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Virtua Striker 2(Model 3)Repair

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VS2 Junkie View Drop Down
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    Posted: 14 Oct 2019 at 9:13pm
Just after fixing Daytona U.S.A. my Virtua Striker 2 v98 decided to pack up Cry.

I was faced with 2 faults.

1. the polygons where all screwed up.






2. the ram backup was bad.







Note the game always has 99 credits(even after resetting the game from the test menu)




Going into test mode the machine showed the faults.









and the videoboard










So the first job was to fix the CPU board.


First i changed the 2 static ram chips.









Easy right !!!!!!

Well no Sleepy

when i fitted the board back in the machine i still had a test fail of IC21-IC22 so i had to dig a bit deeper.

Next i replaced the supercap and the coincell.





after replacing i tested again and still no joy on the ram chip fault.Angry


I checked the select lines with a scope on bootup and all seemed fine except the Pin 20(CS1) which is partly tied to the ram battery controller (MB3780A).
So metering from pin 9(reset) of the MB3780A to pin 20 of the static rams i found that they where open circuit.
As can be seen in the pics there is corrosion around the last empty slot for a static ram IC and i think this has been caused by a fan in the model 3 cabinet that sits directly below the CPU cage blowing damp air at the cage itself.I rectified this by turning the fan round to draw air away from the cage but still giving airflow.


PCB faulty track.





Fan mod.





Next i used a USB microscope to find the exact location of the fault.




 

Below is the microscope view of the red square.







Next is the track repair.





On putting the board back in the machine i got......





That's one of the two faults done.WinkWinkWinkWinkWink


The next part was to replace IC83 & ICIC84 on the videoboard.





and cleaned up.





And yes i did get that small spot of solder off IC83Big smileBig smile




Replacement chips done.






CPU back in.






All done and working 100%.ClapClap













As my username will tell you this is my addiction and i also have it on the dreamcast.Tongue
This game has to be working at all costs Smile


I have another model3 CPU card and videoboard to have a go at in the future.




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bones View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bones Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2019 at 11:58pm
   Excellent fix,well explained,cheers
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Kev A View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kev A Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2019 at 9:22am
Thanks for posting dude, always good to see repair logs for model 3 stuff as information is so scarce, your soldering looks super neat
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Post Options Post Options   Thanks (0) Thanks(0)   Quote channel27 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2019 at 11:12am
Outstanding work Thumbs Up
Wanted
Tekken: 3, 5DR, 5.1, 6, 6BR, TTT2
Virtua Fighter: 2.1, 3TB, 4, 5
Any working / faulty Sega Model 1/2/3 boards
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steling1 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2019 at 11:52am
oh wow this is very nice...I have got a bunch of glitchy (to various degrees) model 3 video boards, I have always thought they where mostly beyond repair and that is prob true for some of them but this gives some hope,

I should have another look at them & retest them, I may try to pick your brains at some point once ive done that.......
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