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Old 04-14-2018, 04:28 AM   #1
alindumitru46
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Default Corsair K70 RGB dead

In new times, new problems . It is understandable here, being a forum dedicated to repairs.
So my problem is with one Corsair K70 that I received from my brother-in-law.
Initially it started normally but after installing the Corsair software it started to trouble: keyboard lock, computer lock, restarts and finally dead...
I opened it and I found that there were a lot of coffee grounds
I thoroughly cleaned with a brush and isopropyl alcohol and re-assembled.
After 3 attempts to start, it was not recognized by any computer.
I tried to research but I did not have a chance, so I appeal to your guidance and advice.
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Old 04-14-2018, 01:02 PM   #2
Dan81
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Default Re: Corsair K70 RGB dead

Tried checking the PCB(s) where the USB comes from? Coffee might've shorted something.
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Old 04-14-2018, 01:43 PM   #3
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Default Re: Corsair K70 RGB dead

Quote:
Originally Posted by alindumitru46 View Post
In new times, new problems . It is understandable here, being a forum dedicated to repairs.
So my problem is with one Corsair K70 that I received from my brother-in-law.
Initially it started normally but after installing the Corsair software it started to trouble: keyboard lock, computer lock, restarts and finally dead...
I opened it and I found that there were a lot of coffee grounds
I thoroughly cleaned with a brush and isopropyl alcohol and re-assembled.
After 3 attempts to start, it was not recognized by any computer.
I tried to research but I did not have a chance, so I appeal to your guidance and advice.
Are you sure it was coffee grounds? Cockroach feces look like coffee grounds too.
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Old 04-14-2018, 01:56 PM   #4
alindumitru46
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Default Re: Corsair K70 RGB dead

Mehhhh...Nevermind....
I just said I cleaned with isopropyl alcohol. Right now I'll upload some pictures.

LE: little troubles with uploading...
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Last edited by alindumitru46; 04-14-2018 at 03:05 PM..
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Old 04-16-2018, 02:27 AM   #5
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Default Re: Corsair K70 RGB dead

Maybe start by checking wires between USB connector and keyboard's PCB. Then, when plugged into a USB port, make sure the keyboard is getting a steady 5V supply.
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Old 04-16-2018, 05:51 AM   #6
alindumitru46
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Default Re: Corsair K70 RGB dead

Yep, the voltage is 5V at the terminals on the keyboard pcb, unfortunately I studied too little the NXP LPC11U3X datasheet to check the voltages.
Besides, I do not have so thin terminals to risk measuring pins.
And there would be a VRM, or something like that ...
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Old 04-17-2018, 08:51 PM   #7
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Default Re: Corsair K70 RGB dead

If the power and data lines are okay, then next check the input and output voltages of that SOT-223 voltage regulator.

If good, I would take the entire PCB out and give it a good wash with soap (dish detergent) and water. The let it dry completely and try the keyboard again.
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Old 04-18-2018, 11:54 PM   #8
alindumitru46
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Default Re: Corsair K70 RGB dead

I would have wanted to sink the keyboard into such a solution and let it take some time to act on it, but I thought there might be some lubricant inside the contacts and it would be dissolved.
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Old 04-19-2018, 12:05 AM   #9
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Default Re: Corsair K70 RGB dead

Last night late, tired and in a hurry, I checked the VRM. It's a typically L1117S33 .
The measurements was made with both USB cables (keyboard and RGB) connected to the computer and the sockets on the keyboard's PCB.
The voltage on the input pin is ~ 5.1V, but the output voltage on the output pin quick tends to zero.
Hardly unpleasant ...
Is it relevant to measure the voltages only with the keyboard cable, ie without the RGB cable connected? Could there be any additional clue?
What happened and how do you explain that such a solid VRM can creep so easily?!

Last edited by alindumitru46; 04-19-2018 at 12:07 AM..
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Old 04-23-2018, 09:52 PM   #10
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Default Re: Corsair K70 RGB dead

Quote:
Originally Posted by alindumitru46 View Post
Is it relevant to measure the voltages only with the keyboard cable, ie without the RGB cable connected?
Yes, should be fine, unless the RGB backlight cable has some type of feedback (which I seriously doubt).

Quote:
Originally Posted by alindumitru46 View Post
What happened and how do you explain that such a solid VRM can creep so easily?!
It could be that there is something shorted on the output of that voltage regulator or it could also be that the regulator went bad (rarely happens, but not impossible).

If there is anything shorted on the regulator's output (you should check resistance from the regulator's output to ground with your multimeter), I would most likely suspect a shorted ceramic capacitor somewhere. Reason being is because ceramic capacitors like to become short-circuited when flexed or vibrated too much - something that isn't too hard to do on a keyboard PCB (think about all that slapping and hitting the PCB takes as buttons are pressed).

So if you do identify that there is a short-circuit on the regulator's output (I would say any resistance of less than 50 Ohms is certainly suspect), you should check the resistance of ALL the ceramic capacitors on the board. The ones that appear shorted should be removed until the shorted one is found (tedious annoying process, I know :\ ).
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Old Yesterday, 01:44 AM   #11
alindumitru46
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Default Re: Corsair K70 RGB dead

Thank you @momaka, I'll try to check today all this.
Yesterday I searched for a VRM L1117 and found a LD1117ST C413 but I'm not sure that it covers the minimum requirements for the replacement part.
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