Samsung lcd tv #ln32a330j1d display issue

[starmaxpc]

Hello guys. I have a samsung lcd tv with display issue. tv is working fine except the display is washed out / fuzzy / ghosty looking. i've posted some pic's hopefully an easy fix as its in great shape / condition other than issue stated. please let me know if there is any other info you would need. Thanks to all who reply

[capkid]

Re: Samsung lcd tv #ln32a330j1d display issue

This looks like a t-con issue to me.

[budm]

Re: Samsung lcd tv #ln32a330j1d display issue

Post the picture of the T-CON board. it looks like AS15G Gamma IC problem on the T-CON board.

[munirutech]

Re: Samsung lcd tv #ln32a330j1d display issue

check the t con board if you find this ic

as15g or as15u or as15f if you find one of this then change it

[starmaxpc]

Re: Samsung lcd tv #ln32a330j1d display issue

Post the picture of the T-CON board. it looks like AS15G Gamma IC problem on the T-CON board.

yes it is the AS15G ic chip. my pic is a little blurry but that is the correct # on ic chip. i think removing that is out of my soldering experience. any info on possibly purchasing a new / used t con for this model? thanks!!

[tom66]

Re: Samsung lcd tv #ln32a330j1d display issue

Before we declare T-con as bad, need to check gamma voltages and VCOM.

VCOM: is marked as VCM. Expect around 7 to 8V.

Gamma voltages: GM1 - GM14. These voltages will start from 0V or 15V and go to 15V or 0V, monotonically (only increase or decrease; not both.) See attached graph. If there is a fault they will not look right and the image will look bad. Typically too white or too dark.

Test: red probe on point, black probe on chassis, multimeter set to volt DC (20V scale or autorange, whichever available.) Note: must use digital multimeter.

[budm]

Re: Samsung lcd tv #ln32a330j1d display issue

This is the same T-CON as used in the LN32A300.
http://s807.photobucket.com/user/bud...tml?sort=3&o=2

It has bad AS15 as well.

[DjKrish]

Re: Samsung lcd tv #ln32a330j1d display issue

Is it only me or that i noticed the 751F9 regulator has a burned out mark on the tcon?

[budm]

Re: Samsung lcd tv #ln32a330j1d display issue

It looks like a dimple on the body, it is 3.3V Fixed regulator, he can check the Voltage on that test point V33V.

[jokaankit]

Re: Samsung lcd tv #ln32a330j1d display issue

I'm experiencing i similar issue. When the power is cycled by pulling the plug it appears perfect, then washes out to greyish white. I tried insulating (with index cards and tape) the frame from the chips on the bottom of the screen that connects the t-con and panel. I also reseated all cables, it looks like I may have the same problem. Did you experience the delayed greeting on power cycle? It is immediate for me after using the remote to power cycle. Have you solved the problem with a new T-con. Thanks

P.S. I have the LN32A300J1DXZA, which I believe to be near identical.

[DLinkOZ]

Re: Samsung lcd tv #ln32a330j1d display issue

Check the gamma voltages on the tcon, I've had several of these as15 ICs fail. Super-easy way to identify the problem. It should have a fairly steady ramp in voltage, but when they fail you'll get noticeable spikes and dips. If that's the case, then you can replace the IC yourself if you have the tools and experience. Otherwise, a repair service is good (I've used Coppell TV, doesn't hurt that they're local) for $40-50. Personally, I would be nervous about a replacement board since you don't know the age/history and may be looking at another gamma IC failure before long.

[jokaankit]

Re: Samsung lcd tv #ln32a330j1d display issue

Thank you for the help. The insulating did however extend the delay of normal picture to gradual fading to a bright grey by 2-3 seconds which has me hoping it's a grounding issue and not a ic failure. I will get back to you with voltages when home. Do I follow your instructions intended towards OP, with red marking? Can you also recommend multimeter settings. I'm also a bit uncertain on how to power the tv while accessing the t-con. T.I.A.

[DLinkOZ]

Re: Samsung lcd tv #ln32a330j1d display issue

Yes, follow the instructions provided above in the thread. You're looking at a range of approximately 0 (or close to it) ramping up to approximately 15v. It's nice to get a visual graph from your collected readings, it will help you see if the line is relatively smooth or has big dips and/or peaks. However, a lot of times I've found the highs/lows to be so pronounced that they're obvious from just looking at it.

For powering the TV, I've always left everything in place and simply removed the cover from the t-con board and hang my negative somewhere along the metal frame (I usually slightly insert it into a threaded hole to give it something to grip and hang from). So nothing special to note other than gaining physical access.

[Deal]

Re: Samsung lcd tv #ln32a330j1d display issue

I have the same Tcon board in my Samsung and am having the same problem. The TV turns on and looks fine, within 2-3 seconds the picture fades until it looks just like OP's in about 10 seconds.

I tested the gamma voltages and they seem ok (0, 3, 3.8, 4.5, 6, 6.2, 6.7, 7, 7.7, 8.6, 10.9, 13

The VCM is only showing 0.13V, well short of 7!

It does have the AS15G IC, should I go ahead and swap that out or am I looking at a different issue?

[tom66]

Re: Samsung lcd tv #ln32a330j1d display issue

Are those the only voltages available?

[Deal]

Re: Samsung lcd tv #ln32a330j1d display issue

Sorry for my carelessness. These are the 15 gamma voltages.

0, 3, 3.8, 4.5, 5, 6, 6.2, 6.7, 7, 7.7, 8.6, 9, 9.7, 10.9, 13

I was curious about the VCM, so I powered down the unit and watched the VCM voltage during startup. It started at 6v and steadily dropped, after 15 seconds it was down below 1v. Is that suspicious?

Thanks very much for your assistance.

[tom66]

Re: Samsung lcd tv #ln32a330j1d display issue

Yes, the VCM is suspect, and the other voltages look a little off to me, but I am not certain. I think AS15-F is the fault.

[Deal]

Re: Samsung lcd tv #ln32a330j1d display issue

Thank you Tom. I will now try and source the part. I'm not sure how easy that will be in Canada. If it is within the forum rules for someone to suggest places near Toronto to try i would appreciate the guidance.

[tom66]

Re: Samsung lcd tv #ln32a330j1d display issue

The AS15-F part which requires good soldering ability to replace is widely available from China & the USA. The T-con board may be harder to source.

[Deal]

Re: Samsung lcd tv #ln32a330j1d display issue

I could not find the Tcon board so I ordered the IC. I have a month to practice my soldering skills prior to it arriving.