Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Caps

[PDMAN]

I searched for the values that are used and only 2 posts came back but not enough info.
I have a set coming this week that has the bad cap issue. I wanted to get an order in to digikey or mouser for replacement caps. I'd like the info on the values in uf, minimum voltage ratings and I know to use low ers and 105c caps.
What brand series, etc do Folks recommend? This would be for all caps on the power supply PCB. Figure once in there change them all.
If there is a service manual or schematics, I could get the values off of that.
I have tried ElektroTanya! but you need to be referred or take a test. I took the test and failed one question. Have to wait a couple of days to take another.
Been asking for a referral but no dice.

[Hamie]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

How do you know it's capacitors?

[budm]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

I use PANASONIC FM/FR/FC for all my repair, but you should at least see the inside first and see what is wrong with the set first. You also need to get the P/N of the power supply board and then look at tom66 web site for the diagram, it should have numbering like BN44- XXXXX.

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

How do you know it's capacitors?

Well the guy I'm getting it from told me so. The caps are leaking and bulging.

[selldoor]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

It doesnt really work like that.
We have found that even the same set with the same model number can have
different caps in different places - some even have a different power supply board, so really you have to wait until the board is received then see what caps are on the board. You do not usually have to replace the BIG cap/s unless they are obviously bulged or leaking.
You laso need to know what physical size will fit - no good buying great 12mm caps if the space is for 10mm. Or 30mm high caps if they have to go under a 25mm high heatsink.

Who says it has a capacitor problem? and not other problems. Really bad caps can take out a whole selection of mosfets diodes and other components.


Quite a few of us recommend Panasonic FR FM or FC in that order but equivalent niichicon rubicon or ucc are also good. Type Good + Capacitor in the search should give some hits.

Damn - must get faster fingers

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

I use PANASONIC FM/FR/FC for all my repair, but you should at least see the inside first and see what is wrong with the set first. You also need to get the P/N of the power supply board and then look at tom66 web site for the diagram, it should have numbering like BN44- XXXXX.

good advice budm. But the guy i'm getting the tv from looked at the PS and the caps are leaking and bulging the tops. Plus it has the classic symptoms of the bad cap issue.

Can you give me tom66's website address?

Thanks

[budm]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Here it is:
http://www.toms-service-manuals.com/

[mu2]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Hi,

According to shopjimmy the power supply / inverter is BN44-00264A.
Tom has the schematic on his website.
Personally, I'd wait till the set comes in before you order the caps. Digikey only takes about 3 days shipping using the US mail option. Ordering from thecapking.com is another option - also very fast.

Mike

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Thanks budm and Mike

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Wouldn't it be good preventative maintenance to replace the Caps anyways, even if they looked OK?
They're going to fail eventually and while the set is open, why not.

In my case it has been confirmed that the caps are bad. Will be getting the set Tuesday night.

[tom66]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

I have not heard of any B-series Samsung LCD TV with bad capacitors, but it can be good practice to replace them sometimes. How have you confirmed the capacitors are bad?

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

I have not heard of any B-series Samsung LCD TV with bad capacitors, but it can be good practice to replace them sometimes. How have you confirmed the capacitors are bad?

the guy i'm getting the tv from looked at the PS and the caps are leaking and bulging the tops. Plus it has the classic symptoms of the bad cap issue.

[selldoor]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Did you have a picture?
We have has leaking bulging caps on here where the leaking was
a) Glue
b) Flux
C) Chocolate Ice cream!!

Bulging - BIG caps have a disk which quite often curves with heat
underneath the cap is fine.

What classic symptoms? We have seen everything from a total none start
to a few colour flecks on screen.

[tom66]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

the guy i'm getting the tv from looked at the PS and the caps are leaking and bulging the tops. Plus it has the classic symptoms of the bad cap issue.

I don't want to dissuade you but 9 times out of 10 when someone has had a look at the TV I've bought off them, they've either managed to make it worse or in the very least have completely misdiagnosed the problem. I tend to stay away unless I can be sure about what they have done.

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

I don't want to dissuade you but 9 times out of 10 when someone has had a look at the TV I've bought off them, they've either managed to make it worse or in the very least have completely misdiagnosed the problem. I tend to stay away unless I can be sure about what they have done.

Granted that can and does happen. I will test voltages when I get the set and for the obvious physical signs of cap damage.

Maybe a little background on myself. I was an ET starting back in 1974. I have worked in High Tech here in MA since then. I also held a MA Master's TV Repair License here in MA. I let that go about 10 years ago. I moved on up to EE and then for the last 18 tears was a Test Development Engineer for a major Semiconductor equipment manufacturer and supplier.
I had to take an early Disability Medical retirement. I'm in my early 60's.
So I am skilled in troubleshooting, using all kinds of test equipment, etc.

I have also been repairing pro audio gear, guitar amps, synthesizers, fx, etc. for decades.
I also do pinball repair as well.

I got back into the TV thing about a Month ago. I found this Forum and it looked fantastic.
There is a lot of great advice here and I'm going to accept it as you Folks have been doing this stuff for quite a while and are the Gurus in my book!
I am extremely appreciative of all the help everyone here has offered.
It is much appreciated and wanted!!!
Thanks

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Well, you guys were right. There were no leaky caps at all in the sert. Guy obviously lied or didn't know what he was talking about. Opened it up today but didn't have my camera. The caps are in great shape and the 1000uf are rated at 25VDC.
So here are the symptoms. Plug in set. Use remote to turn on. Led blinks continuously. i am able to shut off the set as well from the remote. I did measure 5 VDC standby and it was good. 5.3 VDC measured 5.2VDC and 13 VDC was at ~ 12.90 VDC.
Turn on signal went from 0VDC to .89VDC.
What else should I measure and any other things I should check?
Thanks

[budm]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

OK, this power supply-inverter board has built in pull-up resistors for the PS_ON and the BL_ON, so if you remove the cable between the power supply and the main board, when you plug the TV in the backlights should come on right away, if it does, it means the power supply is OK and the problem is some where else.
So far it looks like the main board is the problem because the PS_ON is only 0.89V (<1V = OFF).

[PDMAN]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

OK, this power supply-inverter board has built in pull-up resistors for the PS_ON and the BL_ON, so if you remove the cable between the power supply and the main board, when you plug the TV in the backlights should come on right away, if it does, it means the power supply is OK and the problem is some where else.
So far it looks like the main board is the problem because the PS_ON is only 0.89V (<1V = OFF).

I think I did this already. The Main board is the one with all the input video connections and such?
If so, when disconnected and the set plugged in and then turned on, same thing, just the red led continuous flashing. But I will try it again just to double verify.
Thinking of starting a new thread on this and adding what budm has told me so far.

[budm]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

" when disconnected and the set plugged in and then turned on, same thing, just the red led continuous flashing"
If you did have the cable between the power supply and the main board disconnected then the main board will not get the power to light the LED, so it means you did not disconnect the cable between the power supply and the main board. There will be no power to the main board if the cable is disconnected.
The power supply will turn itself on right away because there are pull-up resistors on the power supply board to provide the voltage to the PS_ON pin and the BL_ON pin.

[selldoor]

Re: Samsung Model # LN40B630N1FXZA - General question about Samsung PS replacement Ca

Budm He has started a new thread and still no pictures