Lisa 2/10 No boot, Raster, Speaker Clicking

[sigma7]

Thanks for the tip, I probed U68-LS132 Pin 3 and see basically the same thing.

Sounds like you've narrowed it down a lot!

Suggestions:

Check for physical damage to the transistors as they can be bent/broken by rough handling.

Check for +12V at R4.

Swap in another crystal (even a different frequency) to see if the rest of the oscillator circuit works.

[pugy365]

The transistors looked ok but the Hfe values on my tester were very low on Q1 compared to the Q2. Since I had some that would work I replaced the Q1 & Q2 transistors and had no change in my probe measurements or behavior of the machine. I also confirmed 12v+ at the R4 resistor, Im not sure I have a crystal on hand, but going to look and I ordered a new 16Mhz one which will be here in a couple days.

[pugy365]

More good news! I dug out a crystal in my parts bins and did a swap and the Lisa came to life and passed all its test besides the widget drive which is expected. I may start a new thread troubleshooting that. I will install the proper crystal when the part arrives tomorrow but really happy with this progress. Now to recap the power supply and wait for my ESProfile board to come in for a boot drive! I'll update once we I have Lisa OS booting but I think we are looking good. Again appreciate all the help here it has been indispensable for this more advanced repair for a beginner!

[ried]

Congratulations! Welcome to the party 

[AlexTheCat123]

Hey, that's awesome! Congrats!

Not sure if you know, but a rarely-used (or at least it seems rarely-used to me because very few people mention it) feature of ESProFile is its diagnostic mode, which might be pretty helpful in getting your Widget running. I spent far more time developing the diag mode than I did the emulation mode, so it's pretty full-featured, and supports nearly every command in the Widget's rather large command set other than the block read and block write commands. So you might be able to use your ESProFile not only as an emulator, but also as an aid to get your Widget running again!