Acer Aspire M5-481PT keyboard issue

[p1muserfan]

Have an Aspire with a non-working keyboard. I have 3v at pins 19-26 of CN12 (p. 22) like I believe I'm suppose to. No shorted capacitors at CP1-6 (also p. 22). Power at CN12 is coming from the KBC, correct? Maybe I just need a bios flash? Keyboard itself is new.

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

Have no voltage on U28 (p. 8) at pins 4 (ground), 5, or 6. Problem?

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

Really need a bios dump now, was gonna upload the current file but my programmer can't even id the chip

[ala_borbe]

Re: Acer Aspire M5-481PT keyboard issue

before all do clear cmos, remove batt and dc adaptor

is your laptop operational? can it boot to win? try flashing from windows... what version of bios is currently on it?

by looking at website and reading a little, this laptop is a little tricky, it has 3 versions v1.15 should be used on win7, v2.16 and v2.22 came with same laptop with preloaded win8

maybe wrong verion is flashed, so thats why kbd is not working

anyway, do not flash bios if you cannot id chip, probably you wont be able to flash properly, and always make backup of your current rom, it can save you a lot of troubles

check your cables and connectors, maybe that why you dont get id :/

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

before all do clear cmos, remove batt and dc adaptor

is your laptop operational? can it boot to win? try flashing from windows... what version of bios is currently on it?

by looking at website and reading a little, this laptop is a little tricky, it has 3 versions v1.15 should be used on win7, v2.16 and v2.22 came with same laptop with preloaded win8

maybe wrong verion is flashed, so thats why kbd is not working

anyway, do not flash bios if you cannot id chip, probably you wont be able to flash properly, and always make backup of your current rom, it can save you a lot of troubles

check your cables and connectors, maybe that why you dont get id :/

Removed the cmos battery for a few minutes and now unit won't start at all. When laptop was operational, I would get Acer splash screen and then the message "no boot device detected, press any key to continue". Of course no key I pressed would get me any further so
I thought I had a keyboard issue. Tried external usb keyboard to get into bios, F2 didn't work. So now I don't know if there was a keyboard issue or I just didn't input the correct button combo to get into the bios.
When I removed the bios chip to upload the current file on the chip my programmer couldn't identify it. I've got the same chip I can take from another board but how do I get this thing to fire up again?

[dj_ricoh]

Re: Acer Aspire M5-481PT keyboard issue

what does KBC stand for?

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

what does KBC stand for?

Not sure but same as EC

[ala_borbe]

Re: Acer Aspire M5-481PT keyboard issue

kbc=ec
kbd = keyboard

southbridge controls both usb and sata... maybe problem is there
and it could also make laptop not boot


sorry for bad english

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

Removed cmos to check voltage of it (was only 2.5v, got a new one coming), reinstalled, and now board won't start. Can low voltage on cmos cause this?

[Th3_uN1Qu3]

Re: Acer Aspire M5-481PT keyboard issue

Sometimes yes. But all boards should power up ok without CMOS battery installed.

[p1muserfan]

Re: Acer Aspire M5-481PT keyboard issue

But all boards should power up ok without CMOS battery installed.

That's what I thought but removing and reinstalling the battery is the only thing I did between it starting and then not starting. Guess I'll know for sure when new battery shows up

[ktmmotocross]

Re: Acer Aspire M5-481PT keyboard issue

Sometimes yes. But all boards should power up ok without CMOS battery installed.

yes but when battery is low it cannot start. thats why i first check battery voltage