MCUmall EPROM BIOS Chip Burner Forum
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 Problems erasing at29c040a with GQ-4X		  New Topic  Reply to Topic
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jero32

Netherlands
3 Posts
Posted - 06/07/2009 :  07:16:01  Show Profile  Reply with Quote
I recently got a GQ-4X and as a matter of trying it out. I got out an old flash chip I pulled of a motherboard. Now I seem to be able to read it. (In fact I seem to have a found a joke in the code ;-) ) However I can't seem to erase it! Now I connected a dc adaptor and everything..but it just wont erase it. Any tips?

edit: forgot to mention. I also already tried filling the buffer with FF and then writing that. But that didn't work either.

edit2: tried another chip (not the same type) and it DID erase it. So it's probably not the programmer.
Edited by - jero32 on 06/07/2009 07:34:20
Reply #1

ZLM

2945 Posts
Posted - 06/07/2009 :  09:32:24  Show Profile  Reply with Quote
will check on this.
What is your chip package? DIP or TSOP?
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Reply #2

jero32

Netherlands
3 Posts
Posted - 06/07/2009 :  09:58:53  Show Profile  Reply with Quote
It's a dip package. Of course there's the possibility the chip is busted. But stil nice of you for checking :-)
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Reply #3

ZLM

2945 Posts
Posted - 06/07/2009 :  17:40:35  Show Profile  Reply with Quote
Your chip seems been locked out. If your chip been bott sector locked out, then there is no way to erase chip.

see:

Image Insert:

60.03 KB
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Reply #4

jero32

Netherlands
3 Posts
Posted - 06/07/2009 :  21:30:58  Show Profile  Reply with Quote
OK that makes sense then :-) Wil have to get another chip.
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