TL;DR: Just touching the metal part of the hdmi cable to any metal part of the laptop's hdmi, ethernet or usb makes the power adaptor stop working. When I turn the main power off and on again it starts working again.
I got a 1440p 160hz external monitor a few months ago and had to get an hdmi 2.1 cable as older ones I had didn't work properly. It worked fine with the laptop for the past 6 months. Now whenever I connect the hdmi, it stops the power adaptor from working, dropping the laptop to battery mode which significantly affects the performance. I did some troubleshooting and these are what I found out:
# The adaptor completely stops working. Just unplugging from the port and reconnecting doesn't work. Have to turn the main power off and on again to make it work again. If the hdmi is connected, it goes out again.
# I have a 150W adaptor (20V x 7.5A). Didn't get another 150W in time so had to get a 180W from a friend to test. It worked fine with that. I'll get a 150W to test in a few days if needed.
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# I connected the laptop to 2 TVs with HDMI cables that were being used with the TVs and it worked fine. Even 4K 30hz and 60hz at a slightly lower resolution worked (these are older cables - "high speed with ethernet" ones compared to the "ultra high speed with ethernet" one I normally use). But when I tried connecting the TV with the HDMI 2.1 I had, the same issue occurs.
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# I connected the laptop to 2 TVs with HDMI cables that were being used with the TVs and it worked fine. Even 4K 30hz and 60hz at a slightly lower resolution worked (these are older cables - "high speed with ethernet" ones compared to the "ultra high speed with ethernet" one I normally use). But when I tried connecting the TV with the HDMI 2.1 I had, the same issue occurs. Edit: just tried with the 1080p TV again with its HDMI cable and the adaptor stopped, so it's not just the other cable or monitor.
# This issue occurs even if the monitor is off. But it doesn't happen if one end is unplugged.
# The display does get output even after all this. Even after it enters battery mode.
# When using the power, without any hdmi connected, the trackpad starts lagging when the laptop hits a higher load. This does not occur in battery mode.
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# This is the main point. I opened up the laptop to try clean the ports and when that didn't work, I noticed that just touching the cable to any part of the metal housing of the hdmi port stops the adaptor. Then I tried touching it to the RJ45 and the USB ports and the same issue occurs. Again this is only if the other end of the cable is connected to the monitor, even if it is off, probably completing a circuit. But I believe hdmi doesn't conduct power through the shell? Correct me if I'm wrong.
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# This is the main point. I opened up the laptop to try clean the ports and when that didn't work, I noticed that just touching the cable to any part of the metal housing of the hdmi port stops the power adaptor. Then I tried touching it to the RJ45 and the USB ports and the same issue occurs. Again this is only if the other end of the cable is connected to the monitor, even if it is off, probably completing a circuit. But I believe hdmi doesn't conduct power through the shell? Correct me if I'm wrong.
What could be the issue here? At first I thought it was either the hdmi cable or the power adaptor but after the 7th observation, I think there's some issue with the laptop. I'm planning on taking it to a repair centre but I'd like to have an idea on what the issue might be and the possibility of if and how it can be fixed.
TL;DR: Just touching the metal part of the hdmi cable to any metal part of the laptop's hdmi, ethernet or usb makes the power adaptor stop working. When I turn the main power off and on again it starts working again.
I got a 1440p 160hz external monitor a few months ago and had to get an hdmi 2.1 cable as older ones I had didn't work properly. It worked fine with the laptop for the past 6 months. Now whenever I connect the hdmi, it stops the power adaptor from working, dropping the laptop to battery mode which significantly affects the performance. I did some troubleshooting and these are what I found out:
# The adaptor completely stops working. Just unplugging from the port and reconnecting doesn't work. Have to turn the main power off and on again to make it work again. If the hdmi is connected, it goes out again.
# I have a 150W adaptor (20V x 7.5A). Didn't get another 150W in time so had to get a 180W from a friend to test. It worked fine with that. I'll get a 150W to test in a few days if needed.
# I connected the laptop to 2 TVs with HDMI cables that were being used with the TVs and it worked fine. Even 4K 30hz and 60hz at a slightly lower resolution worked (these are older cables - "high speed with ethernet" ones compared to the "ultra high speed with ethernet" one I normally use). But when I tried connecting the TV with the HDMI 2.1 I had, the same issue occurs.
# This issue occurs even if the monitor is off. But it doesn't happen if one end is unplugged.
# The display does get output even after all this. Even after it enters battery mode.
# When using the power, without any hdmi connected, the trackpad starts lagging when the laptop hits a higher load. This does not occur in battery mode.
# This is the main point. I opened up the laptop to try clean the ports and when that didn't work, I noticed that just touching the cable to any part of the metal housing of the hdmi port stops the adaptor. Then I tried touching it to the RJ45 and the USB ports and the same issue occurs. Again this is only if the other end of the cable is connected to the monitor, even if it is off, probably completing a circuit. But I believe hdmi doesn't conduct power through the shell? Correct me if I'm wrong.
What could be the issue here? At first I thought it was either the hdmi cable or the power adaptor but after the 7th observation, I think there's some issue with the laptop. I'm planning on taking it to a repair centre but I'd like to have an idea on what the issue might be and the possibility of if and how it can be fixed.