Electronics > Repair
Tektronix TDS3BAT rebuild
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Dave Wise:
Thanks for the pictures!

We see that Tek OEMed the board from PowerStream Technology in 1998.
The 50WQ04 is a schottky power rectifier
The 4435's are FDS4435 30V 9A P-channel power mosfets
The M50P03 is a 50A N-channel power mosfet
The FZT789 is a PNP power BJT
No inductors so no switching power supply, I bet that the big mosfet
and/or the BJT are wired as linear pass elements with the PIC pulsing them
to limit power dissipation.
You are correct that the PIC16C54A in plastic package is OTP, so we aren't
going to be changing the program or even seeing it.

One thing that is still easy is to insert an ammeter and measure the
current at full charge.  It might be small enough that your cells
can tolerate it.
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