T-Con Repair ?

[Mikeyboy2007]

turning back for a little info i had a samsung LE37R88BD a few years ago and it developed a dark picture and ghosting fault, changed the T-Con out and the thing worked like new again and hasnt went faulty since. I have purchased another Samsung but this time model number is LE37R87BDhs thhe same fault. it is the exact same T-Con board that is in the TV so my question is will i have to purchase a new T-Con or can an existing one be repaired ?

[budm]

Re: T-Con Repair ?

Can we see the pictures of the board and the screen shot to see what the pictures you describe look like?

[Mikeyboy2007]

Re: T-Con Repair ?

picture of T-Con, you want a picture of the Ghosting Budm ?

[Mikeyboy2007]

Re: T-Con Repair ?

sorry Budm thats the wrong picture, this is the right one.

[budm]

Re: T-Con Repair ?

Can we see the screen shot of the picture so I can what the fault looks like?

[Mikeyboy2007]

Re: T-Con Repair ?

sorry Budm here is a pic, plugged up my Roku stick and went into Spotify then came back out it and left image on screen when i came back out it.

[audiofreak19]

Re: T-Con Repair ?

Looks like it has a as15 chip in it. The one in the top right hand corner.

[tom66]

Re: T-Con Repair ?

Yep looks like an AS15 failure to me, to prove it you can test the gamma voltages on the T-con.
(I thought we had a quiet week for AS15's!)

[Mikeyboy2007]

Re: T-Con Repair ?

would replacing that chip be the solution to repairing the T-con audiofreak19 ?

[Mikeyboy2007]

Re: T-Con Repair ?

Yep looks like an AS15 failure to me, to prove it you can test the gamma voltages on the T-con.
(I thought we had a quiet week for AS15's!)

how would i go about doing that Tom66

[tom66]

Re: T-Con Repair ?

On the left hand side of the T-con board you have a large block of test points marked VGAMA1 through VGAMA22.

Please take a measurement of each and post the result of each
e.g.

VGAMA1 - 0.05V
VGAMA2 - 0.5V

etc.

(The results will vary)

[Mikeyboy2007]

Re: T-Con Repair ?

Tom have i got multimeter set up properly as voltages are coming back minus volts ?

[tom66]

Re: T-Con Repair ?

You have the red probe in COM and black in VOLT/OHM, it doesn't really matter but you should normally have the black probe in COM and red in VOLT/OHM.
(Just ignore the minus sign for the readings if you have made some already, it's not important.)

[Mikeyboy2007]

Re: T-Con Repair ?

OK tom here goes

VGAMA1 : -15.47v
VGAMA2 : -15.34v
VGAMA3 : -13.56v
VGAMA4 : -12.36v
VGAMA5 : -11.50v
VGAMA6 : -10.89v
VGAMA7 : -10.53v
VGAMA8 : -10.24v
VGAMA9 : -9.97v
VGAMA10: -7.57v
VGAMA11: -7.39v
VGAMA12: -6.89v
VGAMA13: -6.93v
VGAMA14: -7.40v
VGAMA15: -7.46v
VGAMA16: -7.54v
VGAMA17: -7.63v
VGAMA18: -7.75v
VGAMA19: -7.87v
VGAMA20: -8.04v
VGAMA21: -8.54v
VGAMA22: -8.60v

[tom66]

Re: T-Con Repair ?

That was with black probe on the chassis, and with volt/ohm and COM the wrong way around?
If so the AS15 chip is bad... very common fault

[Mikeyboy2007]

Re: T-Con Repair ?

yeah that was with probes wrong way around Tom. so replace the AS15 chip ? last time i replaced the exact same chip is because all the colours where inverted and very high contrast on the same TV

[audiofreak19]

Re: T-Con Repair ?

Yahtzee! Yea if those test points are correctly read on your DMM then it's bad. I just ordered one from Ernesto's electronics.com. Came out to 5.50 shipped in the U.S

[Mikeyboy2007]

Re: T-Con Repair ?

was looking at this one :http://www.ebay.co.uk/itm/AS15-F-AS1...item1e8ba3379f

it is AS15-F, do those other numbers need to match ?

[audiofreak19]

Re: T-Con Repair ?

I don't believe they matter as long as you get the correct letter F or G or whatever.

[Mikeyboy2007]

Re: T-Con Repair ?

Thanks have ordered 2 as i have another this one to repair and have a faulty one with same issue from the same model tv i had a year or so ago.