Hi, I am hoping for some help.
I am new to all of this.
I have started with a Pi and Ian Canada stuff. Fifopi, Transporter Pi and also a Khadas Tone Board (KTB)
I got a second hand Ian Canada LifePO4 LPSU.
I have had some trouble making it all work and assumed it was my inexperience, but have realised that the LPSU might not be right, so turned my attention to that.
The symptoms seemed to keep changing.
One of the things is that if I power the KTB from the 5v usb the music is crackly.
But if I power it from an old phone charger, it is fine.
I started off using the 3.3v rail J2 as it seemed to be a better source.
But it has deteriorated. It now jumps about and gives between 0 and 2.98v
Then the whole thing would shutdown almost straight away if I used it saying 'short protection'
However, in the manual it says:
In which conditions the power supply will turn off automatically
(1). If run time is up, the power supply will turn off automatically to prevent battery form possible over discharge.
(2). If any output voltage at J1 or J2 is lower than 3.3V, the power supply will turn off automatically to prevent
battery form over discharge.
(3). If there is short circuit to J1 or J2 output, or the output current is too high, the power supply will go back to
power off shortly after it was turned on.
So I assume it is down to it not giving 3.3v
Also, All but two cells give 3.65v when I test them in situ.
Apart from two. One gives 3.51v and another 2.98v
Oh, another thing. The 3.3v rail J1 gives 3.65v is that normal?
Shouldn't it be 3.3v?
Sorry it is so long, but I am not sure where to start.
Thanks.
I am new to all of this.
I have started with a Pi and Ian Canada stuff. Fifopi, Transporter Pi and also a Khadas Tone Board (KTB)
I got a second hand Ian Canada LifePO4 LPSU.
I have had some trouble making it all work and assumed it was my inexperience, but have realised that the LPSU might not be right, so turned my attention to that.
The symptoms seemed to keep changing.
One of the things is that if I power the KTB from the 5v usb the music is crackly.
But if I power it from an old phone charger, it is fine.
I started off using the 3.3v rail J2 as it seemed to be a better source.
But it has deteriorated. It now jumps about and gives between 0 and 2.98v
Then the whole thing would shutdown almost straight away if I used it saying 'short protection'
However, in the manual it says:
In which conditions the power supply will turn off automatically
(1). If run time is up, the power supply will turn off automatically to prevent battery form possible over discharge.
(2). If any output voltage at J1 or J2 is lower than 3.3V, the power supply will turn off automatically to prevent
battery form over discharge.
(3). If there is short circuit to J1 or J2 output, or the output current is too high, the power supply will go back to
power off shortly after it was turned on.
So I assume it is down to it not giving 3.3v
Also, All but two cells give 3.65v when I test them in situ.
Apart from two. One gives 3.51v and another 2.98v
Oh, another thing. The 3.3v rail J1 gives 3.65v is that normal?
Shouldn't it be 3.3v?
Sorry it is so long, but I am not sure where to start.
Thanks.
Update.
Now it is going to short protection with nothing plugged into it.
Up to the other day it would run fine if I wasn't using J2.
Oh, and its run time had dropped right down.
Before it would run the four or five hours until it shuts down for 'low bat protection'
But last time I ran it, it was down to half an hour before 'low bat protection'.
Now it shuts down after a few seconds with 'short protection'
Now it is going to short protection with nothing plugged into it.
Up to the other day it would run fine if I wasn't using J2.
Oh, and its run time had dropped right down.
Before it would run the four or five hours until it shuts down for 'low bat protection'
But last time I ran it, it was down to half an hour before 'low bat protection'.
Now it shuts down after a few seconds with 'short protection'
I have had a look at it with an untrained eye.
One of the diodes soldering looks poor. It seems to be bridging.
Does that matter? Or is it just a tidy thing in this case?
One of the caps appears to be beginning to bulge.
Some of the soldering doesn't look great (not sure that i am any better mind)
Thanks for looking.
One of the diodes soldering looks poor. It seems to be bridging.
Does that matter? Or is it just a tidy thing in this case?
One of the caps appears to be beginning to bulge.
Some of the soldering doesn't look great (not sure that i am any better mind)
Thanks for looking.