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    #1

    Another broken CTL, flashing LED

    This one also won't power up, the LED on the front just flashes orange and blue. When plugged in it gives that high pitched whine sound. Getting 165.5V across the input cap, the voltage regulators are giving out proper voltage on the main board (going from right to left in the picture):

    #1
    Pin 1 = 0.00V
    Pin 2 = 3.31V
    Pin 3 = 5.10V

    #2
    Pin 1 = 0.00V
    Pin 2 = 1.80V
    Pin 3 = 5.10V

    #3
    Pin 1 = 0.00V
    Pin 2 = 3.30V
    Pin 3 = 4.78V (Seems pretty low)

    The whine on the power supply would change pitch when testing the regulators. Also, the fuses test fine. When unplugged the whine goes away immediately.
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    #2
    Re: Another broken CTL, flashing LED

    1) For the future, when posting the results of the voltage regulator, add the part number so we can tell if the voltage regulators are good or not. We all don't have the eagle eyes of selldoor (although I was able to see enough in your photos to know all 3 are good).

    2) I always recommend hooking up a working computer to the lcd.

    3) What about the other voltages on the power board (i.e. the connector)?
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      #3
      Re: Another broken CTL, flashing LED

      Originally posted by retiredcaps View Post
      1) For the future, when posting the results of the voltage regulator, add the part number so we can tell if the voltage regulators are good or not. We all don't have the eagle eyes of selldoor (although I was able to see enough in your photos to know all 3 are good).

      2) I always recommend hooking up a working computer to the lcd.

      3) What about the other voltages on the power board (i.e. the connector)?
      Okay, sorry about that!

      On the cable going from the power board, 5VSB = 5.10V, 3.37V on the red wire, 0.02V on the orange wire, all the others read 0.00V

      Is it likely that the whine is one of the caps? They're all crap brands: Elite & Lelon

      Comment

        #4
        Re: Another broken CTL, flashing LED

        Originally posted by Pentium4 View Post
        Okay, sorry about that!

        On the cable going from the power board, 5VSB = 5.10V, 3.37V on the red wire, 0.02V on the orange wire, all the others read 0.00V

        Is it likely that the whine is one of the caps? They're all crap brands: Elite & Lelon
        1) Is there a legend (check backside too) that says what the different colors are?

        2) If not, red might be PS_ON (3.3V DC)? If yes, then there is a problem on the power supply because the inverter voltages are missing.

        3) I count 4 diodes in the secondary and 2 in the inverter section. See if the 6 are shorted or not.

        4) The whining could be from capacitors. My HP 22 inch had bad caps and one of them whined.
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          #5
          Re: Another broken CTL, flashing LED

          Originally posted by retiredcaps View Post
          1) Is there a legend (check backside too) that says what the different colors are?

          2) If not, red might be PS_ON (3.3V DC)? If yes, then there is a problem on the power supply because the inverter voltages are missing.

          3) I count 4 diodes in the secondary and 2 in the inverter section. See if the 6 are shorted or not.

          4) The whining could be from capacitors. My HP 22 inch had bad caps and one of them whined.
          I can check to see if there is a legend on the back. Am I checking the diodes for resistance or DC voltage? I might replace the Lelon start up cap to see if it goes away

          Comment

            #6
            Re: Another broken CTL, flashing LED

            Originally posted by Pentium4 View Post
            Am I checking the diodes for resistance or DC voltage?
            Use diode check on your multimeter. You should have 2 readings for each diode.
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