Re: TDS754A

Stephen Hanselman

I would suggest you open it up remove the proc board and PS cover. Then blow out the dust. We have found any “new” unit to our facility was fairly dirty. The split wall between the PS and HVPS is perforated but with small holes which clog easily.


Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
a Service Disabled, Veteran Owned Small Business
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On Aug 20, 2019, at 07:37, Siggi <> wrote:

Hey Dana,

IIRC the standby power supply that allows soft-power on is also responsible
for powering the main switcher. Maybe the standby supply needs recapping.

The TDS5/6/7As are also well documented to suffer from capacitor plaque.
There are SMD electrolytic capacitors all over the acquisition, CPU and
front panel boards. If yours hasn't been re-capped, then that's also a
possible explanation for what you're seeing.


On Tue, Aug 20, 2019 at 10:25 AM danadak <> wrote:

This scope has been excellent to date. Now when turned on it
power cycles. It will start up, most of the time complete the POST,
then power itself off after a minute or two.

Before I spend the next century trying to find the problem anyone
have a similar experience ?

Regards, Dana.

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