HP Digital Picture Frame goes black

[sumdumgai]

HP 8" Digital Picture Frame model df810v1. Screen initially lights up with images but after a few minutes, the screen goes completely black. Would this likely be a capacitor problem? I've posted a picture of the board. If this is likely a capacitor problem, can those bad capacitors be identified for me on this picture? Thanks. None of the capacitors appear to be bulging.

[sam_sam_sam]

Re: HP Digital Picture Frame goes black

What is the part number of IC chip that has a heat sink tab to the board and also has a lot of pins on it and looks like some thing spilled on it or burned up it hard to tell which one it is

It is on left hand side of the board toward the bottom of the board

Can you take a closer photo of that chip thanks

[sumdumgai]

Re: HP Digital Picture Frame goes black

Thanks. Here's another picture.

[stj]

Re: HP Digital Picture Frame goes black

conductive glue - bastards know not to use that stuff!!

[sumdumgai]

Re: HP Digital Picture Frame goes black

Good or bad?

[stj]

Re: HP Digital Picture Frame goes black

you need to carfully remove it.

[sumdumgai]

Re: HP Digital Picture Frame goes black

So the chip is bad? The one that "has a heat sink tab to the board and also has a lot of pins on it and looks like some thing spilled on it or burned up"?

[stj]

Re: HP Digital Picture Frame goes black

no, just remove the brown glue.
it turns conductive with age and shorts stuff out - causes all kinds of problems.
specially bad in psu's!!!

[sumdumgai]

Re: HP Digital Picture Frame goes black

Thanks. I'll try that. Is there a 'best' way to remove it, aside from being careful?

[stj]

Re: HP Digital Picture Frame goes black

not really

it starts like gum, and as it gets older it becomes brittle like honeycomb
so it's very variable.

[sam_sam_sam]

Re: HP Digital Picture Frame goes black

I would careful removing that glue
That a lot better photo

Thanks

[delaware74b]

Re: HP Digital Picture Frame goes black

Looks like there is also that conductive glue on the high voltage transformer, lower left corner of the photo in the first post. Burn mark on right side of it, likely causing the display to shut down.

I have had to deal with that cr!p in HP evil (EVO) mini toaster (SFF desktop) power supply that shorted out from that glue. The supply had the glue poured all over the board. It took me 2 hours to scrape it off the board. Unfortunately, I know of no other way to remove except to carefully scrape.

[sumdumgai]

Re: HP Digital Picture Frame goes black

Thanks for all the help. I'll give it a try and let you know how it turns out.

[sumdumgai]

Re: HP Digital Picture Frame goes black

No luck. Removed most of the glue (using acetone to first soften). See picture. Now, the screen will not light at all.

[sam_sam_sam]

Re: HP Digital Picture Frame goes black

Look at the pads on the transformer the soldiering joint on the left hand side dose not look very good and another one a few pins from that one dose not look
Good either I would resoldier all the pins on the transformer

If you have an ( ex-o-knife or very thin blade screw driver)I would try to remove more of the glue but be very care not to dig deep in to the board

[sumdumgai]

Re: HP Digital Picture Frame goes black

Thanks. Is there any way you can point to the areas/pins you're referring to on the picture and re-post it?

[sumdumgai]

Re: HP Digital Picture Frame goes black

Not sure which pins you're talking about. But anyway, what is the purpose of this 'conductive glue'? Is it already conductive and used in place of solder, or is it just glue and it becomes conductive with age? Thanks.

[stj]

Re: HP Digital Picture Frame goes black

becomes conductive with age.
probably used intentionally as a "suicide" device to limit the life of the equipment!!

[sumdumgai]

Re: HP Digital Picture Frame goes black

Ain't that a Btch! But now I'm wondering why removing some of the glue made the problem worse. I was really careful to not damage the board or any connections.

[stj]

Re: HP Digital Picture Frame goes black

look at your foto, it looks like you may have cracked a resistor and possibly dislodged the soldering on a cap or 2.