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LCD Dell E176FPf

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    #1

    LCD Dell E176FPf

    hey guys, i'm back!! i have another monitor to repair. this monitor is a LCD Dell E176FPf. The problem with this monitor is that it doesn't turn on at all. I opened it up, checked for bad caps in the power supply, but i can't spot any. i'm attaching pictures for your advice. thanks for all your help guys!
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    #2
    Re: LCD Dell E176FPf

    1) A good fuse measures less than 1.0 ohms. Check it (highlighted in yellow).

    2) If the fuse is good, see if secondary DC voltages appear on the logic part of the board. There are 3 voltage regulators marked in red. Measure each pin except the tab with respect to cold ground (use a mounting screw).

    List the part number and DC voltage for each pin.

    3) If all DC voltages are 0.0 V DC, then measure the DC voltage across the legs of the 100uF 450 V cap (marked in blue). It should be 165 V DC if you are in North America.

    4) What is the DC voltage across the startup cap (circled in lime green)? Is it steady or fluctuating?
    Attached Files
    Last edited by retiredcaps; 12-16-2011, 09:59 PM.
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    Comment

      #3
      Re: LCD Dell E176FPf

      This monitor and equivalents are notorious as unrepairable. The fools who designed the firmware save some operating parameters in program memory - the 8 pin IC with the paint dot next to the processor. Eventually the firmware gets corrupted, and the processor won't work. If the proper voltages are present on the processor end of the card, your only hope is finding a source of a chip with the firmware preloaded.

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

      Comment

        #4
        Re: LCD Dell E176FPf

        i have same model but .....on off button is not working.....seem like firm ware programe fault.if any body have that in bin file.....plz.

        Comment

          #5
          Re: LCD Dell E176FPf

          I there

          I Have one of these to repair, check the mosfet, the resistors from the PWM IC. This is a common problem on this type of Power supplys.

          Compliments

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