Like New Nautilus Exercise Bike has Dead Panel

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

See if you can get spec sheet of that regulator.

Will do. P/N is IR50

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

See if you can get spec sheet of that regulator.
BTW, Did you remove RG1 from the board already? If you did, check the resistance both way between input pin and the output pin to see what you have on that RG1.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

BTW:
1) I see another 5-PIN regulator IC RGP1 close to UP1, UP2 IC's.

Ah, I see that now. Thanks. I'll run voltage tests on that one in the am.

2) Can I also see the pictures of the whole back side of the board.

Will do.

3) Check the resistance between the big solder pad of RG1 and the positive (marked with bar) pin of cap C20.

OK, will do.

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

BTW:
1) I see another 5-PIN regulator IC RGP1 close to UP1, UP2 IC's.
2) Can I also see the pictures of the whole back side of the board.
3) Check the resistance between the big solder pad of RG1 and the positive (marked with bar) pin of cap C20.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Trace (visually) where the output goes. If it supplies power to any "chips", chances are, they are also toast as you've supplied 7.2V to their power pins

Here is the closeup shot of the chip and its surrounding trace pattern:



The output pin (middle) does not appear to be connected to anything from this view. Do I have to remove the board and turn it over to see where this center pin leads?

And here is the full hi resolution shot:

[Curious.George]

Re: Like New Nautilus Exercise Bike has Dead Panel

0.7v on pin 1
7.2v (middle pin - Vout) * I measured this several times b/c I was expecting 5v (turns out it should actually be 3.3v)
8.7v (right pin - Vin)

Trace (visually) where the output goes. If it supplies power to any "chips", chances are, they are also toast as you've supplied 7.2V to their power pins (usually not able to withstand more than 10% over). If in doubt, you can look up the datasheets on those components (ax voltage on power pin), as well.

I.e., don't waste your time fixing the regulator if that's just going to tell you that everything downstream is toast.

You can also try removing the regulator and probing the signal on the PCB in its absence. I.e., has something else imposed 7.2V on its output or was it the sole source? (replacing the regulator in the case of some other superimposed signal will just toast the new regulator in an ohnosecond).

[CapLeaker]

Re: Like New Nautilus Exercise Bike has Dead Panel

AZ1117CH-3.3TRG1 Marking GH16D this should be a 3.3 volt regulator
Pin one should be connected to ground which would be that checker board pattered trace

You could remove the regulator and supply 3 volts to the output trace from a power supply or 3v battery and see if it powers up, likely if you have 7 volts there now, other parts down the line could be damaged.

AZ1117CH-3.3TRG1 = GH16D
The H in xxx7CH means H package. Sez so in the datasheet.

[R_J]

Re: Like New Nautilus Exercise Bike has Dead Panel

You could also try two 1.5 volt AA or AAA batteries in series, most people have them around. or maybe even a CR2025 3 volt cell might have enough current to check the circuit

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

For now you can try using two NEW AA batteries connected in series to give around 3V to see if you will get any action on main board.

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

yes i use a old laptop charger for output voltages under 19v i have a old 30vdc printer psu for voltages over 19v

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

This is what i use for testing
https://www.ebay.co.uk/itm/DC-6-40V-...72.m2749.l2649

The input has to be a DC source?

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

This is what i use for testing
https://www.ebay.co.uk/itm/DC-6-40V-...72.m2749.l2649

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

old computer psu if you dont have a bench psu handy i was going too suggest two aa batteries but not sure if enough voltage?

This work?

https://www.amazon.com/GEREE-Adjusta.../dp/B019YXLWZA



Or perhaps this since the first one above apparently is not able to support less than 4 volts on the LED readout:
https://www.amazon.com/DROK-180057-C.../dp/B019RKVMKU

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Check the resistance between pin1 (left pin) and GND pin that I told you to use to see what resistance you get.

Hi Bud, thanks for all the helpful info! Can you let me know what I should infer from the resistance measure below?

Resistance between GND reference point on lower board and Pin 1 of RG1 is 0.3

Is that expected?

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

old computer psu if you dont have a bench psu handy i was going too suggest two aa batteries but not sure if enough voltage?

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

You have H package not H2, so put 3.3V power supply negative to circuit GND, + to where the big tab is

OK, next question is where would you guys suggest I may be able to get a power supply that outputs variable power settings (one of those being 3.3 volts)? Harbor Freight? I have a 25% off coupon if so, lol.

You should try to turn on both power supplies at the same time.
BTW, it may or may not run at 3V.

So, plugin the bike's power adapter and also apply 3.3v to this RG1's +trace location?

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

You have H package not H2, so put 3.3V power supply negative to circuit GND, + to where the big tab is. You should try to turn on both power supplies at the same time.
BTW, it may or may not run at 3V.

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

output pin 3v positive, negitive on ground im sure budm will confirm.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

...in the meantime like r_j suggests maybe remove the old part use a 3v supply that way if you have other faulty parts you can place just one order.

I'd like to do that, yes. I'm just not sure how and where to connect a 3v supply to the board where I remove the part.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Check the resistance between pin1 (left pin) and GND pin that I told you to use to see what resistance you get.

Resistance between GND reference point on lower board and Pin 1 of RG1 is 0.3

Is that expected?