Anyone with expierience in cell phone PCBs please contact me asap.

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.

or just find a commercial repair shop with Google. There are plenty listed.