I have got a Sony HCD-BX7700dbi that isn't worth a lot but I'm keen to learn how to repair and would appreciate some help with my train of thought. The protection circuit is kicking in and the standby light is blinking. It goes into protection mode within a second of powering it on.

So far the relay on the power board that enables the main transformer clicks on and then off when powering on the unit. Looking at the schematics, the permanently enabled power rail called 'unreg sub' provides about 13.5VDC. Where the power comes into the main board on connector CN303, there is a diode...

Re: Antec TruePower 380p failed after intermittent supply, suspect MOV

The 22 ohms that I mentioned earlier was measured across this thermistor. Was it correct to measure it whilst in circuit or do I need to take it out? Is 22 ohms correct for this component?

Re: Antec TruePower 380p failed after intermittent supply, suspect MOV

Thanks for the pointer. A look at NTC thermistors does indeed show some very similar looking candidates. There is definitely a burnt smell from this NTC so I'm tempted to replace it anyway. There are also some domed caps near the output.

Hello,

I have an Antec TruePower 380p PSU that I had repurposed from a Sonata case. It had been working fine on a server in the loft using the Wake-on-LAN feature regularly until a couple of recent power outages where the power became very unstable - going on/off very quickly. There is now no output whatsoever from the PSU & fan isn't working. There was a pop when I attempted to turn it on.

Upon examination, it appears that voltage isn't getting very far so I believe the immediate issue is within the first stage. There is a green component that I am not familiar...

Re: New Members - please post your introductions here

Hello. I'm excited to be posting. I am a software engineer by trade but dabble with hardware occasionally. In the past I've recapped a Musical Fidelity amp with success and resusatated a motherboard just in time to be able to file my company accounts over Xmas (when all the shops were shut and so zero chance of getting a replacement at short notice). I've now got a couple of PSUs that I wish to delay from going to landfill so hope to sort those out.