Unable to read ST 95640W EEPROM

• Unable to read ST 95640W EEPROM
  Posted by sidlauskas on 28 Jan, 2021 09:49
• Hello all,
  
  I get bunch of 0xFF when I'm trying to read ST 95640W EEPROM desoldered from the car radio (see the photo). It's some kind of protection?
  
  Programmer - modified CH341A black edition (+5V)
  Software - AsProgrammer v2.1.0.13
  
  I have no problems reading ST 95320W with the same programmer and software.
  
  

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• #1 Reply
  Posted by Terry Bites on 28 Jan, 2021 12:06
• Could you have killed it the heat of de soldering?
  An erased EPROM shows FF in all fields?
• #2 Reply
  Posted by wraper on 28 Jan, 2021 12:08
• If you try reading it as ST 95320W and it still reads FF, then IC is either empty or dead.
• #3 Reply
  Posted by sidlauskas on 28 Jan, 2021 12:29
• Quote from: wraper on 28 Jan, 2021 12:08

  If you try reading it as ST 95320W and it still reads FF, then IC is either empty or dead.
  

  
  Could it be that the EEPROM is empty by design until the radio is coded?
• #4 Reply
  Posted by wraper on 28 Jan, 2021 17:09
• We don't know what's the radio, if it was ever used, what is stored in this EEPROM and why you want to read it to begin with. This EEPROM cannot have any read protection BTW.
• #5 Reply
  Posted by sidlauskas on 28 Jan, 2021 19:16
• You're all right. It seems the chip is dead. Probably due to desoldering. Thank you for the help!