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Help with FSP212-3F01 low 24V and 12V!

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Turnip:
Hi Cheeky2

Thanks for the shematic, quite different from the usual FSP212-3F01 where I couldn't find your ICS4 as it didn't have one.

Matter of interest, what's a N3252W Tv as don't have it listed/can't find it -

Neon/Naiko/Neovia/Nordmende ?

Thanks again - Chris.

cheeky2:
Found the power supply from this ViewSonic N3252w-1M apparently they also the same power supply in some of there models in the USA found this out whilst searching for replacement psu on ebay
I will upload shortly the full service manual for it though the psu schematic has very little info on it ie caps or resistor values etc

vinceroger69:
hi im just working on the same psu just wondered if at all possible you could post the psu scheme up many thanks vince

cheeky2:
The schematic for the psu is already attached on my previous post. I couldn't upload the full schematic as it wouldn't allow me to do it on this forum in the downloads section!

gdesmarais:
FSP212-3F01 and FSP228-3F01 use the same board and same schematic. But FSP212 don't populate all the parts.

For the issue of low 24V and 12V, check ICS4. It's an AZ431AC shunt regulator. On my FSP212 unit, the +24V output was pulsing between 0V and 24V. I noticed that voltage across C1 was also pulsing between 160V and 320V, so I suspected the PFC stage. In my case  changing C8 from 2.2uF to 10uF fixed the unit. I noticed that on the FSP228 schematic C1 is a 10uF so i guessed that the FSP212 was derated too much at 2.2uF. Maybe it's enough when capacitor is new but issues arise with aging.

If there is no +12V and no +24V at all, change IC1 L6598D.

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