Author Topic: Siglent spd3303x-e reboot problem  (Read 7194 times)

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Online tautech

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Re: Siglent spd3303x-e reboot problem
« Reply #25 on: August 19, 2024, 04:43:27 am »
As this Florida man pointed out, it is hard to access the other side of the board to remove the bad bridge rectifier.
Yet the control/front panel PCB is not at all difficult to remove.

A few leads, and screws and the complete front panel is free along with the control PCB.
Binding post screws and PCB mount screws removed the PCB can be worked on with ease and another replacement rectifier solution fitted.

As it's for LV AC and the DC smoothing circuit remains on the PCB a replacement bridge can be mounted remotely with a 4 wire loom to a place where it's most convenient for those undertaking this repair.

With care and control of wayward swarf, one of the main heatsinks can be drilled and tapped to provide an excellent mounting position for a remote bridge.
It should be stressed that careful heat shrinking/sleeving of any wires be undertaken to prevent any shorts and care also with connections being correct. THe PCB is clearly marked as in expected for a bridge, AC + AC - as is normal for a bridge too.
Don't muck this up......
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Online tautech

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Re: Siglent spd3303x-e reboot problem
« Reply #26 on: August 19, 2024, 04:46:30 am »
Hi yeah true but given consensus is bridge fails due to heat and that it is under-specified then probably best to replace with upgrade as rest of bridge probably will fail eventually.
Not IMO.

Early units had zero failures then something changed, where I suspect a different supplier was used or the bridge manufacturing process was changed....or both.
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Offline parawizard

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Re: Siglent spd3303x-e reboot problem
« Reply #27 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.
« Last Edit: November 03, 2024, 11:27:45 am by parawizard »
 

Online tautech

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Re: Siglent spd3303x-e reboot problem
« Reply #28 on: November 03, 2024, 07:09:23 pm »
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.

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

Ohio NA HQ would have replaced both PCB's with the latest versions.
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Offline parawizard

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Re: Siglent spd3303x-e reboot problem
« Reply #29 on: November 04, 2024, 02:22:16 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.

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

I guess mines a special case  ;D

Ohio NA HQ would have replaced both PCB's with the latest versions.

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.
 

Online tautech

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Re: Siglent spd3303x-e reboot problem
« Reply #30 on: November 04, 2024, 06:40:28 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.

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

I guess mines a special case  ;D

Ohio NA HQ would have replaced both PCB's with the latest versions.

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.
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.
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Offline parawizard

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Re: Siglent spd3303x-e reboot problem
« Reply #31 on: November 06, 2024, 11:18:01 pm »
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.

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.
« Last Edit: November 07, 2024, 01:49:07 am by parawizard »
 
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Offline parawizard

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Re: Siglent spd3303x-e reboot problem
« Reply #32 on: November 07, 2024, 01:51:58 am »
After about an hour with the case off it's about 70°C. Seems a lot more reasonable than the original part.
 

Offline parawizard

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Re: Siglent spd3303x-e reboot problem
« Reply #33 on: November 11, 2024, 09:10:30 am »
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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