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Low signal strength on vuduo

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Re: Low signal strength on vuduo #41 soupalonion

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Posted 14 April 2015 - 21:33

So the VuDuo is built by crappy (low quality?) capacitors, first C807 and now C848.

 

Lucky me for selling it and buying the Duo2 (I wonder what will suck in Duo2..).

I'm not 100% sure that all the vu+ duo are concerned, but i guess this is an issue on certain series of vu+ duo... as you can have this kind of issues on some TV, laptops or smartphones.
I bought my vu+ duo in May 2011, so far so good... never had to change a component on it (crossed fingers -_-)
Since 2011, the receiver works 2-3 hours a day
(its not that much) but till now, no problem.

 

vu+ duo 2 seems a good choice, and transcoding option is really a + B)



Re: Low signal strength on vuduo #42 dog-man

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Posted 14 April 2015 - 21:38

Capacitors are a cheap fix though although a little inconvenient to have to replace them.

 

I was on the verge of buying a vuduo 2 to replace my old vuduo for around £300, but instead have my old vu working perfectly again for 0.74 pence and a little time.



Re: Low signal strength on vuduo #43 Plineo

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Posted 29 April 2015 - 16:26

Hello dog-man, I have the same problema as you on my VU+ DUO, could you please tell me where is located the C848 on the motherboard? Did you replace it with the same one model or other? Thanks!



Re: Low signal strength on vuduo #44 dog-man

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Posted 29 April 2015 - 16:48

I can't recall exactly where it is, but is clearly numbered and on the main board.

 

Use a magnifying glass to find it if your eyes are not good enough.

 

I replaced it with a 220uF 85c 16v.

 

It's a slightly higher rating than the original and much easier to source.



Re: Low signal strength on vuduo #45 dog-man

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Posted 29 April 2015 - 17:12

I seem to recall that it's not very far from C807 (Red light problem) if I have remembered the number correctly.



Re: Low signal strength on vuduo #46 Bag58

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Posted 29 April 2015 - 17:37

You can do a search for C848 on the forum, and will find a link to a post on another forum explaining it all. The C848 does not cause the same problem as C807 (the red led problem), but when defective it causes a low signal strength. The C848 is 1000uF.


Edited by Bag58, 29 April 2015 - 17:39.


Re: Low signal strength on vuduo #47 dog-man

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Posted 29 April 2015 - 17:44

I can't recall exactly where it is, but is clearly numbered and on the main board.

 

Use a magnifying glass to find it if your eyes are not good enough.

 

I replaced it with a 220uF 85c 16v.

 

It's a slightly higher rating than the original and much easier to source.

 

 

 

Ooops. Ignore this post. I picked up the wrong bag of capacitors.

 

It is as follows: 1000uF - 16v - 105c.

 

That is what I used and fixed my problem. (Not the red light problem).



Re: Low signal strength on vuduo #48 Plineo

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Posted 30 April 2015 - 07:34

You can do a search for C848 on the forum, and will find a link to a post on another forum explaining it all. The C848 does not cause the same problem as C807 (the red led problem), but when defective it causes a low signal strength. The C848 is 1000uF.

 

 

 

I can't recall exactly where it is, but is clearly numbered and on the main board.

 

Use a magnifying glass to find it if your eyes are not good enough.

 

I replaced it with a 220uF 85c 16v.

 

It's a slightly higher rating than the original and much easier to source.

 

 

 

Ooops. Ignore this post. I picked up the wrong bag of capacitors.

 

It is as follows: 1000uF - 16v - 105c.

 

That is what I used and fixed my problem. (Not the red light problem).

 

 

Thanks!

 

I got it! It's close to the C807, which I already changed a year ago, but that was easy to change, just cutting the pins and solderinh the new one over the pins, but the C848 is very difficult! How did you change it? I have a desolder,  but don't know if I can desolder those solderings over the mainboard...

 

I have found in other formus this note:

 

"VU + Duo Weak signal, no signal hd channels I gradually weakened until he could no longer watch tvn hd. and other HD Channels

4.Namierzyłem and replaced the capacitors listed below. Certainly not all are responsible for the good reception, but had underestimated the capacity by almost half, and elevated esr-effect pioronujący everything works as Nówka tuner alive on nowo.Znowu have hd channels.
C812 1000uF/10V
C819 1000uF/10V
C848 1000uF/10V
C816 220uF/16V
C843 220uF/16V
C860 220uF/16V
C264 220uF/16V"


Edited by Plineo, 30 April 2015 - 07:37.


Re: Low signal strength on vuduo #49 dog-man

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Posted 30 April 2015 - 10:28

Yes. not enough room to just snip the legs.

 

I gently swivelled the capacitor left and right, over and over until the legs separated from the body of the capacitor. I then snipped them a bit shorter and soldered the new one to the legs.



Re: Low signal strength on vuduo #50 Plineo

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Posted 1 May 2015 - 13:24

I can't believe it...it works! I have changed the C848 and now signal has increased from 66% to 78%, HD channels now open perfect and a few channels that didn't work now work like a charm! Thank you all very much, I was almost thinking that I have to buy new vu....and now a 25 cents component has change it all! :D



Re: Low signal strength on vuduo #51 kaffekop

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Posted 15 January 2016 - 16:26

Fix HD channels by change the C848

 

we almost need a small WIKI for the problems that we have with our old VU box



Re: Low signal strength on vuduo #52 vma

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Posted 25 October 2016 - 19:32

Hi,

 

Just to let you guys know that I had the same Problem: less and less channels received. First I thought ot was cables or LNB and changed them all. Then it still wasn't working, so I tested with a meter (doh, could have done that in the first place, but to my defense, the cables were corroded, too).

 

At the end I had to change C848 and C819 and the VU+ DUO is running fine again! Changing just the C848 did not fix the problem.

 

My guess is, that one should change C848, C819, C852 and C837. They all mess with the reception and if one goes bad, the other will probably follow soon.

 

Regards,

Vitor



Re: Low signal strength on vuduo #53 dog-man

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Posted 25 October 2016 - 19:36

Nice post. I was on the verge of replacing my vuduo. I shall try this before I make a final decision.

Although my vuduo is better now, there is still clearly a problem.



Re: Low signal strength on vuduo #54 dacorsa

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Posted 5 September 2017 - 15:39

thanks for all your info, i have change all condensator and now my vu+duo is alive!

 

see you







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