dontdoxmeman
Member
Reposting this thread since the old forum ate it:
My Studio Display I’d recently purchased on eBay had a failing flyback transformer, which was unfortunate since the plastics and the tube itself were all in great condition. The monitor would make a loud click/popping spark noise and the image would go away and come back with a zooming effect.
I found that the HR46162 was a equivalent part to the original. Despite a forum post elsewhere I saw where the poster thought the HR Diemen flyback wasn’t correct because it didn’t have the same number of pins, I took a chance and ordered one from https://www.electronica-usa.com/product_HR46162.html. Before ordering I noticed that (with the old flyback still in-circuit) the missing pins were directly connected to others, so I figured it would be fine. Turned out that yes, those missing pins are internally connected.
The new flyback came with an instruction to disconnect a particular capacitor from the monitor’s circuit board. I found a cap with the same silk screened PCB reference number as the instructions and cut it off. The new flyback didn’t quite fit in place of the old one due to closely packed components, but I shaved off an unused part of the flyback’s board to fit it.
I ended up cutting the wires from the old flyback that went to the video board, and soldered the new flyback’s wires to their ends since the new one didn’t have connectors on those wires.
To give the new flyback as long a life as possible by keeping it from overheating, I installed a spare PC case fan I had lying around in the top of the RF shield for the monitor. I found a 5V supply in the monitor and soldered some pins to it and ground so I could just attach the case fan easily.
With the new flyback transformer, and after adjusting the G2 and focus, the monitor looks great! The Diamondtron CRT is just fantastic.
Since somebody asked on the previous thread, here's a link to the disassembly guide: https://www.applerepairmanuals.com/the_manuals_are_in_here/Studio_Display_17.pdf
My Studio Display I’d recently purchased on eBay had a failing flyback transformer, which was unfortunate since the plastics and the tube itself were all in great condition. The monitor would make a loud click/popping spark noise and the image would go away and come back with a zooming effect.
I found that the HR46162 was a equivalent part to the original. Despite a forum post elsewhere I saw where the poster thought the HR Diemen flyback wasn’t correct because it didn’t have the same number of pins, I took a chance and ordered one from https://www.electronica-usa.com/product_HR46162.html. Before ordering I noticed that (with the old flyback still in-circuit) the missing pins were directly connected to others, so I figured it would be fine. Turned out that yes, those missing pins are internally connected.
The new flyback came with an instruction to disconnect a particular capacitor from the monitor’s circuit board. I found a cap with the same silk screened PCB reference number as the instructions and cut it off. The new flyback didn’t quite fit in place of the old one due to closely packed components, but I shaved off an unused part of the flyback’s board to fit it.
I ended up cutting the wires from the old flyback that went to the video board, and soldered the new flyback’s wires to their ends since the new one didn’t have connectors on those wires.
To give the new flyback as long a life as possible by keeping it from overheating, I installed a spare PC case fan I had lying around in the top of the RF shield for the monitor. I found a 5V supply in the monitor and soldered some pins to it and ground so I could just attach the case fan easily.
With the new flyback transformer, and after adjusting the G2 and focus, the monitor looks great! The Diamondtron CRT is just fantastic.
Since somebody asked on the previous thread, here's a link to the disassembly guide: https://www.applerepairmanuals.com/the_manuals_are_in_here/Studio_Display_17.pdf