Read Sharp LC-37GA3E (serv.man8) Service Manual online
40
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
<Signals>
<COMPONENT
, RGB signal> input
No video output (2)
External input in trouble <lNPUT
-1 >
Is Input 1 selected in the input switching
menu screen?
Select Input 1 and the input signal in
the input swltching menu screen.
Is there video signal input at each video
input terminal of IC3805 (A
V SWITCH)?
(RGB signal input)
Are there RGB signals input at pins (63),
(61) and (59) ?
(RGB signal input)
Check between pins (15), (1
1) and (7)
of SC1
101 and pins (63), (61) and (59)
of IC3805 .
External input in trouble <lNPUT
-3>
Is Input 3 selected in the input switching menu screen?
Select Input 3 and the input signal in the input
switching menu screen.
Is there video signal input at each video input terminal of
IC3805(A
V SWITCH)?
(COMPONENT
input)
Are there
Y
, Pb and Pr signals input at pins (15), (17) and (19) ?
(RGB signal input)
Are there RGB signals input at pins (9), (5) and (7)?
(COMPON ENT
input)
Check between pins (2), (7) and (4) of J1
101 and pins
(15), (17) and (19) of IC3801.
(RGB signal input)
Check between pins (15), (1
1) and (7) of SC1
103 and
pins (9), (5) and (7) of IC3805 .
Are there MAIN VIDEO signals output at pins (50), (48) and (46) (Y
, Pb and Pr signals) , P
ASS VIDEO signals output at pins (38)
, (36) and (34) (Y
, Pb and Pr signals) and SUB VIDEO signal output at pins
(44), (42) and (40) (Y
, Pb and Pr signals) of IC3805?
<MAIN>
RGB Signals
Are there MAIN VIDEO signals input to pins
(24), (29) and (32) (Y
, Cb and Cr) of IC502
(2D-YC & CHROMA) form pins (50), (48)
and (46) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 and IC502.
Are there digital video signal outputs at pins
(1
15)-(126) and (133)-(144) of IC502?
Check IC502 and the peripheral circuits.
<SUB>
RGB / COMPONENT
Signals
Are there VIDEO signals input to pins (8), (10)
and (13) (Y
, Pb and Pr) of IC600 (L.P
.F
.) form pins
(44), (42) and (40) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 and IC600.
Are there SUB VIDEO signal input to pins (2),
(1) and (3) (Y
, Cb and Cr) of IC601 (2D-YC &
CHROMA)?
Check between IC600 and IC601.
Are there digital video signal output at pins (31)
-(40) and (41) - (50) of IC601 ?
Check IC601 and the peripheral circuits.
<MAIN>
COMPONENT
Signals
Are there VIDEO signals input to pins (9), (12) and
(14) (Y
, Pb and Pr) of IC401 (L.P
.F
.) form pins (38),
(36) and (34) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 and IC401 .
Are there MAIN VIDEO signal input to pins (8),
(18) and (20) (Y
, Cb and Cr) of IC402 (3D-YC &
CHROMA)?
Check between IC401 and IC402.
Are there digital video signal output at pins
(124) - (133) and (140) - (159) of IC402?
Check IC402 and the peripheral circuits.
Check IC3805 (A
V SWITCH) and the
peripheral circuits.
Are there digital video signal inputs at pins (53), (54), (57)-(60), (51), (52) (RE0-7), pins(63)-(68), (61), (62) (GE0-7), pin
s (73)-(78), (69), (70) (BE0-7), pins
(81)-(86), (79), (80) (RO0-7), pins (91)-(96), (89), (90) (GO0-7), pins (99), (100), (1), (2), (5), (6), (97), (98) (BO0-7), an
d pins (7)-(10) (HSYNC, VSYNC, DE,
CLKIN) of IC3201 (L
VDS
TRANSMITTER)?
Replace the main PWB, or check between
IC402/IC502/IC601 and IC3201.
Are there digital video signal outputs at pins (49)(T
A1-), (48)(T
A1+), (47)(TB1-), (46)(TB1+), (44)(TC1-), (43)(TC1+),(41)(TCLK
-), (42)(TCLK+), (40)(TD1-),
(39)(TD1+), (37)(T
A2-), (36)(T
A2+), (35)(TB2-), (34)(TB2+), (32)(TC2-), (31)(TC2+), (30)(TCLK2-),(29)(TCLK2+), (28)(TD2-) and (
27)(TD2+) of IC3201?
Check IC3201 (L
VDS_TRANSMlTTER) and
the peripheral circuits.
Check the LCD CONTROL
PWB.
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