fsp223-3f01 power supply

[budm]

Re: fsp223-3f01 power supply

what value would you expect r621 (bottom leg of Q601 i measured it at 0.5 ohm ? high wattage

could i have a bad main filter cap even though it measures ok on an esr meter

That Source resistor should be <1 Ohm, so it is OK. with bad cap it still should get boosted Voltage but may not be stable.
So the two diodes tested OK?
Are you able to get the P/N of the PFC IC?

[piccy]

Re: fsp223-3f01 power supply

not main cap fitted one and it goes up by a volt interestingly for a brief few seconds it very quietly made buzzing (normal running type of noise) so think a poss break in a track or dry joints though no obvious ones so will have a little resoldering session

[piccy]

Re: fsp223-3f01 power supply

yes two diodes tested ok
part number i can see on chip is 1606B (the b may be an 8 difficult to make out

[vinceroger69]

Re: fsp223-3f01 power supply

maybe one of these
http://pdf1.alldatasheet.com/datashe...I/NCP1606.html

[piccy]

Re: fsp223-3f01 power supply

thanks for that will check it
pins are marked different schematic i have

pin1 FB
pin2 comp
pin3 mult
pin4 cs
pin5 zcd
pin6 gnd
pin7 drv
pin 8 vcc

will compare the two , have just found a schematic for fsp115-3f02 that uses a fan 7930will compare the circuits

are there any other tests i can make round the chip that will show if it is working ?

[piccy]

Re: fsp223-3f01 power supply

just resoldered a few connections on the board and there is now a intermittent faint buzz coming from the board - seems to do it for a short time then stops have warmed it with a gentle heat source seems to make no difference

[vinceroger69]

Re: fsp223-3f01 power supply

sometimes on faulty boards i give them a heat up with a hair dryer for three to four minutes if bad capacitor issue it some times get them working tempory

[piccy]

Re: fsp223-3f01 power supply

just resoldered a few connections on the board main filter cap voltage is now up to 320v and the buzzing is all the time ( normal operation type buzz ?)

[budm]

Re: fsp223-3f01 power supply

If your AC line Voltage is at 230V, then the Voltage on the cap without the PFC booster will be = 230 *1.414 =325V.

[piccy]

Re: fsp223-3f01 power supply

so at 320v its not far away , not sure where to progress now any suggestions please budm,

have spotted a psu for sale in uk i may order it , i will then use that to find fault area on the original supply , bit of a cheating way wanted to get to the bottom of this the proper way