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Help! With troubleshooting SMPS for a Denon reciver. (Low output voltage)

23komma4

Mar 16, 2019
1
Joined
Mar 16, 2019
Messages
1
Hi,

I'm trying to fix a power supply for a denon reciver, AVRX2100W, but now I'm stuck.

At first, the AC/DC converter (MAG258MG) had blown, so I replace that along with some diode's, see attached picture.

When measuring the output voltage I get 1V, and it should be 5.2V.

Any ideas on what could be the cause on the voltage drop? Thanks!
 

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Martaine2005

May 12, 2015
4,891
Joined
May 12, 2015
Messages
4,891
@Ferdi57 said to check the zener diodes.
He built a zener diode controller to speed up smps repairs.
(Google translate).

Martin
 

KilgoreCemetery

Apr 12, 2017
258
Joined
Apr 12, 2017
Messages
258
I'm no expert when it comes to this sort of stuff (read noob), but from what I understand, the optocoupler is supposed to regulate the amount of voltage that the SMPS puts out. If it's reading wrong it could throttle the output. Something like a bad zener mentioned above could certainly cause it
 
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