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Hi Alan, sorry to hear you're having trouble with the Sharp,
You are absolutely on the right track here.
If you are getting volume/menu indicators, that rules out the failure of a bad tcon or inverter board,
which leaves only the possibility of the main board.
There aren't really any specific diagnostic tests to go through here though, it's more of a process of elimination in testing and isolating the problem.
In your case, all signs do point to the main board.
While the power supply is also a possible culprit, that is highly unlikely if you are still getting normal audio and the set is powering up normally.
The part you need is DUNTKE028FM01
Yes, it is a pretty simple process actually
the difficulty is going to be finding the part, more than replacing it.
I'm checking a few sources for you now,
Okay I've tracked one down. My first few suppliers were out, but I've found one here: http://www.tristatemodule.com/p-967-duntke028fm01-sharp-tv-module-main-unit-xe028wj-ke028-lc-46d92u-lc-46sb57u-lc-52d92u.aspx which appears to be in stock.
It's pretty reasonable, at under $70.
You can find the same part elsewhere (ebay), but I would recommend using the link I sent, because it is a new part (not used/reconditioned), and guaranteed with a replacement policy
meaning you can return it or exchange it if it doesn't work, or isn't needed.
And yes, I'll absolutely help you with replacing, but again it's a pretty simple process
Here is what the board looks like.
You'll order the part, when it shows up, pop the back off the tv (there are several screws around the perimeter)
if the tv is on the stand, do this standing up, if it is wall mounted, lay it on a sturdy table on a thick blanket (so you don't scratch the screen)
This is all with power unplugged, of course, and all components, hdmi cables, etc disconnected.
After you get the set opened up, you want to ground yourself by touching something metal (the cover plate screw on a light switch or outlet works for this) to discharge any static in your body, so you don't damage anything inside.
Locate the board, which looks exactly like the one in the picture (and is the only one that looks like this, you can't miss it).
I'd snap a few pics before doing anything, for reference, which will help you in putting things back together.
From there, disconnect all of the cables that are connected to the board (from the power supply and other boards)
then remove the 4 screws in the corners, pop out the board, swap in the new one, reconnect the cords, then give the tv a test run.
No soldering, plug and play.
If you've ever worked on a computer before, you can do this.
No, I think that's it for now.
But bookmark/favorite this page, then you can easily get back in touch with me if you get stuck anywhere along the way.
You're very welcome. Best of luck for an easy and speedy repair.