Aug 302014
 

Got a mammoth box of boards from Ben76 the other day. This Star Jacker PCB is one of them.
Game gave a black screen when powered up and there was no sync signal.
Ben also gave me a scan of the schematics for this board so was quickly able to determine where the sync came from.
My heart sank a little bit as the sync comes from a PAL16R4 chip
sj-sync

On investigating I found the VCC pin was not making a good contact in the socket so I removed both of the PAL sockets and replaced them.
IMAG0839

So booting now gave me sync but solid white screen. Ive seen this before on quite a few boards and its almost been RAM issues. I started probing the RAM chips and found a 2016 SRAM at location IC151 had completely dead outputs despite being enabled and having active inputs. I desoldered it and replaced it with a 6116 SRAM chip.
IMAG0840

Now I get this (NOTE: the red colour is actually present but I have to edit my pictures these days as the HTC One makes low light pictures all purple)
IMAG0842

IMAG0843

All fully working again.

  2 Responses to “Star Jacker repair log”

  1. Legend 🙂 great fix and write up

    – Ben

  2. Indeed! Another great fix from the great fixer! Well done Porchy 🙂