Super Offroad with Track Pack

Nexus13

Member
Joined
Nov 5, 2013
Messages
166
Reaction score
6
Location
Edmonton, Alberta, Canada
Hi all,

I have an offroad board I'm dealing with I'm hoping someone can point me in the right direction. This board originally wasn't booting at all. I went through the entire board with a fine tooth comb and found all kinds of mess ups. I found small bits of copper wire all over the board, and also found one chip U21 to have a bent chip leg and wasn't seated properly into the socket.

QI67FoHl.jpg


After re-seating every chip and cleaning all the sockets i've now got the game booting however there still seems to be an issue with the vertical positioning of the gametrack (not the cars).

Here's what I mean:
5faZX2Ll.jpg


I've gone through the service switch diagnostics and everything shows good. I just wanted to confirm my next steps. I've checked out the schematics and there is one section called "Background Vertical Address". Can anyone confirm if this would be a good place to start checking chips?

Thanks in advance!
 
Yeah, I believe some were done that way to make a selectable word size EEPROM (like 93C46C) equivalent to the fixed 16-bit word size EEPROM (like 93C46B).

DogP
 
Hey DogP,

So I've confirmed the repair using my other offroad track pack U120 chip. Your fix 100% works! Thanks again for leaving such a detailed resolution to the problem.

For the actual reprogramming of the replacement chip, I just wanted to confirm:

1.) Dump the working U120 from my working Track pack board
2.) Flash this dump onto the chip in the link below

https://www.digikey.ca/product-detail/en/microchip-technology/93C46B-I-P/93C46B-I-P-ND/254227

Just want to confirm I don't have to install any resistors on the replacement 93C46B.

Kind regards,
 
Great to hear!

You actually don't need to dump or write U120 at all... if you just install a blank EEPROM, the board will take care of initializing it and everything (unless you want to transfer stats or something from your other board... not sure how much is stored in the EEPROM vs. the battery backed memory anyway though).

And correct, the 93C46B doesn't need any resistors.

DogP
 
Back
Top Bottom