Samsung LE26A457 Lcon Board.

[zerocool]

Help, My Samsung TV suddenly decided to die on me.
After reading some of the posts, it would seem that other members have had the same problem of the dreaded flashing red LED and no picture. I checked and found that the backlight was on, so it would appear that the power board was okay as I could not see any bulged capacitors.
I did however find that the small 2 amp fuse on the Lcon board was blown and also a small inductance was also burnt up.
I purchased an identical board of ebay, and fitted this but on powering up, the very same inductance burnt up on the replacement board.
Not wanting to purchase yet another Lcon board and blow this one as well, My questions are: was this just a faulty board in the same manner as the original?
or is it a fault with another board or the screen itself.
I have not heard of the screen blowing the LCON board, but if anyone has any suggestions as where to go next I would be very grateful.

[zerocool]

Re: Samsung LE26A457 Lcon Board.

Sorry all about my earlier posting, it should read the TCON board and not the LCON board. ( Hanging my head in shame)

[notallbad]

Re: Samsung LE26A457 Lcon Board.

Any chance you can get some photos up of both sides of the PS board and the T-Con(LVDS).
Also do you have a multi meter to take some readings?

[budm]

Re: Samsung LE26A457 Lcon Board.

The LCD panel may have shorted out TFT Driver ICs which are mounted on the flexible circuit board between the LCD glass panel and the PCB.
It looks something like this:http://s807.photobucket.com/user/bud...tml?sort=3&o=5

[sordids999]

Re: Samsung LE26A457 Lcon Board.

ok got this tv today its got sound but no picture the backlight comes on but i can just see a image,checked voltages to invertor seem fine so...

any ideas

[sordids999]

Re: Samsung LE26A457 Lcon Board.

i can just about see a image but very faint

[tom66]

Re: Samsung LE26A457 Lcon Board.

Check panel manufacturer.
I reckon tab bonds - I've had a few like this - they're pretty easy to fix. (Done four so far.)

[sordids999]

Re: Samsung LE26A457 Lcon Board.

photo added

[tom66]

Re: Samsung LE26A457 Lcon Board.

Hmm, usually ChiMei V260B1 with this fault. You can try the tabs, but no experience myself with this AUO panel. Could also be GAMMA fault, that is common with AUO. Can you post a pic of T-con?

[sordids999]

Re: Samsung LE26A457 Lcon Board.

done

[budm]

Re: Samsung LE26A457 Lcon Board.

Another one with AS15G Gamma voltage ref. IC in AUOPTO T-CON.

http://www.shopjimmy.com/auo-55-07a9...-con-board.htm

[tom66]

Re: Samsung LE26A457 Lcon Board.

Was going to say check gamma voltages but can't see all of them there. Check what you can from VGAMA1 thru VGAMA12. Odd(?)

[sordids999]

Re: Samsung LE26A457 Lcon Board.

Vgama 1 6.46v
vgama 6 7.15v
vgama 9 7.10v
vgama 10 7.15v
vgama 11 7.10v
vgama 12 7.96v
vgama 14 8.03v
vgama 17 8.67v
vgama 22 10.07v

[tom66]

Re: Samsung LE26A457 Lcon Board.

From a quick look at what's available, it's bad. So replace AS15 or t-con.

[sordids999]

Re: Samsung LE26A457 Lcon Board.

thanks searching right as we speak

[sordids999]

Re: Samsung LE26A457 Lcon Board.

Ok then board arrived and fitted colours seem really bright but the strangest thing is I can see the menu on the screen still, seems to be a slight delay

[sordids999]

Re: Samsung LE26A457 Lcon Board.

There seems to go a delay on the TV writing that shows up on screen sits there for ages

[tom66]

Re: Samsung LE26A457 Lcon Board.

Check those gamma volts again - there is a chance the board you got is bad.

[sordids999]

Re: Samsung LE26A457 Lcon Board.

Vgama 1 14.93v
vgama 6 14.75v
vgama 9 10.33v
vgama 10 8.67v
vgama 11 8.55v
vgama 12 7.97v
vgama 14 8.02v
vgama 17 8.67v
vgama 22 10.09v

[sordids999]

Re: Samsung LE26A457 Lcon Board.

Any luck anyone?