Looks like I'll be getting a Mega ST4 soon

[exxos]

Never hurts to have some extra pull-ups available in various locations on the H4.

[PaulJ]

Never hurts to have some extra pull-ups available in various locations on the H4.

I really didn't put it out there as a challenge.

[rubber_jonnie]

Don't cut it off RJ, bend it up and if you ever need another pullup you can wire wrap to the pin that's bent up along the body. Never hurts to have some extra pull-ups available in various locations on the H4.

Good idea!

[rubber_jonnie]

I really didn't put it out there as a challenge.

Oooh, I like a challenge!

[rubber_jonnie]

I decided that today was the day for pulling out the resistor packs from the Mega 4 in preparation for the arrival of the 9 pin 2.2ks. Interestingly I found this resistor pack was cracked in the middle.

IMG_20191214_143829.jpg (175.31 KiB) Viewed 3538 times

I know I didn't break it during removal but it could be a clue as to why things have been erratic if only three of the resistors were actually doing anything.

I'll post again once I have the ones installed.

The other thing is that some of the vias are already in a terrible state even before I get started. Nothing that a bodge wire can't fix though.

[PhilC]

Funny what you can find when fixing old Megas, well done finding that SIL, woulda been a pain to find otherwise.

[exxos]

Wow a cracked sil wouldn't help things that's for sure.

[rubber_jonnie]

It potentially answers the questions of why it would sometimes just die when I next powered it off and on. I'd manhandle the board, then it would work again. Possibly the cracked SIL making and breaking a connection. Finally when I manhandled the board a lot during the CPU removal, I reckon it finally finished the SIL off.

We'll see what happens when I fit the new ones.

@exxos it had a mix of 4.7k and 10k, I take it 2.2k all round is fine?

[exxos]

@rubber_jonnie yeah I use 2.2k all around.

[rubber_jonnie]

@exxos Cool thanks.