Acer Aspire one AOD257 netbook black screen

[Herbssat]

Just got one of these in that powers up with a black screen. I am quite sure it is a flaky bios but am not sure of the proper procedure to flash it. I have already tried a few files but no luck with a usb stick. I am afraid that the bios chip may have to be programmed externally. Your help is greatly appreciated.

[alihomee]

Re: Acer Aspire one AOD257 netbook black screen

yas you have to take it out from mobo to program it

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Any recommendations for a cheap usb spi programmer for this winbond soic-8 chip. Have been currently looking at the ent2580 on ebay. Didnt know if i could use this to flash a .fd or a .rom file. Thanks for your help.

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Still looking for recommendations for a usb spi programmer that will reflash soic8 chips.Anybody?

[lezsimply]

Re: Acer Aspire one AOD257 netbook black screen

I recommend this one

http://www.ebay.in/itm/320967107440?...ht_13630wt_937

fast, easy to use and updateable

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Thanks for the quick response. This has become a way of life for these acer netbooks. I am quite sure that some other manufacturers have problems also but not like these acer netbooks. What causes this corruption anyway? Has anybody gotten to the core of the problem or are they just that crappy?

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Received bios chip today from a vendor and now no power up. 3.3 volts not at power switch. Thought about soldering the old chip back on to backtrack. Any ideas on this. 3.3 volts at the bios chip on 4 pins. I hope this vendor programmed this chip for the right netbook.

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Soldered the old chip back in and no dice. 0.685 at power switch and fluctuating. Bios chip has voltage at pins 1,3,7,8.

[thodoris10]

Re: Acer Aspire one AOD257 netbook black screen

Usually the problem is the CPU, did you try reflow?

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Thanks for the response. Trying to see what went south after the new bios chip was installed. It was at least turning on before this. Now nothing and very low voltage at the power switch. Have not tried to reflow anything but im sure that it will still need to be reballed if it works.

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Dont have the schematic for this netbook but looks like pin 94 of the nuvoton Kbc is connected to the power switch directly. Help in this matter is greatly appreciated.

[lezsimply]

Re: Acer Aspire one AOD257 netbook black screen

Is the seller of the chip a legit one? Or perhaps may have good feedbacks? if not then you probably got a defective one.

[atsio]

Re: Acer Aspire one AOD257 netbook black screen

It is actually pin 95. Here is the schematic.

Check pins 64, 93 and 102 on Nuvoton. Also check if you got signals on SPI rails when you plug in adapter and also on LAD rails.

[Herbssat]

Re: Acer Aspire one AOD257 netbook black screen

Thanks for the responses guys. Traced the problem all the way back to the RT8223M(PU3) . Voltage in is not even in the ballpark at 2.6 volts. Will have to see if i have a scrap board to find another regulator. I actually stumbled onto a schematic late last night. Do you think that this bios chip was the cause of this problem or was the regulator failing all along. Without a programmer i could not tell whether the chip was programmed right or not. The seller does have good feedback on ebay.