Read Sharp LC-37GA3E (serv.man8) Service Manual online
41
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
No video output (3)
No
TV video outpuut.
Is
TV selected in the input switching menu
screen?
Select
TV in the input switching menu
screen. Check that "Audio Only" is "Of
f".
Is there
TV video signal output at pin (17) of
T
uner?
Check tuner and and the peripheral circuits.
Is there
TV video signal output at pin (5) (TP1
183)
of IC1
106 (LEVEL
ADJ.)?
Is there LEVEL
CTL
signal input to pin (6) of
IC1
106 from IC1
108?
Is there
TV video signal input at pin (63) of
IC3801 (A
V SWITCH)?
Are there VIDEO signals input at pin (8) of IC401 (MAIN L.P
.F
.) and pin (2) of IC600 (SUB L.P
.F
.)?
Check IC3801 (A
V SWITCH) and the
peripheral circuits.
Are there MAIN VIDEO signal output at pin (56) and SUB VIDEO signal output at pin (44) of IC3801 ?
Check between IC3801 and IC401/lC600.
<MAIN>
3D-Y/C (P
AL)
Is there video signal input at pin (8) of IC402
(MAIN 3D-YC & CHROMA) ?
Check between IC401 and IC402.
Are there digital video signal outputs at pins
(124)-(133) and (140)-(159) of IC402?
Check IC402 and the peripheral circuits.
<MAIN>
2D-Y/C (SECAM)
Is there video signal input at pin (12) of IC502
(MAIN 2D-YC & CHROMA) ?
Check between IC401 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>
Is there video signal input at pin (72) of IC601
(SUB 2D-YC & CHROMA) ?
Check between IC401 and IC601.
Are there digital video signal outputs at pins (31)-
(40) and (41)-(50) of IC601 ?
Check IC601 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), and 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 )(TCL
K-), (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+) o
f IC3201?
Check IC3201 (L
VDS
TRANSMITTER) and the
peripheral circuits.
Check the LCD CONTROL
PWB.
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