I have a Yamaha rx-v373 receiver that does not power up. I checked for 120v ac coming in, and there is 120v AC going to power supply. The fuse is OK also. I don't have 120v ac coming off the connectors on the power supply that go to the big transformer. I get no voltage at all across the pins that are on the power supply, that connect to the transformer. I also tried to power the receiver up by pressing the on/off, straight, and tone control buttons at the same time. When I press these 3 buttons I can hear a relay click, but the receiver still doesn't come on. I am wondering if the problem is related to the power supply, or possible the main bd. if I wanted to try and replace the power supply, would anyone have a idea of what a power supply would cost for this receiver, and where I could purchase one ? Or, if I have to replace the power supply, do you think it's more practical to just buy another receiver ? Any input on this issue would be appreciated, thanks.
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Re: Yamaha rx-v373 power supply problem
Maybe this is a help for you?
https://www.badcaps.net/forum/showthread.php?t=32444 -
Re: Yamaha rx-v373 power supply problem
Perhaps this as well - someone does mention the thermal fuse in that thread but dont think it was followed up,
https://www.youtube.com/watch?v=1xIlqe-P1CM
At least it seems easy to test.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Yamaha rx-v373 power supply problem
Thanks for the advice, will work on receiver as I have time. Would you be able to tell me how to check the thermal fuse the correct way with a mutimeter ?Comment
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Re: Yamaha rx-v373 power supply problem
I can't view the you tube ( Yamaha rxv power problem repair ) on you tube. It is blocked and I can't view it. Would you be able to tell me where the thermal fuse is located on the transformer ?Comment
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Re: Yamaha rx-v373 power supply problem
This is from the youtube video:
Set your DMM to ohms, and check the grey and blue wire, if there is no reading the primary coil could be damaged.
Most likely it's the thermal fuse not the coil, although it is hidden in the transformer. You can bypass the blown thermal fuse, but you need to cut the wires as shown in image 2. You cut the blue wire just before it enters the transformer (circled in yellow).
Solder a new thermal fuse, in the video he bends the thermal fuse and inserts it into the transformer shown in image 4.
After you soldered the fuse, check the blue and grey wire with your dmm, it should show 6 Ohms.Attached FilesComment
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Re: Yamaha rx-v373 power supply problem
What's the fuse rating and or p/n?
Are you able to remove the old one or is it perminately installed?Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
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The screen seems to blackout and stay black, but with a flashlight I can see the display.
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Assuming... -
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One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
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Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
Hello Everybody,
Trying to repair a power supply from a Russound CA4 Multizone Controller (picture attached)
Russound no longer supports it but were kind enough to provide a schematic of the power supply (pdf attached).
The outputs marked 12v and 20v are all measuring only 1v.
The board is clicking, which I think means it is in something called hiccup mode when the flyback transformers switches because of an internal problem or something else on the board Overloading it.
The capacitors physically look clean (no bludgesor leaks) and...
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