MP3Car.com - View Single Post - Lilliput GL-701 & Interference? - Not sound related?

OptimusPrime · 07-07-2007, 01:47 AM

Quote: Originally Posted by Switt23

Things I would check...

1) Make sure all your grounds are good ones. No paint or surface dirt. If the Ground is part of the chasis that is unseen, take a screw driver and scrape the area clean first. By doing so you elminte any chance of clear coating or paint.

2) You mentioned that the RCA's are on the opposite side of the car, do they get close towards the firewall?

The problem sounds definately like a ground loop with a live wire thats always live. If that makes since, your power source is coming off the battery or a fused circut?

You mentioned that the LCD is coming on without the ground... There is a cut somewhere in the wire because that unit shouldn't power on unless it's grounded. So it's grounded somewhere and is picking up interference.

CHECK YOUR GROUND WIRE ON THE LCD!

1) "I am going to try re-earthing again, although i don't think it will make a difference as i made sure my grounding point was a good one (drilled then paint cleaned around the area then bolted to bare metal)." - Yep - I couldnt think of anything better than this...lol

2) (Noise happens when RCA's are not installed, but anyway) Power enters the car approx 6" from the left hand side of the car (through the firewall), then do a 90deg turn straight to the lilliput, RCA's start at the centre of the dash and go in a straight line to the rear of the car.

The RCA's and power cables are about 3" apart at the closest point, but this is unavoidable due to the fact they both plug into the lilliput...

Since my last post i have checked and double checked everything (to the point of running new wires to everything). Still noisey as hell

I have now concluded that it has to be an internal fault within the unit.

I am not going to take it apart, as its still under warranty but due to the fact the radio and TV reception is soooo poor, i have installed my old Head-Unit back into the car aswell.

Sound now goes from the PC to my Aux-in on the head-unit rather than the Lilli. No noise what so ever. (Using the same wires as the Lilli).

So, problem not fixed, but worked-around...

OP

07-07-2007, 01:47 AM	#11
OptimusPrime Newbie Join Date: May 2007 Location: S.Wales, UK Posts: 31	Quote: Originally Posted by Switt23 Things I would check... 1) Make sure all your grounds are good ones. No paint or surface dirt. If the Ground is part of the chasis that is unseen, take a screw driver and scrape the area clean first. By doing so you elminte any chance of clear coating or paint. 2) You mentioned that the RCA's are on the opposite side of the car, do they get close towards the firewall? The problem sounds definately like a ground loop with a live wire thats always live. If that makes since, your power source is coming off the battery or a fused circut? You mentioned that the LCD is coming on without the ground... There is a cut somewhere in the wire because that unit shouldn't power on unless it's grounded. So it's grounded somewhere and is picking up interference. CHECK YOUR GROUND WIRE ON THE LCD! 1) "I am going to try re-earthing again, although i don't think it will make a difference as i made sure my grounding point was a good one (drilled then paint cleaned around the area then bolted to bare metal)." - Yep - I couldnt think of anything better than this...lol 2) (Noise happens when RCA's are not installed, but anyway) Power enters the car approx 6" from the left hand side of the car (through the firewall), then do a 90deg turn straight to the lilliput, RCA's start at the centre of the dash and go in a straight line to the rear of the car. The RCA's and power cables are about 3" apart at the closest point, but this is unavoidable due to the fact they both plug into the lilliput... Since my last post i have checked and double checked everything (to the point of running new wires to everything). Still noisey as hell I have now concluded that it has to be an internal fault within the unit. I am not going to take it apart, as its still under warranty but due to the fact the radio and TV reception is soooo poor, i have installed my old Head-Unit back into the car aswell. Sound now goes from the PC to my Aux-in on the head-unit rather than the Lilli. No noise what so ever. (Using the same wires as the Lilli). So, problem not fixed, but worked-around... OP