Re: BN44-00195A strikes back!
CM802: 2.2nF (0.0022uF) 1KV Ceramic, 5 or 10% will be fine.
1KV: http://www.digikey.com/product-detai...977-ND/4457545
I would go with higher Voltage rating:
http://www.digikey.com/product-detai...183-ND/1021831
CM809: 47pF 1KV Ceramic, 5 or 10% will be fine. This one is hard to find. EBAY?
BTW: CM812 (12nF (0.012uF 630V special cap, Blue rectangular) is also know for common failure causing no 24VDC.
http://www.digikey.com/product-detai...2113-ND/585180
800V rating:
http://www.digikey.com/product-detai...256-ND/2179293
BN44-00195A strikes back!
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BN44-00195A strikes back!
(For any mod/admin: if you think that a new thread is not appropriate, I apologize in advance and feel free to merge the post in any other BN44-00195A thread).
So, I'm a new victim of this power board. I was minding my own business in front of my 245BW, when POP it went, with a nice smell of (probably) burned caps. I started to search infos on the web, and luckily the mighty Google pointed me here on this (great, I have to say) forum.
I read most of the threads about the power board and its fallacies, and proceeded to crack open the monitor and check the board. As you can see by the photos, I guess the CP801S is dead, so I started to make the list on an online italian shop for all the caps: if I need to change one, why not all. I must rely on an online shop since, where I live, there's no electronic component shop available, so, before completing the order, I'd like to ask some more things to you just to be sure I'll not need another order (and more shipping costs) after the first.
IIRC, this is the list of all the caps that I need (the link is for reference, I tried to choose Panasonic/Nichicon/Wuerth caps with the same physical sizes as the originals):
CP801S - 82uF 450V 105° 30x20 -
CM806/CB809/CB812 - 47uF 50V 105° 6.3x11 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CM851/CM852 - 1000uF 35V 105° 12x20 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CB853 - 2200uF 10V 105° 13x20 - http://www.conrad.it/ce/it/product/1...78009?ref=list
CM857 - 1000uF 10V 105° 10x12 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CM855 - 470uF 35V 105° 10x16 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CB804 - 22uF 50V 105° 5x11 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CB805 - 2.2uF 50V 105° 5x11 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
CP804/CM814 - 10uF 50V 105° 5x11 - http://www.conrad.it/ce/it/product/4...-1-pz?ref=list
This was the easy part. Now comes the hard, where I need really your help.
While removing all the goop from the board, two ceramic caps broke, the CM802 (the blue one on the right of the CP801S and south of the two MOSFETs) and the CM809 (to the right of the MOSFETs). Problem is, the goop is on the codes, so I have no idea what kind of caps I have to buy in order to replace them.
Same goes for various resistors, I can't quite ascertain the right values of them since some color bands aren't very clear under the goop, and moreover I have no idea which is their maximum power dissipation.
Keep in mind that I have a digital multimeter (with no ESR though) and an old 11W solder, which proved to be ineffective in removing the solder from the PCB (I think I'll get a Basetech ZD-30B kit, which is a 30W solder, I guess it should be enough, but feel free to correct me if I'm wrong), so far the only resistors that I managed to remove and measure are the RB801 and RB802.
So, about the resistors:
RB801 and RB802: it seems that they're both 100k ohm resistors with 5% tolerance; tested them after removing them from the board, got readings of 98.3k and 98.6k
RB801S: I guess it's a 33 ohm (tested on the board, and that's the reading, 33.2), but I can't understand the tolerance since it has 5 bands (which seems to be orange/orange/black/gold and the fifth I can't understand what color is)
RM801: from the color, I guess this is a 0.22 ohm 5% (red/red/silver/gold) (I wasn't able to measure it)
RB808: it should be a 2 ohm 5% resistor (red/black/gold/gold), the tester gave me a 2 value even if measured on board;
this is what I gathered from the colors and the readings, still have no clue about the power dissipation and with what kind of resistors I should replace them (carbon, metal film, High Power Wirewound, etc.). Any help will be very appreciated.
Of course I checked the fuses too, and they appear to be both open circuits, so I'll have to buy a couple new too.
Lastly, as I said before regarding the fact that I'm ordering online, I'd like to know if there's anything else that I can check with the multimeter, in order to add other possible components to the order - so the what to check and how to check (I'm a newbie so I'll need detailed instructions I guess).
Well, that's it, my wall of text is over, you can see some photos attached to the post, if you need some more photos, ofc feel free to ask.
Thank you all in advance!Last edited by Galandil; 09-29-2015, 10:53 AM.Tags: None
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