Re: Cheap Supply
and what is the +5V stby voltage now?
and what is the +5V stby voltage now?
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Re: Cheap Supply
The Protection IC is not faulty coz i changed it and still the same thing the PSU wont start with it,without it the output is pretty fine around 12.17 and 5.1..The standby voltage is still 5VComment
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Re: Cheap Supply
SUCCESS at last!!
Found the problem,its a shorted capacitor on the secondary side of the PSU..Changed it and the PSU is back ONLINE..Comment
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Re: Cheap Supply
cap? where?
if it was on main output rails (ie not the +5V stby) then optocoupler removal wouldn't help(as you only have 1 opto there and it's the one for +5v suppy., right? and +5v stby is separated from other rails), and if it was on +5V stby then you wouldn't have +5v there but less.
so was it cap that some ic uses?
show it in the pic.
lookin' at this
https://www.badcaps.net/forum/showpo...3&postcount=15
could it be that you blew that cap by wrong startup hookup, and that's all it was?
ie psu was ok prior to your first startup.Comment
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Re: Cheap Supply
The cap that had gone west was on the main 5v rail,When i removed the optocoupler the PSU booted and the 5V standby jumped to 12V (posted wrongly as 5v in my previous post
)..I'll post some pics soon.
I really dont know when that cap (1500 uf 10v) went bad,maybe when i shorted the wrong pins then it fried.Comment
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Re: Cheap Supply
>posted wrongly as 5v in my previous post
ah..there you go...so now we can say for sure what was happening:
shorted cap was blocking the main 5v rail. removing the coupler brought +5v stby to 12v and this affected the control ic in such a way that it raised all output voltages, even though one cap was shorted.
running it for prolonged period like that would probably burn something else.
glad to see you fixed it...Comment
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I saw this switching power supply on eBay and wanted to see if could be modified to run 14.5 volts before the blocking diode was add and this switching power supply seems to have no issues doing this
I did recap the switching power supply except the the main filtering capacitors and I managed to break the selector switch for the voltage setting but just jumped it
One note I used 25 volt capacitors on the output side of this power supply because they used 16 volt capacitors and because I am running the voltage up a little bit higher 12 volts to 14.5 volts there would... -
I have been wanting to do this project for some time using a Mean-well switching power supply that I bought at least ten of them that were originally in a device that was abandoned for some reason they were listed new but removed from equipment that was never used
I do not understand Mean-well the capacitor next to the voltage reference ic chip was a brand that is known for failure over time the other capacitors are brand name needless to say it got replaced before I even powered it on for the first time
I used a four USB outlet and electrical plate that is made for... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
This is the switching power supply that is used in this project
https://www.ebay.com/itm/164440680270?var=464055952700
Here is the BMS protection board
https://www.ebay.com/itm/38688703079...iiBFn%2B3x1VjJ... -
Hi everyone,
Brought a non functionnal PS5. Apparently only a bad PSU...
No beep, nothing.
After some tests i found this :
- PSU is fine (12 volts stable)
- 12 volts line is shorted
- DA9065 was fried, F7003 also => Replaced both of them, short is gone on 12 volts line, no dead short anywhere else.
- By the way, nothing change. No signal, no power, no beep.
Mesuring all rails with my workbench psu (12 volts input)
- 0.00 amp drawing
- 12 volts, 5 volts, 2 volts, 1,15 volts are presents (suppose new DA9065 do is...
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