Is this E900 router fully bricked - or is there some hope?

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@m0eb@
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PostPosted: Sat Aug 15, 2020 4:25    Post subject: Is this E900 router fully bricked - or is there some hope? Reply with quote
I have an old e900 which was running perfectly okay with dd-wrt version 42557 - configured as a repeater

When I saw no broadcast from this repeater today - I opened this in the GUI (via WiFi) and did a reboot using the reboot button on the Services>>Services page.

The router restarted - but still no WiFi.

Then I removed the power plug and put it back on.

Since then - the router is not booting up.
All the LEDs are lighting up - but with a very low light intensity.
30-30-30 reset is not workig (no change in LEDs when reset is kept pressed)
Unable to ping the router even if I connect via ethernet cable.

Is this bricked?

At the time of removing the power plug, I noticed that the correct LEDs were glowing with normal brightness.

Though this is an old piece of hardware which has given it's due share of service over the years - I would like to attempt a recovery if this is possible. Can anyone help me - or guide me to where I can get some study material.

To eliminate that the power adapter is okay, I connected another adapter of the same specs. Same results - therefore I think the power adapter is okay and issue is with the router.

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kernel-panic69
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PostPosted: Sat Aug 15, 2020 5:30    Post subject: Reply with quote
Is this running a K2.6 or K3.x build?
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@m0eb@
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PostPosted: Sat Aug 15, 2020 8:27    Post subject: Reply with quote
kernel-panic69 wrote:
Is this running a K2.6 or K3.x build?


Thanks for responding.

It was dd-wrt.v24-42557_NEWD-2_K3.x_mega-nv64k.bin

This was running since last one week.

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@m0eb@
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PostPosted: Sat Aug 15, 2020 12:34    Post subject: Reply with quote
Should I try a serial recovery? (I mean is it still recoverable?)

Is this the correct adapter to be used for the E900?
The ad says:
The main chip CP2102, generates virtual serial port after installing the driver, Taking power, USB and elicit interface includes 3.3 V (< 40 ma), 5 V, GND, TX and RX, signal feet is 3.3 V, is logical



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kernel-panic69
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PostPosted: Sat Aug 15, 2020 13:01    Post subject: Reply with quote
I have one of those serial adapters, works good for me. If the router is completely not responsive, etc. then serial may be the way to go, if no management console web page comes up or you can't do the pin short method. I couldn't find any reports specific to that build and this router, so not sure what's up. Have you tried resetting to defaults to see if it's a config issue?
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blkt
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PostPosted: Sat Aug 15, 2020 13:14    Post subject: Reply with quote
Yes it will work, but do not connect the 5V line to anything. Though, I prefer FTDI chips and drivers over Silicon Labs or Prolific.

https://www.amazon.com/Serial-Adapter-Signal-FT232RL-Windows/dp/B07RBKCW3S

https://www.amazon.com/DSD-TECH-SH-U09C3-Isolated-Featuring/dp/B07TS3GPQ1

https://www.amazon.com/DSD-TECH-SH-U09C2-Debugging-Programming/dp/B07TXVRQ7V

https://www.amazon.com/DSD-TECH-SH-U09C5-Converter-Support/dp/B07WX2DSVB
@m0eb@
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PostPosted: Sat Aug 15, 2020 13:22    Post subject: Reply with quote
@Kernel-Panic69:
All LEDs glow dimly as soon as the device is switched on - and there is no response after that.

Reset does not respond.
30-30-30 does not respond.
No Ping (else at least I could try tftp)
In fact, when connected to my laptop via ethernet, the laptop does not even recognize that something is connected.
(Edit/Added image of what happens the moment I switch thr router on. Absolutely nothing seems to respond after that)

@Blkt:
I am in India - and my choices are pretty much limited to these...

https://www.amazon.in/s?k=USB+to+UART&ref=nb_sb_noss_2

There is a cable looking just like the ones you put up.



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blkt
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PostPosted: Sat Aug 15, 2020 13:51    Post subject: Reply with quote
DTECH Electronics and DSD TECH are China so if you search model numbers and/or description you should be able to find them on other sites, distributors for your region.

What sites do you normally use? Maybe I can search around. The FTDI chip itself is FT232RL.

https://www.amazon.in/DSD-TECH-Adapter-FT232RL-Compatible/dp/B07BBPX8B8

You may want to test the external power supply with a multimeter.

Another possibility is failing components inside the router such as capacitors.
@m0eb@
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PostPosted: Sat Aug 15, 2020 15:26    Post subject: Reply with quote
blkt wrote:
DTECH Electronics and DSD TECH are China so if you search model numbers and/or description you should be able to find them on other sites, distributors for your region.

You may want to test the external power supply with a multimeter.

Another possibility is failing components inside the router such as capacitors.


I had already ordered the above adapter (the picture I posted) because that gets delivered by Monday and costs 1/5th. If that doesn't work, I'll look at the one you suggested.

Capacitor may be an issue because I noticed a tiny spark twice - while inserting the jack into the router's power socket. A capacitor holding charge is one of the probable reasons for such sparks. Have to check this angle too.

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PostPosted: Sat Aug 15, 2020 15:57    Post subject: Reply with quote
CP2102 is fine. Does it come with a pin adapter cable or do you have one already? 0.100" (2.54mm)
@m0eb@
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PostPosted: Sat Aug 15, 2020 16:01    Post subject: Reply with quote
blkt wrote:
CP2102 is fine. Does it come with a pin adapter cable or do you have one already? 0.100" (2.54mm)


It comes with some cables (both side female), which is incompatible with the E900. But I have other cables that I can use to connect. (I hope these are the right ones as in the image)

A wee bit excited since I will be trying out the serial route for the first time. Now I guess I need to wait a couple of days till I get the adapter !!



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blkt
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PostPosted: Sat Aug 15, 2020 16:18    Post subject: Reply with quote
Sometimes the 5 pin header is already populated, sometimes not (far left).

https://www.smallnetbuilder.com/images/stories/wireless/inside_cisco_ea_series/cisco_e900_board.jpg

https://www.smallnetbuilder.com/images/stories/wireless/linksys_e900/linksys_e900_board.jpg

https://nm-projects.de/wp-content/uploads/2017/04/linksys_e900_4.jpg
@m0eb@
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PostPosted: Sat Aug 15, 2020 20:54    Post subject: Reply with quote
blkt wrote:
Sometimes the 5 pin header is already populated, sometimes not (far left).

https://www.smallnetbuilder.com/images/stories/wireless/inside_cisco_ea_series/cisco_e900_board.jpg

https://www.smallnetbuilder.com/images/stories/wireless/linksys_e900/linksys_e900_board.jpg

https://nm-projects.de/wp-content/uploads/2017/04/linksys_e900_4.jpg


Have checked this one. Mine is not populated (like the third link)

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