Linksys EA6900 power problem

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__Dante__
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PostPosted: Wed Mar 04, 2020 11:12    Post subject: Linksys EA6900 power problem Reply with quote
Hi guys,

I have recently got a second hand EA6900 router because i need some changes done to my home network.

However, this router seem to have problem with the power supply - it restarts constantly.

I have opened it up and found out that on the board, right after the power plug, there is a part missing (probably the router fel some time ago, somewhere in a galaxy far far away). I guess it is either a diode or a capacitor of some sort but I am not entierly sure.

I can solder this part, however I cannot seem to find information on what it is, or pictures with good enough quality so that I can read the part number.
It is that small black part after the power plug (image in google drive):
https://drive.google.com/open?id=1a8HvBG5F6F-H3KOh4vjE7ndRvix6lmxt

Can anyone help me or post me some good quality picture of the letters on that part?
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kernel-panic69
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PostPosted: Wed Mar 04, 2020 13:08    Post subject: Reply with quote
It's probably a surface-mount capacitor, but I don't have one of those on the bench to post a picture of the details.
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__Dante__
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PostPosted: Thu Mar 05, 2020 15:40    Post subject: Reply with quote
Initially I thought so as well, as it is connected to ground and voltage, however, where there are capacitors on the board, their designations start with C{numbers}, while this one is named D9... may be it was some sort of diode... not sure :S.

I've found out that two of the ports do not work (1 and 3) and i guess this router suffered a lightning strike or quite the fall... so may be it is beyond repair Sad
kernel-panic69
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PostPosted: Thu Mar 05, 2020 15:49    Post subject: Reply with quote
Or diode*, forgot about those on input circuit to prevent reverse-current. Sounds like the lacking component created more havoc than initially known. Wonder if you can RMA it or if it's even worth it. I would have to have it in-house to go component by component to see what broke.
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__Dante__
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PostPosted: Thu Mar 05, 2020 15:57    Post subject: Reply with quote
I doubt that it is worth it... if 2 of the 4 ports are not working, it will not be of use to me.

Thank you for the help anyway Smile
gtessa
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PostPosted: Thu Jun 04, 2020 13:44    Post subject: Reply with quote
__Dante__ wrote:
Initially I thought so as well, as it is connected to ground and voltage, however, where there are capacitors on the board, their designations start with C{numbers}, while this one is named D9... may be it was some sort of diode... not sure :S.

I've found out that two of the ports do not work (1 and 3) and i guess this router suffered a lightning strike or quite the fall... so may be it is beyond repair Sad


I am having some issues with a EA6900 myself. Happened to have it opened on my desk and got that photo of the item you are trying to identify.



20200604_102849_m.jpg
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EA6900 Power components.
 Filesize:  255.33 KB
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kernel-panic69
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PostPosted: Thu Jun 04, 2020 15:26    Post subject: Reply with quote
So, it's a resistor. No telling what the value is, though.
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arssant
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PostPosted: Fri Jun 05, 2020 21:47    Post subject: Reply with quote
kernel-panic69 wrote:
So, it's a resistor. No telling what the value is, though.


You guess right at 1st time, It´s a diode. 1st clue D9 over the PCB, 2 clue: Z16, zener diode , value ? Pretty sure it a zener diode used as regulator. 3 clue, can´t be a resistor, the white stripe close to the white rectangular mark, is an indicator for polarity, orientation, resistor don´t have polarity.
kernel-panic69
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PostPosted: Fri Jun 05, 2020 22:48    Post subject: Reply with quote
I guess I needed to re-look at the first picture. I was looking at R353 for some reason.


20200304_130439.jpg
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