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I think I just lost a laptop and a TV to a bad HDMI cable.

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    #1

    I think I just lost a laptop and a TV to a bad HDMI cable.

    So, earlier today I had a perfectly running laptop and 55" Hitachi TV. I decided to hook up a 4x1 HDMI switch because my TV only had 1 HDMI input. I hooked it up with known working HDMI cables, but I didn't get any signal. I sat down to do some research and a few minutes later I heard a POP and HISS from the 4x1 switch. I quickly unplugged it, and realized I had put a 12v power supply on the switch when it only required 5v .

    I then plugged my TV back into the cable box like it was originally hooked up, through the HDMI cable that once worked. NO SIGNAL. Thinking it could be the cable box that was not working, I then hooked the HDMI cable into my laptop. The instant the cable went in the HDMI port, the laptop shut off and now it won't come back on. The TV does power on, and gives an on screen display, but will not receive a HDMI signal. It also will not tune into antenna channels either, I just get a black screen.

    I assume it's a mainboard problem with the TV, right? Have anyone ever experienced something like this before?

    TL;DR: I overvolted an HDMI switch on accident, and it fried my HDMI cable/the TV's main board. Not knowing this, I plugged the HDMI cord into a laptop, and it killed that too. Crappy day it's been
    Last edited by mattpd; 02-17-2014, 07:46 PM.
    Tags: None
    #2
    Re: I think I just lost a laptop and a TV to a bad HDMI cable.

    typically, the HDMI switch will suck power from the source, which should feed 5V at up to 50mA through a diode. It's possible that the switch just connects this to 12V, so you could have caused the 5V supply in the TV to fail and shoot up to a higher voltage.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

      #3
      Re: I think I just lost a laptop and a TV to a bad HDMI cable.

      Originally posted by tom66 View Post
      typically, the HDMI switch will suck power from the source, which should feed 5V at up to 50mA through a diode. It's possible that the switch just connects this to 12V, so you could have caused the 5V supply in the TV to fail and shoot up to a higher voltage.
      After possibly destroying the mainboard with the faulty switch, is it possible said mainboard would then cause a laptop to fail catastrophically when connected to the TV via HDMI (switch is out of the picture at this point)?

      Comment

        #4
        Re: I think I just lost a laptop and a TV to a bad HDMI cable.

        That's possible but I think it is reasonably unlikely, I would check other things on the laptop, remove battery and unplug AC, then try again.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

          #5
          Re: I think I just lost a laptop and a TV to a bad HDMI cable.

          Originally posted by tom66 View Post
          That's possible but I think it is reasonably unlikely, I would check other things on the laptop, remove battery and unplug AC, then try again.
          I wish it was that easy. I took the battery out over night, and the CMOS too. No results. Time for a new mainboard and motherboard I guess.

          Comment

            #6
            Re: I think I just lost a laptop and a TV to a bad HDMI cable.

            Well I am spreading a rumour that hdmi is not plug and play and all machines should be switched off /unplugged connected then switched on again.
            Having seen many cases of hdmi killing boards I have told my family and friends
            not to do it.
            Too late for you, sorry, but others might read this and save their sets.
            Maybe you can start a thread for laptop on laptop forum post good clear pictures of the board make model number and NAME of board. Close up of hdmi area.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

              #7
              Re: I think I just lost a laptop and a TV to a bad HDMI cable.

              got to say a freind also had this problem the other night whilst connecting his laptop to a tv with hdmi whilst both units switched on now the laptop just turned of now wont start up at all just a quick flash from a led i think.

              Comment

                #8
                Re: I think I just lost a laptop and a TV to a bad HDMI cable.

                I dont like HDMI for this very reason. Not had any issues Personally, but seen the results and heard the sad tales of problems--Often kids and Playstations/X-Boxes come to mind....
                (Never owned either--and dont ever plan to!)

                At least with SCART (Peritel) the reported incidents of problems were much less--even though the resolution/quality isnt quite the same!
                TELEFIX

                How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                http://www.irf.com/technical-info/appnotes/an-1088.pdf
                PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                  #9
                  Re: I think I just lost a laptop and a TV to a bad HDMI cable.

                  Originally posted by vinceroger69 View Post
                  got to say a freind also had this problem the other night whilst connecting his laptop to a tv with hdmi whilst both units switched on now the laptop just turned of now wont start up at all just a quick flash from a led i think.

                  Yup, all I get is a flash from the power LED every once in a while.

                  Originally posted by selldoor View Post
                  Well I am spreading a rumour that hdmi is not plug and play and all machines should be switched off /unplugged connected then switched on again.
                  Having seen many cases of hdmi killing boards I have told my family and friends
                  not to do it.
                  Too late for you, sorry, but others might read this and save their sets.
                  Maybe you can start a thread for laptop on laptop forum post good clear pictures of the board make model number and NAME of board. Close up of hdmi area.
                  Will do as soon as I get the laptop broken down. I will also post a pic of the mainboard in this thread as soon as I get this insanely heavy TV off the wall.

                  Originally posted by Alastair E View Post
                  I dont like HDMI for this very reason. Not had any issues Personally, but seen the results and heard the sad tales of problems--Often kids and Playstations/X-Boxes come to mind....
                  (Never owned either--and dont ever plan to!)

                  At least with SCART (Peritel) the reported incidents of problems were much less--even though the resolution/quality isnt quite the same!
                  Although I don't plan on doing it again, I have been haphazardly plugging/unplugging HDMI ever since my first HDTV with no problems. I think it was carelessness with the 4x1 switch that caused this whole problem.
                  Last edited by mattpd; 02-18-2014, 01:11 PM.

                  Comment

                    #10
                    Re: I think I just lost a laptop and a TV to a bad HDMI cable.

                    Hi guys,i also got a cheap switch i had no ussues i did not use the 5 volt power though, i did switch manually when i need to switch between ps3 and a sat receiver.But as someone suggeted always turn off sources when connecting switch with the power supply connected.

                    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
                    Last edited by ivtec; 02-18-2014, 01:38 PM.

                    Comment

                      #11
                      Re: I think I just lost a laptop and a TV to a bad HDMI cable.

                      I just ran into a small problem... I was about to buy a replacement Sub Digital PWB, part numberJP50322 (which I have been calling the mainboard in this thread) but noticed it does not contain the HDMI ports. The HDMI ports are actually on the C Main Digital board, part number JP50763.

                      Do you think I need both boards? The TV is a Hitachi 55HDT79

                      Comment

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