Re: Lg 50pk750 help!!!!



Do you mind telling us how you did this?...

Re: Lg 50pk750

I'm going to go to the same computer supply place and see if I can get a new pad. I'm also looking into adding a 5v fan as pictured in another 50pk750 thread.

Of course, a local store has a Samsung UN55ks 8000 on sale for $800. It would be a nice replacement if this repair craps out quickly.

Thanks again!

Re: Lg 50pk750

Ok, it worked, tv appears to be fully functional! A couple things:
- Computer supply/repair place could not do a reball, so I did the heat gun method.
- I saw a video saying reball/reflow is BS, it's a chip quality issue. Stated that lead-free solder has a higher melting point, so the reflow/reball at the lower temp isn't really the fix, it's that you're heating the chip.
- Rather than high heat for a short time, I did low heat (250-300 F) for 5 mins, as measured by digital thermometer.
- Thermal pad + thermal paste is not recommended...

Re: Lg 50pk750

Ok, I got the heat gun, and I'm headed to a computer store for the thermal paste. I will ask if they can do a re-ball there. If not, what temp should I use the heat gun at? On the low-end is 130F, obviously way too cool, but infinitely adjustable to approx 900F. Where on the scale of "hair dryer" and "scorched earth" should I use? Give me C or F and I'll convert.

Thanks all!

Re: Lg 50pk750



Where do I get the tool to remove the pins?...

Re: Lg 50pk750

Ok, I will try this, but it will take a few days before I can get back with results. I'm currently living in Germany, so I don't have any of my old 110V tools. I'll need to source a heat gun and some thermal compound.

So, definitely don't bake it? I could easily do that in the next day or so, but if the heat gun is the better way to go, I can explore options of where to get one.

Thanks again!

Re: Lg 50pk750

This was fantastic advice, and 2nd time this forum has helped fix my 50pk750 (had a loose ribbon cable a couple years back giving me gray lines).

I confirmed I have a bad main board via the 51/52 test. The main board seems to be sold out, anyone know of an alternate part # or have a spare they want to sell?

In the meantime, should I try baking the board to see if reflowing the solder may fix it? Nothing to lose, right? Or are there any other tricks to try first?

Thanks!