Need help with EMF(???) interference

scanboy · 26th January 2006, 10:11 PM

I have just finish building my projector (been waiting for this moment), but when I flip the switch on, I can't get a clear picture from the LCD

After taking the LCD out of the box, the picture starts showing again, I then realized it might be the ballast that is interfering it.
Does anyone has this kinda experenience? I wonder what I can do without modifying the box too much. I am using LL's lamp with their electronic ballast. I've left out a lot of details in the bmp, but this is how it is setup: light goes from left to right (obviously), and the lamp has its own enclosure, with the PCB of LCD sitting under it, all the wires goes between the LCD and PCB. The ballast is mounted vertically isolated from the lamp (with wood), but not from the LCD.

Is it the LCD, the wires between LCD and PCB or the PCB board that is being interfered?

snortonnorton · 26th January 2006, 10:22 PM

is it simply plugged into the same outlet? maybe avoid that and it will stop?

man, i hope i don't run into this problem myself when i construct mine.

scanboy · 26th January 2006, 10:38 PM

I have a power strip inside the box with a single power wire going out to the wall outlet. I am not sure if this is the cause, but you just gave me another idea to try.

politicorific · 27th January 2006, 04:24 AM

Absolutely what your describing is interference. My 2nd LCD had this problem - bare wires instead of grounded cable. Course I didn't realize it until I broke my LCD thinking it was the ffc.

Try building a metal shield around the ballast and ballast wires. Couple bucks of material and you should be fine, although heat may be an issue.

scanboy · 27th January 2006, 05:51 PM

Thanks, I will pick up some sheet metal from HD and cover them up. I hope this will solve the problem.

26th January 2006, 10:38 PM	#3
scanboy diyAudio Member Join Date: Aug 2005	I have a power strip inside the box with a single power wire going out to the wall outlet. I am not sure if this is the cause, but you just gave me another idea to try. __________________ Delay no more

27th January 2006, 05:51 PM	#5
scanboy diyAudio Member Join Date: Aug 2005	Thanks, I will pick up some sheet metal from HD and cover them up. I hope this will solve the problem. __________________ Delay no more

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26th January 2006, 10:22 PM	#2
snortonnorton diyAudio Member Join Date: Dec 2005 Location: tallahassee	is it simply plugged into the same outlet? maybe avoid that and it will stop? man, i hope i don't run into this problem myself when i construct mine.

27th January 2006, 04:24 AM	#4
politicorific Account disabled at member's request Join Date: Aug 2005	Absolutely what your describing is interference. My 2nd LCD had this problem - bare wires instead of grounded cable. Course I didn't realize it until I broke my LCD thinking it was the ffc. Try building a metal shield around the ballast and ballast wires. Couple bucks of material and you should be fine, although heat may be an issue.

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