Like New Nautilus Exercise Bike has Dead Panel

[budm]

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.
GH16D is the fixed 3.3V regulator so pin 1 is GND, if it is adjustable type then pin1 will be ADJ, you have 3.3V fixed so pin 1 is GND.
Hopefully the circuit will not not be damaged when it is fed by >7V instead of 3.3V.

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

sorry my mistake it is the h package thats why i got you too measure the top tab to confirm 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.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

i would replace this voltage regulator just get the correct package type.h2 package if im correct?

Just to clarify for the part I need to order, H2 in the diagram below has ground on center pin. However, I'm getting output voltage reading on center pin and the larger oblong connection point on the top of the chip as indicated earlier in reply in post #66. Both those pins are reading 7.2v. The pin one (left pin in my pic in Post #62 above) is reading 0.7v and I'm considering that ground.

All to say, I believe I need to order the "H package" as indicated in the pic below.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

AZ1117CH-3.3TRG1 Marking GH16D this should be a 3.3 volt regulator

I've already ordered the part. Here's what I've ordered, if you or anyone can confirm this is the correct part I'd appreciate it (before it ships):

AZ1117CH-3.3TRG1DICT-ND
AZ1117CH-3.3TRG1

Pin one should be connected to ground which would be that checker board pattered trace

By "Pin 1" you mean the pin on the left as in my pic in Post #62 of RG1 above, correct? That's the one I'm getting 0.7v reading on.

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.

"to the output trace" is where on the board in refrerence to the image I posted (Post #62) of RG1 above?

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

Exactly. Yes.

i would replace this voltage regulator just get the correct package type.h package if im correct?

[R_J]

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.

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

the top oblong tab above those pins do you get 7.2v on that too?

Exactly. Yes.

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

the top oblong tab above those pins do you get 7.2v on that too?

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

dosnt look like ground put your black probe on ground what voltage do you get on the tab?

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)

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

dosnt look like ground put your black probe on ground what voltage do you get on the tab?

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

is it a h or h2 sot 223 package as pin layout is different one the top tab goes too ground the other one dosnt

GH16D 4266J2

[vinceroger69]

Re: Like New Nautilus Exercise Bike has Dead Panel

is it a h or h2 sot 223 package as pin layout is different one the top tab goes too ground the other one dosnt as its a v out pin

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Again the 0.7V on that regulator is the output voltage, not GND! Middle pin is GND! It is just that the regulator is bad and dumps the input voltage to GND

I was just going by this chart in the PDF that was referenced. In these shots, ground is pin 1 left, am I mis-reading? Just trying to learn as I go:

[CapLeaker]

Re: Like New Nautilus Exercise Bike has Dead Panel

Let us know the outcome!

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Yes, this is correct you need the 3.3V one, GH16D tells you that. I figured that this regulator should get a bit warm... lol. Replace it! Again the 0.7V on that regulator is the output voltage, not GND! Middle pin is GND! It is just that the regulator is bad and dumps the input voltage to GND.

You need a lot of heat (a good soldering iron or hot air) flux and solder to get this regulator of the PCB.

The other 2 regulators are 5V

Thanks. I'll be having these soldered on by a friend who can do it. I'll practice on lesser projects.

[CapLeaker]

Re: Like New Nautilus Exercise Bike has Dead Panel

Yes, this is correct you need the 3.3V one, GH16D tells you that. I figured that this regulator should get a bit warm... lol. Replace it! Again the 0.7V on that regulator is the output voltage, not GND! Middle pin is GND! It is just that the regulator is bad and dumps the input voltage to GND.

You need a lot of heat (a good soldering iron or hot air) flux and solder to get this regulator of the PCB.

The other 2 regulators are 5V

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

You need the 3.3V one.

OK, can you let me know how I should know whether its 3.3v or not? I was thinking 5volt.

I'm going to go ahead and order backups for the two 3940M3 chips while I'm at it - I'm already paying $4 bucks for shipping. What voltage are those?

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

Depending on your soldering skills, yes RG2 can be replaced. As for me, I'd have no problem changing that (I do have a hot air rework station). It could be the cause for the dead panel, yes. Could be also that there is more broken. However, fix that what you know is broken first. In this case a new GH16D LDO.
Here: https://www.digikey.ca/products/en?keywords=AZ1117C
they have over 20.000 in stock. You need the 3.3V one.

Thanks! So, this one, correct?

https://www.digikey.ca/product-detai...ICT-ND/4505206

[vestaviascott]

Re: Like New Nautilus Exercise Bike has Dead Panel

...The GH16D LDO should have 3.3V output and you have something like 0.8V the rest goes to GND.

The readings in Post #51 are accurate. Please disregard all prior readings:

For RG1 (GH16D), voltages are from left to right:
0.7 (left pin - GND)
7.2 (middle pin - Vout) * I measured this several times b/c I was expecting 5 V
8.7 (right pin - Vin)

The input voltage is sagging a bit due to this. So this LDO is bad. Does this regulator get a bit warm?

Yes, after about a minute of the device being plugged in, this regulator is extremely hot compared to the others.

[CapLeaker]

Re: Like New Nautilus Exercise Bike has Dead Panel

Depending on your soldering skills, yes RG2 can be replaced. As for me, I'd have no problem changing that (I do have a hot air rework station). It could be the cause for the dead panel, yes. Could be also that there is more broken. However, fix that what you know is broken first. In this case a new GH16D LDO.
Here: https://www.digikey.ca/products/en?keywords=AZ1117C
they have over 20.000 in stock. You need the 3.3V one.