The CPU for the CP1500 the CP1350 has a similar part with a CP1350 label. Could not find any ST reference designs similar to this UPS
Digikey says ST72F63BK2M1 is Obsolete and no longer manufactured ST7 ST7 Microcontroller IC 8-Bit 8MHz 8KB (8K x 8) FLASH
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steve_l
Member
Last Activity: 02-13-2025, 08:29 AM
Joined: 01-25-2025
Location: Broward FL
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Picked up a solenoid piston solder sucker for cleaning thru holes and it seemed effective at a low cost. No temp control and has wires for heater in the rubber tube from handle to tip. It seemed to work well to remove a thru hole part from another board. There are youtube videos for "solenoid desoldering tool" Might not last long. Can go back in the box until next time.Leave a comment:
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After pausing for a few days determined there was 27V DC charging voltage on the battery wires with the unit plugged in and not connected to battery. Changed to fresh batteries and it appears to be working. For future reference the voltage on the 22 uF cap is about 14 Vdc when the VIP is working. There's a small red wire coming out of the transformer next to the red battery wire to a 3 pin connector- which might be a test point for battery voltage. I think there was 14V dc on the 22 uF cap before changing the VIP so it was probably ok. One more ups saved from the scrapper.Leave a comment:
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Replaced the VIPer 22 IC and C25 with 47 nF at first it behaved like it did before. Passing self test but not really charging the battery. After probing around the VIPer 22 something must have got shorted,and the UPS went into constant alarm showing the overload light on display and then shutting down after a few seconds. I think the original problem was somewhere else. Maybe I broke the VIPer22? I see some other threads on older Cyberpower UPS, this one appears to have a TL voltage reference and 4 pin opto isolator. Any suggestions? might need to watch some videos on desoldering without...Leave a comment:
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The 2nd UPS Cyberpower a CP 1500 has a very similar PC board but has a larger transformer. Using LCR meter the 33uF cap tested ok in circuit at 30 uF the 22uF tested at 3 uF in circuit. Replaced 22uF but only measured 14 V on it with power on. Removed the Viper 22 IC and lost C25. From various Viper 22 circuits found online, it appears to be 47 nF between FB and Source. Have ordered a smd cap assortment of 0805 size parts. Will try cleaning the ic pin holes with a pin.Leave a comment:
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Have another cyberpower ups with same symptoms. No errors but just does not seem to be chargingLeave a comment:
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Parts arrived today, removed the caps as a confidence builder. 33uF was easiest to remove tested ok on LCR so put it back in, 22 uF came out and had a very low value under 1 uf. Replaced with new part. Was not wanting to remove the 8 pin VIP so plugged in the batteries and powered it up and it appears to be charging. Looked like there was 25 kHz +dc near the 22 uF. Have noticed the fan only runs when on battery power. Thanks for the valuable UPS repair info.
Has anyone tried using LiFePO4 batteries in UPS?Leave a comment:
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Waiting for parts to ship. Noticed the darkened PC board under the VIPer22A DIP IC under both my photos and pete_c. Does this part or something nearby run that hot? Would some type of heat sink or additional air flow help?Leave a comment:
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Cyberpower CP1350AVRLCD UPS alarmed for low battery. New batteries were purchased, The old batteries were removed and still had 23V. Was able to connect them to a variable supply and charge them up to 28V, When replaced in the UPS it would perform self test, but the battery life kept going down and there was no sign of charging. After much web searching found this thread. Have ordered the recommended parts.Leave a comment:
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Hello Looks like some good info here on Cp1350 UPS not chargingLeave a comment:
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