Samsung LE40B530P7 White out

[suffolkchat]

Hi all

Help needed, LCD fires up just about and see the picture but with a white out
all colours near max strange
All caps look fine

i've looked at few posts, and possible can rule out the psu? below causing it

I have tried info menu mute power reset with no change



And more so looking at this maybe the problem ?



its well tucked away so not had a good look

any advise
many thanks
john

[tom66]

Re: Samsung LE40B530P7 White out

Is there an AS15 IC on the T-con? (Small square chip.)

[suffolkchat]

Re: Samsung LE40B530P7 White out

No nothing ic of that id

[tom66]

Re: Samsung LE40B530P7 White out

We need a closer image of the T-con board, ideally we would be able to read the part numbers on each IC, if necessary, split the photo into two or four parts.

[suffolkchat]

Re: Samsung LE40B530P7 White out

ok will take original pic now

[suffolkchat]

Re: Samsung LE40B530P7 White out

Picture of board taken out



thanks

[budm]

Re: Samsung LE40B530P7 White out

Does your screen look like this?
https://www.badcaps.net/forum/showth...264#post328264

Or like this:
https://www.badcaps.net/forum/showth...mma#post304275

[tom66]

Re: Samsung LE40B530P7 White out

You can try testing the voltages in the box marked GAMMA. Each voltage 1 thru 18 should test slightly higher than the last.

[suffolkchat]

Re: Samsung LE40B530P7 White out

no its not
when turned on
i get full bright white screen with a faint shaeded picture with hardly any colour
as if colours were nearly off but brightness is full up

yet colour controls are up high

[suffolkchat]

Re: Samsung LE40B530P7 White out

i just found meter batts dead so i cannot test voltages tonight

[tom66]

Re: Samsung LE40B530P7 White out

It does sound like GAMMA fault, so please perform the test I suggested (board installed in TV.) Gamma circuit is used to drive the panel brightness, making the light output linear with the input signal.

[suffolkchat]

Re: Samsung LE40B530P7 White out

ok i will test
thanks

[suffolkchat]

Re: Samsung LE40B530P7 White out

Just out of interest the back light is fine
powered by psu board yes ?

john

[tom66]

Re: Samsung LE40B530P7 White out

Yes

[suffolkchat]

Re: Samsung LE40B530P7 White out

Hi i did try doing the gamma test but my hands were not stable enough

i since bough s/h tcon and although diferent patern of colours its basically the same problem still
i will post oic of picture white with hint of colour and program

[leonard]

Re: Samsung LE40B530P7 White out

more than likely the t-con board or the lcd panel itself

here is a link on how to test the psu
https://www.youtube.com/watch?v=wrD1d-a2fnA