Dual Daytona USA stopped working

rajcic

Member
Joined
Jan 8, 2014
Messages
117
Reaction score
11
Location
California
I have a dual Daytona USA that has always been a bit finicky but always worked. Sometimes only one side would turn on and I'd have to power cycle the unit to get both to boot up. But it was like that for 12 years and always eventually worked. Now one side only boots to a garbled screen. Both units turn on and go through the force feedback calibration where the wheels fully cycle side to side. The power supply has 5.10V at the power supply. But I'm not sure where on each board I need to verify 5.10V. IMG_9674.jpegIMG_9673.jpeg
 
I posted this in another thread awhile back. For measuring power at the board. Daytona HATES not being at 5.1 at the PCB.
 

Attachments

  • IMG_0902.png
    IMG_0902.png
    533.4 KB · Views: 9
Resolution is just below where I can run history of Game Bd. Can you get me clean pics of CPU Bd so I can check it? As for vcc check, check for 5.10dc exactly at front of cage on any of the four power input connectors (yellow/white wires) or across PC96 decoupling cap on CPU Bd just around the corner from green status LEDs.
 
Also, since this is a twin, you can swap Game and I/O Bds to confirm they are OK. Looks like I/O Bd is OK but since you're in there it doesn't hurt to verify.
FYI 99% of the time on this platform, this rug pattern indicates liquid damage / corrosion on CPU or ROM Bds. Fixed well over 2000 of these that had corrosion damage.
 
interesting the voltage is very low at that location, 4.8v. I have to turn the power supply up to 5.35 to get 5.1 at that location. I don't think I've ever had to run the supply that high. I will try swapping boards around tomorrow, thanks for all the suggestions.
 

Attachments

  • IMG_9676.jpeg
    IMG_9676.jpeg
    730.3 KB · Views: 5
Finally found some time to swap the main 4 board stack. The problem stayed with the unit, so it is not the main stack. The row of green LEDs on the unit that isn't working does not light up like the side that is working. Not sure what to check next.
 
This issue is either 5v is well below 5, bad Game Bd stack (confirmed not), I/O Bd or connection from Game Bd to I/O Bd in cage. There is nothing else that will kill Game Bd. Feel free to call in. My user name is my website.
 
I/O board seems to be the culprit. I swapped em and the problem followed. I will reach out about sending it to you for repair, thanks!
 
Back
Top Bottom