Cyberpower CP900EPFCLCD - F03 Error

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Check this fuse.

Done! I checked with the multimeter in continuity, and is showing OL, and it is not beeping. That means it doesn't have continuity, right?

[lotas]

Re: Cyberpower CP900EPFCLCD - F03 Error

Check this fuse.

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

You should have a high DC voltage on C3 - 400 V 10 uF, if it is not there, then the AC voltage does not reach the diode bridge, you need to check the fuse or low-resistance resistor, or the relay between the AC 220v input and the diode bridge did not work.

Alright, I checked the values for the BD1 component:
input AC: 0.310V
output DC: 0.403V

I also checked the cable that comes from the input AC cable (after the fuse) to see if the current was getting into the board. It has 233V, so it seems that at least until that point the current is as expected.

Using the attached picture Cyberpower04.jpg, where should I measure and which values should I expect? If you could pin-point in the picture, it will be even better, as I am a total beginner.

By the way, I always connect the battery for the tests

[lotas]

Re: Cyberpower CP900EPFCLCD - F03 Error

And some more UPSs will not start (they will not turn on the relay to start the switching power supply) without a battery, you need to check the power with the battery.

[Per Hansson]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes, could also be that the bridge rectifier BD1 is broken, so check if you have input AC voltage on it.

[lotas]

Re: Cyberpower CP900EPFCLCD - F03 Error

You should have a high DC voltage on C3 - 400 V 10 uF, if it is not there, then the AC voltage does not reach the diode bridge, you need to check the fuse or low-resistance resistor, or the relay between the AC 220v input and the diode bridge did not work.

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes exactly, start there and then we can look at the rest.

I took the measures for the three capacitors. These are the values I obtained:

C3 - 400V 10uF ---> 0.403V
C14 - 50V 47uF ---> 0.184V
C17 - 25V 470uF ---> 0.939V

I haven't replaced the 550Ω resistor yet, though. Not sure if this point can affect the taken measures.

I attached a couple more pictures in case they help.

[lotas]

Re: Cyberpower CP900EPFCLCD - F03 Error

If the switching power supply works, then voltage should appear on this capacitor.

[Per Hansson]

Re: Cyberpower CP900EPFCLCD - F03 Error

Can I use the multimeter directly over these caps while working? I mean, should I get the 50 or 400V on them? I never did this, so it is difficult for me.

Yes exactly, start there and then we can look at the rest.

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes, it is clear that the 550 Om resistor has a burnout.

I will try replacing it.

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes proper standby charge voltage for a lead acid battery is around 13.7v and charge voltage is around 14.7v
Now that you replaced the Viper have you checked what voltages you have on the capacitors you replaced, so we are sure that it is working at all?

Can I use the multimeter directly over these caps while working? I mean, should I get the 50 or 400V on them? I never did this, so it is difficult for me.

I notice in your first picture some soot around component U7.
I think it is a ST 324 op-amp that is probably used in the charge control circuit.
Hard to know without a circuit diagram of course.

Yes, I also noticed the burnt marks, but I thought it was from the cap or the viper when it poofed. I checked continuity on the components on top of the U7, but I am not sure how to test the U7 itself.

I attached a picture where I highlighted a possibly bad solder joint for a through hole component.

I can desold and resold it just in case.

I also would not exclude the 550Ω resistor or the optocpupler U3 since they are in the path of destruction too...

I thought about replacing the 550Ω resistor, but I thought it was ok. I can replace it as I have some spares. Regarding the optocupler, how can I check it? I will try to find this part somewhere.

[lotas]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes, it is clear that the 550 Om resistor has a burnout.

[Per Hansson]

Re: Cyberpower CP900EPFCLCD - F03 Error

Yes proper standby charge voltage for a lead acid battery is around 13.7v and charge voltage is around 14.7v
Now that you replaced the Viper have you checked what voltages you have on the capacitors you replaced, so we are sure that it is working at all?

I notice in your first picture some soot around component U7.
I think it is a ST 324 op-amp that is probably used in the charge control circuit.
Hard to know without a circuit diagram of course.

I attached a picture where I highlighted a possibly bad solder joint for a through hole component.

I also would not exclude the 550Ω resistor or the optocpupler U3 since they are in the path of destruction too...

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Guys, forget about what I said previously. I just got the dreaded F03 error again. I checked the battery, and it was around 10.29V, so I have the impression that for the latest 3 days, the battery has been discharging without realizing it....
this only means that even that I swapped all the broken components, there is still something wrong with the board. Now I have no idea how to track the error and what can I do to fix it.... T_T
Any suggestions will be really appreciated.

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

@Shinjinkun

Very nice soldering on your board.

Have you tested the UPS yet?

@pete_c I finished with the fix a couple of days ago, but I was using it in case I got the F03 error again. It doesn't look like it is the case though. So far is working great.

Big thanks to @momaka for the suggestions of components. It seems that they were spot on.

In the end I swapped both caps (the 50V and the 400V). About the Viper22a, I added an extra socket in case I have to change it in the future, but I hope it won't be needed.

You can see the pictures with the final board components. I was using the multimeter to check that the voltage of the battery was within normal values. It is curious that this UPS doesn't overcharge the battery as some off-line ones that I own. The others charge the battery at 13.5V, but this one seems to only use 12.5V instead. The reason is probably the better design and components, but who knows...

Again, thanks to all for your help. It is really appreciated.

Regards

[pete_c]

Re: Cyberpower CP900EPFCLCD - F03 Error

@Shinjinkun

Very nice soldering on your board.

Have you tested the UPS yet?

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

So have you tried to power up this switching power supply yet to see if you fix it or not

No, I haven't yet, as I didn't complete all the soldering. I am waiting to get a socket for the integrated, so once I receive it, I will complete the final piece. I attached the picture of the current motherboard after soldering most of the components.

I will show you the final pictures and tell you if it works or not once it's complete.

Thanks!

[sam_sam_sam]

Re: Cyberpower CP900EPFCLCD - F03 Error

So have you tried to power up this switching power supply yet to see if you fix it or not

[Shinjinkun]

Re: Cyberpower CP900EPFCLCD - F03 Error

Hi guys!
Finally, I got all the components needed to reattach.
As you can see in the attached picture, I got:
Viper22a integrated
Capacitor 400V 10uF
Capacitor 50V 47uF
Diode S1G
Capacitor SMD 470pF
Zener Diode MELF 39V

I already removed all the components.
I checked the 50V cap, but I found that it was fine... anyway, I will put a new one.
About the 551 resistor, I don't think I need to change it.
Do you have any suggestion to resold everything back?
Is there any test I should perform after having everything in place?
Thanks again!

[sam_sam_sam]

Re: Cyberpower CP900EPFCLCD - F03 Error

One last comment, in case the SMD resistor 551 break or something, also got a resistor kit but, the kit only contains a 560 OHM, instead of the 550 OHM that the 551 should have. Because they have a 5% tolerance, I suppose it should work too...

I will let you know once I receive all the components. Thanks again!

It should work