High Line System Dead - Help!

Dr Funk · 5th January 2013, 13:26

I was in my car about to drive off with the radio on when the system seemed to switch off. I could not switch it back on again. The backlight on the screen was on and there were signs of life from the autochanger, satnav and amps (quiet background speaker hiss). That was a couple of months ago and I have not had much luck since.

The units were dry, though the car had been damp due to the sunroof drain issue but this had soaked the carpets but not the spare wheel area. The battery had run flat and had just been charged in situ when this first happend.

I took the car to Huets (car audio specialists) who could not find the fault so they sent the units off to their repair company. The result was that the TV tuner was blamed but not repairable. I took the tuner home and had a poke around with a soldering iron although everything looked fine I wanted to eliminate dry joints on connectors etc.

They refitted the system and it all worked! Well for a few days until my battery went flat again (yes I'm going to change it!!). After charging the battery the system came on but after a few seconds the screen went blank with a white stripe at the bottom for a few seconds before going off completely. The radio was still working but the controls had frozen, and switching the ignition off and on again left me with a dead system again, just sat nav autochanger and amps showing signs of life and screen backlight.

I took out the TV tuner and did the soldering iron thing, no effect this time, also did the same as much as was possible with the head unit and Radio tuner also to no effect.

Next I bought a Hybrid TV tuner, as expected this did not work, but I don't think it is the TV tuner at fault.

I had found some discusion regarding the k-bus signal but having checked the wiring there seems to be no damaged connections as far as can be seen I have used contact cleaner / lubricant on all connectors. The only thing I could find was where the loom has been hacked into near the head unit but this was I assume for a nokia bluetooth unit and on inspection the connections are neat soldered and covered in self amalgamating tape.

At this point I suspect either the loom or the head unit, I would like to get a widescreen but best to find the problem before spending any more money.

Now I could really do with some help as I would like to verify if my hybrid tuner works and also the best way forward to get to the bottom of the issue. There is a BMW system on ebay which would give me a chance to swap out all the units at a price but ideally if there is someone in the Sussex area with a working highline system that would be prepared to have a swapping session I would be very grateful!

5th January 2013, 13:26	#1
Dr Funk Newbie MG ZT-T 190SE, Truimph Sprint ST 1050 Join Date: Apr 2012 Location: Brighton Posts: 15 Thanks: 0 Thanked 0 Times in 0 Posts	High Line System Dead - Help! I was in my car about to drive off with the radio on when the system seemed to switch off. I could not switch it back on again. The backlight on the screen was on and there were signs of life from the autochanger, satnav and amps (quiet background speaker hiss). That was a couple of months ago and I have not had much luck since. The units were dry, though the car had been damp due to the sunroof drain issue but this had soaked the carpets but not the spare wheel area. The battery had run flat and had just been charged in situ when this first happend. I took the car to Huets (car audio specialists) who could not find the fault so they sent the units off to their repair company. The result was that the TV tuner was blamed but not repairable. I took the tuner home and had a poke around with a soldering iron although everything looked fine I wanted to eliminate dry joints on connectors etc. They refitted the system and it all worked! Well for a few days until my battery went flat again (yes I'm going to change it!!). After charging the battery the system came on but after a few seconds the screen went blank with a white stripe at the bottom for a few seconds before going off completely. The radio was still working but the controls had frozen, and switching the ignition off and on again left me with a dead system again, just sat nav autochanger and amps showing signs of life and screen backlight. I took out the TV tuner and did the soldering iron thing, no effect this time, also did the same as much as was possible with the head unit and Radio tuner also to no effect. Next I bought a Hybrid TV tuner, as expected this did not work, but I don't think it is the TV tuner at fault. I had found some discusion regarding the k-bus signal but having checked the wiring there seems to be no damaged connections as far as can be seen I have used contact cleaner / lubricant on all connectors. The only thing I could find was where the loom has been hacked into near the head unit but this was I assume for a nokia bluetooth unit and on inspection the connections are neat soldered and covered in self amalgamating tape. At this point I suspect either the loom or the head unit, I would like to get a widescreen but best to find the problem before spending any more money. Now I could really do with some help as I would like to verify if my hybrid tuner works and also the best way forward to get to the bottom of the issue. There is a BMW system on ebay which would give me a chance to swap out all the units at a price but ideally if there is someone in the Sussex area with a working highline system that would be prepared to have a swapping session I would be very grateful!