Author Topic: DSO-X 4154A no display  (Read 455 times)

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Offline rtekal

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DSO-X 4154A no display
« on: October 10, 2018, 07:45:10 pm »
Hi,

I have a Agilent DSO-X 4154 A in which the display is not coming. I have monitored the voltages mentioned in the service manual. The VP25V (Backlight power) and the (VP13VPRB Auto probe power) are not coming. The front panel lights of Ref, Math & Digital glow sequentially and stops there.

I tried analyzing the power up process and found that the NCP3064 pin 5 on/off is held low. I am unable to find out the source for this control pin.

Anyone who has faced and resolved this problem, please help. I have 2 more MSO's with the same issue.

I read in the other forums that Keysight has a service note 3 for this problem, but Keysight has removed that service note. As it is out of warranty, they are charging a bomb to replace the acquisition board.

Regards
 

Online HighVoltage

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Re: DSO-X 4154A no display
« Reply #1 on: October 10, 2018, 08:43:11 pm »
Did you try to remote access the scope to see is the scope works and it is only the display?

How did this problem happen on this one and the other two scopes?
There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline CJay

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Re: DSO-X 4154A no display
« Reply #2 on: October 10, 2018, 11:10:39 pm »
Connect an external monitor, try to connect remotely to the scope as HighVoltage suggests, try a factory reset if it's possible via the keypad.
M0UAW
 

Offline Pinkus

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Re: DSO-X 4154A no display
« Reply #3 on: October 11, 2018, 12:25:54 am »
The front panel lights of Ref, Math & Digital glow sequentially and stops there.
It looks like, the boot process stops at this point. Thus it would be better to change the title of the thread to "DSO-X 4154A no boot"
It would be helpful to see the output at the UART to get an idea at what exact point the boot stops as this might lead to the cause.

My DSOX4024A (from January 2013) also recently started to stop booting every 2nd day and it then needs another try, sometimes 2x (off-on) is not enough and it takes several times. Firmware is the latest version.  Thus this service note 3 would be of interest for me too. I am wondering if the flash problem also occurs at (maybe only earlier) DSOX4000 series scopes? Maybe Daniel can help?

Edit: I also found the thread, where this service note (MSOX4154A-03) was mentioned: https://community.keysight.com/thread/35583
Google finds nothing.
Does anybody have an idea?

Edit2: Did you check the voltage of the battery on the board (visible on the bottom of the first of your pictures)?

Edit3: While this is the correct section repair, you would get much more and qualified answers if you would ask this question in the section test equipment. There are many Agilent/Keysight hanging around - and they probably do not look often into the repair section.
« Last Edit: October 11, 2018, 03:24:37 am by Pinkus »
 

Online HighVoltage

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Re: DSO-X 4154A no display
« Reply #4 on: October 11, 2018, 01:38:24 am »
If it really is a boot problem and even better, a NAND corruption problem, contact Keysight first.
Even if your scope is out of warranty, Keysight might fix it for free.
I just don't know, if the 4000X series scopes also had the boot problem like the 2000X and 3000X scopes had.

I just had the problem with a 3000X scope, that was out of warranty and Keysight fixed it within 10 days for free!
There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline TheSteve

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Re: DSO-X 4154A no display
« Reply #5 on: October 11, 2018, 03:36:17 am »
If you want to know what the problem is then connect to the serial header inside and post the output.
VE7FM
 

Offline Samogon

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Re: DSO-X 4154A no display
« Reply #6 on: October 11, 2018, 12:16:34 pm »
   rtekal
Since you have open unit, can we ask you to make hires pictures of front end both sides. Yes i know  you have to remove shielding can. But if you do we will have great opportunity to do 4024A to 4154A mod. That will greatly benefit community.

Thank you
 

Offline rtekal

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Re: DSO-X 4154A no display
« Reply #7 on: October 11, 2018, 08:54:15 pm »
Did you try to remote access the scope to see is the scope works and it is only the display?

How did this problem happen on this one and the other two scopes?

It just did not boot up the next day.
 

Offline rtekal

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Re: DSO-X 4154A no display
« Reply #8 on: October 11, 2018, 08:58:26 pm »
Battery is good.

Will repost in test equipment .

Regards
 

Offline rtekal

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Re: DSO-X 4154A no display
« Reply #9 on: October 11, 2018, 09:04:02 pm »
If it really is a boot problem and even better, a NAND corruption problem, contact Keysight first.
Even if your scope is out of warranty, Keysight might fix it for free.
I just don't know, if the 4000X series scopes also had the boot problem like the 2000X and 3000X scopes had.

I just had the problem with a 3000X scope, that was out of warranty and Keysight fixed it within 10 days for free!

They have stopped free repair / replacement for the 2k / 3k /4k series and that is the reason they removed the service note.
 

Offline Pinkus

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Re: DSO-X 4154A no display
« Reply #10 on: October 11, 2018, 09:04:52 pm »
Did you try to boot (switch off-on) several times in a row? I read somewhere, that it might take 10x and eventually it will boot.
 

Offline Pinkus

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Re: DSO-X 4154A no display
« Reply #11 on: October 11, 2018, 09:06:24 pm »
Quote
They have stopped free repair / replacement for the 2k / 3k /4k series and that is the reason they removed the service note.
:scared:
You are kidding, aren't you? Is this official? How do you know?

Edit: I chose my DSOX4024a only because Keysight recognized a problem with the DSOX2000/3000 NAND/flash problem and reacted obligingly and user-friendly. This impressed me very much and gave the Keysight brand a massive boost over all other competitors. I am certainly not the only one.
Should they just tear it down like that? I can hardly imagine it.
« Last Edit: October 11, 2018, 09:15:31 pm by Pinkus »
 

Offline rtekal

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Re: DSO-X 4154A no display
« Reply #12 on: October 11, 2018, 09:07:39 pm »
   rtekal
Since you have open unit, can we ask you to make hires pictures of front end both sides. Yes i know  you have to remove shielding can. But if you do we will have great opportunity to do 4024A to 4154A mod. That will greatly benefit community.

Thank you

The image limit is 1mb, so a hi-res may be tough, but will try it out.
 

Offline rtekal

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Re: DSO-X 4154A no display
« Reply #13 on: October 11, 2018, 09:13:03 pm »
Quote
They have stopped free repair / replacement for the 2k / 3k /4k series and that is the reason they removed the service note.
:scared:
You are kidding, aren't you? Is this official? How do you know?

Have spoken to Keysight. They will do a free repair only for a continuously restarting instrument, but not for a dead / non booting instrument.
 

Offline TheSteve

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Re: DSO-X 4154A no display
« Reply #14 on: October 12, 2018, 03:21:18 am »
95% this is still NAND corruption. If the corruption occurs later in the boot process the scope will restart, if it happens very early in the boot process the scope will hang.

The serial port will reveal all.
VE7FM
 


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