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I took away about every part in the feedback control circuit, and tested them out. However, my findings are different Resistors: R34: OKAY, reading of 1kOhm R35: OKAY, reading of 1kOhm R36: i have a reading of 12Ohm, schematics talk about 470? (resistor is also very different, more like disk...

Okay, today i've replaced the rectifiers (because I've read in the classic mac repair document that those are weak spots) However it didn't solve my problem. I started checking the feedback control circuit. I desoldered CR19 (the 6.2V zener diode) I connected it to a 9.5V battery and included...

This is really a top thread! Thanks for the research and the extensive reporting!

I've ordered replacement recitifiers for CR20 and CR21. When they arrive i'll install them and check the complete board again...

Alright, repair is done! I guess the flyback was still working. However, it wouldn't make any sense that if the flyback would be broken there wouldn't be any sign of life. Not even the power button led pulsing... This block diagram can be found in the manual. The motheboard is getting its...

Okay, resoldered the J4 connections. The rebooting problem remains, but i got something on the screen. A vertical line moving up. Readings on the lines are crazy. They start out fine at 5.02 V and 12.02 V, but after about 10 seconds they start going up really fast. Untill the reboot. I've...

I've resoldered the flyback once more, the J1 and J2 connectors and now I'm stuck in some continous boot cycle (without a screen). http://tinyurl.com/pbgw55a The plus boots and after about 10 secondes it enters boots again and so on... I"ve tried connecting a hard disk but didn't help. Any...

I don't know if the filaments light up, since i just get a very small oranje dot at the back: The wires in this glass tube don't lit up:

Okay, I've replaced all of the caps. But I still have a black screen. No screen activity whatsoever. When I plug in my external HD I can hear disk activity. Small overview of the actions I've taken: 1) Problem: when i used the macintosh plus for a while, the screen went black. Pushin the...

After recapping my powerbook adapter and nearly finishing recapping a Powermac G4 PSU and a macintosh plus board I started a bigger project. My iMac G3 died recently, when I pressed the powerbutton nothing happend. A bit of researched pointed me to the DCB and the PAV. I've started performing...

Okay, the anode caps looks okay again. Thanks I've checked the C1 cap again, today it's 4.02uF and 0.08 Ohm I've ordered all replacement caps, can't wait to plug them in. |) (PS: nvdeynde, I found your excell list on the forums, it was very helpfull)

Okay, fixed it! I've replaced all of the caps, my peak atlas said both C207 and C201 leaked. Now I get constant voltage of 7.8V Here's an overview of the 'official' caps if anyone is interested. (with their sizes) C108: ELNA 400V 47uF 16x25 (85°C) C111: ELNA 50V 47uF 6x10 (105°C) C201: ELNA...

I have a Macintosh plus which had some display problems. After a while the display went black, squeezing the sides would temporarly solve the problem. I've been reading a bit and found that weak soldering on the J1-connector often would be part of the problem. When I opened it up, I found...

I've ordered all Panasonic Caps low ESR online, hopefully they arrive soon. I've been measuring a bit of voltage yesterday. Input is fine constant at AC 230V. After passing the "S1WB" rectifier i measured constant DC 320V. Here's a picture with all the paths...

@techknight There's a tiny screw beneath the wire on that location. Anyway, here's an image with the caps on the board and their specs. http://s7.postimg.org/f1jmgr7yj/HPIM3731_edited.jpg I had a leaking 16V 1200uF, so I've replaced it. Furthermore I replaced the 16V 180uF with a 35V 220uF...

Okay, I cracked one open. It is possible to open it without damaging the case to much. Perhaps I could glue it back together? Don't forget to remove the one screw: The inside of mine looks messy. What do you think? Fixable? What should i get?

any succes?

Today I got a powerbook 170 and a 145b. According to the previous owner the 170 was the only one working. But apparently both are working, there's just a faulty powerbrick. I didn't own any 68k powerbooks to this date so I'm kinda a newbie on the subject. They seem like pretty cool machines...

On the back it just says "Macintosh", nothing more. I already posted the serial from the bottom of the case: F4430H9M0001P On the motherboard i found LB043400002951 on a sticker. A bit lower there's the Apple logo with 1983 next to it and 630-0101 and then i sticker with R2 printed on it (not...

Today there was a flee market near my place. I went looking for books and perhaps some old macs, you never know. Then suddenly I saw her. She was sitting on a small table, with keyboard and mouse. Next to the Apple logo there was ...... 'nothing'. As I approached several images of the...