Sharp LC-26SB14U Service Manual - Page 20

The Picture Does - 26

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TROUBLESHOOTING GUIDE THE PICTURE DOES NOT APPEAR No Does backlight shine? Yes No Is CD2804 connected? Yes Is there voltage at pins No 1, 2, 3, 4 and 5 of CP2804 5V? Yes Is there signal at pins 13, Yes 14, 16, 17, 19, 20, 22, 23, 25 and 26 of CP2804? No Change DIGITAL PCB. Is there voltage at pins 1, No 2, 3, 4 and 5 of CP406 24V? Yes Connected CD2804. Check IC407 and peripheral circuit. Check IC401, T401, D437 and peripheral circuit. Change V2301 (PANEL). E-3

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TROUBLESHOOTING GUIDE
THE PICTURE DOES NOT
APPEAR
Is there signal at pins 13,
14, 16, 17, 19, 20, 22,
23, 25 and 26 of
CP2804?
Change V2301 (PANEL).
Change DIGITAL PCB.
Does backlight shine?
Is CD2804 connected?
Connected CD2804.
Is there voltage at pins 1,
2, 3, 4 and 5 of CP406
24V?
Check IC401, T401, D437
and peripheral circuit.
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
Check IC407 and
peripheral circuit.
Is there voltage at pins
1, 2, 3, 4 and 5 of
CP2804 5V?
E-3