Samsung LE37A456C2D - image retention issue

[tom66]

Re: Samsung LE37A456C2D - image retention issue

Panel or t-con, main would not cause this, panel more likely.

[noledud]

Re: Samsung LE37A456C2D - image retention issue

ok thanks tom - i will try a tcon as i cant try a panel lol

[wreksta]

Re: Samsung LE37A456C2D - image retention issue

a lil bit info from expeirence could be the side ribbons if it has them down the left and right of the panel they are little one inch ribbon tabs with little component on

you will have to remove the panel from the tv then the metal frame supports from the front of the panel
i find if i only remove the top and the sides screws the frame will tilt toward you enough to gain access this way also secures the lcd in the frame

drastic you may say but if it has them try pressuring it or slowly peel from panel watch picture if it improves remove whole tab

this has worked for me with a few samsung A models

[tom66]

Re: Samsung LE37A456C2D - image retention issue

What??? Do NOT pull the tabs off!!! This kills the panel.

[wreksta]

Re: Samsung LE37A456C2D - image retention issue

tom i did say was drastic but i have had sucess in past by removing the very top far right tab and tv still lives and beautifull picture mate

[tom66]

Re: Samsung LE37A456C2D - image retention issue

Well, I would be extremely surprised if that didn't leave you with a dead panel. I suspect as this is a 720p AUO panel it uses only left or only right hand gate drivers anyway.

[noledud]

Re: Samsung LE37A456C2D - image retention issue

ok got the new tcon - bought as "tested"

so i have good news and bad news

good is the image retention does not happen anymore

now the problem is colour washed out like an xray sort of thing

iv read this is the gamma chip is that correct also how difficult is it to replace?

[tom66]

Re: Samsung LE37A456C2D - image retention issue

Can you see any points marked VGAMA1 thru VGAMA22 or so? Test the voltage on each.

[noledud]

Re: Samsung LE37A456C2D - image retention issue

this is bad IR tcon so i take it that refers to the IC in the top left of the pic ?

[tom66]

Re: Samsung LE37A456C2D - image retention issue

The group of test points marked VGAMA1, etc. You will have to find some of the missing ones (need to get all from VGAMA1 thru VGAMA22 or whatever it goes up to.)

[noledud]

Re: Samsung LE37A456C2D - image retention issue

there are 16 points there and only 14 on the lable

[tom66]

Re: Samsung LE37A456C2D - image retention issue

There's a box around the gamma points. The other two are independent points for other signals.

You also need to find VGAMA3,4,5,9,18,19,20 which are going to be scattered elsewhere around the board.

[noledud]

Re: Samsung LE37A456C2D - image retention issue

update on this - gamma tested bad - got a new chip installed and tv works fine now

[comptek]

Re: Samsung LE37A456C2D - image retention issue

Hi All i have the same issue on the same tv
but the picture makes everyone look like Dale Winton or Des O'connor
Dark picture all over and has image retention swapped t-con and still the same

any ideas please
Regards
Gary

[Alastair E]

Re: Samsung LE37A456C2D - image retention issue

Hi All i have the same issue on the same tv
but the picture makes everyone look like Dale Winton or Des O'connor
Dark picture all over and has image retention swapped t-con and still the same

any ideas please
Regards
Gary

Check Gamma Voltages as described above. Chances are you bought a duff T-Con.

[comptek]

Re: Samsung LE37A456C2D - image retention issue

will try thank you Alastair