Screen intereference - Subwoofer/bass related
I am hoping someone can help - i have searched but didnt come up with another similar problem....
Basically, my carPC was all going really well till my carnetix psu went pop. I repaired it and all is well with the PC again.
However, my jbl amp and sound was really messed up. However, i put this down to dodgy wiring and so i ripped it all out and started again - this time its 90% better and sound is no longer a problem.
However, I have, somehow, created a problem with screen intereference. I am gettting horizontal lines across the screen, but this is something I can fix. The big problem is, i believe, power related. Now, when i have music on, I get severe dimming of the screen in time with the music, so when the subwoofers are on the screen "pulses" with the music. The louder I put it, the worse it gets. At one point it even turned the screen off for a second, then back on again. This i can assume is the voltage dropping too low across the screen power input.
Now, what could be the problem? Seeing as it was all working really well before my issue, I am a bit confused. It seems as though the amp is drawing much more power/current than before.
I will,when i get time, pull off each subwoofer in turn and see if its one of the 2 subs, i will take both off and see if the problem goes. But the amp/sub works fine indoors off a battery.
Alternator has been checked and is fine - charges battery.
Battery voltage is fine - sits at 12.5V when car is off, when running I get around 14.5V.
Screen is wired into car power, not from carnetix or PC. Nothing else in the car dims other than the screen (ign switched power)
Any ideas, solutions, or links would be great. Many thanks!