I don't get any image on the monitor. I'd a problem with the cable extension I made, to connect the power supply board with the controller board (here). it wasn't correctly build and it put 3.4v on two pins where there should be ground. I don't know if this may be the casue tho, because now that the cable is well made, the controller board led lights green and when I disconnect the video cable it turns orange, detecting that there's no video signal. I've rechecked the FFCs connecting the controller board and the panel, they seem well connected. Everything is grounded, I'm stuck at what can be the problem.

On the other hand, I've an odd problem with the fan. It runs on 220v. On a fresh connect, it starts spinning ok, but if I disconnect it, and then connect again after a few moments, the fan won't go on, no matter what I do. I've checked the voltage using a multimeter and it's ok. I wonder if this may be a problem about inductances from the fan, the ballast and the relay I'm using. I don't know, any help will be well received.

Thank you in advance!

Did you turn it on with the bad cable? You may (probably) have fried the LCD controller board if you connected 3.4V to the ground wire.

Yes I did. But the controller board yet reacts to disconnecting the video cable. But of course this doesn't asure it's in perfect condiction.

Tricky one.

Check, double check and triple check the FFC connections. It wouldnt suprise me if you fried something by connecting 3.4v to a ground line, though.

As for the fan, you can find out if the ballast is affecting it, by plugging it in to a seperate AC feed when the projector is off. I suspect the problem is in the fan itself, maybe to do with thermal expansion or increased resistance caused by heat. Does it spin-up if you give it a "jump start" with your finger? (Disclaimer: I am not responsible for any fingerless hands caused by trying this).

My fried controller board also responded properly to connecting and disconnecting the video signal, but no display on the LCD.

Couple of things to try:

1) Get rid of your power extension cable and connect the power supply board directly to the controller; it could be noise induced on the long extension cable that is preventing proper operation. If it works, you know your controller is okay.

2) What pins, specifically, did you flip around. I am using the 557 controller with my 567v2 panel so I am familiar with the pinouts ... only two of the pins are actually used by the controller, the rest aren't connected on the PCB.


Let us know the results of the above. I have been through the paces with my benQ so am quite familiar with them. Read my PLOG to see if there is any more useful info there, I tried to chronicle everything.

FFC connections seem ok to the sight, they aren't teared either, as I used cold soldering compound to fix them.

As for the fan, I made the installation so I could make it run having the lamp switched off. I doesn't work either this way. And no, it doesn't start spinning if I manually help it.

Another odd thing I've noticed, is that if I leave the lamp running for, say 2 minutes, then try to switch it off, the stop pulser won't do anything, the current may be cut to the relay, but its contacts may be magnetized or something and stay connected, because the lamp won't switch off. I've to unplug the power cable.

I've used a relay to prevent the lamp from trying to switch on after a power shortage, but after the so many problems it's causing, I'll use two regular switches in serie, one general and one just for the lamp and monitor.

Tried point 1 after I noticed the cable was wrong.


As to point 2:

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If I remember well, only pins 2 and 3 have voltage (3'4v). So looking at the pictures showing how I made the cable, I think the output was like this:

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