Re: Yamaha RX-V581 going into protection mode
Where/how would I find the rails?
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Re: Yamaha RX-V581 going into protection mode
I did some retesting - results attached. Main differences were with D2113 to D2116.
Bearing in mind SL seemed to work OK, and SR has 50v on it - does anything in those results leap out as wrong?...
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
Unfortunately, I never did. The amp lies dormant on a shelf taking up space, still.
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
Taking a different approach, if I were to power the unit on in protection override mode, what would be some useful points to probe for voltages at?
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
I have a bit of an update on this one. TLDR: Haven't got anywhere.
After leaving the opened amp on the kitchen table for countless months, I finally summoned the motivation and plan to try tackling this again - not for lack of interest, but ability/plan.
From page 120 of the manual, I listed every component that I could see as being part of the "SR" circuit. I then stuck my multimeter on each component that I'd listed. For resistors, I used ohms, and for caps and diodes, I used diode mode. For each...
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
I've done some probing around, using the attached page as a starting point. Measurements all taken with the unit turned off. Here's what I've found so far:
R2162 – 7.7k instead of 10k
R2156 – 84k instead of 270k
C2142 – 400-420
C2131 – 400-420
R2141 – 33K
R2113 – 33k
R2133 - 1200
C2106 – no short, don't remember value
R2106 – 1k
C2118 – no short, don't remember value
C2119 - 1960
R2121 – 1.8k
...
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
I'm able to get that reading because I'm using the protection mode bypass of holding down Tone + Info as I hold the power button to turn it on.
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
So I pulled the entire unit apart - detaching the heatsink and everything, only to see I didn't need to do that, and that here's a way to expose the underside and get a multimeter on everything. So I've put it all back together with the intention of strictly following the service manual to expose the underside and get some running voltages off of it.
And I don't know if this gives anyone any pointers as to where I should start looking, but I'm seeing -19.5v on the SR channel when sticking the multimeter on the SR terminals....
Leave a comment:
-
Re: Yamaha RX-V581 going into protection mode
Photo of the underside attached.
How do you go about getting it assembled and still being able to take measurements? Those resistors are under two boards so I expect this is going to be tricky....
Leave a comment:
-
Yamaha RX-V581 going into protection mode
Hi all,
I have a Yamaha RX-V581 which has started going into protection mode on startup. If I have speakers plugged in when powering it on, I hear a quick loud pop noise before it shuts off.
When putting it into diagnostic mode, the message displayed is DC PRT: 000. I took it into a repair centre, who after taking $120 to quote on the device, who said there's a DC voltage on the rear right channel. They also said it'd be another $360 plus parts to fix it, so as you might expect, I declined.
So far all of the work I've done with electronics so far has been...
-
Re: Samsung 192V goes black in 1-2 seconds
Maybe there's a bad CCFL.
Leave a comment:
-
Re: Dell P2210t two-seconds-to-black
As a follow-up - replacing the CCFLs fixed my two-seconds-to-black problem.
Leave a comment:
-
Re: Dell 2410b Monitor help
I think he means that, if one CCFL is faulty then the inverter will shut both lamps off.
Leave a comment:
-
Dell P2210t two-seconds-to-black
Hi all,
It's been a while since I received those boatloads of help fixing my Dell 2407WFP monitor, and, I'm back! This time, through the aid of the wonderful FAQs here, I've diagnosed the problem and not yet had to lift a soldering iron. Which is kind of a shame, I like soldering...
Anyhow, I recently acquired a faulty Dell P2210t from a client. It originally gained our attention when the backlight was subtly flickering. Dell, being Dell, refused to warranty it - claiming they couldn't see the flickering on the video they had insisted I record for them. So I decided to...Last edited by sabretooth; 11-28-2014, 11:08 PM.
-
Re: Dell 2407WFPb Monitor - Bad Cap
Thanks for the tip. I've removed Q601 for testing and will see if I can source another one. I've got another 8 0.22ohm resistors left, so it certainly can't hurt to try again.
But, using the advice from Adrian on page 4, I've done the workaround. And, well, with the help of an AC adaptor from an old HP laptop it works! Seeing the front panel circuit board light up was a very happy moment.
After I find another Q601, I'll try fitting it and report back with my findings.
Thanks for the tips and your time...
Leave a comment:
-
Re: Dell 2407WFPb Monitor - Bad Cap
Also, for interest's sake I replaced R615 and each time I plug in AC power both the fuse and R615 blow.
Leave a comment:
-
Re: Dell 2407WFPb Monitor - Bad Cap
OK, all looked to be in order. The various points had continuity, all parts back on/replaced etc.
Powered it on, and the fuse popped right away.
I'm guessing that the best route from here is just to do the external power supply mod described a few pages back. I'm out of ideas and knowledge on how to fix this.
Leave a comment:
-
Re: Dell 2407WFPb Monitor - Bad Cap
So, pin 6 has continuity with C613
Pin 7 - not connected. that was the one I was worried about. The surface scratching I did probably turned up nothing because there actually is nothing there.
Pin 8 - still has continuity with R603
I'll see if I can find some wire to solder through that hole.
Leave a comment:
-
Re: Dell 2407WFPb Monitor - Bad Cap
Alright, busy times but got some time to clean up the circuit board and take a photo.
I'm pretty sure I've ruined it! See attached....
Leave a comment:
-
Re: Dell 2407WFPb Monitor - Bad Cap
Hopefully this is good enough, then!
I've already tried scratching around to find the trace but haven't tried very hard and didn't want to push it in deeper or make fixing more difficult....
Leave a comment:
No activity results to display
Show More
Leave a comment: