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Marzog
Member
Last Activity: 07-27-2015, 06:50 PM
Joined: 09-04-2014
Location: Milwaukie Oregon
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    The replacement board cost me $62 from TVpartsguy.com. Plus $9.99 for shipping. So, in the end it cost me $72 or so.

    Was the only exact match I could find on the internet. Plugged the board in, plugged in the tv, single click and the standby LED light came right on. I pressed the power button, and it gave me the samsung chime and turned on.

    Picture is fine as well. So yeah. All is good now
    Thanks again for all of your help! Never would have figured this out without you guy...
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    New main board did the trick!!!! Tv turned on and everything! Thanks for all of your help!!!
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Alright, so... Finding an exact replacement for BN41-00965B looks like it's gonna be pretty tough. Plus it'll run somewhere in the $70 range.

    Just for clarification, is it possible to fix this thing? Or, given my total lack of skill in this area, would it just be better to consider it a lost cause?

    I'm aware a newer (and better) tv of the same size would only be around $300. But paying $70 is a lot cheaper than $300.
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    Last edited by Marzog; 09-10-2014, 06:20 PM.

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    So what comes next? Judging by some further tests, it still spikes at 2.10A
    I tried pressing the power button on the tv and the remote and I tried having the button board disconnected.

    The only difference I noticed is when I was holding the power button down. While doing this, the reading seemed to spike at 1.7A or so.

    Does this indicate that the main board has a flaw that causes it to draw more power than needed? And that's somehow preventing the tv from powering on?...
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Ah, then yes. I never touched the power button on the tv or the remote while getting the reading. If you'd like, I can try the reading again, but this time I'll press the power button and see what happens. And maybe I'll try it again with the button board disconnected.

    Update: just did the afore mentioned tests and I got the same results. It spikes around 2.10A. Hitting the power switch on the tv or the remote didn't seem to make a difference at all.

    Also an interesting note: the floor lamp in my room, which...
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    Last edited by Marzog; 09-09-2014, 03:49 PM.

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    What do you mean by the "power switch not activated"?

    If you'd like me to test this again but with certain things unhooked, I'd be glad to give it a try. Assuming I cut the correct wire in the first place.
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    Read the owners manual, and followed the instructions for conducting a DC current measurement.

    I conducted this test with my multimeter in 10A. I assumed that the 5VSTBY wire is the wire correlated with pin #3, so that's the wire I snipped and tested.

    According to my multimeter, the current draw changed with each of those 'tick' sounds.
    E.g: it would display 0.38 *tick* 1.59 *tick* 0.51 etc.

    As far as I could tell, there was no pattern to the current draw, but it fluctuated...
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    Last edited by Marzog; 09-09-2014, 02:03 PM.

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    How would I apply 5 Ohm 5 Watt resistor load onto the standby?

    And how would I test the dc current draw of the main board? Since, measuring what current it draws would require it to be plugged in. And if it's plugged in... I don't know how I'd get a reading from it.
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    Alright. So, what exactly is this pointing to? Does all of this indicate that the main board is indeed at fault? Should I consider getting a replacements in board? Or are there some more tests you'd like me to conduct?...
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Did two follow up readings on the main filter cap. Multimeter was on same setting as in the previous post.

    Without main board attached and no resistor but no resistor: 165
    Without main board attached and WITH a 1k resistor jumping pins 1&3: 390

    As you can guess by now, I'm very inexperienced with electricity and how circuit boards functions and all that. Any ideas what these readings mean? Assuming I read them right in the first place.
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Just tested with the main filter cap (CP815) with the main board attached. If I'm reading the multimeter correctly (I had it set to DCV 1000) it read between 245-265. I attached a picture of the setting I had the multi meter on....
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    How will I measure them with the power on? I checked the same ions with the power on, and the only difference was the ground pins read 1.1-0.9. The rest were over range. Is there where I'll need the 1k resistor and some small wires?
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    The multi meter simply said 0.6 on most pins. If it didn't have a reading, it just showed
    1----.- where '-' designates a blank space.

    And each pin has a label as far as I can tell.

    The attached picture below indicates which pin is which as far as I can see....
    See more | Go to post
    Last edited by Marzog; 09-07-2014, 08:58 PM.

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Tested all the pins using one multimeter prong, with the other on ground screw. Multimeter was set on Ohms (200).

    Here are the results:
    1: 1
    2: 1
    3: 1
    4: 0.6
    5: 0.6
    6: 0.6
    7: 1
    8: 1
    9: 0.6
    10: 0.6
    11: 0.6
    12: 0.9
    13: 1
    14: 1
    15: 1
    16: 1
    17: 0.6
    18: 0.6
    19: 1
    20: 0.6
    21: 1
    22: 1
    23: 1
    24: 1
    See more | Go to post

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    Aye. Based on what others have been saying, I'm leaning towards that conclusion as well. But before I spend the $65 for a new main board, is there any possible way to work around whatever the faulty part is?

    For example, if the audio chip is the culprit, is there a way to work around it? If it helps I will likely be using this tv as a second monitor for my laptop, so sound wouldn't be needed. Not sure if it's possible to do this, but just thought I'd ask....
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.



    That's correct. Granted, I was able to check the standby voltage without the power supply connected to the main board. With the main board connected, disconnected, or with a 1k resistor in place between pins 1&3, still no led light. As far as I could see at least....
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    I'll test that when I get home tonight. I assume the main filter capacitor is the large black cap near the center of the board?
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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Quick update: got the resistors, did test with jumping pin 1 to 3. When power is connected to the board, a single "tick" is heard. Tomorrow, or when I have more time, I'll get some readings for the other pins while the resistor is in place and report back here.

    Also, I did what Caleb suggested and checked the standby voltage. I got a very steady 5.2v reading.
    See more | Go to post

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    I'm still at work for another 5 hours or so, but I'll try to test the PS_ON once I get home. How would I go about testing that anyways? Will I need the 1k resistor for that, where do I place the multimeter prongs, what setting should it be on, etc.

    Also, for the test involving the 1k resistor, will any 1k ohm resistor do? The one I can obtain fairly easily are "1K Ohm 1/4-Watt Carbon Film Resistor" at my local radio shack. Will those do? Or does the wattage matter?
    See more | Go to post
    Last edited by Marzog; 09-05-2014, 04:01 PM.

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  • Marzog
    replied to New power supply, but tv fails to power on.
    in Troubleshooting TVs and Video Sources
    Re: New power supply, but tv fails to power on.

    Unfortunately, I don't have a 1k resistor just lying around, and I'm working two 8 hour shifts in the next two days. It'll be Monday before I can test anything really. Thanks for the advice though!

    I did check the speaker cables and saw nothing wrong with them. I unplugged them from the main board and attempted to plug the tv in again. Sadly, I got the same result as before. However, the grounding wire from the power cord connection seems to be at an awkward angle, so I'll be investigating that closer soon.
    See more | Go to post

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