Samsung 931BW - Takes Ages to Display

[danny2]

Re: Samsung 931BW - Takes Ages to Display

i already did dissemble the board and checked the puffy cap then assemble it back into my monitor.My model is exactly same as soreilly's monitor.
i worry these 2 cap 330uF and 1uF couldnt fit into my board,so i enquiry and search through all the forum.

[selldoor]

Re: Samsung 931BW - Takes Ages to Display

Well the smallest 1uf 50v is this one its only 4 x5 mm so should fit - not many caps are smaller than that.
http://uk.rs-online.com/web/p/alumin...itors/0116997/

[danny2]

Re: Samsung 931BW - Takes Ages to Display

oh well,thanks for the information.
i will go electronic shop to purchase these parts by tomorrow.

[Adzam]

Re: Samsung 931BW - Takes Ages to Display

Hi All,

Great Website!

I have the same problem with my power supply and the old CapXon Caps are not shown in their latest or older 2008 catalogue. Therefore I have no idea what the Ripple Current and Max Impedance (Ω) at 20℃ 100KHz should be.

The new CapXon 820uF size is too high at 25mm and the smaller option is different in Ripple Current and Impedance. Not that I want to replace them with CapXon ones as other members have advised better Brands.

I see that others have managed to find replacements for their Caps, but no one is saying what they actually used like a Part No. and some of the same caps have more than one Part No. or size.

Please can someone enlighten me as to what the best Ripple Current figures should be like is 1000+ Ripple Current better than say 500+ or - and what would the better Max Impedance (Ω) at 20℃ 100KHz be like is .07 or .071 better than a 1.00 + or - one.

I found some Panasonic ones FC and FK, but as yet can't find any FM or FR ones so still looking. The specs for the 820uF 25V EEUFR1E821 has a Ripple Current 2180mA. and the FC 1000uF 10V EEUFC1A102 Ripple Current 1050mA so I am lost as I would have been have expected the 820uF to be around 1460mA not 2180mA and the 1000uF 10V to be around 1010 to 1040mA not 1050mA although 1000uF is not to far off the 1010 to 1040mA.

Thank you for any helpful suggestions.

[budm]

Re: Samsung 931BW - Takes Ages to Display

Any FM/FR series will be better than the CrapOn caps. I use FM/FR/FC series for all my repair for years with great result.

[Adzam]

Re: Samsung 931BW - Takes Ages to Display

Any FM/FR series will be better than the CrapOn caps. I use FM/FR/FC series for all my repair for years with great result.

Hi budm,

Thank you for your reply.

Lots of interesting links to look at and I liked the photos on your site.

It would seem that heat is the worst enemy of these caps even the better Brands. I usually go for Panasonic stuff and had been looking at Sumsung but if they are using cheap caps in their products that sort of puts me off.

The Samsung Sync Master 931BW 19" Monitor was really nice and although I though I could smell burning sometimes I could never really find where it was coming from. It runs perfectly when it finally kicks in. I started to get lots of bad headaches which I have not had since I have been using new 24" Samsung HD LED Monitor. The LCD one uses about 40watts and I think the new one only uses 4watts plus the power supply is outside the case and feels pretty warm sometimes. I wonder what caps that has in it. Still be easier too replace as it only supplying low dc power to the screen.

Still can't find the caps I want at the moment, but still looking to see what is available here in NZ. Tried to order a repair kit from US but their site will not accept my Visa Debit card something about AVS (Automatic Verification System) saying my address and/or Zip Code details don't match what's on the card. I did see an identical IP board salvaged from new damaged products for $26US but it would cost about $30US for shipping and I can buy one hear for about $130NZ. That board had big Samwah mains cap, but I could not see what the others were, but they appeared to be a vivid blue colour and I could only make out a what appears to be 7XL or 7LX or something.

Kind regards

[selldoor]

Re: Samsung 931BW - Takes Ages to Display

Some members in NZ seem to use RS
http://newzealand.rs-online.com/web/...+25v&x=25&y=11


EDIT

Haha just read earlier post in this thread - I have no connection with RS
I have just herd good reports from other members.

[Adzam]

Re: Samsung 931BW - Takes Ages to Display

Some members in NZ seem to use RS
http://newzealand.rs-online.com/web/...+25v&x=25&y=11


EDIT

Haha just read earlier post in this thread - I have no connection with RS
I have just herd good reports from other members.

Hi selldoor,

Thank you.

I followed that link. The RS online Chat people are very helpful although when used that feature there was nobody there, but shortly after I got an e-mail back with an answer. So pretty good I think.

Interesting to see that the EEUFR1E821 25V 820uF and the EEUFR1E102 25 1000uF Caps have the same specs and are a suitable size i.e.


820uF 10X20 2180 0.020 10000 0.6 5.0 5.0 EEUFR1E821( ) 200 500
1000uF 10X20 2180 0.020 10000 0.6 5.0 5.0 EEUFR1E102( ) 200 500

The 820uF on my PCB is 10X20 so that is exact.
The 1000uF on my PCB is 10X16 but 10X20 should fit in.

Now I am wondering if I might just get 5 1000uF ones as I think they supply them in a pack of 5 and replace them all with 1000uF as the I think they where rated at + or - 20% or 30%. Hmmm perhaps not.

The 10V 1000uF will better off at 25V but it does not improve the 25V 820uF and the 35V one might be a little big at 10X25.

I will keep looking and see what I can find.

Kind regards

[Rtech]

Re: Samsung 931BW - Takes Ages to Display

The vast majority of electrolytics are + or - 20%.

[Adzam]

Re: Samsung 931BW - Takes Ages to Display

The vast majority of electrolytics are + or - 20%.

Hi Rtech,

Thanks.

Yes 30% would be a bit much. That would make it too easy. :-)

So is the 20% just for the uF or all of the other specs as well.

I don't know if I have got it correct, but I worked out that 20% of 820uF would be about -or + 164 difference so it could be 656uF and 984uF so perhaps I can't use a 1000uF in its place. The 20% on the 1000uF is I think about - or + 200 so it could be a 800uF or a 1200uF.

The Samsung replacement Power Supply for the BN44-00124H is BN44-00121H or at least that's what the Samsung Guy said.

I looked at the replacement board schematics and could not see any 680uF caps in it. Just lots of 1000uF 10V or 16V and 25V ones, but it could be a different designed circuit and it sure looks like a slightly different layout when see the two pictures of them. Sometimes they seem to use two same caps across the same area which makes me think that why use two caps when they could have used one or is there a good technical reason for doing that.

Kind regards

[Rtech]

Re: Samsung 931BW - Takes Ages to Display

The maths are obviously correct,and it is normal for Electrolytics, whereas other caps are different.It is quite normal that some of the caps are in parallel so the combined capacity would be accumulative,so qty 2 x 680uF,would give 1360uf,so it would be possible(and is done) to replace them with a 1000uf and 470uf,and that would be fine,as it would be well within the cap parameters

[Adzam]

Re: Samsung 931BW - Takes Ages to Display

The maths are obviously correct,and it is normal for Electrolytics, whereas other caps are different.It is quite normal that some of the caps are in parallel so the combined capacity would be accumulative,so qty 2 x 680uF,would give 1360uf,so it would be possible(and is done) to replace them with a 1000uf and 470uf,and that would be fine,as it would be well within the cap parameters

Hi Rtech,

Thank you.

Just looked at what I typed 470mF and I meant to say 820mF don't know where I got the smaller value from. Ha! I think I been looking at too many Capacitors.

I have not worked out how to edit my messages after the have been posted yet or even if it is possible.

Have build a few full wave PS but that was many years ago and these IP ones have a lot more extra parts to them. Besides I can assemble things from named parts, make meter measurements, but I don't really know the technical ins and outs to well. Did make/etched some PCBds for high voltage ignition for the old RX2 which work really well got a few jolts in the elbow a couple of time though. Ha.

D/L a schematic for the SyncMaster 931BW only to find it was a different layout to my one.

Might just settle for some average mid range rated Caps in the meantime and see if it works and then work on getting keep looking and see what turns up.

Kind regards

[braincrash]

Re: Samsung 931BW - Takes Ages to Display

Sorry to dig this up! But just to be clear, will the Caps with 25V be ok?

EEUFR1E821 25V 820uF
EEUFR1E102 25V 1000uF
EEUFC1A331 10V 330uF

Right?

[budm]

Re: Samsung 931BW - Takes Ages to Display

Higher voltage is OK as long as it is not too large to fit into the board and the cabinet.