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Hp 1000 backlight problem

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    #1

    Hp 1000 backlight problem

    I have this hp1000 6050A2493101-MB-A02 with no backlight. I have got all the voltages at the lvds connector, 19v, 3.3v but still no backlight.
    Can anyone point me to where I can locate the Backlight enable pin at the back of the LED screen?
    Tags: None
    #2
    Re: Hp 1000 backlight problem

    Still waiting for an idea

    Comment

      #3
      Re: Hp 1000 backlight problem

      Ok if you dont have schematic then download the data sheet for the led and check.You have 200 posts so your not new to repairs.
      Have a look at page 38
      Attached Files

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        #4
        Re: Hp 1000 backlight problem

        Pin 22 is enable and should be 3,3v
        pin 21 pwm should have 1,5-3,3v it`s brithness control
        pins 1,2 should be 3.3v lcd power supply
        pins 23,24 should be 19v backlight power supply

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          #5
          Re: Hp 1000 backlight problem

          Thanks cyberhack and Djosla, I already have the schematics of this board and up on checking the connection shown on the schematic on cn503 is not what is on the board.
          pin22 which is LCD_BKEN is 3.3v, pin1,2 which is LCDVDD is 3.3 but the 19v backlight power is not at pin 23,24 it is rather at pin 29,30. I have checked different kind of schematics is it is the same configuration.

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            #6
            Re: Hp 1000 backlight problem

            First is CN503 on the pcb a 30 pin and you have removed the led ie unpluged it
            as it will damage with 19 volts going to the led make sure you have the right schematic
            i would download the led data sheet .

            Comment

              #7
              Re: Hp 1000 backlight problem

              Maybe quanta got all this schematics wrong, the pin 29 and 30 is the 19v Lcd Power, not pin 23,24 as stated in the schematic. I have been able to resolve the problem,
              I noticed that there was no voltage at pin21 which is PCH_LCD_PWM, so I realized this voltage is supposed to come from the PCH so I soldered PIN 22 and 21 together and now backlight is on. I just didn't want to reflow the PCH. Thanks to all of you. I hope you can keep it for reference.

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                #8
                Re: Hp 1000 backlight problem

                it saved me now.. thanks

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                  #9
                  Re: Hp 1000 backlight problem

                  Thanks cyberhack, it saved my day

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