Discussion in 'VuPlus Duo2 Schematic drawings, Pcb images etc..' started by bjt01, Nov 13, 2020.
does anybody know whats the value of R 122 , R 123 and R124 pls ?
It could be zero ohm resistors, but it would be better if you included the location as well, something like close to the Uxxx.
In any case, if you want to know, you should wait for tomorrow late afternoon. Because only then will I have the opportunity to measure it.
But as I see you have asked it also on the vuplus-images.co.uk forum and had given a picture with it, thus later more about the values of them.
it was someone from poland who asked the question on the other forum.Apparently they cannot register on this site.
THx in advance.
Ah, okay how nice of you.
But yes, somehow, some, could not register on this forum, but can read all the postings on the forum.
And I have no real idea why it is.
In that case when he/see like to register then it could sent a email message to me with the email and forum name it like to use, and then I, or also someone else could also create a account.
It will/should receive a email to activate it, and can afterwards change the password etc.
forgat : close to U822
Yes I saw it, and thanks.
In any case, he should wait for tomorrow late afternoon for these info.
Only then will I have the opportunity to measure it because then i'm in my repair cave.
We know something new?
Here it is...
R122=0 Ohm (zero ohm resistor mainly used for bridge or protection/fuse).
R124=33 Ohm (33.4 Ohms).
So the one that is missing from the photo is R124? And what should I look for in the store smd resistor with the parameters of 33.4 Ohms? Do I need any more data on this smd resistor?
This resistor is 33 Ohm and measured the 33.4 Ohms thus I would use an 33 Ohm resistor.
to see whats on resistor as code : http://kiloohm.info/eia96-resistor/51X
In fact, this copy also has a problem with white LED light. It does not start. He's dead like most of these cases. I decided to start the repair by replacing all the capacitors and I think it was a mistake.
There is a lot of knowledge on this topic and I have read a lot, but what would you suggest? What to check first? How to start checking vu + duo2? I got 2 Vu + duo2 for free and both have the same problem - white led.
What I always at first do is to check by serial and putty if there is any sign of life before thinking of a hardware issue
led white light error is probably due to many reasons. Vu is dead. The button on the front panel does not activate it. I think it doesn't make sense to check it if it recognizes the flash drive via usb. He's deaf.
Yeah i'm aware of that, but it's important to know if there is any sign of life which can bee seen with a terminal tool as putty or the older windows hyperterminal.
Suppose you receive some information from the receiver by serial output, then it may give some idea what it might be.
When you get no output in the terminal screen, then it's often a hardware issue.
I checked with this method by "putty" but if there is no voltage to the motherboard, not much can be done even after replacing the capacitors on the power supply board. Something showed there, but I didn't read the logs. I will do it again after replacing the capacitors on the motherboard. It will probably take time because I am waiting for additional tools.
I also did the putty tool, reading logs - rs232 after replacing the power supply capacitors. How do you rate this situation?
and will these resistors be correct?
Okay, so you have the Feeeee... issue and this issue is as far as I known never found.
In any case, tomeek.p had as it seems this same problem which you can read it on this topic.
We thought it was related to the U702 DC regulator, and later to the Nand flash chip, but both were not the case.
There is a thing which is never tested with these feeeee... error, and that is disconnect the front panel, and see if it makes a difference in the putty serial output.
Maybe also without the tuner(s).
I would test it, just to see if it makes a difference, it could in some cases help.
I think, not related to the Feeeee... issue, or maybe it may some fairy tale because I had read it somewhere a while ago, is to turn of the box, hold the front push button, or the one of the remote control, and switch on the box may give another output result in the putty serial output.
And otherwise, it could be related to some voltage issue, maybe you seen it already but I had placed some measurements of it in this topic.
In any case, I have not a real idea of what it could be, is it a cap issue, or a cpu or memory issue, or related to the nand flash chip or the voltages, or damage I/O connections to it, or is it some bad crystal, or at least frequency related?.
It's at least a issue that become more than you may expect, therefore I have the idea that it if it's has happened after a install, or reboot, or after powering it on a next day, it may be caused due another thing, maybe it's a flaw in the design of the motherboard, thinking of a cap, one which needs to be changed to a higher, or lower uf value.
In any case, I have never had this issue in repair, thus it's for me still a mystery of what it could be.
I want to ask you for help again. I'm still repairing the Duo2 motherboard. The problem is similar to the previous one, but this time it is not a resistor but a capacitor. I found no capacitor on the board. Designation C820. I attach a picture. Can you help me determine the parameters of this capacitor?
I'm not sure what the actual value is, but since it's connected to the center pin of the 1117 which is a output and already has a ceramic cap, I do not think it could make a difference when it's missing.
But often/normally it should be a 100uF and in some cases a 10uF with it.
Great. Thank you for the info. If I give 100 uF it will be safer if it should be 10 uF. Will such a reserve be too large in the case of replacing 10uF with 100uF. And you do not know whether it will be 16V or 25V and you will need the size number of this capacitor. Can you suggest anything else? thanks.