Re: Toshiba 46L5200U1 Power issues.

Thanks for the info. I'll try to get some pictures tonight to see which chip IC U1 is, and i'll also check out the test points you mentioned. Thanks for the great info!

Re: Toshiba 46L5200U1 Power issues.

Thanks for the quick responses budm, I really appreciate it. I know you helped another user with his Vizio television and I followed all 10 pages of that, which helped me in debugging my issues. I guess my next steps are to look at the traces into the primary side of the transformer. It must be getting something on some windings as i'm getting the 5V output to the main board, but never see 12V out of it. Maybe those windings blew?

Re: Toshiba 46L5200U1 Power issues.

I'd like to know what I should be expecting for voltages on C1A and C1B. I'm currently getting 167v each.

I guess i could try to get some numbers off of the rectifier and see what I should be expecting, but ill have to desolder the heatsink to see the numbers.

Anyone have a spec sheet or manual for this power supply?

Re: Toshiba 46L5200U1 Power issues.




I get 3.3V when powered on, and 0 when powered off....

Re: Toshiba 46L5200U1 Power issues.



Yes sir....

Hey everyone, thanks for taking a look at this issue.

I've received a TV that I was tasked to fix by my father in law (if possible).
The main issue is there is no backlight and no display. I've attempted the flashlight trick and am getting no indication any pixels are being lit etc. the green power led does come up on the front of the TV, and the unit is responsive to the remote control etc.

So I disassembled it last night after reading a Vizio W37 thread on here that was of great help to me. I was able to diagnose some things

I've verified...

Re: New Members - please post your introductions here

Hello, my name is Eric. I come here in search of your help in diagnosing some TV issues, which I believe to be a psu issue on one TV and hopefully a TCON board on another TV.

I've read through some numerous threads and loved how low-level the help is able to get here.

I've also looked all over the internet for a schematic/service manual for the TV / Power supply for the Toshiba 46L5200U1.


Any help on this would be greatly appreciated!