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Bit of an interesting one. Recently I was given an iBook G3 with a pile of assorted stuff and I could not get it to boot from the CD drive. In fact I couldn't even get it to *eject* the CD tray.  Once I had booted it from an external firewire disk it just could not detect either the internal...

GOOD GOD thats one for the books. I fixed it!  The 470k resistor that goes between the cut off potentiometer and ground had burnt out. Swapped for a replacement 330k (only one I had on hand, but the difference can be offset by the potentiometer) and we have a happy mac without scanlines...

Swapped the CRT board, reflowed all the joints, compared all the values to my SE/30s analog board and I can’t find the fault 

Hmmm I’ll reflow the joints. Hopefully that’ll help

Swapped the neck board with a spare I have, no change unfortunately 

Unfortunately adjusting the brightness and the brightness cut off had no effect 

My macintosh SE (that has been throwing me issues after issues) has yet another fault on the analog board! First it was the TDA1170 squashing the display, and once I had replaced that, the display has very prominent scan lines. Adjusting the cut off had no effect, and the two resistors (R20 and...

The CRT already has screen burn from its previous life, turns out it was the TDA1170!

This is somewhat following on from a previous project where I had an SE/30 with a vertical failure (link at the bottom), so this is just a bit of context.  With the SE/30 missing vertical I followed the dead mac scrolls, which suggested swapping the TDA1170 on the SE/30s analog board...

Thank you so much, replaced UF8 and it worked!

Whoops, sorry about uploading it as .heic, did it without thinking! Hopefully a UF8 replacement saves it!

So I have a bit of a problem I recently acquired an SE/30 that was showing symptoms of vertical failure - on boot up it only displayed a single horizontal line. After reflowing the joints on the P1 connector, replacing the TDA1170 on the analog board without any improvement I finally put my SE...