Belinea BT 10003 (Buzzing) - what change?

[robertg]

Hey, I have the same display than in this thread:

The display works OK (picture is there, just flickers a little bit), but there is disturbing buzzing/noise which gets louder with increasing display brightness + there is a little bit strange smell at the back cooling slits.
I think it comes from the bigger board.

I already teared down and made pics and think that I identified at least 2 bad caps.
Shall I just replace them - or do you think their failure are caused by another thing?
Furthermore I noticed on the backside of the bigger board an area wich looks a little bit like burned (slightly darker/browner).

Any hints what I should check before replacing the 2 caps (marked red in the pic)?

Do you need better quality pics?
Cheers, Robert

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

Yes those are defective on the power supply, and your should also change the 3 greenish ones. I personally would also change the large black one too.
On the other board , you also have a bunch of them that are bad and that should be changed.
the dark area is from heat caused by the diodes on the one heatsink. They probably should have made the heatsink larger , but they did not , so some of the heat stayed at the board.

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

Thanks for your kind answer!

small board:
- Can I replace the bunch of defected of the small board (330uF/16V) with 330µ for 25V (because of lack at my favorite online shop)?

power supply:
- Why you would also change the big black (120uF/400V) although it looks not demaged?
- Why the 3 greenish (2x[220uF/25V], 1x[47uF/50V])?

- I identified also a demaged with the black heat shrink tube at the left middle (directly under the question mark in pic2) (1000uF/25V) and will change it


Any further advice before I trying if the display works better after replacing bad caps?

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

330 x25 should be okay and I would change all the purplish/brown ones on that video board. These are CapXon brand and they are garbage !!

If you feel lucky and don't want to change those other ones while it is apart , That is up to you, but since the others failed, that means the others might be going soon, so if you want to take it apart another time when these go just to save a few dollars right now, ok.

[mariushm]

Re: Belinea BT 10003 (Buzzing) - what change?

You will need to replace the capacitors with LOW ESR capacitors of same capacity. The voltage can go higher. You can't use any capacitor with that capacitance, it has to be low esr.
You won't find "low esr" capacitors in shops, because this "low esr" term is relative. Get the manufacturer and series then look in datasheets online and if it says "low impedance" they should probably be OK.

Replace the Capxon capacitors on the board with the vga and audio connector.
If you're cheap and you don't use the audio on the monitor, you may get away with not replacing those 4 capacitors by the audio jack, as all those four are used by the audio amplifier and the speakers.
If you don't replace them, you may eventually damage the built in speakers unless you mute the sound from the OSD menu.

- Why you would also change the big black (120uF/400V) although it looks not demaged?

It's his personal preference. I wouldn't replace it. They're a bit harder to buy and they're expensive, so my advice would be not to bother with it.

- Why the 3 greenish (2x[220uF/25V], 1x[47uF/50V])?

Those capacitors have an important role in how the power supply starts and works, in general. If you look at the board, you can see that it's much darker in that area, where the transformer is.
The board got darker because it overheated, a lot. As the capacitors went bad, the power supply started to not work so well and due to this behavior, everything heated on the board. You just can't tell how much heat that small capacitor near the transformer absorbed through its leads and since it's so small it doesn't have a vent on top to be swollen and become visible to you that it's bad. As that capacitor is used each time you turn on or off the monitor (and I think even when it goes in stand by), it's quite important and you should replace it.

It doesn't have to be rated for 50v, you can probably use a 35v or a 63v or even a 100v rated capacitor there, they just used 50v because anything rated for less voltage isn't cheaper in general, and because the larger size of the capacitor makes it more resilient to heat and other things.

The other two greenish capacitors (2 x 220uF) ... the board is not looking good close to them but even so.. i would probably think a bit before replacing them. I'd test them with an ESR meter before replacing.
As you don't seem to have an ESR meter, it's probably safer to just replace them, as long as you buy stuff and use the soldering iron.

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

I just noticed another small cap in shrink wrap at the tip of the largest capacitor

the EXPENSIVE large cap
this is one model that Farnell has for £3.28
400BXW120MEFC18X30

It might be available in your area ??

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

Hey guys, thanks for all your helpful answers.
I placed the order for the caps (all LOW ESR, 5 EUR in total) and will be back next week, when I got it.

After replacing I will tell you which ones I replaced and ask for any further advice before assemble the display again.
For the large one I took this, hope it is right (although it is "snap-in").

And the cap with the shrink tube at the tip of the biggest: the shrink wrap is still OK, not shrinked, so I think its OK, isn't it?
OK, I could change ALL, that's right....

So long have a nice weekend!

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

the link to the German parts site does not go to an actual part.
Snap in will work but you will have to solder it to the wires that are on the old capacitor

The shrink wrap means nothing as to if the capacitor is good or not good

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

Hey Guys,
I have got the replace caps and took the soldering tool.

Now I replaced all caps which I marked in green.
(If I find three more of the 330uF tmrw, I will change also the three missing at the VGA board - otherwise it stays like this.)

Before I try to switch the display on again after re-mount:
Shall I check anything else??

Thanks for any further advice and all help until now!

Cheers,
Robert

[Clutchbox]

Re: Belinea BT 10003 (Buzzing) - what change?

Pls upload pics of the boards of the new situation after the cap replacement.

And yes, those 3 leftovers (Capxon GL i think?) on VGA board need also replacement if you want to do it right.

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

If you want input, it would help to see the board after the install from both sides
don't be shy, we won't critique your soldering unless a spot looks like potential trouble

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

No, not shy. But perfect is just another word for my amateurish results ;-)

At some places I had to try quite long, but finally I think I could fix all contacts properly (at least mechanically all are fixed!).
The snap-in I made with some wire, as well as the 2200uF because it was taller than the defected one.

What do you think?

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

well, I am going to recommend some fine tuning.

did you use separate flux or just flux core solder ?
If you used just flux core solder, there is usually not enough flux in there to get solder to flow nice.
If you used separate flux, maybe your iron was not strong enough.
Some could use reflowing of the solder which would mean add flux to what you did and reheat them so the solder flows together better.
If you iron isn't hot enough, preheat the board as hot as you can with a hairdryer. that can help.
On the main board is where my concern is since some of the solder pads there are really small rivets and the other trace is right next to it.
if you look at a cap that you did not do, you will see what I mean.
Those cap pins should be straight up and the solder shouldn't go out past the trace.

you should trim the length of the extra leads a bit shorter because they may get to close to the metal frame of the monitor.
If you had installed the one capacitor straight up, I know it was taller than the original, but would it still have fit inside the unit without touching metal ?

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

- The tall cap wouldn't fit without touching metal or not making the fixing screws fitting at all
- leads cannot connect metal because of a separate plastic cover in the monitor (but will look how I can shorten)
- I did use additional flux (but maybe it is not the newest ;-) )
- I will reheat with some more flux and will see if I can improve it
- I think I did not touch any neighboring rivets - so it is just cosmetical?

Then - if you don't have any more serious concerns - I can give it a try?

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

ok
I did not see much flux residue, so It didn't look like extra flux was used. I guess you cleaned it well.
plastic shield works to a point but a sharp rubbing pin can eventually wear through and arc
just recheck those few things and fire it up

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

Now, after making some soldering-spot-improvement, I mounted the display rough-and-ready and gave it a try!
And: It works again great!!

I can use it with maximal brightness without any noise now.
The flickering at the VGA signal also vanished.

I will change in one week the three remaining caps of the VGA board when I got the replace caps.

Just one thing: When the display is switched off but still the power cable is plugged-in I can hear a very week peep/noise. Just 5 seconds after removing the power cable it changes the tone and dies.
Normal behavoiur of not up-to-date-displays?

Again very much thanks for all your help - and until the next thing to repair ;-)
Cheers, Robert

[robertg]

Re: Belinea BT 10003 (Buzzing) - what change?

So, I think hopefully my last post at this thread:

I did change the last three remaining Caps (330uF) at the VGA-Board and now tested it for two complete days:
It works now like a charme, without any flickering or buzzing as it did before.
So I would say repair acomplished successful thanks to your help, 10 EUR of spare parts and 3-4 hours work.

One last thing, just to be sure:
- After running it for some hours at max brightness, the top of the display becomes quite warm (I guess it is the lightning parts, but from the board also comes some reasonable heat, but it is still safe to touch at the plastic housing!), much warmer than my more recent display nearby (Benq G2200W - it is just the not up-to-date components?)
- Power consumption of the BT10003 is now between 38/16Watts (max/min brightness), where in a data sheet (of the EU ENERGY STAR) I found 34 W is depicted

Are here any concerns about the heat and the power consumption, that anything is still not right at the board? Or can I throw my doubts away?

Again thanks for this project!!
I will definitivly recommend this forum to all DIY-guys!
Cheers, Robert

[bammbammfran]

Re: Belinea BT 10003 (Buzzing) - what change?

They all run hot
Usually in the 130-150degree fahrenheit range
Part of the reason that they fail.
The top of screen heat is a combination of the top bulbs and the fact that the internal heat rises.
If the rear case does not have vents, you may want to add holes across the top to let some heat out and some at the bottom to let room temp in. This will help it last longer
a small fan shoving air in would be even better

[bomcla]

Re: Belinea BT 10003 (Buzzing) - what change?

the video card the monitor changes also large capacitors, the photos look puffy under 2 and 3 above photo