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Sun 24.1 LCD / Samsung 244T

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  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    If the front panel control panel switch board is not connected, then how did you activate the power so the monitor will turn on to generate the PS_ON? Is it also connected to running PC?

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  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Thanks for all your help, guys. I know it must be frustrating dealing with someone not skilled in troubleshooting.

    One more question- The wire harness in my photo #1. It goes to the front bezel on/off switches along with a couple of other switches like Left/Right/PIP, etc. When I'm testing this board, is it ok that it is not connected to anything or should I try and remove the skinny circuit panel behind the bezel and plug it in?

    Also, how much can I expect to pay for a new panel? Ballpark range.

    Thank you again,

    David

    Leave a comment:


  • jetadm123
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    I'll take one last stab at this. Try changing the startup cap circled in the photo. I believe it to be 10uf 50V. If you can't get this value, then try 22uf or 47uf 50V. As this is for testing purposes, we're not concerned about getting the right type of cap. If you don't have old circuit boards that may have the cap you're looking for, then Radio Shack or Fry's should have it. Hopefully, you have a Radio Shack within driving distance.
    Attached Files
    Last edited by jetadm123; 02-06-2013, 09:14 PM.

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  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Well, I do not know what happen, we had the PFC working before, the only circuit that was not working was the 12v/24v which we found that we are not getting the VCC to feed pin 2 of the 12v/24v SMP IC. You will have to trace back to what you have done or changed. Time for new board.

    Leave a comment:


  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Bud,

    After hooking everything back up I still have 166 on the large cap. I restested the 3 small caps ner the IC and got

    CM318-----4.26
    CP811------4.82
    CM809-----9.9

    Also added to previous post.

    Thanks

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  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Hook everyhing back up, plug it into the outlet, turn it on then check and see if we have our >380vdc on the large cap again.

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  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    I may have mistakenly made those tests you all suggested on the board without having it connected to everything else. Sorry if I screwed up there.

    So, if I'm looking at this correctly there are the 3 we've been testing by the IC and 3 more in front of the large cap, for a total of 7? Anywhere local (Richmond VA) I should be able to find these or should I go online? Bud? Thoughts?

    Is Radio Shack a place you all don't think highly of? Here's what I found for the large cap on their site. http://www.radioshack.com/product/in...uctId=12438411

    Concern is under their specs. 2000 hours +-12??? NTE brand reputable? 100uf 450v
    Last edited by roadstir; 02-06-2013, 04:14 PM.

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  • jetadm123
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Well, if you're back to 168V at the main cap, then it looks like the PFC section is no longer on. Therefore, it looks like we went full circle and are back to where we started. If all the caps had been replaced, then at least we'd have a good starting point for troubleshooting. At this point, I would consider replacing all the small caps and possibly even the large main cap as some members have reported having problems with it. Budm may have other thoughts as what your next step should be.

    Leave a comment:


  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Jet, I'm seeing 168 on main cap.

    Bud, you're saying I should have the power board fully hooked up with the other signal and inverter boards? If so, I'll do that. What should I re-check after doing so?

    Also, after I hook up all the boards, what about the on/off switch that's attached to the plastic front panel frame. The wire harness is in my post #1, picture 3.

    Thanks
    Last edited by roadstir; 02-06-2013, 10:24 AM.

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  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    If it is not attached to the main board, then the PS_ON will not be activating the power supply to power up the PFC and the 12v/24v power supply.

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  • jetadm123
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Are you still seeing 374V across the main cap?

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  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Bud,

    I have the power switched on with the paddle switch next to the cord on the panel, yes. And the power board is not attached to any of the other boards. It's on the work table by itself.

    Leave a comment:


  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    "top pin = 0
    middle pin = .02
    bottom pin= .02"
    Do you have the TV power on with power switch activated? There has to be voltage at the middle pin since the PFC circuits are working.

    Leave a comment:


  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Bud,

    In regard to the 3 pins you had me check. I had VDC at 20 and got

    top pin = 0
    middle pin = .02
    bottom pin= .02

    Bear with me as I'm not a techie, but I measured the resistance with my Greenlee DM-20 starting with 200 up to 2000k.

    At 200, when I first touched the two I would get a momentary reading of 85 up to 155 then it would drop back to 1 again. Again, I would touch it 3 or 4 times and would get a quick reading and then back to 1 again.

    Thanks for taking the time to flag the photo for me. Unfortunately, I washed out of Navy flight school due to a slight red-green color blindness issue so it took me a bit to find the spots, but I did!

    Leave a comment:


  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    OK, check the ZENER DIODE ZDS806 for short, check the DC voltages on QP803 (it supplies voltage to VCC pin 2 of the 12v/24v SMP IC)
    Attached Files
    Last edited by budm; 02-05-2013, 07:07 PM.

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  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    I was not sure which one of the 3 caps is connected to pin2 (not 7 as I said) of the IC. I will look at the board to find the switched transistor that supply the voltage to pin2 next.
    Pin 2 is VCC.
    Last edited by budm; 02-05-2013, 05:55 PM.

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  • jetadm123
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Originally posted by budm View Post
    He will need to put the meter in DC Volt mode next to check the VCC at pin 7 and the ground pin.
    I thought he already did that in post #32 when he measured the voltage across the 3 caps.

    Leave a comment:


  • budm
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    He will need to put the meter in DC Volt mode next to check the VCC at pin 7 and the ground pin.

    Leave a comment:


  • jetadm123
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    Looks like there's no voltage input to the Vcc pin of the F9222L controller.
    Last edited by jetadm123; 02-05-2013, 05:32 PM.

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  • roadstir
    replied
    Re: Sun 24.1 LCD / Samsung 244T

    At 2000k I get 180
    At 200k I get 26.2
    At 20k I get 4.27
    At 2000 I get 564

    When I touch probes together I get essentially get 0 on the higher #'s. ie 20k or 200k

    Ok, I must be doing something wrong. After waiting about a half hour I retested and all showed 0 readings.
    Then I powered up again for about 10 seconds and shut down. Then I retested and got the original readings above.
    Last edited by roadstir; 02-05-2013, 05:20 PM.

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