Electronics > Repair

TDS3014 adventures

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sicco:
lern01, I don’t know.
Maybe your DS1742W is dead now because you gave it 5V as VCC. The -W suffix means it’s a 3.3V device…
Maybe it survives that 5V, but does not accept writes when VCC is as high as 5V.
Possibly with a really dead lithium batter inside it does not power the RAM area, despite having VCC of 3 or 5 volts. Cut your way into the DS1742W, from the top, from the pin 12 pin 13 side, find and disconnect the old coin cell inside, and wire a fresh 3V to what used to go to the old battery +. Battery - to GND on pin 12 of the DS1742W,
Maybe it then works again. Maybe not….

The C code that i shared is from the BDM backdoor into the TDS3000. Shared to illustrate what DS1742W memory bytes contain engine hours, mac addrress etc. That code will never run on the sort of programmer that you now use.

Jarek:
I have a tds3014b, it stops at the start screen.
NVRAM is good.
I thought it was a ROM. I desoldered and read these memories. I am attaching the files, maybe they will be useful to someone.
I programmed new ones using other files from the forum.
Nothing has changed. I'm still looking for the fault.

sicco:
What does it say on the serial engineering port?
https://groups.io/g/TekScopes/topic/tektronix_tds3034b_boot/104242499?p=,,,20,0,0,0::recentpostdate/sticky,,,20,0,0,104242499,previd%3D1707443608543731339,nextid%3D1707015820604178330&previd=1707443608543731339&nextid=1707015820604178330

Jarek:
Thank you Sicco for your suggestion.
I read all your posts, you did an amazing job.
I have a TDS3GV card only , I'm ordering the FT4232 controller board and will try to read the serial port.

Jarek:
Does anyone know if pin 18 of DS1742W (CE)
is connected to one of the pins of the 100-pin connector,
if so, with which one?

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