Megatouch EVO motherboard problems (p61wp-fe)

pun84

New member
Joined
Oct 9, 2009
Messages
129
Reaction score
1
Location
New Jersey
Hey, I got this bad mega-touch mobo that won't boot up. Usually i'll change the bad caps out and the board will start working just fine.. However on this board it doesn't seem to work.

The motherboard will power but the cpu/bios wont do the normal chirp/beep sound. I ended up changing all the caps on the board and still no luck. :(

I noticed that the 128pin BIOS chip (IT8712F) is getting VERY hot while the board is powered on...

Anyone ever experience this?

Should I just toss the mobo ? :(


thanks!
 
Per the Datasheet (http://www.datasheetcatalog.org/datasheets/1150/495234_DS.pdf) the ITE IT8712F is a LPC (Low Pin Count) IO Device. In the Laptop PC world, this thing is used ALL THE TIME as a SuperIO. Granted, I'm talking about the 3.3v version, but the method is the same.

ITE stuff at my job is typically referred to as "It's The End." Dumb joke, but appropriate. Damn things.

If it's getting hot, check the VCC Feed (Page 9 of the Datasheet) on pin 4, 35, or 99. The thing probably blew up inside and is now sinking a ton of current to ground.

Got parts? If so, replace it (if you have the tools/skills to replace a 128pin QFP). Otherwise.. Well, there's always replacing the board, I guess. :(
 
Haha, its the end.. I like that :)

Hmm, I probably could change it out.. I do have a basic rework station, with the hot air blower. I don't have a spare though :/

Wouldn't that chip also need to be re-programmed?
 
Last edited:
They are non-programmable devices. (Ok; It has 2kb of ROM for the Keyboard Controller. I highly doubt a Megatouch is using that. Way overkill.)

The device itself pulls the BIOS ROM at boot time over the LPC interface. Assuming they are using the device this way (not familiar with Megatouch boards.)

Just be careful if you're going to attempt it yourself. Fine pitch QFP's can be a huge pain in the arse.
 
Ah, very cool!

Thanks for taking the time to help me out. I will try swapping it out, found one on ebay for $14.00 shipped.. not too bad i guess :]
 
Thought I would update thread, VCC on all the power pins still reads 5.14V and still heating, definitely going to get the replacement component and try it out.
 
It worked!

Update #2:

Changing the ITE chip worked!!

Soldering the chip was a bit tricky, and didn't work at first, but once I made sure none of the pins were lose it worked like a charm. :)

Thanks again for the advice WinDrake
 
Back
Top Bottom