• The parts that are necessary for replacement (spacer sheet,

Panasonic badge, etc.) are not included. They are supplied
as replacement parts. Replace them at the same time as the
cabinet front.

1. Remove the spacer sheet that is affixed to the inside of

the cabinet front.

2. Slide off the mounting and remove it from the cabinet

front.

3. Affix the Panasonic badge to the replacement cabinet

front beforehand.

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TH-42LF20W / TH-47LF20W

4. Install the RC+LED board onto the cabinet front.
5. Slide the mounting on and install it onto the cabinet front.
6. Affix the spacer sheet onto the mounting.

7. Install the cabinet front, that is prepared beforehand, onto

the set.

• The parts that are necessary for replacement (DEC button,

DEC AV, etc.) are not included. They are supplied as
replacement parts. Replace them at the same time as the
cabinet back.

1. Remove each board, speaker and fitting from the cabinet

back.

2. Remove the screws (Qty. 4) shown in the illustration, and

remove the terminal holder fitting.
(SCR S-TPG BRZ+FLG 3.0X8.0 V)

3. Remove the screws shown in the diagram, and then

remove the main board holder fitting.
(42V type: Qty. 1 SCR S-TPG BRZ+FLG 3.0X8.0 V)
(47V type: Qty. 3 SCR S-TPG BRZ+FLG 3.0X8.0 V)

24

TH-42LF20W / TH-47LF20W

4. (42 type only) Remove the screws shown in the illustra-

tion, and then remove the Power board holder fitting.
(SCR S-TPG BRZ+FLG 3.0X8.0 V)

5. Affix the DEC button and DEC AV beforehand to the

repair cabinet back.

6. Install the main board holder fitting and the terminal

holder fitting to the replacement cabinet back.

7. Affix 3 pieces of aluminum tape to the metal section of the

main board holder fitting and the terminal holder fitting so
they are connected.

8. Install the replacement cabinet back, that is prepared

beforehand, onto the set.

• The terminal holder fitting, the main board holder fitting,

and the Power board holder are available in the replace-
ment parts.

• Use the gasket with the holder fitting that is affixed as is.
• The type of tape for affixing, in order to set up the lead

wire on the rear side of the cabinet back, is not included.
When replacing the cabinet back, also replace the type
of tape that is used.

When replacing the cabinet back, secure the lead wires
for the speaker and key SW board to the cabinet back
with replacement tape. The circle mark in the picture
below shows where to affix the tape. (Adhesive cloth

tape)

• Affix the tape so the lead wire is sealed tightly onto the

cabinet back. If the lead wire pops up, it may get close to
the board or a high temperature area and cause a chat-
tering noise.

When replacing the button unit that is installed onto the
key SW board, affix a spacer sheet onto the button unit.