Panasoniv TH-P42XT50M HDMI doesn't work

[buchman]

Hi guys,

I have this Panasonic TV, it's working fine through RCA cables and only the HDMI doesn't.

I want to try and fix it by replacing the right component instead of replacing the entire board.

The small IC in between the 2 HDMI ports is: 24C32f
The big IC to the right is: AN34044AA

Please help me pinpoint the culprit.
Thanks in advance.

[diif]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

I'd guess it's the chip that handles the HDMI inputs which will be above them under the silver heatsink.

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

Could the problem be just updating the firmware?

[diif]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

Could the problem be just updating the firmware?

It's unlikely but it costs nothing to try.
You could also try applying some heat from a hair dryer on high to that processor for about a minute before applying power and seeing if HDMI works, I suspect it's been shorted (dead) but there is a chance there's some cracking of the BGA underneath it.

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

It's unlikely but it costs nothing to try.
You could also try applying some heat from a hair dryer on high to that processor for about a minute before applying power and seeing if HDMI works, I suspect it's been shorted (dead) but there is a chance there's some cracking of the BGA underneath it.

How do I test it for shortage?

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

What is this chip and how do I take it off?

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

This is the other side

[diif]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

What is this chip and how do I take it off?

That's the main IC for image and sound processing. You need dedicated equipment to refit it once removed, so don't try and take it off.

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

That's the main IC for image and sound processing. You need dedicated equipment to refit it once removed, so don't try and take it off.

I have the stuff I just need a bit of guidens. First time I see elevated IC

[Deusjevoo]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

I have the stuff I just need a bit of guidens. First time I see elevated IC

What stuff do you have?
If not the correct one, better don't try yourself if you want to salvage it.
Surely if it's the "first time you see an elevated IC..."

[Deusjevoo]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

Delete please. (Got an error resulting in a double post)

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

What stuff do you have?
If not the correct one, better don't try yourself if you want to salvage it.
Surely if it's the "first time you see an elevated IC..."

And nevertheless, with the proper guidance I can do it, I just need to see it once how it should be done.
I have a hot air gun, solder paste, flux etc.

[diif]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

If you can heat the whole board to around 100c and you have a decent hot air station you have a chance you can reflown it without damage. If you just try and heat the processor with your hot air to the point the solder ball underneath melt 217c and the rest of the board is cold then there is a big chance of damage due to the extremes of temperature.

Before you do that though see if applying some heat to the processor for around 30 seconds before applying power has any effect.

[Deusjevoo]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

@buchman Only seeing it and going for it is risky. Better practice bga reflows/reballs on scrap boards first.

Reflow mostly works only temporarily, often only for a short time. Can be a hit or miss. Reballing it should be a longer term solution.
If you've never done that or don't have the tools for it you can of course try a reflow. Luckily it's a low mass chip, more chance it might work if the pcb doesn't suck away all the heat.
But as diff said, be careful or you can toast the chip.

What hot air station you have?

The picture shows what should be done.

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

How can I test it first to be sure that this is the culprit?

[buchman]

Re: Panasoniv TH-P42XT50M HDMI doesn't work

someone knows?