Sharp 37GT-27H (serv.man13) Service Manual ▷ View online
32
37GT-27H
NO PICTURE
NO
Check Q1001,
IC1001, IC1003
Check the tuner supply
and band biases. Both
must be approx. 5V DC
Normal
YES
Is tuning voltage
normal at
Pin (2) of Tuner?
Check Picture
setting by R/C. Signal
should be received.
-Check the AGC Voltage:
Pin (1) of Tuner.
-Check the SAW Filter: SF201
Pin (1) of Tuner.
-Check the SAW Filter: SF201
TROUBLESHOOTING TABLES.
33
37GT-27H
NO SOUND
Check Sound setting by
R/C. Signal should be
received.
NO
YES
Check D707, C710
NO
Is
Audio Amplifier
muted?
Check R304, Q301, Q302
NO
Check IC801, C301
YES
YES
Check IC1001, Q305
Does
Sound Signal
appear at Pin(6)
of IC801?
Does
approx. 20V DC
appear on
C710?
34
37GT-27H
NO RASTER
Check F701
Normal
Fuse Blown
Normal
Replace Fuse
Fuse Blown
again
Check IC701
Normal
Abnormal
Check Q601,
C711
Check D708, D717
Normal
Check R705, R706,
R715, D706
R715, D706
Normal
Check CRT connector
K1... K5 bias
Normal
Abnormal
Check C878
Check IC801
Check Q601, C711
Check Voltage on C705
(Approx. 325V DC)
Check D701, D702, D703,
D704, C705.
Check Voltage on C711
(Approx. 105V DC)
Approx. 0V
35
37GT-27H
NO VERTICAL SCAN
YES
NO
Check D709, D710, IC501
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Readjust Vertical Size.
Check D505, D506
Check Q505, Q507, Q509
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
Check IC801, C815, C816, R818
Vertical size is abnormal
Vertical linearity is abnormal
Is IC501
bias normal?
Check R510, Q501,
Q502, Q503
Display