Tryout..
plug it in, and experiment what sgements go on or off. with the turbo boton on and off.
its a question of tring ans error aproach

nuno14272 wrote on Today, 09:16:

Tryout..
plug it in, and experiment what sgements go on or off. with the turbo boton on and off.
its a question of tring ans error aproach

Sorry but you could at least read literally only 3 sentences of text before basically telling me not to bother you with my question.

I said I do not know where to plug the turbo switch connector and power connector for this, so naturally I do not want to just plug the +5V and GND cables needed for everything just anywhere and potentially fry any segments.

Once I know where the +5V/GND connector and turbo switch connector (from the turbo button, to toggle between states) go, I can do what you suggested without risking any damage.

Until then, it would be to dangerous!

The two pins next to the white jumper should be power input. I'm not sure which is GND and which is 5V, but 5V should be one that connects to the resistor, perhaps the rightmost pin. Turbo on/off are the 3 other pins, with jumper over one pair to lock it to one of the states.

The rest is done by T shaped arrangement seen in most other MHz displays with each T section controlling one LED segment. Exact correspondences are found by trial and error. There should be many lit segments, and actual danger is to take off all jumpers and then start finding out what each segment is. That first segment will be really bright and can noticably dim during the trying period like that...

Pretty much all the known turbo displays are documented here

https://www.minuszerodegrees.net/led_speed_di … eed_display.htm

None of the models match the layout of yours, although from the jumpers you can see it's similar to the up-down tetris T-block arrangement like the S-501.

It seems like the Vcc, GND and TB pins will need to be reverse engineered from the traces.

NorsteinB wrote on Today, 09:43:

Sorry but you could at least read literally only 3 sentences of text before basically telling me not to bother you with my quest […]
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nuno14272 wrote on Today, 09:16:

Tryout..
plug it in, and experiment what sgements go on or off. with the turbo boton on and off.
its a question of tring ans error aproach

Sorry but you could at least read literally only 3 sentences of text before basically telling me not to bother you with my question.

I said I do not know where to plug the turbo switch connector and power connector for this, so naturally I do not want to just plug the +5V and GND cables needed for everything just anywhere and potentially fry any segments.

Once I know where the +5V/GND connector and turbo switch connector (from the turbo button, to toggle between states) go, I can do what you suggested without risking any damage.

Until then, it would be to dangerous!

NeoG_ wrote on Today, 09:53:

It seems like the Vcc, GND and TB pins will need to be reverse engineered from the traces.

Yeah, that's the problem here. I do not have the education to do this.

Thank you for a pointer where to look, though.

NorsteinB wrote on Today, 09:43:

I said I do not know where to plug the turbo switch connector and power connector for this, so naturally I do not want to just plug the +5V and GND cables needed for everything just anywhere ant potentially fry any segments.

My guess is: In the row with the white jumper cap, from left to right:
1: Low from turbo switch
2: Common from turbo switch
3: High from turbo switch
4: Ground
5: +5 Volt

You can try powering it with a CR2032 battery on the pins to the left of the white jumper cap. A CR2032 battery has just enough power to light a LED, but not nearly enough power to damage anything on the board. Here with multiple LEDS and a series resistor it will light the LEDs very dim.

Dorunkāku wrote on 29 minutes ago:

My guess is: In the row with the white jumper cap, from left to right: 1: Low from turbo switch 2: Common from turbo switch 3: H […]
Show full quote

NorsteinB wrote on Today, 09:43:

I said I do not know where to plug the turbo switch connector and power connector for this, so naturally I do not want to just plug the +5V and GND cables needed for everything just anywhere ant potentially fry any segments.

My guess is: In the row with the white jumper cap, from left to right:
1: Low from turbo switch
2: Common from turbo switch
3: High from turbo switch
4: Ground
5: +5 Volt

You can try powering it with a CR2032 battery on the pins to the left of the white jumper cap. A CR2032 battery has just enough power to light a LED, but not nearly enough power to damage anything on the board. Here with multiple LEDS and a series resistor it will light the LEDs very dim.

Thank you! I will try just that in the evening and report back. Maybe someone else in the future will have the same question.