Performa 550 help

[gwb21471]

I have a performa 550 that i been restoring slow. When i first got it it wouldn't do anything. After i bought a new battery and clean the contact on the motherboard and the other boards. Now when i hit the power button on keyboard i get a buzzing like sound in the speaks that sounds like a chime but more gargle. But the monitor won't turn on and it won't do anything else. I starting to think the monitor half is bad or i not getting the right voltage to the boards. Does anybody know where i may get the wire diagram for it so i know what voltage should be going where. I starting to think the analog board is bad. If the motherboard is good maybe if i can is to replace the crt screen with a lcd screen. Thanks for the help.

 

[robin-fo]

You will need to replace the capacitors on the Logic Board and possibly also on the Analog Board

 

[gwb21471]

You will need to replace the capacitors on the Logic Board and possibly also on the Analog Board

The guy I bought it off of replace the capacitors back in 2018 he told me on the motherboard and few on the analog board that needed it. After he did that it work great for a year and it just went off and never came back on. I think the power supply maybe bad.