Electronics > Repair
Need Help Programing an 93C46 EEPROM. I Can Read and Erase But Not Write.
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DavidAlfa:
What other options are available in the erase button?
Chooch_Fiesta:
I thought maybe I had it wrong based off the PCB circuit being too damaged so just for fun I removed ground from the ORG pin so that it would be in X16 configuration and I can still read the chip with both AsProgrammer and NeoProgrammer, but I cannot erase the chip with NeoProgrammer

There are no other options under erase other than blank check.

I can't tell if I have a hardware or software issue that it is preventing it from writing. I purchased some new 93C46 EEPROMs to see if I am able to write a different one.

CH341A is the only programmer I have.
DavidAlfa:
Try:
https://github.com/McMCCRU/SNANDer

Psi:
If you try to write the same value already at the address does it still fail?
Psi:
If you unsoldered this from a car alarm there is a possibility this IC is not 100% the same as what you think based on markings that say 93C46.

It could be a custom sku of the 93C46, or maybe it has a silicon fault and was sold cheap to specific customers along with documents that provide a work-around.
Perhaps there is a mark on the IC to indicate this but only the manufacturer can tell and to anyone else it looks like a date code.
i.e, It may appear to be a 93C46 but not actually match the datasheet exactly.

Maybe order a new official chip and try that,  assuming the car alarm just reads the chip and it sounds like you can read it that should still work fine.
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