Shield your lilliput !!

**Jamez_Warner** · 05-07-2004, 04:53 AM

After finishing my carpc and everything working ,I got out of the car - no central locking - DAMNIT ! what have I done, I see pc shut off and try again - it's fine. OK so its the PC ? tried everything unplugging ignition leads to opus unplugging amps - all sorts. The only thing that made any difference was unplugging the TFT. this got me thinking - my lilli is uncased and mounted in the dash - I tried central locking with lilli out of dash it was fine.

I'm gonna need to shield the backlight inverter tonight....

hoping this encounter might help other people with similar symptoms !

**Laidback** · 05-07-2004, 05:04 AM

Originally Posted by Jamez_Warner

After finishing my carpc and everything working ,I got out of the car - no central locking - DAMNIT ! what have I done, I see pc shut off and try again - it's fine. OK so its the PC ? tried everything unplugging ignition leads to opus unplugging amps - all sorts. The only thing that made any difference was unplugging the TFT. this got me thinking - my lilli is uncased and mounted in the dash - I tried central locking with lilli out of dash it was fine.

I'm gonna need to shield the backlight inverter tonight....

hoping this encounter might help other people with similar symptoms !

Ah, I've noticed this a few times but it doesn't do it every time!

If I stand there watching the screen and repeatedly pressing the button, as soon as the screen goes off, the central locking works! Like I said, not every time though, Strange.

**masch** · 05-07-2004, 05:14 AM

Interesting. Everyone on this thread mounted the screen in dash without using an external housing?

Do you think the backlight inverter is the cause?

**NovaKane** · 05-07-2004, 05:17 AM

is the backlight inverter high AC voltage, because that would make sense. AC voltage, causes magnetic flux...and so on and so forth.

**webnosis** · 05-07-2004, 05:20 AM

Magnetic flux huh! Maybe we should install Flux-Capacitors in our cars to combat the problem...

Sorry, couldn't resist...

**pioneer** · 05-07-2004, 05:27 AM

Inverters for backlights are high voltage AC. i think that the plastic case on the touch screens have a metal coating on the inside to stop interferance, removing the back means that there is no shilding and the high freq AC interfears.

one thing to try is locking the car with the key in the lock, no with the keyfob, if it works like that then the screen is producing radio waves that are gamming the signal from the keyfob.

a bit of mettal that is grounded to the 0v line should combat the interference.

**Laidback** · 05-07-2004, 05:27 AM

Originally Posted by masch

Interesting. Everyone on this thread mounted the screen in dash without using an external housing?

Do you think the backlight inverter is the cause?

Mine's not mounted in-dash

**Enforcer** · 05-07-2004, 05:32 AM

Originally Posted by masch

Interesting. Everyone on this thread mounted the screen in dash without using an external housing?

Everyone one on this thread? prior to your post, 2 people had replied, although technically correct it's not that interesting. Now if there had been 10-15 replies that would have been interesting.

Oh! and subsequently we find out only half of the people who had replied had actually mounted it in dash.

**Jamez_Warner** · 05-07-2004, 05:43 AM

I think its most likely to be the invertor - thinking about it around 3000V of AC unshielded power near car electronics is always a bad idea - I'm wondering whether a layer of foil backed paper soldered to ground around the back would sort this... ( im not shielding expert )
I'm assuming there is a metallic aspect to the "plastic" stock housing

**masch** · 05-07-2004, 05:47 AM

Enforcer : ooh a nitpicker =P

I didnt mount mine, I used a TM701-L case. I've never had this problem before. But then, the car pc is never on if I'm about to lock/unlock it. Are the guys having this problem using a delayed shutdown controller or something?