Read Sharp 37VT-26H Service Manual online
37VT-26H(GY)
60
FLOWCHART NO. 2-4
TV TROUBLESHOOTING TABLE
NO RASTER
F1701 Check
Blown out
FLOWCHART NO. 2-5
NO PICTURE, NO SOUND
Normal
Replace the Fuse
T701 Pin (7)
voltage check
about: 350V DC
The Fuse is again
blown out
Normal
IC701 Check
+B voltage check
about: 115V
Normal
Normal
CRT connector
K3~K5 bias check
Abnormal
Normal
Normal
Abnormal
R701
Abnormal
IC701, IC751,
D710, D752
Normal
R610, R614,
Q601, Q602
IC801, Q801,
Q802, Q803
R852, C857
Check
IC851.
about: 0V
D752
C1801, R603 and
D601
D701~D704, C704
Noise increases but
no signal is received.
Is there a signal at
pin (8) of IC401?
Picture noise
decrease but sound
level varies greatly.
Is there a signal at
pin (8) of IC301.
Is there a signal at
pin (1) of IC401?
Check IC401 and adjacent parts
NO
NO
Is there a signal at
pin (47) of IC801?
Check IC801 and
adjacent parts.
Check Q851, Q852
and adjacent parts.
Check TUNER
Circuit and bias.
Check Tuner AGC.
Is there a signal at
pin (8) of IC851?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Check TU201.
YES
YES
Check the
signal line
between
pin (3) of
IC351 and
pin (8) of
IC301.
Is there a
signal at
pin (3) of
IC351.
Is there a
signal at
pin (1) of
IC301?
NO
NO
Check or
replace
IC351
and/or
adjacent
parts.
Is there a
signal at
pin (8) of
IC351?
YES
Is there a
signal at
pin (12) of
IC851?
Check
the
speaker.
Check
IC301
and
adjacent
parts.
Does the noise level increase at max,
Contrast, Brightness, and Sound Control?
Is there a signal at
pin (16) of TU201.
Check TU201,
IC2001 and
adjacent parts.
Check Q201
and adjacent
parts.
Check IC2001
and adjacent
parts.
Abnormal
Circuit to be checked:
1. TUNER
2. PIF
3. Automatic gain
control
4. 9V power source
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