And here are the bags of fun that are going towards this make over

One Exxos recap kit and a bunch of metal film resistor replacements:

Well I tried to start recapping this PSU over the weekend but got caught up in the STF Remake Reset Circuit fun viewtopic.php?f=19&t=1234

So I thought I would post a pic before this bad boy gets a make over.

Before:

EDIT: I'd say this one is the best candidate to try next... https://uk.farnell.com/microchip/mic6315-29d4uy-tr/reset-active-low-2-93v-20ms-4sot143/dp/2510415?st=MIC6315 Even though I detest evil bay.... https://www.ebay.co.uk/itm/5pcs-SOT-143-SOT-143R-SMD-DIP-Adapter-Breakout-Pinboard-Dual-sided-4-...

exxos wrote: ↑

Mon Nov 12, 2018 12:27 am

http://www.ti.com/product/TPS3808/technicaldocuments

Looks good.. But output drive seems a bit wimpy

I guess a small MOSFET could be used to beaf it up.. Still smaller than a TTL chip..

Did you look at these https://www.st.com/en/reset-and-supervi ... m1816.html

exxos wrote: ↑

Mon Nov 12, 2018 12:16 am

I will have a look for a better reset chip tomorrow.. There are things like the LP3470 , must be some chip out there which has a good drive current so can do away with the LS05 all together..

That would be great if that is the case. The less chips the better.

exxos wrote: ↑

Mon Nov 12, 2018 12:03 am

Aye, doesn't seem like its going to behave wonder if the 555 circuit could be rejigged to give a inverted output

Yep 47K made no difference still white screen

Definitely feel like with this circuit. I tried out so many combinations today.

Hmm - with 100nF and 470K white screen and no boot. Reset button stays on white screen no boot or flicker of reset. Damn... Try 47k.. Its a crazy one this one trying to find the right combination. This is going to be the last one tonight. Am all reset out today. Didn't get anywhere near my recap ta...

Hmm - with 100nF and 470K white screen and no boot. Reset button stays on white screen no boot or flicker of reset.

What capacitor value do you have in at the moment 22uf ? and 1K ? I think the problem is the switch isn't discharging the capacitor fast enough... even when it is, the reset pulse low is just to short... Try something like 100nF and 470K any higher values on either and it will malfunction (accordin...

I'm starting to think that the 555 circuit is probably the best one so far. Here is a video of the board booting with the simple circuit and then reseting and on the second reset it goes into the strange frozen bigger desktop and takes several resets to get it to reboot. Apologies for the shaky vide...