Anyone with expierience in cell phone PCBs please contact me

[Rude Co.]

I have an LG Optimus Slider android phone that has a burned out diode
just inside the board behind the charger port. I will forward a pic of
the board upon request, but am trying to find someone who can tell me
which component is what, and if I can simply bridge one of the
components to get the phone to turn back on. Thanks a million.

 

[Jeff Liebermann]

On Sat, 10 Mar 2012 00:57:15 -0800 (PST), "Rude Co."
<rudeco.dm@gmail.com> wrote:

I have an LG Optimus Slider android phone that has a burned out diode
just inside the board behind the charger port. I will forward a pic of
the board upon request, but am trying to find someone who can tell me
which component is what, and if I can simply bridge one of the
components to get the phone to turn back on. Thanks a million.

I have no experience with that particular phone. When high end phones
were selling retail for $300 and up, I could make money doing repairs.
However, the LG Optimus Slider sells on eBay for $150 to $200, which
makes it a marginal proposition at my shop rate of $75/hr.

Without a schematic, I can't tell for certain what the diode does.
It's fairly difficult to blow up a phone via the charger port as they
are usually well protected. There's usually a diode ACROSS the DC
power connections with a fuse in series intended to prevent reverse
polarity failures. Less commonly, the charger circuit blows, allowing
the phone to operate from the battery, but not charge the battery.
However, if the phone section is dead, whatever you did to cause the
problem probably destroyed more than a diode and a chip fuse.

The general description of the LG Slider includes:
Features an enhanced internal circuitry chip to manage
charging status as well as an integrated electrical fuse
to prevent damage to your LG Optimus Slider and it's battery
from over and under-charging.
If you can find the "integrated fuse", and it's open, replacing the
fuse (and the diode) might bring it back to life. Note that it's very
easy to mistake a chip capacitor for a blown fuse.

Meanwhile, unless you're local to the Santa Cruz CA area, I don't want
to deal with this.

You might try one of the cell phone specific forums, where hopefully
someone with more experience might offer some useful advice.
<http://howardforums.com>
<http://forum.gsmhosting.com/vbb/f494/>
or just find a commercial repair shop with Google. There are plenty
listed.



--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558