[time-nuts] fluke.l monitor for Thunderbolt
golgarfrincham at yahoo.com
Mon Jun 6 22:03:24 UTC 2011
"Mine stopped the same way. I gently spread the boards apart and
unsoldered the 3 pin regulator then added a Red-LED in place of the
three links (Original circuit had three diodes) and my monitor starting
working again. So it may be recoverable.
I agree with this as a good fix and posted this back in April.
" What I have done with the displays I got from Fluke.L is lift the end of the
interface board and hold it away from the display board just enough so I
can heat and remove the 5 volt regulator and replace it with a jumper. It
might be a little easier to just lift the input and output leads off their
solder pads and leave the chip there but I removed the chip as well. I'm
supplying the display with a regulated 5 volts so removing the regulator
from the display assembly eliminates one of the possible problem area
by removing one of the heat sources from the board. Some people have
had problems with the regulator shutting down if they supplied it with 12
volts and the chip went into thermal shutdown.
Next I remove the 3 zero ohm resistors (that are where the 3 diodes should
have been installed to drop the 5 volts to ~3.3 volts for the CPU) and replace
them with a red LED with leads long enough so it can be on the back side of
the interface board because there wasn't enough room between the boards for
the LED I am using. I have some SMD red LEDs but decided they might be
too hard to solder between the two boards. The red LED makes a pretty good
~1.7 volt zener diode so now I have the display powered by 5 volts and the
CPU powered by ~3.3 volts which makes it happy."
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