Re: Toshiba 46xv540ou

Thanks, I'll do that tomorrow after work. I've talked to a couple techs at the company I work at (I took the TV in and plopped it in the lab), they've seen the problem and conclude it's probably a logic board issue. They say it's likely not worth the effort getting it fixed, just buy a new board.

Unfortunately, I'm having trouble finding a replacement logic board for the 46xv540u. The boards that I find do not physically match the layout that I see on the TV.. (example: [url]https://www.ebay.com/itm/Toshiba-46XV540U-Main-Board-75012468-PE0541B/262714867026?hash=item3d2b06bd52:g:ixIAAOSwcUBYJfhV[/url])...

Re: Toshiba 46xv540ou

Just a blown fuse.

The Dim pin reads .25 when the backlights are on. Any thoughts? Inverter circuit?

Re: Toshiba 46xv540ou

Guys..

First of all thanks for diving in. Secondly I think I may have shorted the power board after doing this...



Before getting that reading, since the TV was upside down I went to check one of the C1 capacitors on the power board to see if the backlights were on. POP. The TV now refuses to turn. Some minimal burn on one of the C1 leads but the capacitor still holds 162DCV when plugged in.

This just got more interesting. Where should I head to first so the TV can turn back on and we can get back...

Re: Toshiba 46xv540ou

Pin No. - Description (from Board) - DCV standby (V) - DCV On (V)
--------------------------------------------------------------------
1,2 - GND - 0.0000 - 0.0000
3,4 - 12VA - 0.0300 - 11.842
5-7 - GND - 0.0000 - 0.0000
8,9 - 12VCC - 0.0300 - 11.842
10-12 - 5VCC - 5.0000 - 5.0360
13 - POWN - 0.0000 - 3.2975
14 - ACD - 3.3620 - 3.361
15 - DIM - 0.0082 - 0.2530
16 - BLON - 0.0000 - 3.2851

C1 while ON: 162.21V...

First post!

Problem: Startup and operation are fine until about 5-15 minutes. Screen goes black but power remains (audio cuts as well). Power cycling restores the video until about 5-15 minutes.

I was told that I should look for bad capacitors on the power board. I've identified no obviously bad capacitors, but I would like people's help.

Attached are some hi-res pictures I took of the power board, front and back.

Thanks in advance...

Re: LCD TV turns off randomly

Hey guys - new to this too. I'll likely be posting soon about an LCD TV issue tomorrow or Saturday hoping to get some help with a similar power issue. Gonna post with lots of pictures, it's gonna be a fun one. Thanks in advance