LG forum



by vpvenkks / March 19, 2015 2:57 AM PDT

All 4 HDMI ports showing NO SIGNAL, and good thing is normal AV cable works. Did factory reset and powered off and on ,, but still having the same issue, logged a complaint with lg. will keep posted. If any one have any solution please suggest.

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All Answers

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There is a sometimes fix.
by R. Proffitt Forum moderator / March 19, 2015 3:17 AM PDT

Remove all connections from the TV. Unplug power and wait 10 or so minutes for the HDMI chips to reset. Now apply power and ONE HDMI connection to what port you want. Hopefully it comes back, if not it's likely to be the usual blown port (new board(s)) repair.

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by LG_Electronics LG staff / March 19, 2015 4:50 AM PDT

Hello vpvenkks.
There really isn't that much that can be advised differently from the advice you have already received. The blown HDMI ports can be caused by hot plugging the units because HDMI ports do carry a DC voltage and hot plugging them can damage the ports. The only other thing to add to the advice you have already have been given is that to establish HDMI Synching, there is a power on sequence which is usually to power on the transmitting device first then the receiving device. If you have your audio going through a Home Theater System or receiver, you would power that on last. However, you also have to be aware that the power on sequence at times is dictated by the length of the power on delay with the unit having the longest power on delay sent first to shorten the amount of time it takes for the units to power on. If that is the case, if you have a way to shorten the power on delay of the transmitting device ( i.e. through a line conditioner or surge protector that has time delayed sockets) that would help. The only other thing may be to check the pins in the HDMI cable. There are 19 pins overall, but pins 1-6 carry the TMDS data that includes both Video and Audio data. The pins that you might want to check are pins # 18 which carries a low voltage power +5V power supply and pin # 19 which is the Hot Plug detect and is responsible for monitoring power up/down and plug/unplug events. Check that these pins aren't bent. The pins are numbered in a zig zag pattern with the top pin being pin # 1 so all the even numbered pins are in the bottom row and odd numbered pins in the top row...IFV

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