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.
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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