Re: Cyberpower CP900EPFCLCD - F03 Error
Where should I make the measures? I attached the pictures of the pcb after removing the transformer to point it out....
Shinjinkun
Member
Last Activity: 09-02-2022, 05:07 AM
Joined: 03-16-2022
Location: Altea
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Re: Cyberpower CP900EPFCLCD - F03 Error
Yes, that's what I thought. I thought maybe the transformer was responsible for the short, but it doesn't look like it.
I haven't connected the PCB after removing the transformer, as I wasn't sure if I could do it or not... should I?
I am still concerned with the two components which we didn't have the value, the capacitor and the zener diode... I am using a 470pF smd capacitor and a 39V zener... could it have some relation with the short, or shouldn't have really anything to do with it?...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Ok, forget about the previous message.
Adding some extra solder, and moving the iron left and right, I was able to pull the transformer bit by bit, and finally removed it.
I attached the pictures of the transformer.
Then, I used the component tester with it.
If I measured between the first pin and the last one in the primary winding, I got an inductance of 11.1 mH and a resistance of 5.11Ω.
Doing the same with the secondary winding, I got 0.07 mH and a resistance of 0.16Ω.
However, when I...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Yes, I have seen those vacuum desoldering irons before, but the cheapo ones doesn't look much better than the manual I have. The ones with electric pump, obviously better, are also fairly more expensive
Regarding that low temp solder, how does it work? Have you got an Amazon or Aliexpress link I could buy from?
Thanks...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Guys, I tried removing the transformer, but somehow, I can't get all the solder out of the holes, and when I try to remove it, is still pretty hard to move. Do you have any tips to take it off? I only have a manual pump, and some solder wick....Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Hi guys! Sorry, I was off-line waiting for the devices I ordered.
Finally, I received a component tester, and also an oscilloscope (probably it will be helpful for the repair?). It is the model DSO-TC2 ([url]https://www.aliexpress.com/item/1005004216333435.html[/url])
I also bought an electronics starter kit that contains several resistors, capacitors and other components.
Then, what should be my procedure to continue with the repair? Remove the transformer and check its inductance? How do I know that the values are what...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Wow, that's a lot of info. Give me some time to digest this, please.
I just received the components kit I ordered a few days ago. I will see if I can try to replicate some of these example circuits.
It seems that there is still a long way to go... and I thought just changing the battery would fix the issue with the UPS
...
Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
In order to build the circuit, can you recommend a starter kit with base components to do all these, please? I have been checking some arduino starter kits, but it seems that the breadboard that comes with is only up to 12V, so probably it won't be useful to do those tests, right?...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Oh, I will try that. I think I am going to need a a starter kit of components, or disassemble a broken UPS I have in the garage. One question, if I removed the transformer, could I also reconnect the circuit and check if the short is still there, or should I try to avoid connecting it without all components? If I were to remove also the optocoupler and the capacitor between hot and cold sections, could I check the values? Or the circuit would be totally wasted?
Yes, I didn't know such tester existed......Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Ok, I have been reading some info, and understand that those component testers are meant to check which type of components they are and their values. However, even if I were to check the transformer inductance, how do I know that the value is correct? Or just getting a value means it is fine?
So, in the end I found a component tester and ordered it from aliexp. I should get it in few weeks I hope.
By the way, I have been doing again another search for the service manual of the ups, but so far, I was only able to find a few cyberpower...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
No, I am not sure about how to measure the transformer... I checked the link you provided, but I am not sure about what to do with this... Am I supposed to buy these components? Or is is something that can be bough as is?
I get more and more confused by the moment... T_T...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
But is there a way to check that this is happening? I mean, I only have like 5 or 6 vipers left... I won't like to completely waste them if I can avoid it...
How can I isolate the hot area to confirm that there are no shorts in the cold area?
Is there a way to confirm that the viper is working, even outside the motherboard?...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
I replaced the components, included the viper, and connected everything again. However, I am back to step one, the short is present and I cannot get a way to find which component is causing it.
Do you have any recommendation on how to proceed? I am really stuck at the moment, even after watching loads of SMPS videos and reading several datasheets.
I'd really appreciate any suggestion on what to do.
Thanks again for all your help.
...
Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
I am using this flux: [url]https://www.jbctools.com/fl-15-flux-in-bottle-15-ml-product-150.html[/url]
Not sure if it has acid or whatnot.Re: Cyberpower CP900EPFCLCD - F03 Er...id or whatnot.Re: Cyberpower CP900EPFCLCD - F03 Error
I am using this flux: [url]https://www.jbctools.com/fl-15-flux-in-bottle-15-ml-product-150.html[/url]...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Well, that must be the current issue, indeed.
I removed the bridge rectifier and, when I connected everything to mains, the light bulb was off. Then measured the voltage. This time, I was getting 230.8V into both inputs for the DB107 bridge rectifier. I suppose that means that everything before it should be working fine, right?
Ahh, understood. I didn't know that was the correct value I should get.
Alright, let's check the right part later on.
...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Sorry it took me some time to make the proper tests.
Well, I finally connected the lamp and, as expected, is continuously bright. At least, this way, is not burning the components again.
As I wasn't sure about what to do, I took several measures of voltage in different points. Please check the attached pictures.
I would like to point out a few things:
First, I found only 0.7V in the ceramic capacitor C6 (AC472M), while in C5 that is exactly the same type, found 232V....Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Hi guys!
I replaced all the components again just to be sure. When I removed the 550Ω, I checked it and it was in short, so I replaced it.
Regarding the lamp holder, I attached the contacts to the fuse, as it is open anyway. Attached the pictures for some reference.
So now, should I connect everything again and test all the components? Which steps should I follow?
Thanks...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Yes, I will use the incandescent lamp first, as it will take several days or weeks to get the fuse replacement. Problems of living in a small village. I will order the replacement as soon as possible.
I watched two or three of these videos, and it looks like the BD1 rectifier is in order.
Actually, I tested U3 again, and I get 1.082V between anode to cathode. It seems that a small circuit and a battery are needed to fully test the optocoupler, so I may have...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
I removed the fuse from the board, but it doesn't clarify much. Attached some pictures for you to see.
The markings on the fuse are like this:
RSFR-H on the self-shrinking tube.
2A 250V | in one side
TAP c UL US | on the other side
I have been looking for hours to see if I can find the same kind of fuse, but no luck so far. Do you have any idea about which one should work?...Leave a comment:
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Re: Cyberpower CP900EPFCLCD - F03 Error
Perfect. I will get a lamp holder tomorrow. I remember I have one in the garage.
Alrighty. I hope the fuse has some print on it. Otherwise, is going to be difficult to pick the fuse.
The bridge rectifier is the BD1 component (BD107G), right? I measured it, without removing from motherboard, with the negative in the AC inputs, and was getting 0.595V in diode mode. The same putting the negative in the positive DC, so I am not sure if this means it works....Leave a comment:
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