C64 ASSY 250469 Overvoltage Repair

[@roheinz5007]

Jan Beta Tag - immer ein guter Tag 😂👍🏼

[@blackcountryme]

Happy Christmas, as I'll probably forget

[@projectartichoke]

Your logic was impeccable. And, you got it working in the end. This video was very enjoyable, as always.

[@horusfalcon]

Wow, Jan, a short board that got zapped? Was the infamous Commodore "Brick of Death" involved? (If you said, I missed it.) That Keysight scope is one serious piece of equipment! That double-stack CPU looks gnarly, but it works, so good for laughs. All in all, some more of the outstanding troubleshooting and repair we've come to expect from you, man. Have a Happy Hacking Holiday Season!

[@harihegen]

Sehr spannende Fehlersuche heute! Sehr schön gemacht!

[@myleft9397]

Overvoltage!? This might be a shocker

[@giuseppelavecchia775]

Nulla puo tenerti testa Jan,numero uno!

[@twocvbloke]

Sounds like your desoldering station might become a repair video in itself with the odd noises its' making... :P

[@donaldblakley6796]

Just need to to clean them and maintain them frequently

[@donaldblakley6796]

Excellent work and great video:) I've soldered a cpu in a socket before when I broke a leg off unfortunately. I've also have had bad contacts on the ports in the past. Isopropyl and q tips and pencil eraser in the past. Now I do that first, then a little dab of brasso polish on micro fiber cloth, and then Isopropyl again to clean up residue. Makes contacts on user port and cassette port mint! That's how I clean nes, snes and N64 games. Works perfect every time

[@samuraidriver4x4]

Nice one Jan, another one "fixed" Wasn't the easiest one that's for sure. Still debating if i should get a Commodore 64c like i had back when i was single digits of age😂

[@ownpj]

The 4066 has nothing to do with CIA2, that was just dirty contacts on the userport. 36:19 While the cassette port is controlled directly by the CPU, incoming data is read by CIA1. If you didn't have the cassette IO lines soldered on the CPJ correctly the signals wouldn't loop back through the harness and into the FLAG input on CIA1.

[@tndabone]

Double wipe sockets are still a thing and I still have much better luck with them over the machine pin sockets.

[@humidbeing]

Agree. I just do not understand why people like machine pin. Dual wipe is superior in every way. Chips don't pop out, can accept desoldered chips, etc etc etc.

[@LeftoverBeefcake]

+1 for double wipe sockets. I've had cases where machined pin sockets are too small to accept some pin headers and stuff wouldn't fit. :(

[@sx64man]

Double wipes should be used for IC insertion, precision should be used for where straight pin pcb modules are used (replacement PLAs etc...)

[@donaldblakley6796]

For sure, especially with a desoldered short pin ic.

[@holleholl3057]

Mein DiagTest bezeichnet bei vielen Shortboards oft auch viele 6526er mit dem Testharness als "BAD", obwohl die TODs syncron laufen. In aller Regel funktionieren die dann auch. Kaputt sind die wirklich nur, wenn die TODs nicht syncron sind...In vielen Fällen war es dann auch der 4066, es kann aber auch an einer der Dioden am Userport liegen, kommt eben drauf an, welcher angezeigt wird. Ein "marginaler" SID kann auch für Probleme und falsche Angaben des DiagTests sorgen oder eine schlecht im Sockel sitzende CPU , naja, in Shortboards sind die ja in der Regel eingelötet...

[@dougjohnson4266]

It is good to keep these old computers working.

[@icedearth2013]

good video

[@drphilxr]

More VC/Vic/FIK-20 repairs also please danke! 😅