Read Sharp 37VT-26H Service Manual online
59
37VT-26H(GY)
NO
YES
YES
YES
YES
NO
FLOWCHART NO. 2-2
KEY-IN TROUBLESHOOTING
Key-in input is not received.
FLOWCHART NO. 2-1
TV TROOUBLESHOOTING TABLE
Set not operating
Is the key switch in good contact ?
Check the switch contact.
Is there short-circuit in the key input ?
Check key lines to input of IC2001.
NO
YES
NO
Are signals received at pins (8) and (9)
of IC2001 when the key is activated ?
Check IC2001 and switches for poor
soldering.
Check IC2001.
NO
YES
YES
NO
FLOWCHART NO. 2-3
INFRARED R/C TROUBLESHOOTING
No operation is possible from the
infrared remote control.
Check R2069 and GND lines.
NO
NO
NO
YES
Is "L" pulse given out of pin (1) of the
receiver and received at pin (14) of
IC2001, when the infrared remote
control is activated ?
Does the infrared remote control
function ?
Is 5V applied at pin (2) of the remote
control receiver ?
Replace the infrared remote control
as required.
Check pin (14) of IC1001. and/or
receiver and R2008.
Is fluorescent lighting enough away
from the set ?
YES
Reposition the set not to be exposed
to strong light.
YES
Is there short-circuit in the key input
or IC2001 ?
Check key input terminals.
Check IC2001.
Is AC cord connected ?
Is 350V DC applied to
C704 ?
Connect AC cord.
NO
NO
AC cord broken.
Is F1701 blown ?
YES
Is 15V DC applied to
pin (4) of IC701 ?
Check R702, R703,
SCR701 and IC701.
NO
Is AC applied to line
between (1) and (2) of
A-connector ?
YES
NO
Does pulse waveform
exist at line between
(1) and (2) of IC701 ?
Is 350V DC applied to
line between (1) and
(2) of IC701 ?
YES
Check secondary
circuits of D751~D755
and FB751~FB756.
NO
Pins (7), (5)
of T701
open.
YES
Check IC701
and adjacent
parts.
NO
Check
D701~D704,
L1701, L1702
and R701.
YES
Check
AB-connector
s and AB-wire
harness.
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