Originally Posted by Diamondsleeper
Success! At least for the time being, I put the board in the oven at 400F for 8 min. The TV started up normally and is working perfectly. I still have the new main board on the way because I don't know how long this is going to last and these boards are apparently getting harder to find. . I had never done this to a board before and I did learn something else that is pretty obvious hindsight being 20/20. Experience is the best teacher and I will share this stupid little thing I did. I didn't want to have anything touching the underside of the board when I did the oven thing so I had it flipped over underside up. Bad idea because gravity works. Once the solder reached melting point it released the S video connector and the optical sound connector and they fell off the board. No worries though. I just repeated the process with the board right side up and carefully re-installed them along with re-seating a couple other components that had become slightly unseated. Just passing along what should be obvious but was not immediately obvious to me. Thanks again to all who are responsible for all the info in this thread.
Follow Up . Sorry this is so long but Its necessary to be able to explain where I am on this thing and what happened.
Everything has been good with no issues for 3 days after doing the reflow in the oven on the main board. I have been waiting for a new board to arrive as some of you said the reflow only lasted a few days to a week before it crapped out again. Anyway I wanted to go ahead and configure my cable box, dvd player and AV receiver plugs back to where I had them since everything was working. Long story short when I started disturbing and pushing component plugs in etc. the board flexed. I should have backed it up with something. I heard a little creek / little crack sound. After finishing plugging in the DVD player, Cable Box , and AV Receiver I switched the power on. What happened next? One of the pins on the 24 pin plug shorted out to the one next to it and destroyed those two points.
I Got some smoke lost the picture and the TV power started cycling on and off quickly. I killed the power strip as quickly as I could but the damage was done. What is really driving me nuts is that the new board I have been waiting for arrived within 2 hrs of this happening. I wasn't expecting it for several days. My concern now was, what other damage was possibly done because of the short on the main board? I checked everything out visually and checked the continuity of all the fuses I could find. Everything looked good.
I was under the impression the new board I now received from the PartsStore.com was going to be new. It is not. It is either used or refurbished. I can tell due to small amounts of dust and condition of stickers etc. I plugged the "new " board in but did not plug any other components into the TV. I held my breath. As soon as I applied power to the TV the TV switched on but there was nothing displayed on the screen and no sound. I could tell the screen was actually powering up because in dim light I can see the glow and the little bit of pinkish blotch it has had. No smoke or anything it just does nothing. Also, with no change to the screen and with no sounds the TV cycles power at pretty much the same interval it did when I originally had the scrambled screen and screeching sounds. The other thing is that the TV does not respond to any commands to turn it off with either with the remote or the front panel switch. It always just switches on as soon as its plugged in.
The PartsStore.com said they would take the board back within 30 days when I had them on the phone ordering it without me even asking about the return policy. This if for some reason it didn't work or I didn't end up needing it which kind of struck me as odd at the time because generally its hard to return anything that is electronic in nature. This makes me think there is a good possibility they knew there was a chance it might not be a good one. Maybe they just sent me a bad board? I've had bad parts from stock before when working on aircraft. Black boxes straight out of overhaul that have been dead on arrival so I know this is a possibility but the fricking short I had has me thinking the whole TV is junk now and it very well may be, I just don't know. I am not a TV guy and don't know how fragile they are electronically.
Do you think its worth having the PartsStore.com exchange for another used/refurb board and try it again or should I just get my $200 back?
Is it a pretty sure thing I fried something else on one of the other boards because of the short on the main board?
Thanks guys in advance for any insight into this.
Edited by Diamondsleeper - 1/10/14 at 6:43pm