Sony str-DE435 Flash Protector

The receiver has a short in the audio output stage in at least one channel, the parts must be replaced to bring it back up to normal operation.

hello almbom
looks like the unit is going to self protect caused from malfunction of the amplification sector. mainly happens if speaker cables shorten or when speakers used with very low impedance, feel free to cantact for further help
regards

Relay click and Protect display indicates that receiver got problem in output amplifier section and most probably output chips got defective. This kind of problem is not user level repair and local repair shop will help you to get it fixed.
Thanks.

you have defective audio output circuit, like the other ones y might be the transistors or the drivers IC's (integrated circuit ) you need some repair skills to fix this problem.
good luck

This usually means an output transistor is shorted and the amp is protecting itself. There are usually 2 8 amp fuses GMA type (glass tube) that are located near the large transformer on the main board that also get blown. You can try the fuses and see if it fixes it (10% of the time it will). If they blow again, it will be one or more output transistors are shorted, and the unit will need professional repair.

You've blown it. It recognizes a potentally harmful situation and goes into protect mode.

Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

I have the same problemwith mine. the protector sign is on- I do not know why- and do not know what to do about it. Let meknow if you do or if you get assistance and I will do the same. My e-mail address is [email protected]

The only way to reset protect is to eliminate the problem which activated it. Problem may be insufficient line voltage or unit's output circuit. Have unit checked out by prof, tech