Del Griffith
Active member
Bought this dead Hyper Sports pcb off ebay a while back. The pcb was in excellent condition and better than my worker, I thought maybe something easy...... ha ha big mistake! I don't really log any of my repairs because i don't have the technical knowledge or skills to know what i'm talking about so most repairs are fluke or belt an brace jobs for now. I think this board deserves a mention tho. I don't have any pictures for the 1st stage as i didn't think it was going to be a major.
First i wanted to see which of the 2 boards were faulty using my worker and so after some swapping around i found both boards were faulty. Hmm i decided to start the bottom board first which was dead with a black screen and loud buzzing noise. I read all the roms and they all checked out ok, Cleaned all socketed custom chips and tried again with my working top board...... no change, Next i started poking around with the logic probe and found tons of floating pins on some of the Fujitsu chips. I've heard about them being likely candidates on bad boards and a good place to start so before trying to look over the horrible and virtually unreadable schematics for this game i started piggybacking some new chips over the ones with floating pins..... what do ya know one by one they started pulsing again, Found a total of 14 chips 12 fuji's and 2 toshiba 2114 ram chips now all piggybacked and pulsing away.
This was the result
Board is booting and running partially with garbled graphics.
Thought at this point i better start replacing and socketing some of the suspected faulty chips and see if they really are all faulty. I'd say at this point you have to ask yourself how much do i like this game 14 chips an all!!! In my case alot as i love hyper sports. Taking it slowly to not damage the tracks or board i replaced them one at a time checking the results after each one......
All 14 replaced and board is running as pictured above. Time for a few days off it.
After a few days away from this board i came back turned it on and the colours were gone and game even more garbled!!! Stressed with it at that point i didn't take a picture of the fault but another failure somewhere was certainly making things even worse. I poked around again trying to read the schematics and piggybacking any chip that seamed to be acting oddly but no change at all, I was starting to lose faith with it a little, Thankfully a chance visit from the one and only Mitchell Gant armed with his scope got me back on track. Neil managed to locate a shady Fuji LS245 at location E9 which was causing the most recent problems (piggybacking this chip made no difference so i learned a good lesson there not to depend on that technique) Right excellent and back to running like the pictures above.
Here's how the board is looking so far
came back to the board 2 days later and this
Aaaahhhhhh another failure without touching anything.... no sprites anymore and less backgrounds!!!
Thinking now if these chips are failing at this rate and all apart from ram have been Fuji's i might as well just swap them all out sein as i've come this far. I don't plan on getting rid of this board so the cost is not important plus the small ttl chips are cheap anyway.
Started swapping two at a time then checking the results,
H11 - LS244 & F12 - LS32 and this happened
A few more with no change and then i swapped an LS245 at H1 and this
Much better, Just faded sprites and a slight wobble on the screen but really getting somewhere now.
Carried on swapping til all were done but this is as good as it was getting just swapping out the Fujitsu ic's so what next?? Everything seemed to be working fine when going round the board as far as i could tell. Read through a few repair logs of this game and decided to change the 2 toshiba 2114 rams i had not already done in the block of four at locations H8 and H9, Again piggybacking these made no change where as the two next to them did make a change earlier on in the repair so i left these 2 thinking they were fine, This was the result....
Working Perfect!!! The couple of glitches on the score is just because their's no battery in the top board.
Here's how the board looks (socket city!!!)
Roughly 40ish chips in the end, Not all faulty but how long would the rest have lasted after some play??? prob not long judging by all the other faulty ones.
Once i've fixed the top board i'll post an update on this thread, That's if i can get it sorted
Del Griffith2013-09-04 23:20:59
First i wanted to see which of the 2 boards were faulty using my worker and so after some swapping around i found both boards were faulty. Hmm i decided to start the bottom board first which was dead with a black screen and loud buzzing noise. I read all the roms and they all checked out ok, Cleaned all socketed custom chips and tried again with my working top board...... no change, Next i started poking around with the logic probe and found tons of floating pins on some of the Fujitsu chips. I've heard about them being likely candidates on bad boards and a good place to start so before trying to look over the horrible and virtually unreadable schematics for this game i started piggybacking some new chips over the ones with floating pins..... what do ya know one by one they started pulsing again, Found a total of 14 chips 12 fuji's and 2 toshiba 2114 ram chips now all piggybacked and pulsing away.
This was the result
Board is booting and running partially with garbled graphics.
Thought at this point i better start replacing and socketing some of the suspected faulty chips and see if they really are all faulty. I'd say at this point you have to ask yourself how much do i like this game 14 chips an all!!! In my case alot as i love hyper sports. Taking it slowly to not damage the tracks or board i replaced them one at a time checking the results after each one......
All 14 replaced and board is running as pictured above. Time for a few days off it.
After a few days away from this board i came back turned it on and the colours were gone and game even more garbled!!! Stressed with it at that point i didn't take a picture of the fault but another failure somewhere was certainly making things even worse. I poked around again trying to read the schematics and piggybacking any chip that seamed to be acting oddly but no change at all, I was starting to lose faith with it a little, Thankfully a chance visit from the one and only Mitchell Gant armed with his scope got me back on track. Neil managed to locate a shady Fuji LS245 at location E9 which was causing the most recent problems (piggybacking this chip made no difference so i learned a good lesson there not to depend on that technique) Right excellent and back to running like the pictures above.
Here's how the board is looking so far
came back to the board 2 days later and this
Aaaahhhhhh another failure without touching anything.... no sprites anymore and less backgrounds!!!
Thinking now if these chips are failing at this rate and all apart from ram have been Fuji's i might as well just swap them all out sein as i've come this far. I don't plan on getting rid of this board so the cost is not important plus the small ttl chips are cheap anyway.
Started swapping two at a time then checking the results,
H11 - LS244 & F12 - LS32 and this happened
A few more with no change and then i swapped an LS245 at H1 and this
Much better, Just faded sprites and a slight wobble on the screen but really getting somewhere now.
Carried on swapping til all were done but this is as good as it was getting just swapping out the Fujitsu ic's so what next?? Everything seemed to be working fine when going round the board as far as i could tell. Read through a few repair logs of this game and decided to change the 2 toshiba 2114 rams i had not already done in the block of four at locations H8 and H9, Again piggybacking these made no change where as the two next to them did make a change earlier on in the repair so i left these 2 thinking they were fine, This was the result....
Working Perfect!!! The couple of glitches on the score is just because their's no battery in the top board.
Here's how the board looks (socket city!!!)
Roughly 40ish chips in the end, Not all faulty but how long would the rest have lasted after some play??? prob not long judging by all the other faulty ones.
Once i've fixed the top board i'll post an update on this thread, That's if i can get it sorted
Del Griffith2013-09-04 23:20:59
