MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 Trying to write TMS2532JL but 25v missing		  New Topic  Reply to Topic
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RetroByte

United Kingdom
2 Posts
Posted - 09/08/2023 :  07:46:00  Show Profile  Reply with Quote
Hello all, I’ve just purchased a GQ-4X4 to burn some TMS2532JL but they aren't getting written.

I'm only getting just over 23v on the VPP, but the datasheet for these chips says VPP should be 25v.

It goes through the write process but fails verifying.

I’ve added a 9v 2A external power supply and have also tried a powered USB hub.

I’ve run the power test, which says 25v is OK.

I've checked the devices.txt and it's set to 25v.
Edited by - RetroByte on 09/09/2023 04:08:51
Reply #1

RetroByte

United Kingdom
2 Posts
Posted - 09/09/2023 :  10:10:36  Show Profile  Reply with Quote
I'm thinking they might just be bad chips
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Reply #2

anniel

2540 Posts
Posted - 09/10/2023 :  05:10:43  Show Profile  Reply with Quote
quote:
Originally posted by RetroByte

I'm thinking they might just be bad chips

Bad chips can pull the voltage down. Where does the chips come from?
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Reply #3

Ronen 722

United Kingdom
6 Posts
Posted - 09/25/2023 :  05:29:55  Show Profile  Reply with Quote
thanks for the reply, I havwe been reading the wrong chips - correct ones now Identified.
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Reply #4

anniel

2540 Posts
Posted - 09/26/2023 :  07:20:39  Show Profile  Reply with Quote
quote:
Originally posted by Ronen 722

thanks for the reply, I havwe been reading the wrong chips - correct ones now Identified.


Excellent.
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