Panasonic PT-VW350 / PT-VW350D / PT-VW350T / PT-VX420 / PT-VX420D / PT-VX420T / PT-VX421 (serv.man4) Service Manual ▷ View online
INF-27
SECTION 1 SERVICE INFORMATION
■ Built-in speaker check
■ AUDIO OUT check
J
Check the waveform at pins 1 and 3 of connector [K8F]
NG
J
Check IC001 and peripheral circuits
[ANALOG]
Check the cable connection between [A]-P.C.Board and con-
nector [K300]
nector [K300]
NG
Replace cable
Replace speaker
J
Replace [J]-P.C.Board
J
Replace [J]-P.C.Board
A
Replace [A]-P.C.Board
OK
OK
OK
OK
INF-28
SECTION 1 SERVICE INFORMATION
DIS-1
CONTENTS
SECTION 2 DISASSEMBLY PROCEDURES
Disassembly Procedures
Model No. PT-VW350
PT-VX420
PT-VX421
SECTION 2 DISASSEMBLY PROCEDURES
1. Parts Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIS-2
1.1. Electrical parts location (P.C.Boards)
1.2. Electrical parts location (Fans)
2. Mechanical and Electrical Parts Disassembly . . . . . . . . . . . . . . . . . .
DIS-3
2.1. Disassembly flow chart
2.2. Air filter unit removal
2.3. Top cover and front cover removal
2.2. Air filter unit removal
2.3. Top cover and front cover removal
2.4. [A]/[J]-P.C.Board assy removal
2.5. Lamp intake fan, lamp, lighting assy removal
2.6. [K]-P.C.Board, lamp exhaust fan assy removal
2.7. Power box assy and speaker box removal
2.8. Panel A/B intake fans and duct panel assy removal
3. Optical Parts Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIS-10
3.1. Disassembly flow chart
3.2. Projection lens and optical block assy removal
3.2. Projection lens and optical block assy removal
3.3. Polarizer-out replacement
3.4. Polarizer-in assy removal
3.5. Condenser lens-out removal
3.6. PBS and integrator lenses removal
3.7. Lighting case cover removal
3.8. Parts location and direction in the lighting case
<Cable reforming> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIS-18
(2015-05)
DIS-2
SECTION 2 DISASSEMBLY PROCEDURES
1. Parts Locations
1.1. Electrical parts location (P.C.Boards)
1.2. Electrical parts location (Fans)
J
M1
M2
K
A
C
R
BQ
P
Lamp intake fan
Power exhaust fan
Lamp exhaust fan
Panel A intake fan
Panel B intake fan
Board name
Function summary
Board name
Function summary
A
Image processingsystem / CPU
P
Power supply
J
Signal input terminals
BQ
Ballast power / Ballast control
K
Line Filter
M1
Air flow sensor
M2
Temperature sensor (Intake air)
R
Remote control receiver
C
Lamp memory connection
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