I have a Proton AC-300 MkII CD player purchased in 1991 and the 7 segment green LED display is not illuminating.
Similarly the Time, Track, Pause & Repeat single LEDs are not lighting up when the appropriate button is pressed. Otherwise the CD and remote control sensor (which is also on the display board) are functioning perfectly.
The LEDs are all controlled by two CD4052B differential 4-Channel multiplexers and the 5 volt power rail seems to be OK to these ICs. Does anyone have a schematic or block diagram of a Proton or similar CD player with a 7 segment LED display which I can use to fault find.
I would have thought a 7 segment display should be pretty easy to trouble shoot once you understand the how they are controlled logically.
Thanks for your help
Similarly the Time, Track, Pause & Repeat single LEDs are not lighting up when the appropriate button is pressed. Otherwise the CD and remote control sensor (which is also on the display board) are functioning perfectly.
The LEDs are all controlled by two CD4052B differential 4-Channel multiplexers and the 5 volt power rail seems to be OK to these ICs. Does anyone have a schematic or block diagram of a Proton or similar CD player with a 7 segment LED display which I can use to fault find.
I would have thought a 7 segment display should be pretty easy to trouble shoot once you understand the how they are controlled logically.
Thanks for your help
Man! I'm exactly in your same position... trying to give life to this gem. Did you manage to fix it?
Can you take the PCB out from the front and take a front and back photo of the PCB ?
Just to know if the said PCB is original Proton or if it is Philips like almost all the rest of the player.
Just to know if the said PCB is original Proton or if it is Philips like almost all the rest of the player.
Hi! Seems like it is Proton, right? Any chance? I mean, I know how to weld and so on, but don't think I have the time to decode a Proton proprietary system for displays 😀
I have the same issue as well with my Proton AC-300 ii. Has anyone found a fix? It is a great sounding CD player so I would rather find a fix than throw it out.
Wishing you all the best....but that is a 30+ year old device. Some high end players (Sony) had lasers that were expected to last that long and mine has, and it's quality display too..but all the Phillips players I've had lost their displays.
🙄
I must have had a hundred, I must have between 25 and 30 left from all generations.
Apart from the first ones with the DIGIT displays and the “700” generation, none of the others posed a problem.