Sharp LC-26P50E (serv.man9) Service Manual ▷ View online
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
46
TROUBLE SHOOTING TABLE
(Continued)
NO
NO
NO
NO
The backlight turns on, but no picture appears on the LCD.
A data bit is missing. (Gradation-related)
Is the power supplied to MAIN-PWB?
(P1800: +14V/UR4.5V/UR+3.5/BU+3.3V)
YES
YES
YES
Adjustment process menu: When the PATTERN 1 is set to 2, is
the gradation pattern displayed correctly?
NO
Check the connection of SC4651 and SC4652 of LCD-PANEL-
FPC, IC4502 (LCD-CTL) and its peripheral circuits.
YES
When the QC drive is turned on or off in Menu-Option-Quick
Shoot, is missing of data bit resolved?
NO
Check IC4601 (LVDS) and its peripheral circuits.
YES
Go to ÒWhen the QC drive is turned on, noise appears in the
moving pictureÓ.
Is the output signal of IC4601
(LVDS) sent correctly?
Adjustment process menu: When the PATTERN
1 is set to 2, is the gradation pattern displayed
correctly?
Check IC4502 (LCD-CTL).
YES
Is the input signal of IC4601
(LVDS) sent correctly?
Check IC330
(V-PROCESSOR).
YES
Is pin 25 "LVDS-PD" of IC4601
(LVDS) "H"?
Check IC4601 (LVDS) and its
peripheral circuits.
Check IC2007 (CPLD).
NO
NO
NO
YES
Is the VLS voltage (VLS15V) of
the IC4104 (DC/AC-CONV)
output normal?
Check IC4104 (DC/AC-CONV)
and its peripheral circuits.
YES
Is the VGL voltage (-6V) of the
IC4104 (DC/AC-CONV) output
normal?
Check IC4104 (DC/AC-CONV)
and its peripheral circuits.
YES
Is the VGH voltage (34V) of the
IC4104 (DC/AC-CONV) output
normal?
Check IC4502 (LCD-CTL).
Check IC4104 (DC/AC-CONV)
and its peripheral circuits.
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
47
NO
YES
When the QC drive is turned on, noise appears in the moving picture.
The display is entirely whitish. (LCD power)
YES
! "#
YES
NO
NO
$
"
%! $&'( )*+,# $&-(
)$+.$)#/
NO
$01 2 ,
YES
3 4 $&(& +$5+$.$0*#
*), *67 *6)#
YES
$
" )$+. ).$0$0 ,$&'- &'-#
8$
/
$
" $&(&
*), *67 *6)#/
$01 2 ,/
$
" $&-( )$+.$)#
/
YES
NO
NO
$&-( 01#
1 $&-( 01#
/
4
4 $&-(9 '&1.,+ 1#
:/ 9/9*
$
" $&-( )$+.$)# $&-(9 '&1.,+ 1#
/
!34
4
5 6 4 $&-(
01#
$
" $&-( 01# $&-( )$+.$)#
/
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
47
NO
YES
When the QC drive is turned on, noise appears in the moving picture.
The display is entirely whitish. (LCD power)
YES
! "#
YES
NO
NO
$
"
%! $&'( )*+,# $&-(
)$+.$)#/
NO
$01 2 ,
YES
3 4 $&(& +$5+$.$0*#
*), *67 *6)#
YES
$
" )$+. ).$0$0 ,$&'- &'-#
8$
/
$
" $&(&
*), *67 *6)#/
$01 2 ,/
$
" $&-( )$+.$)#
/
YES
NO
NO
$&-( 01#
1 $&-( 01#
/
4
4 $&-(9 '&1.,+ 1#
:/ 9/9*
$
" $&-( )$+.$)# $&-(9 '&1.,+ 1#
/
!34
4
5 6 4 $&-(
01#
$
" $&-( 01# $&-( )$+.$)#
/
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
47
NO
YES
When the QC drive is turned on, noise appears in the moving picture.
The display is entirely whitish. (LCD power)
YES
! "#
YES
NO
NO
$
"
%! $&'( )*+,# $&-(
)$+.$)#/
NO
$01 2 ,
YES
3 4 $&(& +$5+$.$0*#
*), *67 *6)#
YES
$
" )$+. ).$0$0 ,$&'- &'-#
8$
/
$
" $&(&
*), *67 *6)#/
$01 2 ,/
$
" $&-( )$+.$)#
/
YES
NO
NO
$&-( 01#
1 $&-( 01#
/
4
4 $&-(9 '&1.,+ 1#
:/ 9/9*
$
" $&-( )$+.$)# $&-(9 '&1.,+ 1#
/
!34
4
5 6 4 $&-(
01#
$
" $&-( 01# $&-( )$+.$)#
/
