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Rigol red screen of death

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helge:
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.

BravoV:

--- Quote from: helge 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 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.

--- End quote ---

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

helge:
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.

BravoV:
Thanks, how old is it ?

tautech:

--- Quote from: BravoV on December 28, 2019, 09:03:11 pm ---Thanks, how old is it ?

--- End quote ---
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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