Vizio M55-C2 Mainboard Issues

[JunkmanJimbo]

I got this tv in a wholesale lot and I'm trying to repair it for resell. I noticed on the original main board that the component at location L9001 was burnt. So, I ordered a replacement board, installed it, powered on the tv and the same component blew. Can someone tell me what component would be at location L9001 (please see pictures) and if it might be possible to replace it since it's burnt so bad. Also, has anyone had this same issue with this model tv? Could the power supply be causing this or could it be the t-con or maybe the screen itself? Any help will be greatly appreciated. I don't know whether to trash this tv and take my loss or attempt to repair it. Thanks in advance.

[nomoresonys]

Re: Vizio M55-C2 Mainboard Issues

L stands for inductor.

[JunkmanJimbo]

Re: Vizio M55-C2 Mainboard Issues

Thanks for your quick reply. Do you know of a way to find the part number of that inductor? Do you think it's possible to attempt to install another inductor as bad as the board is burnt? And, do you have an opinion as to what could be causing this inductor to keep blowing? Thanks.

[nomoresonys]

Re: Vizio M55-C2 Mainboard Issues

Not sure, wonder if the power supply has a problem, as you said you tried a new mainboard and it popped the same inductor, some of the pros here may know.

[budwich]

Re: Vizio M55-C2 Mainboard Issues

you might want to post a picture of the back to show how things are connected. Of course, you might want to check what the inductor was connected to in the cabling, if it is and then follow that to the other end.

[JunkmanJimbo]

Re: Vizio M55-C2 Mainboard Issues

Here's a couple more pictures, one of the back and one at an angle showing the connectors.
I can't find a schematic of this board to determine which inductor I would need to order.

[budm]

Re: Vizio M55-C2 Mainboard Issues

That inductor burns out can be due to 1) short circuit on the input side (Source) of the P-CH MOSFET (4435) Q9000 which supplies switched 12V to run the T-CON board. 2) Short Circuit on the output side (Drain) due to shorted caps, or shorted T-CON.
Bottom line, look for very low Ohm readings on the input and output side of the MOSFET first.

[JunkmanJimbo]

Re: Vizio M55-C2 Mainboard Issues

Thanks bud, I'll let you know what I find.