I'm having a similar problem to this [URL="https://www.badcaps.net/forum/showthread.php?t=48158&highlight=J852"]https://www.badcaps.net/forum/showthread.php?t=48158&highlight=J852[/URL] and I'm trying to buy replacement resistors on Digikey.

From what I have gathered, I still have a choice of 18 resistors.

Here's the search results [URL="https://www.digikey.ca/products/en/resistors/chip-resistor-surface-mount/52?k=1.5M+SMD+resistor&k=&pkeyword=1.5M+SMD+resistor&FV=80003%2Cc0001%2C400006%2C142c040d%2C1f140000%2Cffe00034&mnonly=0&ColumnSort=-2085&page=1&stock=1&rohs=1&quantity=0&ptm=0&fid=0&pageSize=25"]https://www.digikey.ca/products/en/resistors/chip-resistor-surface-mount/52?k=1.5M+SMD+resistor&k=&pkeyword=1.5M+SMD+resistor&FV=80003%2Cc0001%2C400006%2C142c040d%2C1f140000%2Cffe00034&mnonly=0&ColumnSort=-2085&page=1&stock=1&rohs=1&quantity=0&ptm=0&fid=0&pageSize=25[/URL]

Re: Samsung LN55C630K1F backlight issues

Help? I couldn't find a disassembly guide for the TV either sonI can't get the part numbers for the ccfl.

Re: Samsung LN55C630K1F backlight issues

What do I do once I find the bad CCFL lamps? What can I find one for my TV model?

Re: Samsung LN55C630K1F backlight issues

Any help?

Hi everyone,

I decided to start a new thread since the last one was more about the power board issue (which I replaced). Here's the link to the [URL="https://www.badcaps.net/forum/showthread.php?t=57176"]old thread[/URL].

Here's a recap of the problems I am having now with the backlight.
[LIST][*]There's two inverter boards on this TV, I previously purchased two replacement boards that I never used.[*]I always had problems with the backlight on this TV (before the power board blew up). Sometimes I opened the TV and it would work for a few minutes...

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

I replaced the bottom board that was buzzing and no more buzzing noise, but still the same problem if I switch to TV input and get the snow it closes almost inmediately.

I left the TV on for about 5-10min on the HDMI input (with nothing connected) and it stayed opened. I changed the input to TV and it stayed on this time... I'm really lost here..

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

There's also a buzzing noise coming from the second transformer starting from the top on the bottom inverter board when the backlight is on. Lowering the backlight in the menu diminishes the buzzing noise.

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

OK, I haven'5 had the time to check but I've noticed something weird. I opened the TV and the input was previously TV and since it's not connected to anything, I was getting snow and as soon as the snow appeared the backlight would close. I changed the input to HDMI 1 and restarted the TV. Since there's no snow on this input, the TV stayed opened for a long time. As soon as I changed the input to TV, the backlight closed.

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

So last night, I was running the inverter boards connected but not screwed to the TV, just hanging by the connectors and I was able to see the image, maybe the backlight was staying on longer.

Now I put the 4 screws that have a metal plate around the holes and I get the same thing as before, a flash for a second and then black.

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

I tried with 2 other inverter boards that were on this TV before (changed them but didn't fix the issue at the time) and now I'm getting the image for a few second (showing TV 3 with "snow") and then the backlight stops, image is still there (checked with a flashlight).

I'm wondering if the inverter boards have some sort of ground with the screws since I just connected it without screwing anything.

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

yes I'm getting a flash.

what do you mean by check resistance of output winding of the transformers?

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)



No problem . By the way, on my last post about low voltage I was referring to the main filter cap voltage....

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)



Well I was told to get the AC V on the pins in red (see [url]https://www.badcaps.net/forum/attachment.php?attachmentid=142534&d=1475896228[/url])Re: Samsung LN55C630K1F power failur...5896228[/url])Re: Samsung LN55C630K1F power failure (BN44-00342B power board)



Well I was told to...

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

Is the voltage being low the cause or the effect of the backlight problem? Wht should I test next?

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

OK so I measured again and the voltage onthe caps is 368-369V on both, maybe I took some time between the 2 measurements last time (ie startup and later?)

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

What should I do in this case?

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

I have 12.12V on the Pin 1 (12V) and 8.74V on Pin 7 (LD)

For the main filter caps
386V on CP802
367V on CP803

I also got a new multimeter, here's the readings for ACV on the 18 test points

1 2.6
2 2.0
3 1.4
4 0.9
5 0.4
6 0.7
7 0.5
8 0.4
9 0.6
10 3.4
11 4.7
12 3.3
13 4.3
14 4.3
15 2.5
16 2.5
17 2.2
18 3.3

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)



Yeah sorry about that formatting.

The last board you asked to take ACV readings.

1~10 = the points you highlighted
11~18 = same points on other board below it....

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

Oops didn't mean to post this...

Re: Samsung LN55C630K1F power failure (BN44-00342B power board)

OK so everything was good for 1 and 2.

For test #3, here's the voltage measured (I also checked the other board).

1 18v
2 15v
3 11.8v
4 6.8v
5 2.4v
6 5.7v
7 1.6v
8 2.2v
9 1.6v
10 18v
11 16.7v
12 15.6v
13 18v
14 15v
15 16.7v
16 17v
17 16.2v
18 17.8v

Values seem very weird though...