Samsung PN58C550 No Power question

[kanescubs]

I just picked up this tv and I'm trying to fix it to give it to a family in need. I took the back off the tv and replaced the blown fuses. I took all the connections off the power supply board and plugged the tv in and the fuses were ok. I then proceeded to plug one board at a time into the power supply to see if it would blow the fuses. All the boards were ok except the component board or main board (part BN41-01344A). Do you think if I replaced the part that's blowing the fuses it will fix my problem? I'm very new to this so any advice is greatly appreciated!

[MagicSmoke]

Re: Samsung PN58C550 No Power question

Main board sends signal to PSU to turn on, Logic board then sends signal to bring up X & Y main boards. I don't think the Main board has any component on it that would draw enough current to blow the PSU fuse. X & Y mains do though.

Have you tried the jumper test on PSU with it disconnected from all other boards to see if it is making the correct VS & VA voltages without blowing fuse.

BTW posting a pic of front and back of PSU will help as someone may spot a problem that you might have missed.

[kanescubs]

Re: Samsung PN58C550 No Power question

I'm not sure how to do the jumper test. Can you help me through it? Why do you think I'm blowing a fuse when I connect the main board? The back of the main board doesn't look great. I don't see burns but there is wearing on it. My power supply looks good I don't see anything visual but I know that doesn't necessarily mean anything.

[MagicSmoke]

Re: Samsung PN58C550 No Power question

Pics Of PSU will help, particularly the power connectors so we are able to see what pins are where and the specified voltage they are supposed to have.

Do you have a suitable multimeter to test for DC volts???

To test, if this is your PSU in link below, then unplug upper left wires to Y main, middle wires to X main, lowest right bottom wires to logic and the wires connecting to main board. Leave the connection at PSU unplug this one from Main board.
You will need this cable to jumper with a bread tie or suitably small gauge wire.

Really need pics of the connector legend to main board to be sure which pins to jumper.

https://www.badcaps.net/forum/attach...8&d=1362347385

[MagicSmoke]

Re: Samsung PN58C550 No Power question

Why do you think I'm blowing a fuse when I connect the main board?

Are you trying to turn on TV after each connection or just plugging them in then connecting power cable??

Because main board tells PSU to power up. Without it being connected the only DC output voltage on PSU should be 5V or whatever STBY volts are for your unit.

[kanescubs]

Re: Samsung PN58C550 No Power question

I just plugged them into the power supply then plugged the tv cord into the outlet. This may sound dumb but I can't figure out how to post pictures.

[kanescubs]

Re: Samsung PN58C550 No Power question

The picture you sent me looks like the same set. I do have a good tester but I'm not good at understanding it. I will try to test the psu tomorrow to see what the board reads. Thanks a lot for your help it's greatly appreciated!

[mmartell]

Re: Samsung PN58C550 No Power question

... I'm stuck on the part where you said a family *needs* a 58" television...

[kanescubs]

Re: Samsung PN58C550 No Power question

... I'm stuck on the part where you said a family *needs* a 58" television...

I'm trying to help out a family who doesn't have and can't afford a tv. It just happens to be a 58"tv that I picked up for free. They don't need it but I would like to help.

[MagicSmoke]

Re: Samsung PN58C550 No Power question

What is the P/N on the bar code on the PSU so I can see if I can get an idea of which pins to jumper. It should have a number on it similar to this BN44-00331A.

[kanescubs]

Re: Samsung PN58C550 No Power question

What is the P/N on the bar code on the PSU so I can see if I can get an idea of which pins to jumper. It should have a number on it similar to this BN44-00331A.

I checked the board and that is the number on the psu. I really appreciate you taking the time to help.

[kanescubs]

Re: Samsung PN58C550 No Power question

I just received my other main board and I put it into the tv and tried it out and the fuses blew again right away. It must be the psu or something else.

[MagicSmoke]

Re: Samsung PN58C550 No Power question

First question, what meter do you have? Are the settings for DC volts separate 2, 20,200,600 or is it auto ranging ( just one position for DC volts )?? Actually 2 questions.

BTW here are the instructions for adding pics to the thread.>https://www.badcaps.net/forum/showthread.php?t=1868

When you click on the upload button you have to wait until it finishes the upload, it is not instantaneous.

[kanescubs]

Re: Samsung PN58C550 No Power question

First question, what meter do you have? Are the settings for DC volts separate 2, 20,200,600 or is it auto ranging ( just one position for DC volts )?? Actually 2 questions.

BTW here are the instructions for adding pics to the thread.>https://www.badcaps.net/forum/showthread.php?t=1868

When you click on the upload button you have to wait until it finishes the upload, it is not instantaneous.

I just wanted to say thanks for reaching out to me and helping to is greatly appreciated! I just found a power supply board on eBay and picked it up for under 30.00 and tested the tv and I had success. The tv looks great! Thanks again