Help! Identifying this board

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Help! Identifying this board

Postby mlop5432 » Sat Oct 10, 2015 11:47 am

This is a laptop motherboard, I'm trying to fix it and some schematics would be great

The laptop is a Medion Akoya P6648, it doesn't turn on at all so I can't get any BIOS id string.

I dissasembled the thing and I think this text that I found on the board
should identify it but I haven't found any schematics:

HannStar J
MV-4 E89382
94V-0

C15B Main Board
REV: 2.0

Image

Any ideas?

thanks!
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Re: Help! Identifying this board

Postby Karlsweldt » Sat Oct 10, 2015 2:50 pm

Welcome to Motherboards.org.
Have you done a search for that " HannStar J MV-4 E89382" ? Several links come up, including these..
http://notebookschematic.com/?s=+E89382
http://www.hannstar.com/
May not be the exact model, but may help.
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Re: Help! Identifying this board

Postby evasive » Mon Oct 12, 2015 8:56 am

Hannstar made the board which they then shipped to Pegatron (formerly Asus OEM factory). Have not found schematics yet.
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Re: Help! Identifying this board

Postby Karlsweldt » Mon Oct 12, 2015 3:24 pm

Noted this in your original post..
..Medion Akoya P6648, it doesn't turn on at all..

When was the last time the BIOS battery was changed? Most laptops have three, one being the main power battery. But there also is a 'sleep' battery that keeps the OS in memory when not active. That battery may be a rechargeable type, not needing replacement. But the BIOS battery is good for about 3~4 years, depending on use.
The real-time clock may stop if the BIOS battery is dead. And many systems won't show life signs if the real-time clock is DOA.
Also, how was the laptop shut down from its last use? If left in 'sleep' or 'hibernation' mode too long, it could have shut down or lost its restart cache. Check the owner's manual on reset of those modes.
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Re: Help! Identifying this board

Postby mlop5432 » Tue Oct 13, 2015 4:58 am

The laptop suddently and abruptly shut down while watching a video file.

It doesn't even turn on any LED's when plugged in, so I doubt it's something as 'high level' as the BIOS.

I have since my last post tested the motherboard while plugged in, and there are no 3.3v or 5v to be found anywhere.

At the moment my suspicions lie on the charging control circuits and the mosfets nearby, still, it would be great
to have a proper schematic or layout to know what I'm doing :P
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Re: Help! Identifying this board

Postby Karlsweldt » Tue Oct 13, 2015 3:15 pm

The laptop suddenly and abruptly shut down while watching a video file.

That indicates a possible overheat problem for the CPU (or GPU if separate).
The CPU has thermal limiters in the die, to throttle back when it gets too warm.. or shut down totally.
If the heat sink and cooling system was not up to par, then a possible cause.
Should be some small square (about 1/2") chips with leads near the CPU. The logo on them should be a white or silver color. If any look "toasted", that could be a cause.
Have noted some replacement E89382 motherboards listed from a search. Maybe eBay?
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Re: Help! Identifying this board

Postby mlop5432 » Wed Oct 14, 2015 3:13 am

Karlsweldt wrote:Have noted some replacement E89382 motherboards listed from a search. Maybe eBay?


I've tried, but googling or searching in ebay for E89382 yields a wide variety of boards and motherboards.
Adding 'medion' to my search yields nothing interesting.. :/
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Re: Help! Identifying this board

Postby evasive » Mon Oct 19, 2015 12:53 pm

It is a Pegatron C15B board, used in OEM systems such as this Medion Akoya. I'll see if I can find anything useful, sometimes complete schematics show up all of a sudden. You may be lucky.
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