Vostro 3560 (LA-8241P) dead short to ground

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  • spleenharvester
    Badcaps Veteran
    • Mar 2010
    • 882
    • UK
    #41
    Re: Vostro 3560 (LA-8241P) dead short to ground

    Originally posted by caspian
    Now you should discover what else gets hot on the board, including CPU, GPU, SIO, and smaller chips.
    Sadly nothing seems to be abnormally heating up - CPU and GPU heat up in a normal way. I have a feeling the GPU is toast as the board does seem to be POSTing to some extent (diagnostic LEDs OK, responds to Ctrl+Alt+Del etc)
    Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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      • caspian
        Badcaps Legend
        • Oct 2015
        • 1589
        • Laptop
        #42
        Re: Vostro 3560 (LA-8241P) dead short to ground

        have you tried the internal screen? Does the hard disk spin?
        Last edited by caspian; 02-06-2018, 02:55 PM.

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          • spleenharvester
            Badcaps Veteran
            • Mar 2010
            • 882
            • UK
            #43
            Re: Vostro 3560 (LA-8241P) dead short to ground

            Originally posted by caspian
            have you tried the internal screen? Does the hard disk spin?
            I still haven't replaced the shorted diode on the backlight driver circuit (QV3) which is currently empty - would I still see output on the LCD without backlight?

            No HDD to test with so unsure if spinning, but I tried an SSD, and there's a brief flicker of the system's HDD activity light but nothing further. Worth noting that there's no USB power, either.
            Last edited by spleenharvester; 02-06-2018, 02:59 PM.
            Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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              • caspian
                Badcaps Legend
                • Oct 2015
                • 1589
                • Laptop
                #44
                Re: Vostro 3560 (LA-8241P) dead short to ground

                There will be no picture on the screen if QV3's circuit is not fixed yet. I recommend repairing QV3's circuit to connect the internal screen. It may display some symptom that leads to a better diagnosis.
                Last edited by caspian; 02-06-2018, 03:34 PM.

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                  • Th3_uN1Qu3
                    Believe in
                    • Jul 2010
                    • 6031
                    • Romania
                    #45
                    Re: Vostro 3560 (LA-8241P) dead short to ground

                    These models will not show video if the internal screen is not connected, and emit an 8-beeps code in the speakers. Please do fix the screen circuit and test with internal LCD before trying anything else on it, the board may be good.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                      Comment

                      • spleenharvester
                        Badcaps Veteran
                        • Mar 2010
                        • 882
                        • UK
                        #46
                        Re: Vostro 3560 (LA-8241P) dead short to ground

                        So I just connected up the internal LCD anyway and... oh my god I'm such a moron the board immediately fired up to Windows 10 on external monitor!

                        Annoyingly I'd already gutted a few other components on the backlight driver circuit so this could be an annoying one to repair... nonetheless, great to finally have an understanding of why this board didn't work

                        Thanks v much - I may be back!
                        Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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