replacing schottky diodes on a AV power supply

[stj]

Re: replacing schottky diodes on a AV power supply

the sr320 looks fucked for a schottky - thats far too much voltdrop
probably damaged - just not as much as the other one.

[DjKrish]

Re: replacing schottky diodes on a AV power supply

i dont understand where you got the numbers,
test the diodes with your diode-test on the meter - both directions.

test on V mode while power on.

while take off from board, these are the reading on diode mode

sr320 - 0.343v
sr340 - 0.164v

[stj]

Re: replacing schottky diodes on a AV power supply

i dont understand where you got the numbers,
test the diodes with your diode-test on the meter - both directions.

[DjKrish]

Re: replacing schottky diodes on a AV power supply

What happen if you test the SR340 and compared to the SR320 with you meter?

SR320 - 15.33v
SR340 - 5.56v

No wonder theres no power when i put SR340. I wonder why

[budm]

Re: replacing schottky diodes on a AV power supply

What happen if you test the SR340 and compared to the SR320 with you meter?

[DjKrish]

Re: replacing schottky diodes on a AV power supply

I tried the following.

1 piece of SR340
2 piece of SR340
1 piece of SR320 and 1 piece of SR340

None works. If i pull all and put only 1 piece of SR320, it works. Sighs

[DjKrish]

Re: replacing schottky diodes on a AV power supply

That does not make any sense.
What exactly did you put in?

Its a home theaters SMPS. I know, it doesn't makes any sense either. But i dont know, i took out the old one, put in 2 new SR340, power on, no power. Pull out again, put in the old SR320 diode, its working and i was like LOL

[budm]

Re: replacing schottky diodes on a AV power supply

6A 20V, noted, will try that. Cause i fitted the 3A 40V diodes, no power at all. When i fit back the single 3A 20V, its working again.

That does not make any sense.
What exactly did you put in?

[stj]

Re: replacing schottky diodes on a AV power supply

higher voltage is fine - infact with schottky's you really want 10x the running voltage.

https://www.badcaps.net/forum/showthread.php?t=54038

[DjKrish]

Re: replacing schottky diodes on a AV power supply

neither, your going to need 6A at 20v, not 3A at 40v
parallel diodes double the current, not the voltage

if you check my Ryobi charger thread, i replace a couple of diodes with a 25A to220 package part

6A 20V, noted, will try that. Cause i fitted the 3A 40V diodes, no power at all. When i fit back the single 3A 20V, its working again.

[stj]

Re: replacing schottky diodes on a AV power supply

neither, your going to need 6A at 20v, not 3A at 40v
parallel diodes double the current, not the voltage

if you check my Ryobi charger thread, i replace a couple of diodes with a 25A to220 package part

[DjKrish]

Hi guys, i have a power supply with a shorted SR320 schottky diodes which is in parallel. Only 1 shorted while another is ok. So i removed the faulty one, the power supply is working fine now. SR320 is 3A 20V. I was thinking can i remove both diodes and replace SR340 as 1 diode as it is 3A 40V? Because i dont have SR320. Or can i replace both with SR340?