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BenQ E176Fpb

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    BenQ E176Fpb

    A few months ago a friend of mine gave me a Dell E172Fpb monitor to have a look at. No backlight, flashing power button. Found the forums and tried everything advised, to no avail. Threw it out. Couple of days ago another friend gave me a Dell E176Fpb. Power button constant green, no backlight (can see the Dell 'Self test feature check' moving around the screen (No video sgnal applied)). Checked all the bad solder joints, all the caps, all the transistors, put it back together, no joy. One of the threads mentions checking voltage at pin 9 of TL1451 dual PWM chip, 0 volts, I started poking around the switch transistors from the video board With my DVM when I noticed through the gaps on the metal housing of the LCD that the backlights were on. Re-soldered the SMT legs of the transistors and all is OK. I can only assume there was a dry joint on one of the transistor legs that caused the fault. Has been on test for about 6 hours so far.
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