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MSO-X 4154A is not starting from power-on

Question asked by AlexTrif on Sep 5, 2018
Latest reply on Sep 26, 2018 by kwsj

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Hi,
Our oscillograph InfiniiVision 4000X MSO-X 4154A was not used very long time .
Now the oscillograph is not starting: after pressing power-on key all LEDs on a control panel blink twice.
After that only one LED (near "Ref" button) is on.
The display keep black, fan work, oscillograph does not react to pressing any button.

Five times press power-on button (as recommended here in one of the threads) do not lead to switching display on.

There is a guess about deep discharge of the lithium battery on-board.
How can I resolve this issue?
Whether it is possible to make something youself without addressing to Repair Service? The warranty already expired.

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algoss Sep 5, 2018 5:19 AM
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This is a question that should be addressed by your local Technical Call Center. Go to www.keysight.com/find/contactus for your local contact information.

The Keysight Forums are not intended as a means to contact Keysight Technical Support. They are only occasionally monitored by Keysight technical personnel.

Al
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glowitz Sep 21, 2018 5:42 PM
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I just saw your post and I have the exact same symptom with our MSO-X 4034A, and it stays locked up also on the REF light. We were quoted nearly $4K to repair and recalibrate it by Keysight, but I'm thinking it may be something simple due to the long-term unplugging situation. Ours was also unplugged for over a year or longer. A product of this "quality" should not fail after being unplugged. Since posting this, have you tried opening it up and checking anything obvious? Have you had it fixed? If so, what was the problem? If I can isolate this to a component or board, I'd like to explore that route. (For clarity, I did initially contact Keysight support yesterday but they had no suggestions on things to try and just quoted me the repair fee). The fact that both of our products have the same symptom, and stop booting at the same point in the front-panel light test sequence is an important clue. I'm sure someone familiar with these scopes may have some ideas. This should not happen and may only be starting to show up after a few years since the mfg. date.

See my post here with a video of the symptom: MSOX-4034A Boot Up Fail
I've also included some links to similar threads. Hopefully we can get to the bottom of this with community support.
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- AlexTrif @ glowitz on Sep 23, 2018 10:32 AM
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  Yes, symptoms exactly the same as in video in your post. I did not disassemble the oscillograph yet. I wait for decision head of our department . Service center of Keysight responded repair can cost in the price to $400 without recalibration. Refused to answer a question of possible defect. Though "Ref" LED light is obviously the error code... I have an guess that it is deep discharge of the lithium CR2032 battery + firmware is "ugly" processing this situation.
  Video of disassembling on Youtube:
  https://youtu.be/iUBb4S8LoO0
  9:25 - lithium battery.
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  - glowitz @ AlexTrif on Sep 24, 2018 4:48 PM
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    Hi Alex, I'd be interested to hear if changing the battery solves the boot-up problem. From what I understand, though, the CR2032 battery is mainly for the real-time clock and should have a long life (relative to how long you've had the scope). Your repair cost is much different than what Keysight quoted me, so I'll have to look into that as well (minus the cal part). Meanwhile, I'm continuing to work with Keysight to understand what's happening and see if they will take care of it. From doing research online, this same (in some cases identical) symptom has been reported in various forums, including for other models in the same X-series family. I watched the YouTube video of the tear-down and see that the voltage was marked on the battery at the time of manufacture. Not sure if that was done on all units or not. Are you going to crack it open and replace the battery? If you do, let the Keysight Forum know what you find out and what the battery voltage is when powered up (so there is some drain on it) and when removed. If by chance this fixes the problem, that would be important to know!
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kwsj Sep 26, 2018 12:31 PM
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Hi Alex,
Please don't disassemble the oscilloscope!

The symptom you're describing is covered by a Keysight Service Note MSOX4154A-03. I'm not sure where you're located. Please contact your regional Keysight contact center and request service on the unit. Cost is covered by the service note.
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MSO-X 4154A is not starting from power-on

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