Which is the eeprom? - Page 1
Forum section: electronics / general

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 07, 2021, 12:14:21 am
content: I need to change the vin in this junk yard radio but I am not sure which is the eeprom. I want expecting to open it up and find 3 8pin chips.

author: MikeK
author_rank: Super Contributor
timestamp: March 07, 2021, 01:00:41 am
content: It's not #2 or #3. I have no idea what #1 is.

author: amyk
author_rank: Super Contributor
timestamp: March 07, 2021, 01:33:10 am
content: I think what you've shown are...Fairchild Si4467DYRohm BA15532Infineon BSP742TNone of those are EEPROM. Keep in mind that EEPROMs are not always in 8-pin packages.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 07, 2021, 02:35:01 am
content: Of course I over looked this one.

author: amyk
author_rank: Super Contributor
timestamp: March 07, 2021, 04:15:32 am
content: That's the one, according to the Internet it will read as either 24c08 or 24c16.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 07, 2021, 07:37:13 pm
content: Thanks, do I just search the chip number to found out if it shows as a eeprom?

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 13, 2021, 01:31:04 am
content: Well I got that one unlock but it won’t work correctly in the vehicle because it original came with a factory navigation. So have a nav unit now and r searching don’t think any of these are the correct one. This is the bottom board unless it’s on the top board. Could somebody verify that none of these are the correct chip. Thanks

author: Nusa
author_rank: Super Contributor
timestamp: March 13, 2021, 02:39:16 am
content: Mystery radio in a mystery car with a looking for an mystery chip for a mystery nav system. Do you think you've told us enough?

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 13, 2021, 03:19:38 am
content: It’s a factory GM navigation radio going in a 2007 chevy suburban

author: amyk
author_rank: Super Contributor
timestamp: March 13, 2021, 03:30:24 am
content: Do you mind doing a bit more searching yourself? Some of those ICs you've posted are very "jellybean" and you'd easily be able to find information that shows they are NOT memory in any way.

author: BrokenYugo
author_rank: Super Contributor
timestamp: March 13, 2021, 04:50:16 am
content: Quote from: Hornnumb2 on March 07, 2021, 07:37:13 pmYup, just Google skills. Sometimes those sketchy datasheet sites are helpful with small parts that may only have partial numbers.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 13, 2021, 04:02:03 pm
content: Thanks yes I did google all those and saw they werent the eprom. Just wanted a second opinion since I dont do this all the time. I think I found it on the top board that I had left at the office. Its a 95640WP.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 13, 2021, 09:42:27 pm
content: Ok which would be pin 1 on here I don’t see a dot on this one and trying to figure it out on data sheet looking at it from writing right side up. I get ground on right bottom pin in circuit. That would put pin 1 at top left. Should I be reading it in as a different chip family not a 2408, 2416? Thanks for any help.

author: DrG
author_rank: Super Contributor
timestamp: March 13, 2021, 10:22:45 pm
content: I have been following this thread and I wish you luck and all, but let me ask you something...When I look at threads like this,https://chevroletforum.com/forum/tahoe-suburban-25/unlocking-nav-after-installation-20590/page3/I see a whole crap-load of "we did this so people would have to come to us to change things and not use junk yards.So, what are you going to use to read and write this. Are the fields documented? Are there protections, check sums all that stuff?

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 14, 2021, 01:32:50 am
content: Using the 866II plus, I have a test clip on it and it says it’s reading it but just shows FF in all spots. So I don’t know if it’s protected or I just need to take it out of circuit. Once I can get some info on the screen I just change the vin number and rewrite.

author: amyk
author_rank: Super Contributor
timestamp: March 14, 2021, 05:33:25 am
content: Check if pin 2 is making contact.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 14, 2021, 09:18:09 pm
content: Thanks again for everybody’s help got it out of circuit and it read fine. Programmed to correct vin and will test it tomorrow when back at lot just trying to learn as I go, I do appreciate all the advice. Michael

author: DrG
author_rank: Super Contributor
timestamp: March 15, 2021, 03:27:53 pm
content: Quote from: Hornnumb2 on March 14, 2021, 09:18:09 pmGood luck and please do let us know what happens. Somehow, I am pessimistic though - I don't know if I read it somewhere or what, but I thought that there would at least be a checksum in there so just changing the vin would not work - I could be wrong and frequently am

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 15, 2021, 05:46:45 pm
content: yep worked great.