Like New Nautilus Exercise Bike has Dead Panel

[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

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

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

[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.

[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

[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.

[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).

[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:

[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

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

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

See if you can get spec sheet of that regulator.

Will do. P/N is IR50

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

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.

Have not. Have to get a soldering iron or bring it to a buddy who has one (and knows how to use it, lol)

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

That is all it has printed on the top, IR50?

[budm]

Re: Like New Nautilus Exercise Bike has Dead Panel

Have not. Have to get a soldering iron or bring it to a buddy who has one (and knows how to use it, lol)

You can go ahead and check the resistance with it in place for now, I ma just curious as to what it will show resistance wise.
It will be a lot easier to remove the IC if you cut the two small legs first, the to remove the big tab you will add flux and more solder to it. You will need 45W iron with wide tip because that cooper plane will suck the heat from your solder tip if you use low Wattage iron.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

That is all it has printed on the top, IR50?

Closeup shot is below. There is what appears to be a vertical bar or line, followed by "R50" so "|R50"

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

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

That pin on C20 is almost too tiny to hit, but when I can, I'm getting 0.6 to 0.7 ohms resistance.

[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

Left and right pins measure 8.8v, middle pin measures 0.7v

Question:
These pins are SUPER small and VERY close to one another, if I happen to accidentally bridge two pins with my test lead while measuring voltage, does that likely fry/short the component?

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

Left and right pins measure 8.8v, middle pin measures 0.7v

Question:
These pins are SUPER small and VERY close to one another, if I happen to accidentally bridge two pins with my test lead while measuring voltage, does that likely fry/short the component?

do the top two pins read any voltage? and yes shorting pins can cause damage so just be careful if you can see where the trace from the pin goes too you can measure on the end of say a resistor or capacitor the side closest to the pin you want too measure saves shorting too the next pin by accident

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

do the top two pins read any voltage?

Yes, one pin measures 1.2v, the other 4.99v