Question about Yamaha HTR-5940 Receiver

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Yamaha HTR-5940 won't stay on after thunderstorm

Hello,
I have a Yamaha HTR-5940 that was working fine.
There was a thunderstorm in the area and a nearby lightning strike.
It blew a Mitsubishi 55" TV and Yamaha HTR-5940 receiver. TV is being repaired.

Initially, the HTR-5940 got power to the front panel for about 2 seconds, then it clicked and turned off.

The click was coming from a small black box on the board that also connects the power cord. The black box is right next to the two fuses. The black box is about 1" tall by 1" wide and 1/2" deep.

The box has the following on the top:

DLS1U
12VDC 0.25w

c RU usTV-8
5A/100A
3A/120A
250V~

DEC A
CY51 CHINA

This box clicks when the power button is pressed to turn it on, and then it clicked again when the unit shut down about two seconds later.

After identifying the click, I unplugged the power cord from the wall. I then disconnected the transformer from the circuit board. I then plugged the power cord back in and tried to get a reading from a voltmeter at the transformer pins. I'm not an expert with a voltmeter, but I connected the red and black leads according the voltmeter's directions. The voltmeter stayed at zero.

I then unplugged the power cord again, and then removed and inspected each fuse and returned the fuses to same location. Both fuses are good.

I then attempted to remove the black box, but I couldn't get the clips to release with the small screwdriver I had. I gave up for the evening, but pressed down on the black box to make sure it was seated properly.

The next morning I turned the receiver on, and was surprised that it stayed on. I then unplugged the receiver, and connected an optical cable to the optical connection labeled DVD. I also connected an analog cable to the CD input.

I connected a pair of speakers to the front A channel only. Plugged the receiver and DVD player in and turned them both on. I played Super Speedway in the DVD player.

I changed the input to DVD and it indicated a Dolby Digital signal and the speaker symbols for all six channels were lit. There is crackling noise when the volume knob is turned. Some sound came out, but the volume was very low and and did not change when the volume knob was turned up to max volume.

I changed the input to CD to test the analog connection. Same result.

I then turned the power off, and changed the speakers to the surround channels and tested it again. No sound when there should have been sound. I turned the unit off and connected the center channel. No sound when there should have been sound.

Thank you for your help.
Terry

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I have the same problem as you but no thunderstorm. Mine happened after I connected speakers with the unit operating and had a speaker wire short at the back of the unit. Got a whiff of smoke and now I have that DSL1U unit clicking same as you. Did anyone suggest a fix?

Posted on Apr 04, 2010

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