Ok I need some help. I have had PJ finished for about 3 weeks and have not had much troulbe out of it. I have watched about 7 movies and played PS2 on it a good bit with no problems. Last night the screen started to flicker on me and its getting worse. I check the temp of LCD regularly and it never gets above 90F even aftre 6 hours of running it stays cool. Anyone have any idea what could be causing this? I use a avermedia tv9 box for VGA converter

I think that depends on the "type" of flicker. What bulb/ballast are you using? Do you think it could be the bulb flickering?

I'm using the sd400 and the electronic ballast from LLstore. The bulb is fine its the image on the LCD screen that keeps flickering. It's like the image flickers on and off in different parts of the screen. I hope that the LCD isnt damaged.

have you done a forum search? I think I remember someone else having a similiar problem. Loose connection? damaged cable? damaged controller board?

Sounds like you have a loose connection. You might check your ffc connections. In the past I have read where people had similar problems and they disconnected and reconnected their ffc cables and that resolved it.

Good luck,
Brian

Oh wow I didnt know they came off but hey its worth a shot. I will pull the LCD and check the connections again. I just had it out the other day and may have loosened one. Are they hard to remove? I've read about them on here and all say how fragile they are

I had flicker on mine when it got 2 hot. Open with a 12" fan blowing in took it away. If you put your hand on the lcd you dont want it to be warm. You might need heat film.

Mine never gets over 90F and this flickering happens as soon as its turned on so ima go downstairs and check all my connections again and hope that one is loose

Ok checked all connections and turned it on. Ran it for 10mins with no flicker and is still running for now. Hopefully there was a bad connection but none seemed loose but hey it looks to be fine for now. Thanks for the help everyone

Once again I have the flicker and all connections are ok. Anyone have any other ideas I can try besides buying a new moitor? Gonna bring PC down and hook it up to see if its the VGA converter and if its not I guess Im through with a home PJ . Cant afford to buy a new monitor every month

how is the power to the LCD wired into your electrical system ?

yesterday, I installed a 17" LCD into my old box... this new LCD came with an internal power supply (compared to the "brick" sytle exernal one for the last LCD i used). I had severe interference problems on the LCD and tried moving the boards around... this helped a little bit (it would come and go) depending on the position of the boards, but in the end I ended up running a seperate power cord from the monitor to the wall. (i.e. no longer tied directly tied into the PJ wiring). This solved the problem... only think I can think of is this "exposed" power card is not as well protected agaist interference as the "brick" style. I will need to go back and try to isolate this board in order to fix this problem...

hope this helps.

Will try that. It worked fine until about 3 days ago. I was just downstairs messing with it and whenever i touched the VGA cord the flicker would go away but when i stepped back it went crazy. I had to take a break before i break it. I put hammer beside it just in case i snap.

Well Ive given up for today. It just seems to be getting worse. I hooked PC up to it and it still flickered so its the monitor.Pluged monitor into a different outlet and still flickered. I guess the screen or the control board is fried but i dont know how to figure out which is bad. It will stop flickering and look fine for a about 30 secs and then get really bad. Anyone know where I could get a control board for a BenQ 557s V2? or another monitor cause I built the PJ around this monitor and I cant find any for sale online anywhere

Don't give up. Mine flickered and it turned out to be my ffc connecter. (I had to make an extender and the first one just wasn't quite right.) From your account, you either have a cable or vga or grounding problem. I don't know how your projector is set up. On mine, I have independent control of the lamp and the LCD. This allows me to turn on the LCD and not get blasted by the light and heat. I removed my lamp assembly and I bought a reflector for general utility work and put a 9 watt flouresent bulb in it. That allows me to see the LCD working. Before trying anything here please read the whole post, especially the last part.

Now it is time to start troubleshooting. First question: are all the different parts of your monitor grounded together? Mine had two boards that were well grounded by the chassis they were mounted on. I had to cut the chassis to make things fit in my box. I had to ground the two chassis parts together for reliable operation. This was even though the boards were grounded by cables connecting them. I don't know why they didn't work reliably, perhaps a ground loop of some kind. I don't think this is your problem but I wanted to throw it out there just in case.

From your description, I don't think the ffc cables are the problem either?

That points at your vga input. Take a close look at the vga connector on the lcd monitor control board. Do any of the solder joints look dull or grainy? Touch them up with your soldering iron (with a very small amount of solder). If you're afraid to do that get a friend with lots of soldering experience to do it for you. If everything looks good there, take a look at the vga connector ends (both the make and the female sides, are any of the connection pins smashed, pushed aside or pushed in? If they are, replace the bad connector. From your description of just touching the vga cable making it work and then letting it go and everything going crazy, I would say one(or more) of your wires inside the cable at the connector has broken and is now making intermittent contact. Have you tried replacing the vga cable?

Hope this helps and provides some more ideas. One last thought, the vga cable isn't so stressed that it is being pulled loose from the connector and thus making intermittent contact is it? Maybe it started out fine, but no strain relief was put on it and over time it became stressed. Bye again.

Still waiting for my final parts.

Oh i'm not gonna give up on it until it is compleetly lost. I tried a new vga cord and still had the same problem. Even when I hooked it up to a different powewr supply it still flickered. Last night everything was messed up. The bulb is pulsing like crazy now when I turn it on so thats another issue. Was thinking maby the ballast is shot. I have the e-ballast from LL store and got so pissed the other day i kept turning it on and off like a dumbass but I get that way sometimes.G onna go over it really good today and check every connection and all. Ya know I have the main board in the metal case it came in Grounded but the little board on the screen isnt I will Ground that first thing today

Ok, you said that when you touched the VGA cord the problem went away? This is most likly a shielding problem then. What your doing when you touch the cord is asding yourself to the cable (basicly) and giving it more area, stoping and grounding any interfernce. The same thing happens when you grab onto a radio antena, you become part of the antena and boost the signal.

What I would do is move your VGA cable as far away from your LCDs power cable, this will cut down on the interference.

Ok. I reconfigured how i had screen and board mounted and made sure everything was grounded good.Turned LCD on and ran for 30 mins with no flicker at all . Turned on light and instantly screen started to flicker and bulb was pulsing. Bulb got about half way lit and blew breaker. Tried to get it to fire for another hour or so with no such luck. How can I tell if I need a new ballast or if I need a new bulb?