TV powers on, LG logo and clock logo come on briefly, then no picture
LG 55LX6500 3D Model TV UB Build on the Main Board Images Below
A co-worker was just going to put this TV out on the curb, so I have no money in it currently. I have a science background but little electronics knowledge beyond basic computer hardware build skills.
I believe this model was new in 2010 or 2011 and has been sitting for a year. I'm trying to develop a trouble shooting plan.
The TV will power on with an audible click. On power, the power button on the lower right lights, and the button keys on the lower right cycle across (light up across then back), then the power light stays lit. No blinking or other odd behavior.
On power up, the screen briefly lights up with the LG logo and what looks like a clock icon, but with 4 dashes instead of a current time. Then the screen goes black.
I have the back cover off, and I have many small lights on the back that come on during power up when the screen has the LG logo, but go off after a second or two. Once the screen is black, I can press menu buttons on the front, and get a beep but nothing on the screen. The remote will power the TV on and off, and the menu button on the remote will make the button on the TV light up and beep.
I've seen the Youtube vid about baking the main board, but without knowing whether that is the culprit it seems risky to damage what might not be the broken part. Visually, I can't yet identify any capacitors that are obviously blown. I am considering giving the main board a short 5 min to 10 minute blow with a heat gun (carefully) to see if that might reconnect a bad solder joint but beyond that I'm not sure where to start. I don't want to buy and replace boards at random. I'm willing to spend a bit to get it back working for a gaming TV, but don't want to waste time/money. Any advice would be appreciated.
Back Panel Removed
TCom /Middle Section
Power Supply Board
Is this a good question?