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Mark



Joined: 30 Mar 2010
Posts: 24


PostPosted: Sun Jun 30, 2019 2:44    Post subject: NAND reading with 00 00 00 00 ID
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Hi Everyone,

I have a NAND that is reading with 00 00 00 00 ID, although I was able to get FER to
see the ID once as 98 D7 98 82 and read it but there were errors.

I wanted to try retries but the chip read 00 ID and I have never been able to get the correct ID again.

The NAND is marked with HVNF4F5 and is a TSOP, page of 9216 and read with WL v2.

The chip works as I have verified the ID with other devices I have but none of them read the chip correctly, only FER has.

I tried the various commands in debug but none work at the moment.

Does anyone have any ideas on how to get FER to read the ID correctly.

Any help would be much appreciated.

Thanks
Сергей



Joined: 26 Aug 2005
Posts: 17847

Flash-Extractor developer

PostPosted: Sun Jun 30, 2019 3:08    Post subject:
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FER = Flash Extractor Reader?

If there is no ID, in 90% cases problem is bad connection

Also can try:

1. change Config / Bus from 8 to 16
2. Read ID on 1.8v, 2.4v
3. Add power mod

If you already see ID once, then (1) not need

Also can be bad connection between adapter and reader
HaQue



Joined: 16 Feb 2013
Posts: 456
Location: Adelaide, Australia

PostPosted: Sun Jun 30, 2019 4:42    Post subject:
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I had situation like this.

I did the following and got 100% ID each time after, though I am not sure which part actually fixed it:

1: took tsop adapter off and cleaned contacts of both adapter and reader with rubbing alcohol and cotton tip

2. cleaned inside tsop adapter with cotton tip

3. under microscope, cleaned pins of chip with hobby knife. there was some crap in between some pins right near the package material.

4. changed USB cable

But I have also had some chips that do this that never worked, I think internal wire bond broken.
Mark



Joined: 30 Mar 2010
Posts: 24


PostPosted: Sun Jun 30, 2019 7:57    Post subject:
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Thanks,

Yes FER means Flash Extractor Reader.

I tried the power change and the cleaning but nothing worked and chip does still ID correctly in other readers.
Сергей



Joined: 26 Aug 2005
Posts: 17847

Flash-Extractor developer

PostPosted: Sun Jun 30, 2019 10:48    Post subject:
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Check female screws size

Thin screws between adapter and reader
Fat screws from bottom of reader

Other chips read ID ok?
arvika



Joined: 18 Nov 2009
Posts: 1773
Location: Poland

PostPosted: Sun Jun 30, 2019 11:36    Post subject:
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FE reader have quite wide TSOP48 adapter, and some chip are not fit well. Because bad contact it could not give good ID
Сергей



Joined: 26 Aug 2005
Posts: 17847

Flash-Extractor developer

PostPosted: Sun Jun 30, 2019 13:58    Post subject:
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arvika wrote:
FE reader have quite wide TSOP48 adapter, and some chip are not fit well. Because bad contact it could not give good ID

Shocked

This is impossible )
HaQue



Joined: 16 Feb 2013
Posts: 456
Location: Adelaide, Australia

PostPosted: Sun Jun 30, 2019 15:47    Post subject:
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I think Arvika means that the chips can move a little left or right in adapter and not fit real tight.

or some chips are manufactured a tiny bit small, or have crappy packagel.

That's why I always just look under microscope that adapter pins are clamping properly on the chip leg, and if not, press the spring top down on the side I am looking at and move it so directly in the middle. It really very easy, works well.

But most times no problem
arvika



Joined: 18 Nov 2009
Posts: 1773
Location: Poland

PostPosted: Sun Jun 30, 2019 16:33    Post subject:
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Some refurbished chips with poor quality, could have little smaller package and not fit well. It is quite rare situation.
Mark



Joined: 30 Mar 2010
Posts: 24


PostPosted: Mon Jul 01, 2019 3:12    Post subject:
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It's not a physical problem with the reader or the chip, other chips work fine and the chip IDs ok in other readers.

I did manage to get the chip to ID in Flash Reader but I have to power the chip up a split second after I pressed the ID button on the Reader but if I pressed the ID button again it would ID as 0.

I also was able to read the chip using the same procedure, ie:
- Chip power off.
- Press Read on the reader, wait about half a second
- Power up the chip, read worked.
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