Re: BN44-00195A strikes back!
Thank you for the answer, Budm.
So this means that I can even remove this cap without issues.
Then this should work fine: [url]http://it.farnell.com/epcos/b32671l0123j000/conden-film-pp-0-012uf-1kv-radiale/dp/2468980[/url]
I'm only concerned a little about the length of the terminals, they seem to be 5mm long, and the distance between them is 10mm whereas on the board the distance between the holes is about 14mm, but I have no other choice at the moment (there's another model by Panasonic...
Galandil
Member
Last Activity: 01-07-2019, 09:13 AM
Joined: 09-26-2015
Location: Arezzo
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Re: BN44-00195A strikes back!
Hello guys, I'm back to the forum since the other 245B that I have at home went dead, usual problems due to the BN44-00195A power board.
I know already all the pieces I need to change, except one: the CY803S lenticolar cap.
I can't remove all the glue that's on it, so the only thing I can read is the value and tolerance: 471K, so it's a 470pF with +/-10% tolerance. What I'm missing is the voltage rating.
I tried to find the schematics of the power board, and one I found shows a completely different value for that...Last edited by Galandil; 03-24-2018, 10:04 AM.Leave a comment:
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Re: BN44-00195A strikes back!
Update.
Today I received all the pieces finally, and mounted them. Operation 245B+ successful, now it's working again.
Thanks budm for all the advices.
Just a not-so-important question: for some reason, now the blue standby led of the monitor is a lot dimmer than before. Can it depend on the fact that some pieces are not exactly the same as before?
Namely, the fusible resistor with a tolerance of 10%, the 12nF cap @800V instead of 630V, and the 47pf and 2.2nF ceramic caps @2kV instead of 1kV....Leave a comment:
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Re: BN44-00195A strikes back!
Well thanks for all the help, budm. I'll put the orders and I'll report back as soon I finish getting back (in working state, I hope) the monitor.
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Re: BN44-00195A strikes back!
Ok, thanks, just one last thing: I just want to be sure and buy the 2 MOSFETs as a replacement in case something goes wrong or they'll break in the future.
The code is FQPF9N50C, and I can see that this product is discontinued by Fairchild, now they sell the FQPF9N50CF. Is it ok in case to use the new one?
The specs are these:
C - [url]https://cdn.badcaps-static.com/pdfs/4e6a646ed8b15d25f26eaa73d52af526.pdf[/url]
CF - [url]https://cdn.badcaps-static.com/pdfs/7c6311d3592e8629c3bf029...Leave a comment:
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Re: BN44-00195A strikes back!
Ok, I managed to find a shop that sells all the capacitors I need (including the ceramic ones and the 12nF 800V).
Now, I'm almost done with the pieces needed, except for one: the dreaded R22 1W 5% fusible resistor. Apparently, it's almost impossible to find one such resistor, in all italian online big shops I couldn't find it, Mouser doesn't have it, Digikey doesn't display the price since it's a non-stock (and apparently you need to order a large quantity, 2000 pieces), etc.
The only available resistor that I found available...Leave a comment:
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Re: BN44-00195A strikes back!
But my meter doesn't have a capacitance mode.
This is my meter: (and atm I can't even check currents, since I just discovered that the internal fuse is shot damnit)....Leave a comment:
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Re: BN44-00195A strikes back!
Ok, this evening I removed the .22 resistor from the board, measured it and... nothing, it's an open circuit so I guess it's blown.
How am I supposed to check the capacitance without an ESR tester?
I removed the cap and tested for resistance: open circuit always. IIRC caps should show a raising resistance with the tester in ohm measurement mode. Should I try some other test?
Don't those 2 MOSFETs have a diode between source and drain? I checked for it with...Leave a comment:
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Re: BN44-00195A strikes back!
Then I need to de-solder it in order to check if the actual one is ok. From the photo, it seems that it hasn't blown/taken fire, can you confirm pls?
However, since all the resistors measured ok, I guess I can skip them.
Now the only problem remains with the 12nF, what happens if it's shot and I proceed to mount all the other caps and turn on the power board? Is there any risk that something else will break again, or it will just not function? If it's the latter, I can take the risk and order and mount all...Leave a comment:
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Re: BN44-00195A strikes back!
From that shop, there're no MOX 0.22 resistor with 1W, the only one has a power rating of 0.6W.
There's a 0.22 resistor with a power rating of 2.5W though, it's a wirewound resistor, this is the specs sheet:
Which one should I get?Leave a comment:
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Re: BN44-00195A strikes back!
Regarding the resistors, I've found these as substitutes (all metal film):
2x100k ohm 1W
33 ohm 1W
2 ohm 0.6W
0.22 ohm 0.6W
Dunno if the power ratings are ok for each resistor, there're even power resistors for the 0.22 one with a power rating of 2.5W.
About checking the 12nF cap, I'd have serious problems in doing that, as I said I don't have an ESR meter, I checked the resistance with the meter set to 2M and the value stopped almost instantly at 206 instead of going up indefinitely. Can it be...Leave a comment:
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Re: BN44-00195A strikes back!
Ty for the info about the ceramic caps. I didn't find them on that store, but apparently a guy on ebay from the UK has both of them with a 2kV rating.
Fact is, though, I have serious problems in finding the 12nF 630V (800V) 3% cap, I can't find it anywhere except on digikey and mouser (which imply a cost of respectively €18 and €20 to Italy, whereas all the products amount to only €11-12...).
What can you tell btw regarding the resistors? Are those values correct, and what power rating should I choose?Leave a comment:
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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...Last edited by Galandil; 09-29-2015, 10:53 AM. -
Re: New Members - please post your introductions here
Hi all, just subscribed to the forum, found since my Samsung 245B+ monitor just died. There's a silver lining in everything, I guess.
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