flat-earther
Senior Member
Last Activity: Today, 11:45 PM
Joined: 12-20-2022
Location: palestine
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Alright, I have an 0603 resistor kit on the way. -
D1 diode soldered back.
Inductor repaired. I bent the copper wire down and soldered it to the pad.
[URL=filedata/fetch?id=3655525&d=1749474246][ATTACH=JSON]{"alt":"Click image for larger version Name:\tIMG_3253.jpg Views:\t0 Size:\t1.36 MB ID:\t3655525","data-align":"none","data-attachmentid":"3655525","data-size":"thumb"}[/ATTACH][/URL] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3655528}[/ATTACH]D1 diode soldered...Leave a comment:
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I removed the diode D1, in diode mode it measures 0.575V one way, OL other way.
In resistance mode 68kOhm one way, OL other.Leave a comment:
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I tested all ceramic caps, didn't find any shorted. Ceramic cap C9 near motor wires is about 1 Ohm but the motor wires are soldered there so I think that's just the motor resistance.
All power disconnected, I measured in diode mode diode D1, 0.663V one way, 0.571V the other way. Is that okay?
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3655260}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3655261}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3655262}[/ATTACH]...Leave a comment:
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All power disconnected, measuring Z5 in diode mode, OL one way, 0.725V the other way.Leave a comment:
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Disconnected all power from board, D13 in diode mode is open line one way and 0.217V the other way.
BTW while the inductor is essentially disconnected is there anything I should test in this state before reconnecting it?Leave a comment:
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Well removing that glue was extremely difficult. I used a 25W iron with sharp tip to pick it, then tweezers, and I destroyed the inductor by accidentally pulling the copper wire along with the glue with tweezers and the wire snapped.
I will need to try and resolder that wire back but it's so short I'm not confident in it, if that doesn't work I may unwind it one rotation to make it longer. I hope I didn't short the winding by scratching it with the tweezers.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654953}[/ATTACH]...Leave a comment:
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Just to experiment, I have set an external power supply to 26V because that way I can see current draw on the power supply.
When I plug that power supply to the vacuum I see a very brief about 1A current draw and then it instantly drops to zero.Leave a comment:
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BTW I have manually charged the cells with an external charger so they wouldn't be empty. Right now the battery is at 24V.
How do you want me to check D13?Leave a comment:
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With the charger plugged in, black probe on ground, measuring voltage at input of the charging mosfet, I see it's constantly jumping between 27.5 and up to even 27.88V:
[URL=filedata/fetch?id=3654824&d=1749386209][ATTACH=JSON]{"alt":"Click image for larger version Name:\timage.png Views:\t0 Size:\t1.26 MB ID:\t3654824","data-align":"none","data-attachmentid":"3654824","data-size":"thumb"}[/ATTACH][/URL]
At the mosfet's output the voltage is constantly jumping between 7.6 and 8V:
[URL=filedata/fetch?id=3654825&d=1749386269][ATTACH=JSON]{"alt":"Click...Leave a comment:
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Thanks.
My bad, that white is residue from when I cleaned the board with alcohol and didn't dry it well. I wiped it clean now, here's some new photos.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654808}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654807}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654806}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654805}[/ATTACH]...Leave a comment:
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Adding a clock battery to action camera to retain date&time when changing batteries Campark X25
I have a cheap action camera with an annoying trait, every time I change batteries the date & time gets reset and I have to set it again.
To solve this problem I want to add a small internal battery inside it which will keep supplying power to the camera for a while while I change batteries so the date & time is retained.
I have opened the camera and I think there is enough room to add something inside to accomplish this:
[URL=filedata/fetch?filedataid=387321][ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3654673}[/ATTACH][/URL]... -
Hoover FM216LI cordless vacuum refuses to charge
I have a Hoover FM216LI cordless vacuum which isn't charging its internal battery.
I opened up the unit, and it has 6x Samsung ICR18650-22P cells connected in series.
5 cells were at about 3.3-3.1V. one was at 2.4V, so I assumed this cell was bad that's why the vacuum wasn't charging so I replaced it with another 18650, but after that the problem still persists, the vacuum turns on a bit and then cuts out since the batteries are empty.
So I think the over discharged battery wasn't the culprit, it was a symptom of the unit not being able to charge its batteries.... -
The 16V bipolar junction transistor is NPN, and the 32V transistor is PNP.
On both measuring in diode mode between base and emitter in one direction is about 0.6V and OL in the other direction.Leave a comment:
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Any suggestions on what to check on the board?Leave a comment:
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Can anyone suggest how else to troubleshoot this board?Leave a comment:
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Alright thanks....Leave a comment:
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I plugged the power cable into the motherboard.
I found that the 32V from the cable gets through a mosfet and successfully gets to the print head connector(see photo), so looks to me that the motherboard is receiving the 32V normally.
But then I found another mosfet that receives the 16V to its center pin(see photo), but the 16V doesn't pass through the mosfet when I measure its output pin(see photo).
Could that be the problem, that the motherboard isn't receiving the 16V?
Is it a broken mosfet, or something not allowing the mosfet to turn on? or what's going...Leave a comment:
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I have finally removed the motherboard.
I will attach photos of it.
Can anyone advise me how to troubleshoot it?Leave a comment:
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I found a photo of similar motherboard online, I labeled the connectors, maybe it's helpful for anyone.Leave a comment:
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