problem with changing board in samsung syncmaster S20v310b plus

[Amir]

hi to all
in samsung S20v310b plus after changing mainboard(damaged) i have a problem.blanking backlight.i have no signal logo without problem.
model code:ls20v300bschd (back cover label)
main board old: sa300/sa350 bn41-01592d rev no:mp 1.0 (20 inch)
new main board:sa300/sa350 bn41-01592b rev no:mp 1.0 ( 19 inch)
panel spec:LTM200KT08
i tested with several flash dump but just blinking backlight problem .
with some file no blinking but character is out of size.
please help me.
tn

[matic]

Hello!

Try to transplant old FLASH chip to the new board (if the old FLASH chip is not broken).

[Amir]

tnx matic
one of my friend had problem like this.
he changed 19 inch backlight with 20 inch backlight and problem solved.
may chang backlight wiring to solve problem?

[matic]

If so, the issue could be with LED backlight driver circuit, which can not handle with less LED strips in backlight. The 20 inch display is larger than 19 inch, so there are more LED-s inside.

Post clear pictures (with visible component markings) of the following part of the old and new board.

[Amir]

hi
all the part is the same . i checked Carefully.
I have to say with 22 inch firmware no blinking and backlight worked fine but the all font size is out of range.
it is wiring problem or firmware problem?

[matic]

If all of the components in the backlight driver circuit have the same value like on the old board (specially a current sensing resistors R828, R829, R831, R832, R833 and inductors L801 and L802) the issue is probably a firmware, which is not compatible with that type of LCD panel.

As I said before:

Try to transplant old FLASH chip to the new board (if the old FLASH chip is not broken).

[Amir]

tnx matic
i missed old firmware .