Electronics > Repair
Siglent spd3303x-e reboot problem
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tautech:

--- Quote from: parawizard on November 04, 2024, 02:22:16 am ---
--- Quote from: tautech on November 03, 2024, 07:09:23 pm ---
--- Quote from: parawizard on November 03, 2024, 11:25:44 am ---Realized my barely used SPD3303X-E has this issue.
Bought it end of 2021. Was troubleshooting a Lenovo Legion laptop power rail short and the thing kept reseting by itself under load and fully idle.

Siglent wanted me to send it internationally for warranty repair. Decided to fix it myself. One 470uF 50v Lenon cap spewed its guts out onto the giant cap next to it. All other caps tested good in circuit with ESR70.

Bridge rectifier is the 2W10 unit which self destructed while desoldering. Thing really doesn't look very hardy. Going to bodge a much larger single in line bridge rectifier. I am replacing surrounding caps with good 105c@10000 ones as well.
--- End quote ---

 :o
Dud cap is on the Power PCB ......never seen one of these give issues......yet.  :-//
--- End quote ---

I guess mines a special case  ;D


--- Quote from: tautech on November 03, 2024, 07:09:23 pm ---Ohio NA HQ would have replaced both PCB's with the latest versions.

--- End quote ---

Likely. Though it's going to cost me almost 100 CAD (Like 20% of the cost of the PSU) and a couple hours of my time to get it to them. I could get hit hard by customs on the way back over the border if something is off with the paperwork. Thing could get damaged etc. Or I could just recap some stuff, learn about the thing and replace that bridge rectifier instead.

--- End quote ---
With the photographic evidence you have supplied here and the 'known' faulty bridge reboot issue you might have given them the option to supply you the parts for repair.
parawizard:

--- Quote from: tautech on November 04, 2024, 06:40:28 am ---With the photographic evidence you have supplied here and the 'known' faulty bridge reboot issue you might have given them the option to supply you the parts for repair.

--- End quote ---

I agree. I did ask them. They declined.

Parts came in from DigiKey today. Installed new 470uF caps and referenced factory pictures to make sure no shenanigans with polarity. Turns out the cap that had the blow out was in opposite of the silkscreen.

Replaced caps around rectifier and bodged in a 4A SIL.

Edit: The + leg looks like it's laying across the - trace but its actually got more than enough space below it. Just perspective of the shot.
parawizard:
After about an hour with the case off it's about 70°C. Seems a lot more reasonable than the original part.
parawizard:
Has been working nicely without any restarts on the bench since the repair. Thanks to everyone who contributed to this thread.
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