Read Sharp LC-80LE857E (serv.man4) Service Manual online
LC-80LE857E/K/RU,LE858E
6 – 14
No light (Back Light doesn't light)
Is the AC cord connector tightly connected to the set?
NO
Reconnect the AC cord tightly and turn on the power again.
YES
Are the wire harnesses and other cables properly connected in
the set?
the set?
NO
Reconnect the wire harnesses and other cables properly in the set.
YES
Does Power starts up (central Icon LED ilights up) ?
NO
Refer to "No power (central Icon LED failure to light up) or no startup
(central Icon LED failure is flashing)"
(central Icon LED failure is flashing)"
YES
Is there the pins [16/PNL_POW] of [PD]P3801 at "H"?
NO
Check the power unit ,
and the signal line between PNL_POW and IC3301
(Digital AV decode & Main CPU) .
and the signal line between PNL_POW and IC3301
(Digital AV decode & Main CPU) .
YES
Is there the pins [24/STB] of [PD]P3801 at "H"?
NO
Check the power unit ,
and the signal line between STB and IC2004(UCOM)/IC3301 .
and the signal line between STB and IC2004(UCOM)/IC3301 .
YES
Replace the power unit.
LCD Panel failure(1)
Does a single or sev-
eral vertical stripes
appear on the LCD
screen?
eral vertical stripes
appear on the LCD
screen?
Does a single or sev-
eral horizontal stripes
appear on the LCD
screen?
eral horizontal stripes
appear on the LCD
screen?
Do luminescent or
black dots appear on
the screen?
black dots appear on
the screen?
Is the on-screen image
rippling or distorted?
rippling or distorted?
Is there any por-
tion which some
screens were
darkish or became
whitish?
tion which some
screens were
darkish or became
whitish?
Does all LED of
one line are not
lighting?
one line are not
lighting?
Replace the LCD panel or the power unit.
LCD Panel failure(2)
The backlight functions.
Does not the image come
out in the LCD screen
(screen black) ?
Does not the image come
out in the LCD screen
(screen black) ?
Does the entire LCD
screen look whitish all
over?
screen look whitish all
over?
Does the QS drive func-
tion?
tion?
Are the data bit drop-out?
(No solution even when
turning on and off the QS
drive)
(No solution even when
turning on and off the QS
drive)
Is the gamma correction as
specified?
specified?
Replace the LCD_CONT_UNIT.
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