Toshiba 46SL412U (no video, no sound)

[brianr20v]

Hi all, I will like some assistance with a problem I am receiving with a Toshiba, model number #46SL412U. I recently acquired a Toshiba television, no video and no sound. So obviously on assumptions, I though it was T-con board, so I ordered it and replaced it, still the same problem. A few weeks ago my friend lent his television same model as mine, so I said I will swap the boards to see what the problem is. The first thing I did was to swap the main input board. My friend television still work, mine didn't, same problem so I knew the main input board was good. The next step I did was to swap the power supply board, same problem. The power board was good. Next I swap the T-con board, my television didn't work neither did his so I swap back his original T-con board and now both television are doing the same thing. The back light is coming on bright for 2 seconds then its dimming down and staying on. Now I don't know what to do because I am clueless. Can someone please assist me?

[brianr20v]

Re: Toshiba 46SL412U (no video, no sound)

Anyone!!!!!!!! Please

[powerflow]

Re: Toshiba 46SL412U (no video, no sound)

You may get a better response if you post some pics of the boards. Also take some voltage readings and post those as well.

[proaudiosoft]

Re: Toshiba 46SL412U (no video, no sound)

Hi all, I will like some assistance with a problem I am receiving with a Toshiba, model number #46SL412U. I recently acquired a Toshiba television, no video and no sound. So obviously on assumptions, I though it was T-con board, so I ordered it and replaced it, still the same problem. A few weeks ago my friend lent his television same model as mine, so I said I will swap the boards to see what the problem is. The first thing I did was to swap the main input board. My friend television still work, mine didn't, same problem so I knew the main input board was good. The next step I did was to swap the power supply board, same problem. The power board was good. Next I swap the T-con board, my television didn't work neither did his so I swap back his original T-con board and now both television are doing the same thing. The back light is coming on bright for 2 seconds then its dimming down and staying on. Now I don't know what to do because I am clueless. Can someone please assist me?

Sounds like your t-control board Is shorting out other components. Bad components can damage other components, even on different boards.

[nomoresonys]

Re: Toshiba 46SL412U (no video, no sound)

wrong thread.

[budm]

Re: Toshiba 46SL412U (no video, no sound)

May be you have bad component on the LCD such as TFT driver ICs, MLCC that shorted out and took out the T-CON board since now your friend T-CON also does not work in his TV any more.

[nomoresonys]

Re: Toshiba 46SL412U (no video, no sound)

uh o, you screwed up your buddies tv.

[Andrew F. Ali]

Re: Toshiba 46SL412U (no video, no sound)

Do you have the service manual for this set??

[steviewonder]

Re: Toshiba 46SL412U (no video, no sound)

I would say,with almost certainty,you have a defective panel (screen) that has eaten the T-con.if you are lucky,then maybe just the surface mount fuse has failed,located next to where the LVDS cable fits to the T-con.

[Andrew F. Ali]

Re: Toshiba 46SL412U (no video, no sound)

I want to agree with Budm Post#6, But will a defective T-CON affect the audio as well? Shouldn't the audio work since the Main and Power Bds are OK? Does anyone have a Service Manual they can share??