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krzysiobal
Posts: 764
Joined: Sun Jun 12, 2011 12:06 pm
Location: Poland

test

Post by krzysiobal » Wed Jul 18, 2018 10:27 am

Some of my `fixes` are really crazy (probably no one would even want to waste time for that), for example:
* Fixing broken (blob) CHR-ROM memory:
Image
* Fixing broken (blob) mapper chip (MMC1):
Image
* Fixing broken (blob) CHR-RAM:
Image
* Fixing broken PAL chip -> replacing with Xilinx CPLD (version 1)
Image
* Same but with Altera CPLD:
Image
* This one consisted of 2x 8 MBit memory, which had single data bus pins broken -> instead of replacing them, I just installed one memory that fixed data for the broken pins:
Image
* Broken ASIC BF9096 in Codemaster cart -> fix with CPLD:
Image
* MMC3 chip had broken IRQ line -> I had to implement this on cpld:
Image
*JY-120 (45 in 1): Some upper PRG/CHR lines of glob-mapper were broken but also reading PRG-ROM returns non consistent results
Image
*Wario Land: CHR-ROM was broken, but instead of soldering 32 wires, soldered add-on board:
Image
*Dragon Ball: Mapper chip was broken, but I was curious how to read PRG/CHR roms, so I soldered add-on board with latch:
Image

Some more ROM fixes:
Image
Image Image

huuanhuynh
Posts: 2
Joined: Tue Mar 05, 2019 7:23 pm

Re: test

Post by huuanhuynh » Wed May 27, 2020 8:36 pm

Please!
How to disable broken blob?
https://obrazki.elektroda.pl/4281527100_1513255384.jpg
Can I use HY62256ALP-7 for replace?

dink
Posts: 53
Joined: Sun Jan 12, 2020 8:42 pm

Re: test

Post by dink » Thu May 28, 2020 5:51 am

Thanks for sharing, I love pcb pics, especially borg-pcb pics :)
Just a curiosity, did those chips/blobs fail with normal use, or did someone insert them backwards or something like that?


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TmEE
Posts: 761
Joined: Wed Feb 13, 2008 9:10 am
Location: Estonia, Rapla city (50 and 60Hz compatible :P)
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Re: test

Post by TmEE » Fri May 29, 2020 10:05 pm

These are awesome repairs ~

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Fisher
Posts: 1109
Joined: Sat Jul 04, 2015 9:58 am
Location: -29.794229 -55.795374

Re: test

Post by Fisher » Sat May 30, 2020 3:47 pm

That's awesome!
Congratulations!!

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