Question about Sony STR-DB940 Receiver

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Sony STR-DB940 has no output

Gutted!! My beloved amp suddenly decided to stop making any noise :-(   
When i turn it on, the mute and volume indicator (red LED on volume dial) flash for around 5 seconds, then it stopps and appears to be ok. No sound though!?!
I pressed a few buttons and the flashing started again, then stopped. I changed mode, (input selector) and the same again. No sound from it at all. 
When i turn it off, the mute and volume indicator keep flashing, then just stay on. I had to turn it off at the mains to get them to go off...

I've tried leaving it off under the A/C for a few hours incase it had over heated diring a particularly hot day, no diffence.  
Any advice or even a solution or diagnosis would be gratefully received
Thanks
Tom

Posted by on

  • fatboy14 Jan 15, 2009

    Have the same problem for the 2nd time. First time it was repaired under guarentee by Sony in The Netherlands and was returned without a report. I live in Spain now and have the problem again. Brought the receiver to an authorized Sony Repair Center. They claimed the digital module (top middle board) is defective and should be replaced for around 350 euro. Did not go for it 'cause you can buy a good new one for that price or for less a second hand DB940 for spare parts.

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SOURCE: Sony STR DB-930 Receiver jumping into protector mode

I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.

Re Assembled unit and it worked OK.

I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.

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Have you connected an extra pair of speakers?. (Thereby loading the amp stage beyond it's capacity)
Are the speakers connected to the unit the original ones the system came with or different? ( Speaker impedance, usually displayed at the back of the speaker cabinet must not be less than amp's specifications....6 ohms, 8 ohms)
If you're driving the unit excessively you're lucky this piece is equipped with protect mode, else your speakers and amp would have been fried by now.
One last possibility comes to mind: High volume causes vibration causing loosely fitted mains plug to rattle in wall socket calling "protect" due to improper feed voltage. Move the unit to another wall socket and ensure a tight fit into mains receptacle.

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SOURCE: Sony amp str-db940 - protection

Somewhere in your speaker wiring, you have a shorted wire. This short can be as simple as a single strand of wire touching the other terminal on one of the speakers.

With a bright flashlight, look carefully at the back of the receiver and then the speakers for any loose strands.

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Check 470 uF 450 V in the power supply. I don't know if the chassis is the AE-5, but I had a similar case and the capacitor was bad.

Please tell me if it worked.

e-mail: jlopes.electronica@sapo.pt

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Ths 5 blinks usually indicate an AKB problem. There is a break in the video path. I'll look up your specific model and post the results here. Please update this if you wish to attempt the repair yourself.

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Posted on Mar 19, 2009

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1 Answer

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