Power Board FSP212-3F01 Problem

[badcaphunter]

I picked up a Hannspree tv with this power board, i have replaced Q9 Q7 Q11 ZD4 and R65, i have got a replacement for Q4 but its reading ok.

I have no standby or anything at all on the secondry side and i'm getting -120/-150 on the primary side heatsinks.

Pin 4 on IC4 should be about 14v but i'm getting -120

The bridge rectifier is reading fine.

[budm]

Re: Power Board FSP212-3F01 Problem

You are using the wrong GND for your meter, when making the DCV measurement in the Primary Main side circuit, you have to use the negative leg of the MAIN filter cap as the GND ref. for your meter, not the chassis GND.
Good clear pictures of the board?

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

Im still waiting for some caps but i changed what i could.

I will post some more pics later

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

Should i remove all the white glue, is it conductive?

[CapLeaker]

Re: Power Board FSP212-3F01 Problem

unless you change a part that has the white glue, leave it. You can easily measure if the glue is conductive by putting your DMM in Ohm mode and stick your probes into the glue.

[budm]

Re: Power Board FSP212-3F01 Problem

I picked up a Hannspree tv with this power board, i have replaced Q9 Q7 Q11 ZD4 and R65, i have got a replacement for Q4 but its reading ok.

I have no standby or anything at all on the secondry side and i'm getting -120/-150 on the primary side heatsinks.

Pin 4 on IC4 should be about 14v but i'm getting -120

The bridge rectifier is reading fine.

So how bad are those parts you changed were tested out to be? P/N of those parts?
Q9 Q7 Q11 ZD4 and R65 Where are they located at? They are SMD on the bottom side of the board?
I also see one cap in the top left with bulging top so you probably has more than one bad cap on the board, especially the small lytics caps in the primary side.

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

The main blue cap is going up and down from 346v to 350v, and i'm getting 4v to 7v on pin 1 of IC1

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

Yes they are all underneath the board on the primary side

Q7 - BC848

Q9 Q11 - BC858

ZD4 - BCX55C4V7 4.7V

R65 - 5.6 Ohm Resistor

[budm]

Re: Power Board FSP212-3F01 Problem

So did you replace that cap with bulging top and check the ESR of other caps.

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

I dont have a ESR meter but all of the caps on the secondary side were bloated so i changed what i could, there is still 2 that are bloated, the replacements should be here tomorow

[badcaphunter]

Re: Power Board FSP212-3F01 Problem

Still waiting for the caps, i managed to get standby 5v. no sign of 12v, 24v.
Now that standby is there, when i press the power button i'm getting a pulsing clicking noise, not as loud as a relay, coming from near the bridge rectifier when the standby light goes from red to green, i have also ordered a esr meter and a load of low esr caps.

I dont think that schematic i posted is for this revision as some of the values are slightly different.

This youtube channel has been a great help for me, i would not even consider myself a novice..... yet


https://www.youtube.com/channel/UC2D...11URZqWBigcVOQ

The reason i did not have any standby voltage is the diode i used was 4.7v and needed to be 15v

Anyone else working this psu "BE CAREFUL" it has half mains voltage going through the heatsinks... trust me i found out the hard way