Re: Blown board again?

On 12/6/2023 10:12 PM, Paul wrote:
> On 12/6/2023 3:49 PM, sticks wrote:

First, I was thinking about this and I think I should apologize for 
putting this here in the first place. Yes, it is a W10 box, but it 
really isn't an operating system problem, it is really just a hardware 
issue.  I'm not redirecting follow-ups, but will include 
a.t.comp.hardware to the groups as I will probably report back there if 
what I'm doing works.  So, sorry for the off-topic stuff to the readers.

>>
>> I think I can take this to mean the answer to my question on whether or not a faulty CPU can "break" a motherboard is a yes?
>>
>> T's post and now yours has kind of changed my opinion on moving forward.  I priced out some stuff
>> and I think I'll work one more time at board and CPU swap.  Probably should just give up and get
>> something new, but with as little as I use this laptop I think I'll take the cheap route.
>>
>> Thanks!
> 
> OK, so what do we know for sure. i7 blows original board.

I don't recall what led me to believe it was motherboard, but in 
hindsight it could have been the CPU all along.

> i7 seems
> to have blown replacement board. PCB part numbers the same ?
> Visual inspection of PCB, de-pop list is the same, components
> that are installed are the same ? No sign of a cost reduced
> i3-supporting PCB, where portions of circuitry were removed ?

Boards were the same and should have worked.  99.9% sure the i7 must 
have spanked the working board.  Lesson learnt.


> Some product lines, have a multitude of PCBs, some PCBs are AMD,
> some are Intel, some are higher power than others. It can be hard,
> when working with that laptop model, to be sure exactly what
> you're buying. Models which have a smaller spread and no attempt
> was made to deceive the public, are easier to work with.
> 
> The repair market using brand-new manufacturer-PCB is usually
> ridiculously priced. People selling old machines have two choices.
> Sell machine whole (a machine with busted LCD is a typical config),
> or they part them out to maximize their profit (PCB with unknown
> provenance, casing, LCD screen, CCFL tubes, optical drive,
> you know, whatever was convenient to take apart and sell).
> In that case, you can't really be sure what was broken on the
> thing, to cause them to sell it. Whereas a natural assumption
> would be, a broken-LCD-screen unit, was working before it
> met its end -- dropping a laptop off of sufficient height,
> can even crack a PCB/mobo, so if there are signs the keyboard
> got damaged, larger masses or more forceful accidents could
> be involved (laptop in car accident).
> 
> Just taking another i3 board and putting the i7 in it, that
> sounds like material for a book about "domino failures" :-)
> It might be better to shop for a PCB/CPU pairing, and change up
> your game of roulette.

I found a replacement of the same model that has win 11 on it and is 
shown booted up.  Has a bigger drive and actually looks cleaner than 
mine, and is just missing battery and charger/power cord, and has a 
sticky keyboard.  Couldn't pass up this one since it was only $50 minus 
a $10 discount.

> On some older laptops, the reason they're for sale, is the power
> connector broke. Which was why manufacturers started putting the
> power connector on its own PCB. So that if the power connector
> area shattered or cracked, the replacement was a tiny PCB with
> just the connector on it. Your machine could be modern enough,
> that a power connector accident would not be the end of it, and
> if someone broke the power connector, the "main" PCB might be OK
> (since the two bits are separate, to reduce stresses).

On this one, a dead battery and sticky keyboard was probably enough for 
someone to be talked into just getting something new.
Should be here soon and I'll post to A.C.H. the results.

Thanks!

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