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A1502 (820-3476-A) Can not read 25Q064A
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tunsie [ 18 авг 2016, 17:44 ]
Заголовок сообщения:  A1502 (820-3476-A) Can not read 25Q064A

Hi,

I've a problem with reading the chip 25Q064A i use tl866cs and ezp2010 both off them doesn't recognize it some help will be appreciated

MacBook Pro A1502 820-3476-A 25Q064A

simpleboy123 [ 18 авг 2016, 18:14 ]
Заголовок сообщения:  Re: A1502 (820-3476-A) Can not read 25Q064A

try 25L6406E or ST Brand or Micron brand
above 1 of 3 will work hopefully
and your ic brand is Numonyx also search for it your programmer.

tunsie [ 18 авг 2016, 18:45 ]
Заголовок сообщения:  Re: A1502 (820-3476-A) Can not read 25Q064A

unfortunately without success

simpleboy123 [ 19 авг 2016, 18:39 ]
Заголовок сообщения:  Re: A1502 (820-3476-A) Can not read 25Q064A

then problem is mainly with your ic
change your ic.bios file is availible on this site
is this simple?

tunsie [ 20 авг 2016, 13:08 ]
Заголовок сообщения:  Re: A1502 (820-3476-A) Can not read 25Q064A

I tried a few dumps system starts very slow. But yesterday i solved the problem i shorten the cables to 1 inch after then i was able to read and write

Shooter75 [ 13 окт 2016, 11:48 ]
Заголовок сообщения:  Re: A1502 (820-3476-A) Can not read 25Q064A

Problem is in 1,8Vcc at "Q" series chips.

I modified my 5VDC SOIC8 ZIF adapter.
1. I cutted VCC line from ZIF to DIP.
2. Added in line two diodes in sequence, it make voltage drop approximative 1.4V 5-1,4 = 3,6v
3. Added a jumper between ZIF Vcc and DIP Vcc pins. It restores 5Vcc in other cases.
4. And then I added another line of two diodes in cutted Vcc line and added one more jumper.
3,6V-1,4V=2,2V This is enough to operate with "Q" series SPI FLASH ROMs.

In total I made power bus in this mode:

[2,2VDC] ZIF-Vcc-|<|-|<|-.[3.6VDC].-|<|-|<|-DIP-Vcc [5VDC]

And all works excellent!

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