Dell P2214Hb not turning on, power supply issue?

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  • Shuasmith14
    New Member
    • Aug 2021
    • 6
    • USA
    #1

    Dell P2214Hb not turning on, power supply issue?

    Hello, I have a Dell LED monitor P2214Hb that doesn't do anything when the power button is pressed, power button is not lighting up at all. I'm pretty new to this, but I started with testing the power supply first. I know I'm dealing with high voltage and am being careful, I'm using a differential probe for my O-scope measurments. The PS board is E162032 Vol. 3, 4H.26302.A04.

    Currently I'm getting steady 5v at pins 3,4,5 at the left side connector output and steady 22v at the right side connector output pins 3,4. Right side pins 1,2,5,6 is switching between 0-60v and left side pins 1,2 have a wierd cycling voltage between -0.5 - 1v. Since this is for an LED monitor I'm not sure if these are an issue or if this is normal.

    I'm not seeing any obvious shorts or opens anywhere, but I could be missing something. First waveform is the Left side output pin 1, second and third waveforms are the right side output pins 1,2,5,6. The second one is the actual waveform, the third one is my ground probe attached and my other probe lead just floating/not touching anything. The fourth waveform is at the gate of MOSFET Q801.

    I have 22v at Drain of Q801 and it looks like the gate is switching, but I don't understand where the source is going? There's 2 R39 resistors parallel to ground and a 1k ohm resistor going back to the IC.

    Sorry if this is excessively long, I tried to get as much detail as I have so far. Any help is appreciated.
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    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6033
      • USA
      #2
      Re: Dell P2214Hb not turning on, power supply issue?

      One thing I noticed is that some of the soldering joints look suspiciously suspect they might be bad soldering joints I would recommend that you re-solder them first and see if this makes a difference or not

      What I referring to is the soldering joints that have rings around them or have a lot of flux residue around them I would re- solder them just for good measure

      Yes this is time consuming but sometimes well worth the effort to know that this is not a contributing factor in what might be causing you issues
      Last edited by sam_sam_sam; 09-10-2022, 11:54 PM.

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        • Shuasmith14
          New Member
          • Aug 2021
          • 6
          • USA
          #3
          Re: Dell P2214Hb not turning on, power supply issue?

          Did you have any specific ones? They all looked good from what I can tell. The one smd cap by Q801 I desoldered because I thought it was shorted but it wasn't so I resoldered. That didn't change any issues I've been having before or after. I tried to get a better picture too.
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            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6033
              • USA
              #4
              Re: Dell P2214Hb not turning on, power supply issue?

              The ones that I circled in red it mostly the larger diameter component pins that I circled

              This is what I am seeing from the picture that you post now I do not know if it is the way the light is hitting it that it makes it look like it not a good soldering joint
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