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Thanks for the replies...I solved it. I traced the vsync back, and back and finally found E8 (74ls20) pin 6 stuck high. , cutting that out, socketing and replacing E8 fixed the sync issue, and also I now got a cursor! Seems this board is really fussy about IC's, and I had to do a bunch of 6520...

This is my Pet in a suitcase project that I repaired and built many years ago now. At the time it was working well, but as since decided to be a pain. The system is basically a 2001 motherboard and transformer/capacitor in a suitcase with a small board mounted to the video out header to produce...

Yeah maybe...Can't think what would have caused all this damage...Maybe one component failed and then there was just a cascade of failures from that...The last thing I realised that had also failed was the 12v fan :-(

Ok, just for completeness I will wrap up this thread. John (I can't take any credit at all) finally got the PSU working! It was another monumental effort where we even considered gutting it and putting in a modern power supply. In the end John found more dead parts (mostly diodes) which finally...

Thanks, yes that's been checked. It's full wave no doubler

Base emitter voltage is 1.4v on both Q! and Q2

Ok...some more time has been spent with the PSU. So here is what it does: If powered up off 220vac mains, Q1 and the 12v regulator both get killed (these two are obviously in very different parts of the circuit!!!), Q2 seems like it never dies. If the PSU is brought up slowly using a Variac to...

the transistors in question are Q1 and Q2

Hi. I believe the schematic is shown on post #4.

Thanks for the reply. I don't think the LM1086 could handle these voltages

Thanks for your reply: “Without a circuit diagram, how did you determine that the two transistors are being used as switches?” Seems very similar to the 5155 PSU diagram found here: https://slx-online.biz/hursley/docs/5155_psu.pdf …and have been using that as a general guide. Parts in question...

...for reference the power supply is like this one: You can see the two transistor in centre bottom of the main board. can be seen here: https://commons.m.wikimedia.org/wiki/File:IBM_PC_XT_5160_Power_Supply.jpg?fbclid=IwAR2NPN_3VXYWkUz6k8_F_F71ZC65dpdtTz9c0sVGJefspS2DCG4wf-WjR3I

Hi all, a friend and I have been working or resurrecting a 5160 PSU (220v). It's been a mission! We have replaces a number of components that were either obviously dead or corroded and crumbling. Unfortunately, still no luck getting it to work. I was wondering if anyone recognises this part...

The actual PCB doesn't look that bad from the photo...the components on the other hand....!

Curious if you can remove the CF card and put it into a XTIDE on another retro system (5150?) and if it would likely boot to dos?

Very excited for this board to be released. I was thinking to build another XTIDE, but I like the idea of this board being so...versatile. Waiting patiently. @FreddyV

Why don't you start a new thread? I think it would be beneficial.

:) thank you everyone!

I snipped leg 16 on U10. The connected part of the leg was still low :) To be more sure U10 was the culprit, I piggybacked the 74ls373 with pin 16 (A18) leg raised. I then jumpered that raised leg across to the A18 pin on the slots. I powered up and was greeted with some beeps from the speaker...

Yes...thought about doing that. I'll do that before cutting it out completely. Can I probe A18 coming out of the CPU for any further insights? I saw in your guide that you recommended not testing the 1111 1111 1111 1111 0000 pattern from the CPU Thanks