Sharp LC-26SH12U Service Manual - Page 23

Check IC401, T401, D437 - no signal

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Page 23 highlights

TROUBLESHOOTING GUIDE THE PICTURE DOES NOT APPEAR (1) No Does backlight shine? Yes No Is CD7201 connected? Yes Is there voltage at pin No 28,29,30 and 31 of CP2407 5V? Yes Is there signal at pins 7, Yes 8, 10, 11, 13, 14, 16, 17, 19 and 20 of CD7201? No No Is there signal at IC2405? Yes Check DIGITAL PCB. Is there voltage at pins 1, No 2, 3, 4 and 5 of CP406 Yes Connected CD7201. Check Q3410 and peripheral circuit. Check IC401, T401, D437 and peripheral circuit. Change V2301(PANEL). Change IC2405. E-3

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TROUBLESHOOTING GUIDE
THE PICTURE DOES NOT
APPEAR (1)
Is there signal at pins 7,
8, 10, 11, 13, 14, 16, 17,
19 and 20 of CD7201?
Is there signal at IC2405?
Change V2301(PANEL).
Change IC2405.
Check DIGITAL PCB.
Does backlight shine?
Is CD7201 connected?
Connected CD7201.
Is there voltage at pins 1,
2, 3, 4 and 5 of CP406
Check IC401, T401, D437
and peripheral circuit.
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Check
Q3410 and
peripheral circuit.
Is there voltage at pin
28,29,30 and 31 of
CP2407 5V?
E-3