techknight
Well-known member
its not a problem, theres no way to know unless you try, and i did. hehe.
-
Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.
Macintosh TV in need of repair - need advice
- Thread starter krye
- Start date
Alex's Apple Orchard
Member
Agree with techknight and krye...never any worries.
krye
Well-known member
Sweet! Just scored a working 575 on eBay for $60 bucks w/keyboard and mouse, 36 MB RAM 160MB HD.
See, patience is the key. It's been 5 months since I picked up the Macintosh TV. I knew if I kept my eyes on eBay long enough, I'd find a suitable donor.
Can't wait to get it so I can swap the guts! Woo haa haa haa!
See, patience is the key. It's been 5 months since I picked up the Macintosh TV. I knew if I kept my eyes on eBay long enough, I'd find a suitable donor.
Can't wait to get it so I can swap the guts! Woo haa haa haa!
onlyonemac
Well-known member
If I got a working machine like that, I'd keep it. So rare are Macs that already work...
onlyonemac
Well-known member
Shame no! Save that poor LC!
krye
Well-known member
I'd much rather have a working Macintosh TV than a working 575 even if the guts are the same. It's all about the black enclosure! True, the Macintosh TV used a "modified" 575 board, but I'm not going to actually watch TV on it.
On the bright side, I also have a 520 that doesn't boot that also might benefit from this conquest. I can't figure out if it's the analog board or the logicboard that's dead. Maybe after all is said and done, I have something left over that I can use to resurrect the 520. If I can get two machines working by taking apart the 575, then it's a win-win.
On the bright side, I also have a 520 that doesn't boot that also might benefit from this conquest. I can't figure out if it's the analog board or the logicboard that's dead. Maybe after all is said and done, I have something left over that I can use to resurrect the 520. If I can get two machines working by taking apart the 575, then it's a win-win.
krye
Well-known member
Got the 575 in the mail last night. I opened it up and cleaned out the dust bunnies. I had a look a the analog and logic boards. Everything looks good. No leaky caps. I plugged it in and fired it up. Works like a charm.
Hopefully this week I'll have time to use it as a test bed for the boards inside the Macintosh TV and 525 that I have. That way I can find out exactly what works and what needs to be fixed. In the end I know I can at least take the guts out of the 575 and put them in the Macintosh TV enclosure.
Hopefully this week I'll have time to use it as a test bed for the boards inside the Macintosh TV and 525 that I have. That way I can find out exactly what works and what needs to be fixed. In the end I know I can at least take the guts out of the 575 and put them in the Macintosh TV enclosure.
krye
Well-known member
Here it is. Pretty filthy, but it works.
It was pretty dusty inside.
I can't wait to take it apart and test my other boards. I plan on taking a bunch of measurements on the good analog board and then compare them to the Mac TV and 525 boards. Maybe I'll be able to identify the point of failure.
It was pretty dusty inside.
I can't wait to take it apart and test my other boards. I plan on taking a bunch of measurements on the good analog board and then compare them to the Mac TV and 525 boards. Maybe I'll be able to identify the point of failure.
Chirping or ticking means the power supply is trying to come up, but detecting a fault condition and shutting down, only to repeat a moment later. This means several things. First, the primary side of the power supply and chopper transistor are ok, otherwise the fuse would be blown and there would be no action at all. Next, either something connected to the power supply has a short, or the short is in the output section of the power supply itself. I'm not familiar with the internals of these particular machines, is the monitor powered by (or part of) the power supply? If so, I would suspect the horizontal output transistor. Otherwise, I would start by checking the rectifiers and electrolytic capacitors in the power supply.
krye
Well-known member
I got the Performa 575 parts moved into the Macintosh TV and it's up and running.
I used the Performa 575 as a test bed for the Mac TV analog/logic and the LC 520 analog/logic, as well as the extra analog board that I bought.
As it turns out:
- the Mac TV analog and logic boards are both dead
- the LC 520 analog is dead but the logic is good
- the extra analog board that I picked up is dead too
The Mac TV must have been hit by lightning or something, because everything in it was toast. Analog dead. Logic dead. The CD-ROM wouldn't read disks. It would split them right out. The flopy drive too didn't seem to work. It just complained that disks were unreadable, and then failed to format them. The hard drive was dead too. I even swapped out the CRT becasue the one in the Mac TV was burned in. You could see the menu bar at startup.
Also, the guns were misaligned becasue none of the colors matched up. The display was slightly rotated and jammed up to the top left hand side.
I think the only thing I got out of it was the enclosure.
In the end, it's good to finally see it up and running after 5 months of trying to get parts for it.
I used the Performa 575 as a test bed for the Mac TV analog/logic and the LC 520 analog/logic, as well as the extra analog board that I bought.
As it turns out:
- the Mac TV analog and logic boards are both dead
- the LC 520 analog is dead but the logic is good
- the extra analog board that I picked up is dead too
The Mac TV must have been hit by lightning or something, because everything in it was toast. Analog dead. Logic dead. The CD-ROM wouldn't read disks. It would split them right out. The flopy drive too didn't seem to work. It just complained that disks were unreadable, and then failed to format them. The hard drive was dead too. I even swapped out the CRT becasue the one in the Mac TV was burned in. You could see the menu bar at startup.
Also, the guns were misaligned becasue none of the colors matched up. The display was slightly rotated and jammed up to the top left hand side.
I think the only thing I got out of it was the enclosure.
In the end, it's good to finally see it up and running after 5 months of trying to get parts for it.
krye
Well-known member
Thanks.
There's a whole writeup and walkthrough on my hobby site if you want to check it out: http://appletothecore.me/files/mac_tv_restoration.php
There's a whole writeup and walkthrough on my hobby site if you want to check it out: http://appletothecore.me/files/mac_tv_restoration.php
Alex's Apple Orchard
Member
Congrats!
Great write up on your site as well! Thanks for taking the time to do that. You've inspired us to take another shot at ours.
Great write up on your site as well! Thanks for taking the time to do that. You've inspired us to take another shot at ours.
krye
Well-known member
I might just keep all the spare parts as backup. Most of it's dead.
The only thing left from the 575 is the CD-ROM drive. The case is in bad shape. As soon as I touched the front bezel, it just fell off. Most of the clips that hold it in are broken. Same as the back I/O panel, one of the clips is broken off.
As far as the LC 520, it's the floppy drive, logic, and CRT.
The only thing left from the 575 is the CD-ROM drive. The case is in bad shape. As soon as I touched the front bezel, it just fell off. Most of the clips that hold it in are broken. Same as the back I/O panel, one of the clips is broken off.
As far as the LC 520, it's the floppy drive, logic, and CRT.
