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[SOLVED] 820-2796 - No Backlight

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  • #16
    Sorry, Duke.
    Resistance to GND on pin 1 of U9000: 1.005 Ohm (Ω)
    Attached Files
    Last edited by menatwork; 05-17-2016, 04:48 PM.

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    • #17
      That seems fine. What is the history on this board? Liquid?

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      • #18
        no, it's not liquid damage. I just replaced the screen only. screen is good. but does not have video/back light. just sound and external video.
        Last edited by menatwork; 05-17-2016, 05:52 PM.

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        • #19
          Was the screen replaced because it was cracked? How did this problem start?

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          • #20
            Yes. I replaced bc the screen is cracked.
            I can't figure the problem.

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            • #21

              F8000:
              8.38V


              J9000:

              Pin 01 - 0.16V
              Pin 02 - 0
              Pin 03 - 0
              Pin 04 - 0
              Pin 05 - 0
              Pin 06 - 0.13V
              Pin 07 - 0.11V
              Pin 08 - 0.11V
              Pin 09 - 0.11V
              Pin 10 - 0.12V
              Pin 11 - 0.12V
              Pin 12 - 0
              Pin 13 - 0
              Pin 14 - 0
              Pin 15 - 0
              Pin 16 - 0
              Pin 17 - 0
              Pin 18 - 0
              Pin 19 - 0
              Pin 20 - 0
              Pin 21 - 0
              Pin 22 - 0
              Pin 23 - 0
              Pin 24 - 0
              Pin 25 - 0
              Pin 26 - 0
              Pin 27 - 0
              Pin 28 - 0
              Pin 29 - 0
              Pin 30 - 0.17V

              Q9807

              Pin 1 - GND
              Pin 2 - BKLT_PLT_RST_L - 0V
              Pin 3 - LCDBKLT_EN_L - - 8.03V
              Pin 4 - LCDBKLT_DISABLE - 0.20V
              Pin 5 - LCDBKLT_EN - 0V
              Pin 6 - LCDBKLT_DISABLE - 0.22

              Q9806:

              Pin 1 - PPBUS_SW_LCDBKLT_PWR - 0V
              Pin 2 - PPBUS_SW_LCDBKLT_PWR - 0V
              Pin 3 - LCDBKLT_EN_DIV - 8.14V
              Pin 4 - PPBUS_S0_LCDBKLT_FUSED - 8.38V
              Pin 5 - PPBUS_SW_LCDBKLT_PWR - 0V
              Pin 6 - PPBUS_SW_LCDBKLT_PWR - 0V

              R9808:
              300K

              R9809
              147K


              U9000

              Pin 1 - LCD_IG_PWR_EN - 0v
              Pin 2 - PP3V3_S5 - 3.30V
              Pin 3 - PP3V3_S5 - 3.30v
              Pin 4 - PP3V3_SW_LCD_UF - 0V
              Pin 5 - PP3V3_SW_LCD_UF - 0V

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              • #22
                Right, was the old assembly working and just cracked? What is the old if you connect it now?

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                • #23
                  The same problem - no video/back light

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                  • #24
                    I just order a new assembly.
                    i cant believe the problem is the board .

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                    • #25
                      both assembly I installed earlier were bad , I installed New Assembly again and everything works fine now .
                      Thank you Guys for all advice.

                      Comment


                      • #26
                        Originally posted by JorgePayar View Post
                        Im not an engineer and I undestand 1.003 MΩ ( 1MΩ)
                        Just want to make a request that we try to understand what we don't understand before we make comments like this. Not a huge deal, but let's be good students here. I'm gonna go ahead and posit that if dukefawks says it doesn't make sense, it probably doesn't make sense. Diode mode doesn't measure resistance, it measures voltage drop to ground if the positive lead is on ground.

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