- Joined
- Oct 3, 2005
- Posts
- 6,059
I bought RAZO's broken Sigma Raijin, hoping that the video board was repairable. It is, in the barest sense. A few traces were vaporized, the circuit board was cooked clean through in one place, and every IC was dead. Luckily, it's a pretty simple board, with all standard parts, and essentially all of them are labeled in silkscreen. With a knockoff Hakko and 1997's most affordable oscilloscope, I got to work.
This is what the video board looked like to begin with:
I clipped off the obviously fried parts and took the pins out with solder wick.
I desoldered all the ICs too. I replaced the ICs with sockets, and replaced any questionable passives too.
I don't have an LM1881N or a CXA1645 on hand, but I replaced the standard logic parts, and saw that the subcarrier oscillator (CXA1645 pin 6) and asynchronous autofire (connector pin 4) both worked.
When I get the video parts in, I'll post pictures of it (hopefully) working.
This is what the video board looked like to begin with:
I clipped off the obviously fried parts and took the pins out with solder wick.
I desoldered all the ICs too. I replaced the ICs with sockets, and replaced any questionable passives too.
I don't have an LM1881N or a CXA1645 on hand, but I replaced the standard logic parts, and saw that the subcarrier oscillator (CXA1645 pin 6) and asynchronous autofire (connector pin 4) both worked.
When I get the video parts in, I'll post pictures of it (hopefully) working.