You're right about the current. I just checked it with my DMM and got
45ma. My inline power meter must not be that it's not that accurate at
the low end.
The display works; the backlight works; the processor must be doing
something since it prints a variety of messages. It's the RS232 that
has flakey. The hardest thing at this point is to unsolder the 16-pin
header. Bob suggests that a 12v regulator may have failed.
Leigh/WA5ZNU
In a message dated 12/05/2010 17:45:16 GMT Daylight Time, [email protected]
writes:
The monitor is a recent model and has the regulator. I left it on
overnight, in its original case and out in the open, hooked to a 13.5V
supply. I had it on a ammeter the whole time, and it never draws more
than 0.02A. The backlight is fine and the display works.
--------------------------
Something doesn't seem right with that current consumption.
Mine's not in use at the moment, as my test area is still stripped down,
but when it was I measured a consistent 47mA once the regulator had a high
enough supply to ensure it was regulating, in my case I was using 12 volts
but the current is determined by the regulator output voltage so shouldn't
vary much anyway.
The display is what was fitted originally fitted to the iCruze module but
the processor board has been changed so that Didier's Tbolt Monitor code can
be used.
The processor module circuit is pretty basic so I wouldn't have thought
there was too much room for a design error.
I'd be inclined to start by separating the processor board from the
display and then reconnect using a temporary link of flexible wiring so as to
be
able to check if the processor circuitry is actually drawing current, then
I'd probably continue by looking for quality issues, bad joints, solder
bridges, etc.
If that turned up nothing obvious then a more in depth examination of what
the processor is doing would be my next step, in particular it would be
interesting to know how it's handling the RS232 interfacing just in case it's
a comms issue.
Given that Didier's code is freely available, and the processor board
schematic is easily traced, it shouldn't be too difficult as a last resort just
to build a replacement.
regards
Nigel
GMPZR
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