fish tales woes
original issue was no power up (which I found to be caused by the main harness from the transformer heating up and melting together shorting every wire in the harness as well as damaging the transformer and PDB (I believe part of this was caused by the 10 amp fuse I found in the main fuse block when I started troubleshooting as well as the large number of upgrades the customer had added including replacing the DMD with an LCD upgrade)). PDB was sent to anther company for repairs including new pin headers for J102 and J103, and replacing C2,C4, and C5 however once the customer received it back he just plugged it back into the machine the shorted harness caused more problems. which is when I was called.
I have repaired the PCB traces that were burnt out.
I have done a wire for wire replacement for the entire harness from the transformer to the PCBs
I have replaced the trash transformer
I also replaced BR2 as most of the traces under it were burnt out and I didn't want to have to worry about it after repairing the traces.
I also replaced a blown C11 as well as Q1 and R260 all were visibly blown figured Id change out C6 and C7 while I was swapping C11 as well.
the main fuse blows the moment I plug in J102 to the PDB. I haven not checked the other plugs yet as I have a fixed amount of 8 amp fuses right now.
the thermistor in line with the EMF and the main fuse looks ok. (I only mention this as when I search for this issue, this comes up as an issue in a few threads)
I'm honestly at a lost now as to why I'm still blowing the main fuse and why it would do this with just J102 plugged in. the obvious reason would be a short on the PDB, but I can not find any signs of one.
any ideas where I should start looking next would be greatly appreciated.