Samsung Le40a456c2d previous image stuck on screen

[sordids999]

hi guys

just need to confirm if this Tcon board is faulty

T400XW01 V5 40T01-C00

VGamma 1 6.86V
VGamma 6 7.28V
VGamma 9 7.37V
VGamma 10 7.55V
VGamma 11 7.57V
VGamma 12 6.63V
VGamma 14 4.89V
VGamma 17 4.16V
VGamma 22 0.33V

Thanks

[Davi.p]

Re: Samsung Le40a456c2d previous image stuck on screen

Why some gamma are missing?

[CapLeaker]

Re: Samsung Le40a456c2d previous image stuck on screen

and a picture of the screen. I wonder if the problem is on the whole screen, or just an affected area. Usually a faulty Gamma IC just friggs around with the color, solarization etc.

[sordids999]

Re: Samsung Le40a456c2d previous image stuck on screen

These are the only gamma voltages on the board I can find
Image uploaded

[sordids999]

Re: Samsung Le40a456c2d previous image stuck on screen

I was told the tv was losing colour and sometimes an image is stuck when the picture changes just like plasma burn in but at the moment I can't get the tv to show any faults

Thanks

[CapLeaker]

Re: Samsung Le40a456c2d previous image stuck on screen

check all the pins around the AS15-F. Clean the ribbon cables going to and coming from the TCon.

[attainteddragon]

Re: Samsung Le40a456c2d previous image stuck on screen

also attach one ribbon from the t-con at a time and see if it has lag on 1 half only.

more gamma readings would of been handy. who designs these boards, :P
but your vgamma 1 is out of sequence, so you may still have an as chip issue.

[snowfun]

Re: Samsung Le40a456c2d previous image stuck on screen

Have you changed already? AS-15 ? if not change it,many problems with gama with as15.

[noledud]

Re: Samsung Le40a456c2d previous image stuck on screen

picture of the fault would be better but no fault no fix

the few voltages you have given dont look right noting the number 1 value

there are repair services for the AS15 gamma chip on ebay if you dont fancy doing it your self

[Davi.p]

Re: Samsung Le40a456c2d previous image stuck on screen

"check all the pins around the AS15-F" it's risky to measure directly on the chip..
the missing gamma testpoints can be on the bottom side..

[saddle_au]

Re: Samsung Le40a456c2d previous image stuck on screen

Check the negative voltage generator on the TCON.

[Andrew F. Ali]

Re: Samsung Le40a456c2d previous image stuck on screen

If you cannot/don't have tools and skill to change the AS15 Chip on the T-CON Bd. You could probably get one on-line for a reasonable price. Replace the T-CON Bd.

[sordids999]

Re: Samsung Le40a456c2d previous image stuck on screen

update ## As15 chip replaced
Tv all working again luckily spotted some solarization and brightness issues so changed the chip
Thanks