Sony KDL-46V4100 LCD TV problem - Videokarma.org TV - Video

radiotvnut · #1 06-09-2013, 10:22 PM

Someone asked me to look at the above mentioned LCD TV that someone gave him. The only action I get are the backlights lighting up and they will stay on as long as the set is powered up; but, no picture. A technician friend told me that Sony's are bad about blowing a surface mount fuse on the t-con board for no apparent reason. On my set, the fuse is good; but, there is only .56 volts at the fuse. I checked the resistance from the fuse to ground and measured 56Kohms; so, I don't think we have a short. Tomorrow, I'm going to check a few things to try and confirm if the trouble is the power supply board or the main board. In the meantime, any ideas will be greatly appreciated.

mstaton · #2 06-09-2013, 10:38 PM

Disconnect the ribbon cables to the LCD Panel and see if that helps(voltage comes back). Those screens are notorious for going bad. Some t-cons get their power from the power supply(4 pin cable) and some from the main board. Probably the main board is bad. I have a BUNCH of Sony mainboards and power supply's pulled from TV's with bad panels. You are welcome to them.

radiotvnut · #3 06-09-2013, 10:48 PM

Thanks for the information and for offering the parts. I'll check the panel tomorrow and the t-con board in this set connects directly to the main board.

radiotvnut · #4 06-10-2013, 02:00 PM

I disconnected the LCD panel and the voltage did not come back up; so, it's looking like the main board is the problem.

mstaton · #5 06-10-2013, 10:34 PM

post a pic of that board and a part number if possible and I'll check my stash

radiotvnut · #6 06-11-2013, 11:50 AM

Here's a picture of the board. The part number appears to be 1-876-561-13 / A1506072C.

Ed in Tx · #7 06-11-2013, 10:09 PM

Geez... I have a 40V4100 myself, bought it 5 years ago, has probably 30,000 hours on it now. Watching it as I type. In that pic I see a lot of SMD capacitors. Do any of those go bad?