Re: Pioneer VSX-3300 Receiver Wont Power On
Ok, so it doesnt look like Im getting the correct voltages at the ribbon cable that should have at least 5 volts, Im not sure which leg of Q551 is the emitter, but I tested at all three legs and none of them are showing around 5.6 volts, they are testing at 2.7v, 2.7v, and 3.4 volts, btw, Im assuming these are DC measurements? not AC voltage? Or am I completely wrong.....
Also, here's a couple of quick videos of what im working with and how Im testing...
https://youtu.be/1BmHXqOzzrg
and
https://youtu.be/MG6TrXVZsWQ
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Re: Pioneer VSX-3300 Receiver Wont Power On
How are you measuring 11V, 11V is typically sufficient to engage a 12V relay,
Are you getting +5V to the system (J9 pins 1 and 2, or at least +5.6V at the emitter of Q551)?Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
the diagram shows a 15.7v point that feeds the relay.... what are you reading there and how are you measuring that point?
Also the "5v" point comes off that area too.... what are those measuring? A good chance that the caps (c552) is bad..... maybe.
Can you check that with your meter (cap function).Last edited by budwich; 12-29-2021, 10:35 AM.Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Ok, I can definitely be more specific. It seems totally dead, but it has 120v power, and I can follow that 120v power to a relay assembly board inside, which seems to go through a small transformer and I think should turn on a relay, which powers the rest of the board. I have attached a picture of the relay assembly diagram, which I think is where at least some of the problems stem from.
It looks like the small relay on this relay assembly board is a 12v relay, I assume it should be getting around 12v from the transformer to trigger the relay and turn the unit on....It looks like it's a bit low to me, around 11v, As a side note, I also jumped/shorted out the contacts on the relay and I was able to get the unit to turn on with the power button, so something is preventing this relay from changing state......again, any help is appreciated, and I can do more testing and/or checking, with guidance of course...Attached FilesLeave a comment:
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Pioneer VSX-3300 Receiver Wont Power On
Have a colleagues Pioneer VSX-3300, it wont power on, hasnt for a number of years, but just now trying to figure out what's going on with it.
It has 120V input and I have followed that 120V to a small board that appears to have a small transformer and a relay among a few other components I dont think the relay is changing state which I believe turns on the receiver, but this is all speculation.....
I have downloaded the repair guide, which I have attached to this post, but I am having a hard time following it.... Can someone please offer any advice on what to check? Im pretty proficient with a multimeter and am good at soldering as well, so im not afraid of taking anything out of circuit to check if needed....
Any help is appreciated.
Thanks!Last edited by thetonywarren; 12-28-2021, 01:31 PM.
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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.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board
Found shorted diodes on main controller relays there are 3 of them that... -
Hi All,
First time posting here ... my name is Kevin but my friends call me Journey.
I have a Samsung 75" LCD model UN75RU8000FXZA that I don't remember the original fault other than it wouldn't power up anymore.
After it sat for many month's I decide to look at it again. The motherboard seemed to have power regulation issues. After much fussing I decided to just get a new MB.
It came a few days ago and I installed it now just cycles the power relay on and off ... when on the backlights light up and then dim and then relay kicks off and the whole things starts again....
Leave a comment: