Purchased a non-working iphone 4 and am in need of help

Okay, so I purchased a non-working iphone 4 off of ebay, because sadly that was the only way I could afford one.  Anyway, I began breaking it down piece by piece last night so that I might be able to narrow down what was wrong with it.  And that is where I need the help of the apple community.  I have cleaned all the contact metal on the inner part of the iphone, cleaned the logic board, the charging port.  The person I bought it from said that it would randomly restart while charging, and once you unplugged it from charging, it would shut off.  So far, I have not even been able to get it to charge at all, and therefore, no random restarting either.  I was able to get it to come back on after I had cleaned everything off and put it back together, even tried to restore it through itunes, but it got stuck on the apple logo, and brought up two different errors on two different occasions, 1603 and 21.  I am relieved that there is nothing wrong with the lcd screen or the digitizer, as I know those are expensive.  I already have a new battery ordered for it that should be here tomorrow along with a charging port as well because the previous owner said it could probably use a battery, and I just went ahead and ordered the charging port just in case there might be something wrong with it as well.  My question is, is it possible that the logic board could be bad in my iphone, and could that be also causing my iphone not to charge, or restore to ios 6.1.3?  All help is appreciated.  Thanks.
James Arden

Is it possible?  Yes. Very much so.
The iPhone is not user serviceable. Apple does not sell iPhone parts. Apple won't touch it now that its been opened. Try checking ifixit.com for help. There's not much we can tell you.

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