So I bought this on Ebay: https://www.ebay.com/itm/Bogey-Mano...UYtD1S4g6c%3D&orig_cvip=true&nordt=true&rt=nc
it didn't go for much even though it was a rare pcb...
Then I got the board....
The ENTIRE board was corroded and I mean the ENTIRE board...every single chip was corroded, every single socket was corroded, every single rom was corroded and most bypass capacitors were cracked as well as the nasty electrolytic caps . All of the sockets needed to be replaced, all of the roms needed to be replaced, and honestly 90% of the 74x chips and all of the ram needed to be replaced...it was that bad. Now, even though this was the case..I refused to give up. The interesting thing was, even tho the chips were completely fucked...the board itself was fine...just oxidized. So I started socketing all of the major chips and replacing the current sockets (including the VSC30, DSC10, roms, sound chips, hmc20, 6502, proms). Socketing that DSC10 PGA was fun, but it had to be done because many of the other chips were completely screwed up and I wanted to make sure this wasn't.
https://www.dropbox.com/s/gxj7kskvcraknhr/Photo Oct 20, 2 42 02 PM.jpg?raw=1
I started it up and got jack squat...So I was looking at the main crystal and it was giving off the proper 12 mhz, but none of the other major chips (cpu, sound, etc) were getting a clock. So I traced where the 12 Mhz clock was going and it was going into the HMC20 Deco custom. From what I saw/understood this chip took the 12 mhz clock and gave the clocks to all of the other chips...which it wasn't doing. Ordered a replacement, socketed it and I was finally giving the proper clocks to the other chips!
https://www.dropbox.com/s/zb4org88v5gs3zn/Photo Oct 30, 8 50 00 PM (1).jpg?raw=1
Booted it up, and it worked! Sorta..there were odd sprite problems. It was almost like something was covering the sprites....I feared the DSC10 was bad (which handles sprites)....
Also another thing that puzzled me was the game was upside down and there was no way to fix this, not even a dipswitch. Then I found out it was supposed to be like this. However! By accident I found a way to fix this:
https://www.dropbox.com/s/ct4m15b3j6b17lp/Photo Oct 30, 8 50 13 PM.jpg?raw=1
This LS174 takes the original image and flips it for whatever reason, so I just lifted the input leg (pin 6) and now it's in the correct position!
Moving back to the DSC10, I received another one in the mail and it did the exact same thing... so knowing I have socketed everything else related to that on the board, I knew it was going to be something stupid. I went to my friend's house who has a good microscope and he found a few tiny broken traces on a few eyelets (caused by the corrosion) on the LS chip at F4. Patching that up we get:
It works all the way!!
https://www.dropbox.com/s/bwp20boa4ku7pvd/Photo Oct 30, 8 50 27 PM.jpg?raw=1
In the end...I replaced every chip on the board except the VSC30, DSC10, the CPU, 4 74 chips, the 2 proms and that's about it. I replaced all of the by pass caps with quality ceramic ones and all of the caps in the sound section as well.
HAPPY HALLOWEEN!!!!
it didn't go for much even though it was a rare pcb...
Then I got the board....
The ENTIRE board was corroded and I mean the ENTIRE board...every single chip was corroded, every single socket was corroded, every single rom was corroded and most bypass capacitors were cracked as well as the nasty electrolytic caps . All of the sockets needed to be replaced, all of the roms needed to be replaced, and honestly 90% of the 74x chips and all of the ram needed to be replaced...it was that bad. Now, even though this was the case..I refused to give up. The interesting thing was, even tho the chips were completely fucked...the board itself was fine...just oxidized. So I started socketing all of the major chips and replacing the current sockets (including the VSC30, DSC10, roms, sound chips, hmc20, 6502, proms). Socketing that DSC10 PGA was fun, but it had to be done because many of the other chips were completely screwed up and I wanted to make sure this wasn't.
https://www.dropbox.com/s/gxj7kskvcraknhr/Photo Oct 20, 2 42 02 PM.jpg?raw=1
I started it up and got jack squat...So I was looking at the main crystal and it was giving off the proper 12 mhz, but none of the other major chips (cpu, sound, etc) were getting a clock. So I traced where the 12 Mhz clock was going and it was going into the HMC20 Deco custom. From what I saw/understood this chip took the 12 mhz clock and gave the clocks to all of the other chips...which it wasn't doing. Ordered a replacement, socketed it and I was finally giving the proper clocks to the other chips!
https://www.dropbox.com/s/zb4org88v5gs3zn/Photo Oct 30, 8 50 00 PM (1).jpg?raw=1
Booted it up, and it worked! Sorta..there were odd sprite problems. It was almost like something was covering the sprites....I feared the DSC10 was bad (which handles sprites)....
Also another thing that puzzled me was the game was upside down and there was no way to fix this, not even a dipswitch. Then I found out it was supposed to be like this. However! By accident I found a way to fix this:
https://www.dropbox.com/s/ct4m15b3j6b17lp/Photo Oct 30, 8 50 13 PM.jpg?raw=1
This LS174 takes the original image and flips it for whatever reason, so I just lifted the input leg (pin 6) and now it's in the correct position!
Moving back to the DSC10, I received another one in the mail and it did the exact same thing... so knowing I have socketed everything else related to that on the board, I knew it was going to be something stupid. I went to my friend's house who has a good microscope and he found a few tiny broken traces on a few eyelets (caused by the corrosion) on the LS chip at F4. Patching that up we get:
It works all the way!!
https://www.dropbox.com/s/bwp20boa4ku7pvd/Photo Oct 30, 8 50 27 PM.jpg?raw=1
In the end...I replaced every chip on the board except the VSC30, DSC10, the CPU, 4 74 chips, the 2 proms and that's about it. I replaced all of the by pass caps with quality ceramic ones and all of the caps in the sound section as well.
HAPPY HALLOWEEN!!!!
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