Author Topic: Rigol red screen of death  (Read 6792 times)

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Offline helge

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Re: Rigol red screen of death
« Reply #50 on: December 28, 2019, 07:16:57 pm »
Resoldered the bottom side passives on the secondary associated with the voltage feedback and checked voltages again:

Blue: 16.64 V
Grey: -16.51 V
White: 9.66 V
Yellow: 6.56 V
Green: -6.51 V
Red: 5.08 V

 :-DMM

Let's see if that fixed it.


ps. in fact soldering the joints on the power supply PCB did resolve the issue and scope is back in operation. Hope this helps somebody out there at some point. As the mode of failure was likely an out-of-spec divider on the power supply, I'd expect a failure mode where overvoltage is produced. I'd need to go go back and check whether there is OVP on the mainboard. Without that, a faulty power supply would easily be able to blow up the PCB (many PoL DCDC converters have 6-6.5V abs. max. input and fail when driven above that. With a pass-through failure, the downstream parts are toast.
« Last Edit: December 28, 2019, 09:05:13 pm by helge »
 
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Offline BravoV

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Rigol DS1054Z repair
« Reply #51 on: December 28, 2019, 08:22:02 pm »
Resoldered the bottom side passives on the secondary associated with the voltage feedback and checked voltages again:

Blue: 16.64 V
Grey: -16.51 V
White: 9.66 V
Yellow: 6.56 V
Green: -6.51 V
Red: 5.08 V

 :-DMM

Let's see if that fixed it.


ps. in fact soldering the joints on the PCB did resolve the issue and scope is back in operation. Hope this helps somebody out there at some point. As the mode of failure was likely an out-of-spec divider on the power supply, I'd expect a failure mode where overvoltage is produced. I'd need to go go back and check whether there is OVP on the mainboard. Without that, a faulty power supply would easily be able to blow up the PCB (many PoL DCDC converters have 6-6.5V abs. max. input and fail when driven above that. With a pass-through failure, the downstream parts are toast.

Thanks for sharing, if I'm not mistaken, your post is the 1st one that reported Rigol DS1054Z repair.

How old is that scope ?

Also regarding the fixing by re-soldering joints, which joints exactly ? As this may be useful for future owner should they experiencing similar problem.

As this forum alone has quite some number of aging DS1054Zs.  :P
« Last Edit: December 28, 2019, 08:23:44 pm by BravoV »
 

Offline helge

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Re: Rigol red screen of death
« Reply #52 on: December 28, 2019, 08:59:57 pm »
recommend soldering joints / checking resistors for damage:

yellow: circuitry around the optocoupler
orange: more suspect circuitry around switch-mode controller IC? (SO-8 part)

scope is 2014 vintage.
« Last Edit: December 28, 2019, 09:04:03 pm by helge »
 
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Offline BravoV

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Re: Rigol red screen of death
« Reply #53 on: December 28, 2019, 09:03:11 pm »
Thanks, how old is it ?
« Last Edit: December 28, 2019, 09:18:52 pm by BravoV »
 

Offline tautech

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Re: Rigol red screen of death
« Reply #54 on: December 28, 2019, 09:17:12 pm »
Thanks, how old is it ?
Don't think that matters unless the SMPS has a different layout/design in new units.

Here, the heaviest component on the PCB is the SMPS transformer and it would seem a bump has flexed the PCB resulting in cracked solder joints....hardly surprising considering it's placed near the middle of the PCB and the mounting points are only on the corners.
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Offline BravoV

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Re: Rigol red screen of death
« Reply #55 on: December 28, 2019, 09:19:20 pm »
scope is 2014 vintage.

So its 5 years old ... thanks.

Offline BravoV

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Re: Rigol red screen of death
« Reply #56 on: December 28, 2019, 09:22:03 pm »
Thanks, how old is it ?
Don't think that matters unless the SMPS has a different layout/design in new units.

Statistically speaking, it is really matter, once other DS1054Z owner experiences similar problem, and fixed using similar method.


Offline helge

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Re: Rigol red screen of death
« Reply #57 on: December 28, 2019, 09:53:00 pm »
failure of components and solder joints under shock- and vibration-induced flexure could have been mitigated, the main culprit in the design process could have been clearance / creepage distance.
When in doubt, I think a nylon hex spacer could have made all the difference over the lifetime of the product. The caps sure look the part and there is no other visible degradation or even accumulation of dust and grime on the PCB.
 


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