Power Macintosh 5500 /275

[tonata]

Hi,

I have a problem with a Power Macintosh 5500 / 275. Nothing shows on the screen. It does the start-up chime and it might actually be working, but the screen is probably dead. There is no hard drive and no battery.
Here is a video: https://drive.google.com/file/d/1IehrCvXrmGXTi7n_CE2Xsq88J26H_Om0/view?usp=sharing
The Macintosh does some weird noises. I changed a bad capacitor on the power supply, but it did not help much I think. The CD-ROM does not open when pressing the eject button.
And 2 photos of the CRT card. There is a hole from physical damage:



I am open to ideas.

 

[ClassicHasClass]

That doesn't look good, but I'm not sure that's actually the cause. What's on the other side of the board?

You could try adjusting the brightness controls on the flyback (be very careful around the high voltage there) to see if you get any picture at all. Short of that, in order, the service manual recommends looking at the analogue/video board, power supply and the CRT itself.

 

[GiGaBiTe]

You have multiple failed solder joints on that flyback transformer. You'll need to reflow all of those joints, and any other ones that look broken or dry.

As for the hole in the board, no idea there. Maybe check to see if the pin to the right of it is routed to anything on the other side of the board.