31 Oct
2016
31 Oct
'16
12:51 p.m.
My recent Executel addition has a 5" screen with
associated analogue board
that seems to be powered from a display chip I can't find any info on, and
Well, it won't be _powered_ from that IC. My guess is that said IC provides
the HSync and VSync signals, the video comes from other devices on the
main PCB. But that is a guess without seeing the machine/
[...]
I've also removed, checked and replaced out of
spec capacitors, one of them
was a 680nF 50V radial. I could only find a 63V PET version on cpc's website
and did much reading on differing capacitor types, concluding that it SHOULD
be OK.
I would be very surprised if that was not OK.
[...]
Hence the question - am I wasting my time without a
schematic for this
analogue board?
You haven't told us what the problem is.
Do you get anything on the screen? Is the CRT heater glowing? Have you
measured the CRT pin voltages?
I can see one IC on that 'analogue board'. Looks to have metal heatsink
tabs so I am going to make a wild guess that it's a TDA1170 vertical
deflection IC Are there any other ICs on the board? My guess is that
the 'analogue board' could be reverse-engineered without too much
work.
Can you provide a clear picture of the component side of the
board with nothing else in the way?
-tony