Sharp LC-65D90U - Page 48

48
LC-65D90U
TROUBLE SHOOTING TABLE (Continued)
YES
NO
NO
Improper picture
The test pattern properly appears onscreen. Is
the other display white all over?
The test pattern properly appears onscreen. Is
the other display black all over?
Check IC4003, IC4001, IC4004 and their
peripheral circuits.
YES
Is the VSYNC signal properly inputted to pin
(2) of IC4401?
Is there 3.3V at pin (5) of IC2201?
Check P5302, P2204, IC2203 and their
peripheral circuits.
YES
NO
Check SC2301, SC2201 and their peripheral
circuits.
Check IC2301, SC2301, SC2201 and their
peripheral circuits.
NO
NO
YES
NO
NO
NO
NO
NO
YES
YES
NO
NO
Switch to REV DISP on LCD PAGE1 in the
process mode. Does the problematic spot stay
there?
Enter "02" for PATTERN1 on PATTERN PAGE1
in the adjustment process menu. Is the
gradation pattern properly displayed?
Enter "21" for PATTERN3 on PATTERN PAGE1
in the adjustment process menu. Is the
gradation pattern properly displayed?
YES
Check the line between IC4101 and IC4102
and that between IC4201 and IC4202, as well
as their peripheral circuits.
NO
Change from 0 to 255 the PATTERN A on
PATTERN PAGE1 in the adjustment process
menu. Is the entire gradation pattern properly
Check the line between IC4001 and IC4101
and that between IC4004 and IC4201, as well
as their peripheral circuits.
YES
Is there problem with the screen's left half
alone except for the test pattern?
Check the line between IC4004 and SC4002
and that between IC3201 and SC3200, as well
as FPC.
YES
Is there problem with the screen's right half
alone except for the test pattern?
Check the line between IC4001 and SC4001
and that between IC3203 and SC3201, as well
as FPC.
YES
Is there problem with the entire screen except
for the test pattern?
Check IC3300 and its peripheral circuits.
NO
Is there problem with the top half of the
screen?
Is there problem with the bottom half of the
screen?
The screen is partially whitish or darkish.
YES
YES
YES
YES
Is there problem with the left or right half
alone?
Check the line between IC4303 and SC4702
and that between IC4903 and SC4701.
Check the line between IC6403 and SC6802
and that between IC6303 and SC6801.
Check IC4501, IC4503 and their peripheral
circuits.
Check IC6601 and its peripheral circuits.
Is there problem with the left or right half
alone?