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fab067
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Posts: 1
Joined: Mon May 17, 2021 7:22 pm

RB450G power supply trouble

Mon May 17, 2021 7:37 pm

Hi,
I bought a RB450G on Ebay. It starts without any problems the first time, I could setup IP address for ETH1 with Winbox, all OK.
But I shut off the power supply and restart it a few hours later.
It doesn't start anymore, and I can hear a small noise near to the big inductor.
I took voltage measurement around rt9206 and 9960GM Mosfets and found 1V on L803. I think I should find 3V3.
I found only 5V on pin2 of RT9206.

Any idea ?

Thank you
Fabrice
 
jebz
Member
Member
Posts: 366
Joined: Sun May 01, 2011 12:03 pm
Location: Australia

Re: RB450G power supply trouble

Mon May 24, 2021 3:45 am

If the RB450G is old it may have faulty electrolytic capacitors. Sometimes they have bulged tops or bottoms and there's discoloration due to electrolyte leakage.

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