sharp aquos 42. lc-42d43u

[robbiec16]

Re: sharp aquos 42. lc-42d43u

It won't allow me to do anything once its in industry init, not change screens or power off, I have to unplug the power to gain use of it again

[tom66]

Re: sharp aquos 42. lc-42d43u

Select industry init, press volume+ then enter, does it do anything?

[robbiec16]

Re: sharp aquos 42. lc-42d43u

Yes,it comes to a screen that says industry init success
It shows the main version,the monitor version,boot version, hotel mode as off, and POD equaling 000

But once its on this screen it just stays there. What do I do next

[tom66]

Re: sharp aquos 42. lc-42d43u

It says once complete turn off the AC power.

[robbiec16]

Re: sharp aquos 42. lc-42d43u

Did that. Still same result when powered back on

[tom66]

Re: sharp aquos 42. lc-42d43u

OK, so it still goes wrong after ~1.5hr?

I would suggest the problem is most likely heat related.

You can attempt to locate it by heating up parts of the main board and T-con board with a hairdryer. If the picture goes bad as you heat something up, turn the TV off, heat it again, then you know where the fault is.*Specifically concentrate on large processors.

[robbiec16]

Re: sharp aquos 42. lc-42d43u

I forgot to mention this,
I just got the TV yesterday after watching it an hour and half, the TV started doing that. I left it off unplugged for a few hours then powered back on with the same thing occurring directly on the power up, I didn't have to wait any amount of time. I left it off over night powered up and it still has the same effect on the screen. I don't have to wait any time the coloring is already messed up.

[tom66]

Re: sharp aquos 42. lc-42d43u

OK, we will have to reverse it, can you get freeze spray (or compressed air can) -- we need to find what happens when parts get cooled down.

[robbiec16]

Re: sharp aquos 42. lc-42d43u

But why would any of it be hot if its been unplugged for +hours

[tom66]

Re: sharp aquos 42. lc-42d43u

Not necessarily hot, but a very common problem is the solder joints under the processors expand and separate. Cooling it down temporarily relieves the problem. It seems to be increasingly common with Samsung, Sony, Panasonic and now Sharp TVs. Probably the move to lead free solder.

[robbiec16]

Re: sharp aquos 42. lc-42d43u

Which board will I be looking for to do this to,all of them?

[tom66]

Re: sharp aquos 42. lc-42d43u

Start with the main board as that would be my suspect.

[robbiec16]

Re: sharp aquos 42. lc-42d43u

So get a can and spray off the board, what should I do afterwards

[tom66]

Re: sharp aquos 42. lc-42d43u

Just see if it improves. Focus on large processors. If you want help locating suspect areas, post a picture of the main board -- the one with HDMI etc on it.

[kevinm34232]

Re: sharp aquos 42. lc-42d43u

Tom what do you use to reflow the flatpack IC's?

[tom66]

Re: sharp aquos 42. lc-42d43u

I've never had to reflow a QFP. They basically never go wrong. A BGA does. I either reflow in oven (~80% success rate) or use hot air gun.

[kevinm34232]

Re: sharp aquos 42. lc-42d43u

OK I have not seen anything on putting the board in an actual oven I know about the hot air gun, what temp and how long do you 'bake' a board??

[tom66]

Re: sharp aquos 42. lc-42d43u

225-235°C for 2 minutes maximum.

Start oven at 150°C, place board in oven, set temperature. Ideally monitor it, until it reaches 230°C, then turn it off, let it float at 230°C for 2 minutes, then remove the board and allow for 30 minute cool down.

[auyeah]

Re: sharp aquos 42. lc-42d43u

I think I have a similar problem on a sharp LC- 42D43U. The colors are messed up. I took a couple of pictures which I will try to post.

I tried (almost) everything mentioned in this post including reflowing the solder on the main CCA in the oven. I didn't have a can of freeze spray, though, so didn't try that yet. Any thoughts on what may be causing the issue (Seems like the problem is on the main CCA or TCON CCA). From several posts I've seen, the Main CCA seems to have been the problem much of the time on this model tv. Thanks for any advice.

[budm]

Re: sharp aquos 42. lc-42d43u

@auyeah, that pictures look like it has bad gamma voltages on the T-CON board. Post the pictures of the T-CON so we can tell you where the test points for the Gamma voltages are.