iaintavinit
New Member
- Joined
- Jan 7, 2026
- Messages
- 4
Hi everyone, I recently received a mostly dead Performa 577 from work that we were going to junk. After some diagnostics, I found there wasn’t any high voltage to the anode cap or heater voltage to the CRT. The computer would power on, but wouldn’t chime. I checked voltages and +12v and +5v were both great.
I did a bulk recap, and surprise, it didn’t fix it. I expected this, however it can’t be a bad thing to get those old caps out of there. Also recapped and ultrasonic cleaned the logic board.
I believe I have a dead flyback being I’m missing both heater voltage and HV output. I checked the horizontal output transistor and it isn’t shorted. After comparing, both my Apple M0401 and M1212 monitors use different flybacks. I have a junk parts M1212 I thought I could steal parts from if it was the same, as they use the identical model of Trinitron picture tube (M34JNQ10X).
Has anyone experienced dead flybacks in these LC/Performa all in one machines with Trinitron tubes? Any advice is appreciated!
I did a bulk recap, and surprise, it didn’t fix it. I expected this, however it can’t be a bad thing to get those old caps out of there. Also recapped and ultrasonic cleaned the logic board.
I believe I have a dead flyback being I’m missing both heater voltage and HV output. I checked the horizontal output transistor and it isn’t shorted. After comparing, both my Apple M0401 and M1212 monitors use different flybacks. I have a junk parts M1212 I thought I could steal parts from if it was the same, as they use the identical model of Trinitron picture tube (M34JNQ10X).
Has anyone experienced dead flybacks in these LC/Performa all in one machines with Trinitron tubes? Any advice is appreciated!