LG 42LB5D - No Picture, has sound and backlight, bad caps found

[MajesticMike]

I have an LG 42LB5D that has no picture but has sound and has backlights. I opened it up and found many bad caps on the power board. A lot of them were puffed at the top, I replaced all of those with new ones, and changed out the other similar caps as well. The set still didn't work so I went back and swapped out the remaining ones in that area.

I did not test or touch the two biggest capacitors on the board.
I left 2 smaller remaining caps that I tested as good with a capacitance and ESR meter.

Not sure where to go next, any suggestions?

(Note: the green caps where the old ones)

[audiofreak19]

Re: LG 42LB5D - No Picture, has sound and backlight, bad caps found

If your not getting a picture but back lights work I would look at the t con board. Check the fuse on it first and make sure that's good.

[MajesticMike]

Re: LG 42LB5D - No Picture, has sound and backlight, bad caps found

wow, thanks audiofreak! The fuse on the t-con board is bad!

It's a 2.5A fuse.
I don't have any of those around but i just tried putting a 2A fuse on it but that blew right away. I dont think I should dare put a 3A on it?

So i wonder what would be causing it to blow in the first place???

[MajesticMike]

Re: LG 42LB5D - No Picture, has sound and backlight, bad caps found

So i've replaced the fuse with another 2.5A 125V just like it is suppose to have and that blew right away.

As seen on another thread someone said to try unplugging the ribbon cables and test if it still blows, i popped in a new fuse and tried that and the fuse did not blow!
any suggestions as where to go next?

Heres a pic of my t con board. the ribbons are unplugged and i've added some wires to the old fuse to hook test fuses to.