Samsung LN52A530P1FXZA Tab bonding repair

[Allan Woods]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Spent 30 minutes looking through these threads on failing tab bonds and the symptoms but cant find out what the fix is. Can you please confirm that the repair is made by placing a soft pad of 5mm thickness over the tab connection and then re-assembling the frame to apply pressure on the tab?
Cheers,
Allan

[budm]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Yes.

[Allan Woods]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Thank you Budm, not to be a smart arse or anything but I was wondering because some of the pictures showed 5mm material folded over 3 times, and I didn't really understand how all that would fit between the tab and the frame

[budm]

Re: Samsung LN52A530P1FXZA Tab bonding repair

The one folded 3 time are from Deal Extreme which is thinner than the Bergquist one from Digikey, I was using them to see how well it will hold up compared to the one made by Bergquist which is more expensive.

[mwalsh]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Just the end ones were a problem on this Samsung 850 series. 2009 model.

Same deal - 850 in the 46" size; 2009 model; top right hand side. Spooky.

Starts out pretty bad when cold; gets better when it gets some heat off the TV and after a bit of massaging by me, but I can't clear the last bit (about 3 lines of pixels worth).

Even so, I reckon my chances are pretty good with this one once I've got it torn down a bit further. Don't you guys?

[mwalsh]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I didn't mention it earlier, but I went dumpster diving at BB again and found a somewhat neglected looking LN52A750, mostly from the way the Geek Squad guy handled it than anything else. I know they consider these trash, but I do wish they'd quit dragging them around on the ground once they've got them out of their trucks! Of course, it's also missing the stand and remote.

I was hoping for an easy victory from this one, and am pleased to find what is almost certainly a single bad tab bond. Didn't even need to take it apart to "fix" it - just need to give the top right hand edge of the back cover a thwack with the palm of my hand when it starts acting up. Of course, I'll still need to get in there and try to shim it properly, but I'm more than confident. Not "I'm going to sell it for big bucks" confident, you understand, but certainly "I'm sure one of the grand kids could find a use for it" (with the advisory that it may not last forever) confident.

I must say that, as I research (and play) with these, I am truly shocked to find the same engineering failures over and over again. OK, fine, we know the bad caps issue was more about skullduggery than bad engineering, but there really are no excuses for the tab bond failures. Over what years was this most pervasive and was it limited to Samsung manufactured panels only? If so, did Samsung sort it out in recent years, or do we not know yet? If not, what about my LG TV's from 2011/2012...I won't have to put up with this stuff when it comes to those, will I?

[mwalsh]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I was hoping for an easy victory from this one, and am pleased to find what is almost certainly a single bad tab bond.

After having it on for a while, I noticed a second tab bond acting up - the one on the very left side this time - manifesting itself as a single vertical line of turquoise pixels that, again, can be cleared easily by giving the rear cover a thwack.

[mwalsh]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I didn't mention it earlier, but I went dumpster diving at BB again and found a somewhat neglected looking LN52A750...I'll still need to get in there and try to shim it properly, but I'm more than confident.

Well this one is taken care of. I shimmed both end tabs with a piece of this stuff, triple folded to give it the right girth:

http://www.ebay.com/itm/111642792448....M-7840.R6.TR7

I can't say I'm all that crazy about the material - it compresses down a lot, and once it gets a bit of heat on it feels a bit more like putty than foam. It did the job though, and the right side tab appears to be completely fixed. I found that I could still get the left side tab to act up occasionally if I squeezed the metal frame just right. It wasn't consistent though - sometimes I could get it to act up, sometimes I couldn't. The answer of course, now it's all back together with the plastic bezel and rear cover, is to just leave it be.

The 46A850 I've also been working on was a bit of a different story. No matter how I shimmed it, I couldn't get the picture to stay clear - installing the metal frame and snugging it up would always make a line or two appear on the right hand side of the screen. Even if I left the center screw out of the metal frame, the same lines would still appear once I'd properly installed the plastic bezel. I had that thing apart three or four times...until I somehow managed to crack the LCD. Sigh. So, sadly, that's another one I'll have to salvage for parts. It's a shame, since it was cosmetically much nicer than the 52" and had the stand! Insult to injury is it's also the one I actually spent good money on (to replace the bad PSU).

Oh, well. At least I got one good TV out of the three I've rescued and kept so far, and I do have quite a good stash of marketable parts to sell!

[Tazchas]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Thanks to Budm and all who contributed to this thread. I have just used the info to repair a LG 42 with tab bond issues. The set has been running well for the last 8 hours,let's hope she lasts :-)

[vinceroger69]

Re: Samsung LN52A530P1FXZA Tab bonding repair

budm are your sets still working fine since you done them as its been a while now be nice to see how long the tab bond fix can last.

[budm]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Both of them (Sony and the SAMSUNG) are still working great and I will not want to own the new TV's with LED backlights either.

[vinceroger69]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Thats good to know then if i can find a decent large screen set for myself to repair/keep i suppose it also helps if you dont move the repaired tv around much either (ie from room to room off tv stands etc).

[DoItYourselfer]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I just wanted to post my appreciation and thanks to those that have gone on before and have posted their information to help others.

I have fixed other Samsung LCD TVs start issues by replacing a couple capacitors, starting with my own 40" the first time about three or four years ago.

Then I stated keeping an eye out for free ones that I could fix. I finally picked up a 32" for free that also just needed capacitors.

A couple weeks ago I was fortunate enough to pick up a free 52" Samsung LCD that had this same "tab bonding" problem. By reading all the posts here I went ahead and ordered the thermal pads from Digikey.

Then when I had some spare time I went ahead and opened it up and applied the cut pieces of thermal pad as others had done.

I closed it all up and was done. I didn't time myself, but didn't rush it either. I guess I was done in a couple of hours or less.

I now have a 52" handing on my living room wall. The 40" is going in the bedroom.

Thanks Guys!

[rjnolberto83]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I got a un55d8000 with bad ribbons i believe and plan on trying this fix out. But thanks in advance guys.

[DoItYourselfer]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Just an update on my tab bonding repair post from two months ago. TV is still working great, not more lines and no issues. It is our main TV that has heavy use.

[newtothis]

Re: Samsung LN52A530P1FXZA Tab bonding repair

I am going to be taking on a project soon :

I have experience in metal heat treatment (Induction Heating)
I have BGA equipment and experience
I have metalworking and engineering experience

So... I have looked into how pulse heat pressure bonding works and how the machinery is built. Basics are a precise pressure upon the bonding area and heat profiling... The heat must reach a certain temp in 3 stages for x amount of time for each step... The final stage is cooling quickly.

Within a BGA IR rework machine it is PID controllers and SSR's for the control of the profiling... These will be used for hitting the correct temps measured by TC's and the different phases.

Induction heat treatment uses high amp power through copper to create the fields required for heat... Slightly different principle needed for the above but the knowledge of amps through a copper pipe and water flowing through the said pipes gave me ideas

Welding uses high amps so the internals of a welder for the power will be used

I also have experience in using pneumatics

So my idea is to use pneumatic to apply the heat bar upon the bond area using a pressure sensor to get the pressures correct... The heat bar will have high amps running through it to the mating surface which is thinner than the rest of the material causing higher resistance to achieve fast heating profiles. The bar will have a channel bored through it and each end tapped with a thread.... a series of pipes will be used connected to a Co2 can with a valve controlled by a PID upon the cooling phase (Co2 will be pushed through the heat bar to cool rapidly) The heat profiles again will be done via the PID controller.

Hope this makes sense to someone and any feedback on the idea will be great

[johns1mj]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Has any body tried 3M 9703 Electrically Conductive Tape?

link- http://www.ebay.com/itm/iPod-Touch-W...item2347c37ca8

[vinceroger69]

Re: Samsung LN52A530P1FXZA Tab bonding repair

Has any body tried 3M 9703 Electrically Conductive Tape?

link- http://www.ebay.com/itm/iPod-Touch-W...item2347c37ca8

The youtube video in that link was very informative it looks a very good product if it works.

[kc8adu]

Re: Samsung LN52A530P1FXZA Tab bonding repair

bottom tab/tcon sets get damaged easily by glass cleaner and spills.

It always seems to be the two outer tabs.

BTW, I have recently seen two 26" LCD TV with Chi-Mei panel, bad tab bonds as well, different symptoms though.

When will it end? Wonder if bottom mounted tabs will make a difference to reliability.

[victor_cj]

Re: Samsung LN52A530P1FXZA Tab bonding repair

For corroded PCB at LED-TV.