Read Panasonic PT-VW350 / PT-VW350D / PT-VW350T / PT-VX420 / PT-VX420D / PT-VX420T / PT-VX421 (serv.man4) Service Manual online
INF-24
SECTION 1 SERVICE INFORMATION
■ [A] P.C.Board operation check
■ Main microprocessor check
A
Check the clock waveform around IC301.
X1331 : 27MHz
A
Check IC301, X1331 and peripheral circuits
A
Check the voltage PWR6.0V (DC 6.0V) at pins 6, 7 of connector
[K8R]
[K8R]
A
Replace the cable between [K6R] - [K8R]
Replace [P]-P.C.Board
Replace [P]-P.C.Board
A
Check the voltage (DC 2.6V) at L5851
A
Check IC5851 and peripheral circuits
A
Check the voltage (DC 3.3V) at L5661/L5662
A
Check IC5821 and peripheral circuits
A
Check the clock frequency (27MHz) at R1332
A
Check X1331 and peripheral circuits
A
Check the voltages (DC 3.3V) at pin 6 of IC9885(SUB CPU)
A
Check IC9885 and IC5601 and peripheral circuits
A
Check the voltage (DC 1.8V) at L5868/L5872
A
Check IC5861 and peripheral circuits
A
Check the voltage (DC 3.3V) at pin 3 of IC1341 (RESET)
A
Check IC1341 and peripheral circuits
A
Check IC801 (FLASH ROM) and peripheral circuit.
A
Check IC301 (CPU & RESIZE) and peripheral circuits
A
Check the waveform at IC501 (GAMMA).
A
Check IC501 (GAMMA) and peripheral circuits
A
Check the waveform at IC2301 (KEYSTONE).
A
Check IC2301 (KEYSTONE) and peripheral circuits
A
Check the output waveform at IC301.
A
Check IC301 and peripheral circuits
A
Check the waveform around IC301 with no signal input.
A
Check the connectors K10A and K10B
Check IC8001 and peripheral circuits
Check pins 1 and 2 of K20 and peripheral circuits
Check IC8001 and peripheral circuits
Check pins 1 and 2 of K20 and peripheral circuits
A
Check the waveform at IC561 (S/H).
A
Check IC561 (S/H) and peripheral circuits
A
Check the waveform at IC2302.
A
Check IC2302 and peripheral circuits
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
Click on the first or last page to see other PT-VW350 / PT-VW350D / PT-VW350T / PT-VX420 / PT-VX420D / PT-VX420T / PT-VX421 (serv.man4) service manuals if exist.