Sharp Aquos LC42D43U-42 Has Sound but No Picture

[jjakatw]

I have a Sharp LC42D43U-42, that has no picture but has sound. Read somewhere that it may be the main board so we switched it out, now the tv comes on, blank screen, green power light and green opc. We read that maybe we need to upload the software for the new main board, but can't find anywhere to download the software so that we can perform the upload to the new main board. Does anyone know where we could find that? Also what is the thought that the main board was not the problem, and that it was the backlight inverter? Prior to changing the main board the tv would come on gray and fade to black, no picture what so ever. Any help or suggestions are appreciated. Thanks.

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

If the TV had sound I would be considering inverter or T-con. Was the screen lit up with old board?

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

Thanks for the quick reply. The picture before the main board was changed was gray fading to black. Now with the new main board, the screen stays lit, more of a dark blue than gray or black, but still no picture. We did switch the inverter, but switched it back, as the one we received we got off ebay and it looked burnt.

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

Sounds like a t-con or panel issue. Can you post pictures of inside your TV?

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

I have attached a few pics.

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

A couple more of the backlight inverter...

[hienton2]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

I have one like that. Problem is panel , Try to play with scan board on top of tv.
Right side of tv look from front.

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

Scan board? Sorry just learning this stuff and not sure what that is. Is that the board that the tabs are attached to? Should I remove the the outside frame to check this?

[hienton2]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

It takes more work to remove the outside frame . Just cut the black plastic cover
the board then hair dryer to the board . It makes some affect the tab bond ribbon to see any change on screen. Then you know what is the culprit.

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

I am guessing you are saying it may be a bonding issue? Not a board issue?

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

On another note...because I installed a brand new main board...where can I get the software/firmware to update the board for this tv?

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

I have a 26" Sanyo (rebadge) using a Chimei panel, which has tab bond issues. Sometimes all you will get is a dark (no image), lit up screen, with a dark blue tint. Other times you'll get a faded light grey screen which slowly changes colour.

Different fault. Same cause and fix:
https://www.youtube.com/watch?v=purk_SyiT44

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

Tom...I have watched that video before...do you think that this Sharp has a similiar issue then?

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

It would be one thing to check, as the symptoms are similar to other tab bond faults. Sharp panels (like in your Sharp TV) rarely have tab bond faults though. Not unheard of, but rare. Since the swap of the main board changed the symptoms, I would not rule out a main board fault. Possibly the replacement main board is bad too, given they are usually pulls from scrapped TVs.

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

The main board I bought was suppose to be brand new unused. Do you think I need to update the software/firmware in order for the main board to work correctly?

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

The main board I bought was suppose to be brand new unused. Do you think I need to update the software/firmware in order for the main board to work correctly?

I would doubt this to be the case, but was the board from the exact same model?

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

It was suppose to be for the same exact model, and was suppose to be brand new unused. The part numbers on the board say the same part numbers, but what I have read online says this board may need software updated after installation.

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

It's worth a shot, I guess -- can you do it via USB?

[jjakatw]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

I want to...but I can't find it anywhere online. Any ideas where I could find that?

[tom66]

Re: Sharp Aquos LC42D43U-42 Has Sound but No Picture

You can try contacting Sharp tech support and they may supply you with files and instructions. Does the TV have a USB port?