A friend gave me this ups, problem is that it charges battery but doesn't convert 12V to 220V, I tested all transistors, diodes, mosfets, relays and everything seems fine.
UPS uses VIPER22A chip which while ups is connected to 220V source has 10V on VDD pin (4), but when disconected from the wall VIPER looses voltage and ups dies.
Some symptons so far:
With only 220V input UPS wont turn on.
Without battery ups just clicks and doesn't turn on the screen.
With battery it turns on and beeps only, no output.
With battery and 220V input it works and produces output 220V.
When 220V input is disconected UPS beeps and doesnt produce 220V output.
When ups is working it shows battery voltage 0V and capacity 0%
So, is there a way to test this chip, should it produce output all the time while there is a 10V on VDD pin and some current on FB pin, or doest it start outputing when it senses power loss?
Does anyone has a schematic for this ups, CyberPower 1200E-B?
UPS uses VIPER22A chip which while ups is connected to 220V source has 10V on VDD pin (4), but when disconected from the wall VIPER looses voltage and ups dies.
Some symptons so far:
With only 220V input UPS wont turn on.
Without battery ups just clicks and doesn't turn on the screen.
With battery it turns on and beeps only, no output.
With battery and 220V input it works and produces output 220V.
When 220V input is disconected UPS beeps and doesnt produce 220V output.
When ups is working it shows battery voltage 0V and capacity 0%
So, is there a way to test this chip, should it produce output all the time while there is a 10V on VDD pin and some current on FB pin, or doest it start outputing when it senses power loss?
Does anyone has a schematic for this ups, CyberPower 1200E-B?
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