Recent content by 8tto

Good to hear! Did it change while you fiddled with the adjusment-pots or the software-controlled contrast? ([f it suddenly appeared and then suddenly disappeared, it might come back one day: it could also be worn or dirty adjustment-pots on the analogboard. But that’s for another day :-]

Hi! When the color changes during use it hints at a bad connection somewhere. If the picture is purple you are probably missing the green channel and it might be fixed by checking for cracked solders on the analogboard. So a reflowing off the analogboard and espesially the connetion to the...

You don’t need a load to test the PSU, but the voltages won’t be right until you do. @JDW have a nice video about it on YouTube. Much better if it’s just the switch, though :-)

I haven’t tried it myself, but read several places that you can start the CC without the logicboard. At least you should get the fan and HD spinning and have some indication of a functional analogboard?

Regarding fan noise: check out @JDW excellent YouTube video The hard drive might also be noisy at this age.

Hi! Congratulations on new Macs! I`ve recapped two Color Classics (motherboard and analog-board), but never had to, or had the ability to, fix anything more electronically complex. The Service manual (https://tim.id.au/laptops/apple/legacy/color_classic.pdf) is great is a grate guide for fixing...

Hopp! It’s hard to say if the SE, SE30 and the Color Classic suffer from the same problem. They might just need rinsing the video adjustment pots of the brightness knob (in the SEs]. Or reflowing/cleaning the the connections from the analog board?

Hi, in system 7.5.? you also need to ResEdit the second System-file (sorry, I don’t rember its name: “System Recourses”?). Sounds like testing the 578 in another machine is the safest bet. If not possible: cleaning the edge connector as mentioned and resetting or replacing the v-ram sims?

Sorry for resurrecting an old threa (I also did this before the forum meltdown). My 6500 mb also started behaving like this after a recap. Does anybody have a clue where to start looking for errors? Mine does a restart from the keyboard. I’ve tried without cache-card and moving the RAM around, a...

Update: changed both pots for Blue Gain and Blue Background. The blue channel was back for a while and then disappeared again. Am I right assuming the videosignal comes from the analogboard edge connector, through the gray cabel into the white connector to the left in the picture in my last...

Yes, it might be. I was wondering if the low voltage from my powerbrick is making these coils struggle at startup? Mine are looking a little better than yours and have a different number on them. But Google won’t help me find our what they are.

I think Phier is the brand name on the trim-pot :-)

Its not dead! Washed the board with isopropyl alcohol and a toothbrush and rinsed in tap-water (I know this is wrong) and let it dry a couple of days. It booted when put in the powerplug. A shriek from the corner of the MB with caps before booted fine and reached the desktop. The unpolarised...

Changed this cap one more time, and the image is stabel again! Still waiting for new pots to see if that fix the blue channel. 

Yes, your right! The diameter is to small. Here is pictures of my board with new caps.