View Full Version : Sony KDL-46V4100 LCD TV problem


radiotvnut
06-09-2013, 11:22 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
06-09-2013, 11:38 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
06-09-2013, 11:48 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
06-10-2013, 03:00 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
06-10-2013, 11:34 PM
post a pic of that board and a part number if possible and I'll check my stash

radiotvnut
06-11-2013, 12:50 PM
Here's a picture of the board. The part number appears to be 1-876-561-13 / A1506072C.

http://i538.photobucket.com/albums/ff341/radiotvnut/sony001_zpsc4d1413f.jpg (http://s538.photobucket.com/user/radiotvnut/media/sony001_zpsc4d1413f.jpg.html)

Ed in Tx
06-11-2013, 11:09 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?