fsp223-3f01 power supply

[piccy]

can anyone tell me what the ps_on pin is on these supplies or how i can start it
I have no 12 or 24 supply from psu

[budm]

Re: fsp223-3f01 power supply

Good clear pictures of the board? especially around the connectors.
STBY pin = PS-ON

[piccy]

Re: fsp223-3f01 power supply

Hi ,
thanks for pdf
pictures of board attached , i know the connector doesnt look sat in socket properly but i removed it and didnt put it back fully for photo

all tests were made with the connector in fully.

i was thinking of disconnecting the stby pin wire to measure the voltage on it then and see what it reads

is the voltage on the stby (ps_on) pin generated from the main board ?

[budm]

Re: fsp223-3f01 power supply

The main board sends out the PS-ON to turn on PFC Voltage booster and the rest of the power supplies, <1V = OFF, >2.5V = ON.

[piccy]

Re: fsp223-3f01 power supply

Just split the stby wire from the main board to the psu , with it disconnected from the psu i get 2.36v if i connect the wire to the psu it falls to 1.71v

deducting from that i guess the fault is on the psu side (unless the stby voltage should be higher than 2.36v )

removing the 24v connector makes no difference, removing the 12 connections may be more difficult

can i somehow put 3v onto the stby pin from say the 5v supply ?


just tried opening the pdf you posted there is just a link to a website , i will follow that

[budm]

Re: fsp223-3f01 power supply

What you can do is to leave off the STBY wire going back to the main board first, then use 300~1K resistor between the STBY pin of the power supply and the 5VSB pin of the power supply to force on the power supply. The DCV between the two legs of the main filter cap (450VDC) should jump up from 330VDC to >360VDC (PFC Voltage booster is turned on), this boosted voltage is needed for the 12V/24V power supply to run.

[piccy]

Re: fsp223-3f01 power supply

will try that later today , thank you will let you know the outcome

[piccy]

Re: fsp223-3f01 power supply

Hi Budm,
tried putting resistor across from 5v rail ,this put 3v onto stby pin voltage across main filter cap 317v before linking with resistor no increase after putting link in place so not sure where to go from here i will check the components in the circuit that the standby wire comes into theres a resistor diode and cap in there along with some optos

any suggestions welcome

[budm]

Re: fsp223-3f01 power supply

You need to check and see if the PFC Controller IC is getting the VCC Voltage to run when PS-ON is applied.

[piccy]

Re: fsp223-3f01 power supply

ok,
have you access to the schematic ? the link i followed doesnt show anything different to the one you posted (no drawing) , will also have a read of the links you posted to articles have read the basic troubleshooting one , will look at the regulator info

[piccy]

Re: fsp223-3f01 power supply

ignore most of the last post couldnt see the pdf attachment for some reason

[piccy]

Re: fsp223-3f01 power supply

looking at the drawing most of which i need to figure out and is going to have me scratching my head but am i right in thinking pfc controller ic is U601 ?

[budm]

Re: fsp223-3f01 power supply

U601 pin 8 (VCC), and GND pin 6.
Be real careful, you are making measurement in the HOT DEADLY side of the circuit.

[piccy]

Re: fsp223-3f01 power supply

think i will solder wires to the pins and get them away from the board , dont like nasty voltages, what should i expect vcc to be 5v ?

[budm]

Re: fsp223-3f01 power supply

Can you read the P/N printed on top of the IC? I expect 13~18VDC.

[piccy]

Re: fsp223-3f01 power supply

sorry, had to nip out will check it in the morning

[piccy]

Re: fsp223-3f01 power supply

Hi Budm
have measured voltage on u601 across pins 6 and 8 and i get 15.1v , i have connected the main board feed and it still reads 15.1v so i can presume the feed from the main board is sufficient to operate it , if i put the set in standby then the 15.1v disapears as you would expect.

just done a few checks round the pc501 opto on pin 1 i get 5.24v on stby and when remote pressed this drops to 1.4v suggesting to me that the transistor is being switched on

as a follow on presuming from that the opto is working as the supply vcc to ic601 is derived from this opto switching on , and having just realised from looking at the circuit i answered my own question (idiot) from the first comments above re U601 voltages

as i have no voltage increase on main filter cap and i have voltage to U601 then my checks are going to be around Q601 / Q602 area , is there anything else i may need to check around U601 (in your experience) and what is the best way to test the fet ?

[budm]

Re: fsp223-3f01 power supply

If you are getting the 15.1 VCC for the PFC IC then the PS-ON is working OK.
Nest thing we need to test are the PFC Diode D601, D602.

[piccy]

Re: fsp223-3f01 power supply

tested them they read ok with peak dca semiconductor tester (one leg out of circuit)

can i test for a voltage on there or is it now high frequency (dont fancy putting my scope in there )

cant see any shorts on q601 , d603 or q601 either

[piccy]

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