Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

[DWChris]

I have a Samsung "BlinkMaster" 206bw with flicker of death. I have attached a picture with the caps noted. All are CapXon.

1. 470uf 35v
2. 1000uf 25v
3. 470uf 25v
4. 1uf 50v
5. 22uf 50v
6. 120uf 450v

I am looking at the caps in the attached excel document.

Have I chosen sufficient replacements?

Thanks,
-Chris

[Mr Bill]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

It should work but you don't need to replace the big 450v cap. I've recapped a few of these monitors and never replaced the big one and never had any issues.

[selldoor]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Whilst Mr Bill has already said you probably dont need the BIG cap the one
you have picked seems to have odd descriptions.
It does say through hole but it also says snap in.
The datasheet indicates only short legs so if it is a short leg snap-in
You would have to solder legs onto it or use the existing legs -cut off. One problem might be that they are often fatter than a normal cap so you would have to check the space available.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Yeah its the same as the last monitor I fixed just a different value. I cut the leads on the old cap and just soldered the new cap to them.

Thanks Guys.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Monitor fixed. Thanks guys This forum is great.

[tom66]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Did you replace the big cap? That can cause the blinking sometimes.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Yeah I just replaced them all for good measure.

[mockingbird]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Did you have to extend the leads somehow for the primary cap, or were they long enough that you could bend them into the hole? Because the one you picked is snap-in... Good choices otherwise... Parts you picked are top notch.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

I just cut the leads off the old cap and left them on the board then soldered the new cap to them.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

New problem I initially diagnosed it as bad caps. I replaced all the caps on it and it worked for a bit. Now I get a very fast screen flicker. I rechecked and re soldered all my caps and am still getting the same symptom. How should I proceed? leaving the unit on for a few minutes and it fades out completely and flashes on very dim every 5-10 secs. then after a few more minutes nothing.

[selldoor]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Do you have any spare bulbs an old monitor or laptop you can use to substitute bulbs.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

I have some bulbs I can pull from another monitor.

[selldoor]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

You do not need to pull completely down as far as bulbs -(easy to break) just try and get to the panel.
If the plugs are the same you can simply try one or two in place of the
206bw bulbs and see if the flickering stops/changes.
Have you tried reducing the brightness and changing the resolution?
What does the power light do when the screen flickers.

[DWChris]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Resolution change/adjusting brightness/ switching input from analog to digital does not change symptom. Power light is on solid like it should be in normal operation.

[Haggai]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

I intend to try fix my 206BW monitor in a few days. (It blinks, so I guess the problem is with the three capacitors marked 2,2,3 in the image in the first post)

Is it necessary to discharge any capacitors prior to desoldering/soldering the faulty capacitors?

If it is, how do you recommend I do that?

Thanks.

[selldoor]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Haggai - if the set has been un plugged for an hour before you start the caps should have discharged. You can check by testing across them with a multimeter set on
200 vdc. If they read 5 to 25vdc discharge them with a 1k or 2k 25w resistor. (Some just use a screwdriver! -less than 5v just go ahead and desolder it wont shock you.

[Haggai]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Thanks.

What about the other caps? Specifically the 450V one.
If I don't short it and don't desolder it I don't have to worry about it? Can't it still provide voltage/current to the circuit part I'm touching?

[Haggai]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Okay, never mind, I just measured the voltage across the capacitors, and none (including the 450V) had more than a couple mV on them. The 450V had 55mV, I guess that's safe...

[selldoor]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Yes - quite safe

[Haggai]

Re: Samsung "BlinkMaster" 206BW Screen Flicker, Requesting cap selection help.

Yayyy it worked!!
Now let's hope those Nichicons I put there will hold better than the CapXon that bulged...