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Model
PT-VW355N PT-VW355ND T-VW355NT PT-VX425N PT-VX425ND PT-VX425NT (serv.man2)
Pages
110
Size
23.75 MB
Type
PDF
Document
Service Manual
Brand
Device
Projector / LCD PROJECTOR
File
pt-vw355n-pt-vw355nd-t-vw355nt-pt-vx425n-pt-vx425n.pdf
Date
PREV: Panasonic PT-VW355N / PT-VW355ND / T-VW355NT / PT-VX425N / PT-VX425ND / PT-VX425NT Service Manual / Parts change notice

Panasonic PT-VW355N / PT-VW355ND / T-VW355NT / PT-VX425N / PT-VX425ND / PT-VX425NT (serv.man2) Service Manual ▷ View online

INF-21
SECTION 1 SERVICE INFORMATION
■ No picture or abnormal picture is output 
Confirm each cable connection
Connect the cables securely
Confirm the below with a signal other than all black pattern.
No picture with VIDEO input
Follow the section "VIDEO input check"
No picture with RGB1 input
Follow the section "RGB1 input check"
No picture with RGB2 input
Follow the section "RGB2 input check"
No picture with S-VIDEO input
Follow the section "S-VIDEO input check"
No picture with HDMI input
Follow the section "HDMI input check"
No picture with COMPONENT input
Follow the section "COMPONENT input check"
No picture with MIRRORING input
Follow the section "MIRRORING input check"
No picture with all of inputs
A
Check each power supply voltage of microprocessor IC(IC301), 
Keystone IC (IC2301), TTL2LVDS IC(IC2302), Digital Gamma IC 
(IC501), S&H IC (IC561).
NG
A
Check IC301, IC2301, IC2302, IC501, IC561 and periph-
eral circuits
A
Check the waveform (LDVS output clock) at R401 on IC2302 
(TTL2LVDS) circuit
NG
A
Check IC2302(TTL2LVDS) and peripheral circuit
A
Check the waveform (TTL output signal) at VSIR[1-12], VSIG[1-
12], VSSIB[1-12] on IC561 (S&H) circuit
NG
A
Check IIC561 (S&H) and peripheral circuit
A
Check the waveform (TTL output clock) at R322 on IC301 (Mi-
croprocessor) circuit
NG
A
Check IC301(Microprocessor) and peripheral circuit
A
Check the waveform (LDVS output clock) at TXCK1_P, 
TXCK1_N, TXCK2_P, TXCK2_N on IC501 (Digital Gamma) 
circuit
NG
A
Check IC501(Digital Gamma) and peripheral circuit
A
Check the connection of connectors [K5R], [K5G], [K5B]
NG
A
Connect the connectors securely
A
Replace [A] P.C.Board
(3)
OK
OK
OK
OK
OK
OK
OK
INF-22
SECTION 1 SERVICE INFORMATION
■ VIDEO input check 
■ RGB1 input check 
Check the cable between [A]-P.C.Board and [K300]
NG
Replace cable
A
Check the sync input waveform at R344, R347, R353
NG
A
Check R344, R347, R353 and peripheral circuits
A
Check the waveform at each pin of connector [K10A]
NG
A
Check connector [K10A] and peripheral circuit
J
Check the waveform at pin 5 of [K50A]
NG
J
Replace [J] P.C.Board
A
Check IC301 and peripheral circuits
A
Check microprocessor (IC301) and peripheral circuits
One of the inputs (S-VIDEO, HDMI, RGB1, RGB2, COMPO-
NENT) can be displayed
NG
One of the inputs (S-VIDEO, HDMI, RGB2, COMPONENT) can 
be displayed
NG
(3)
(3)
OK
OK
OK
OK
OK
OK
■ RGB2 input check 
A
Check the sync input waveform at R8101, R8201, R8015
NG
A
Check R8101, R8201, R8015 and peripheral circuits
A
Check the waveform at each pin of connector [K10B]
NG
A
Check connector [K10B] and peripheral circuit
A
Check microprocessor (IC301) and peripheral circuits
One of the inputs (S-VIDEO, HDMI, RGB1, COMPONENT) can 
be displayed
NG
(3)
OK
OK
OK
INF-23
SECTION 1 SERVICE INFORMATION
■ HDMI input check 
■ COMPONENT input check 
A
Check the waveform at IC8001 surrounding circuit
NG
A
Check IC8001 and peripheral circuits
Check the waveform at each pin of connector [K10A]
NG
A
Check connector [K10A] and peripheral circuits
A
Check the sync input waveform at R344, R347, R353, R2807
 
A
Check R344, R347, R353, R2807 and peripheral circuits
A
Check microprocessor (IC301) and peripheral circuits
A
Check microprocessor (IC301) and peripheral circuits
One of the inputs (VIDEO, S-VIDOE, RGB1, RGB2, COMPO-
NENT) can be displayed
NG
One of the inputs (VIDEO, S-VIDEO, RGB1, RGB2, HDMI) can 
be displayed
NG
(3)
(3)
OK
OK
OK
OK
OK
■ S-VIDEO input check 
A
Check the cable between [A]-P.C.Board and [K300]
NG
A
Replace cable
A
Check the waveform at pin (4) of connector [K20B]
NG
J
Replace [J]-P.C.Board
A
Check microprocessor (IC301) and peripheral circuits
One of the inputs (VIDEO, HDMI, RGB1, RGB2, COMPONENT) 
can be displayed
NG
(3)
OK
OK
OK
INF-24
SECTION 1 SERVICE INFORMATION
■ [A] P.C.Board operation check 
A
Check the clock waveform around IC301.
 
X1331 : 27MHz
A
Check IC301, X1331 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
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
NG
NG
NG
NG
NG
NG
NG
■MIRRORING input check 
MIRRORING input can be displayed
NG
NT
Check IC8501 and peripheral circuits
NT
Check [IC8501,K8802] and peripheral circuits
One of the inputs (VIDEO, RGB1, RGB2, COMPONENT) can be 
displayed
NG
(3)
OK
OK
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