JVC TH-M508 Service Manual page 12

3.1.8 Removing the main board
(See Fig.11)
• Prior to performing the following procedures, remove the metal
cover, rear panel, audio & digital input board and tuner.
(1) From the top side of the main body, remove the screw Q
attaching the wire protection board to the main board.
(2) Take out the wire protection board, and disconnect the
card wires from the connectors
main board.
Reference:
When attaching the wire protection board, attach the
wire protection board after connecting the card wires to
the connectors (CN401
(3) Disconnect the card wires from the connectors
CN460) on the main board.
(4) Disconnect the parallel wires from the connectors
to CN407, CN456 and CN457) on the main board.
(5) Remove the two screws R and screw R' attaching the main
board on the bottom chassis.
Reference:
When attaching the screw R', attach the earth wire with
it.
(6) Take out the main board from the main body.
1-12 (No.MB294)
(CN401 to CN403) on the
to CN403) on the main board.
(CN450
(CN404
CN460
Earth wire
R'
and
CN450
R
CN403
Main board
Bottom chassis
CN456 Wire protection board
CN457 CN401 CN402
Q
CN404 CN406
CN407 CN405
Fig.11