Todays update has a problem
dog-man 2 May 2014
I just did an over the air update to my vuduo running openpli4 and now the box will boot up properly.
It will display the boot up channel but the display on the vuduo stays at restarting or a garbled version of 'reading usb' even though there is no usb to read.
The box is unresponsive and all I can do is power down and up with the power switch at the rear of the vuduo.
Is it just me?
Huevos 2 May 2014
My Duo often does that. It has ever since I got it. Nothing to do with any image in particular. Just switch it off and on at the rocker switch normally clears it.
Edited by Huevos, 2 May 2014 - 19:11.
dog-man 2 May 2014
Replaced the capacitor with a higher spec end of last year so unlikely to be that.
I have now managed after about 15 power downs and back on again to get it to boot up fully.
Panic over for now.
Erik Slagter 3 May 2014
Then probably this capacitor is going to fault any time soon as well (because you didn't add a ceramic capacitor in parallel, probably) or the voltage regulator itself is dying, because it has been stressed for a long time by a bad capacitor.
dog-man 3 May 2014
I don' recall ever seeing anything about this.
I just replaced one capacitor with a higher value when all I had when powering on was a red light.
dog-man...
WanWizard 3 May 2014
There's a design problem related to high frequencies that causes the capacitor to deteriorate prematurely.
The ceramic capacitor is there to filter those frequencies, if you don't add it you new elco will go quite quickly as well.
You should be able to find plenty here if you search for C807.
Erik Slagter 3 May 2014
BTW replacing the capacitor with a "higher" value won't help. If it's a higher capacity (more uF's) it may not even work and a higher voltage won't help.
Erik Slagter 3 May 2014
It actually not that important exactly what ceramic capacitor to use. Just use whatever you have lying around, anything with a capacitance of 100 nF or bigger, being a ceramic or a plastic C doesn't even matter (MKT, MKC, MKP...). As long as it's no electrolytic C, I wouldn't advice using tantalium as well. It has to do with "high" frequencies detoriating the electrolytic C, the non-elco will short these frequencies.
dog-man 3 May 2014
I replaced C807 late last year, so which number is the ceramic capacitor I should also change?
Erik Slagter 3 May 2014
You don't replace the ceramic C, you add it. Make the ceramic C short the elco. In other words, solder the ceramic C to the same points the elco is soldered to. For the elco, watch the polarity, for the ceramic (or plastic) the polarity doesn't matter.
dog-man 3 May 2014
So I need a ceramic capacitor and I solder it to the C807?
Can you give me exact details / specs of a ceramic cap I should get?
I can get one either tomorrow or Monday if I have enough time.
Erik Slagter 3 May 2014
Yes solder it parallel to the C807. Or actually, solder both the elco and the ceramic C to the points where the C807 was soldered originally. I can't explain it more clearly .
Like I said above, it's not quite important what value or type to use. As long as it's "solid" (ceramic, plastic). Capacitance about 100 nF or bigger, voltage > 12 V, that's all. It doesn't have to cost more than a few cents.
dog-man 3 May 2014
OK, Thanks. I will definitely do this when I can get one.
I have known about C807 cap failing for many years, but have never known about adding a ceramic cap also.
dog-man....
Pedro_Newbie 3 May 2014
But it can take a while before you get them
dog-man 3 May 2014
Order placed so hopefully within 2 weeks it will arrive all the way from China.