Hi quench thank you, I really appreciate the help.
Those might be slow blow fuses - can you give me the full part/codes they're marked with?
I have pulled the fuses and they read:
F1 F10A / 250 vp 312
F2 BUSS / 4GC 3/4 250 volt
F3 BUSS AGC 4 32/
F4 F5A / 6OV PBi
F5 BUSS 4GC 20 32V
F6 (upside down pyramid with lines in it) 3A 250v 313
Behind those three bridges is a rectangle aluminum spacer that sits between the bridge and the metal frame the board attaches to. Are you adding any thermal transfer paste to the back of the bridge and that aluminum spacer and then screwing it on?
Yes, the spacer is there and with the 2nd BR1 I added more thermal paste to it. The 1st BR1 I fitted that worked I didn't have the paste and thought there was enough residual left on the spacer....that then was followed by the BANG while playing.
The feature lamps on the playfield have power from that BR1 all connected together via a bare braid wire stapled to the playfield and connected to the base of each lamp (a lot of people confuse this braid wire as ground but it's not - it's feature lamp power). Lift the playfield and carefully follow the braid wire to each feature lamp looking for any potential short circuits to anything else. Do the same with the light/display door in the backbox (where the feature lights illuminate behind the backglass).
This was news to me, I thought the braid was ground as it came off the metal frame of the backbox and joined the braid that continues into the machine under the Playfield - see photos. There seems to be no way this connects up to the rectifier board. So not quite sure what to do about that.
BTW, those bridge rectifiers are directional - you are installing it the correct way??
Yes, the new bridge rectifiers I bought were placed corresponding to the +- on the holes on the rectifier board. The BR's also have a curved corner to show which one is +.
Those four (CR1, CR2, CR3, CR4) diodes form a bridge rectifier. They rectify the high voltage going to the displays.
Interesting, they look very dark in the photograph I just took. I will try and find older photographs I took of the rectifier board before the bang and see if they got fried. Maybe that's why my scoreboards aren't working anymore?84014016_196550514924462_29583897943605248_n (resized).jpg87385130_490313611634093_1130035925988933632_n (resized).jpg