I recently turboed my TI-86. I desoldered C13, and in its place put
47 pF's worth of capacitors (three in parallel) in series with a
submini slide switch. That worked perfectly. To provide power during
testing, I soldered wires to the battery connectors on the PCB. All
worked well until the wires came loose from the power supply. When I
put them back in, I did it backwards. 4.5 volts (max. current 300 mA)
hit my calc at reverse polarity. Now it is completely dead (even with
batteries). Yes, I checked the contrast. Anyone have any ideas?
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