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SONY AV Receiver STR-DH720 Won't Power up

I have a SONY STR-DH720 that won't power up. I have changed the fuse still nothing.


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Which fuse did you change?

According to the wiring diagram there are 7 fuses associated with the power input. Fuse numbered 901 in the power input transformer primary circuit and 6 fuses numbered 910-913 and 940-941 in the power input transformer secondary circuits. Scroll to section.5-6 Block Diagram Power Key section in the service manual.

There may be more that have to be replaced. Be aware though, a fuse usually blows for a reason. If only one other has blown knowing which ones were blown will hopefully isolate the problem to a particular power supply voltage level of the receiver.

Here is a link to the service manual for your receiver. It has all the relevant information usually found in a service manual such as wiring diagrams, part numbers, disassembly procedures etc etc

When you get to the link, below the Document preview box is a sentence which says This file is downloadable free of charge -... processing. When it changes to This file is downloadable free of charge - ...Get Manual click on the Get Manual and the download will commence.

Safety Notice:

Always disconnect the power from the receiver by unplugging it when working on it with the covers off as there are lethal voltages present. If in doubt, don't

Hopefully this is of some help.

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