Did you verify power at the ram chips ( I think I show this in the video)? If they are the original 4116 you need -5v, +5 and +12v at the ram chips. If you have good power to the ram chips, check my joust 131/134 ram error video.
What is a 131 Error? The factory Regulator had the heatsink mounted how so? How do you know which header pins to choose from if they don't list how much current amps rating the header pin can handle?
131 is a common ram error on Williams PCB. 1 means ram, 3 is ram bank, 1 is 1st ram in the bank. In the video, I said "I don't think the Bridge Rectifier came from factory with heat sink". Are you referring to headers or connector pins? This is a rat hole discussion but honestly most, if not all, are rated at least 7amps which is the max draw due to the fuses. You will be fine using trifurcon but I did use Molex 41695 box style on the transformer > PS board.
How many amps of current Trifurcon pins rated for? The Headers and connector pins are 7 amps but how do you know if the headers and connector pins are RATED for how many amps? When an arcade board has many decoupling caps and one of the decoupling cap is shorted. How can the ESR meter be a good way of finding which is the BAD shorted decoupling cap?
The answer to your amp rating question is look up the datasheet for the header and connector type because it depends. A shorted cap will likely read extremely low ESR which is an indicator but not definitive way to tell if the cap is shorted. I use a tester which also tests DCR and measures DC resistance of the capacitor. eds-inc.com/Eds88Aom.pdf
But if the Shorted decoupling Cap is Shorted that means its ESR is going to measure very low ESR resistance? and very low DCR resistance? even on all the Good Decoupling Caps because they are all connected on the power rails +5vdc to ground is one of the decoupling caps is shorted its going to make all the GOOD decoupling caps measure very low ESR resistance and DCR resistance?
Yes, for decoupling caps, because they are tied to same circuit, once one is shorted they all read similar with DCR. I show this exact behavior in my gorf ram board video. The one thing I didn't and haven't experimented with is changing the DCR ohm threshold so that it triggers at only very low DCR near shorted cap. In theory, the resistance to gnd should be less as you get close to the shorted capacitor. A current tracer would also be useful in this case but you sound like you have the answer.
Reseating the power connector to the main pcb. I haven't rewatched the video but if I didn't do so, I should have repinned the connector and put new header on.
@@jacklickI have the exact issue, but its on the 5v and not as acute as yours (game runs fine.) Inserting a multimeter probe apparently makes better contact than the original header pin, so measuring voltages can be confusing. I'll need to repin then. (Mentioning all this for the benefit of others.)
I did skim the video again and it looks like I had .4 volt change, for the better, on +5v line after new connectors and headers. It is worth the trouble. Good Luck.
