Question about Canon LV 7355 Multimedia Projector

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Hi, I have a convergence problem with my Canon Projector- colours don't overlay properly. What could the cause be?

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That mean the lcd panels are not aligned. If you display a crosshatch test pattern you'll see by how much its out. if its within half a pixel its considered within specs.

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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Our club owns a Canon LV-7240 which has worked OK. Last night we showed an NTSC DVD from Europe and no red showed. We could see what the colours ought to be on the laptop screen. On the big screen,...


Can't answer for the menu issues, but I can garuntee this is not a problem with brightness, contrast or sharpness, and very unlikely that you'll find a solution in the menu. What is likely is that the VGA wasn't plugged in properly initially. When the signal is going down the VGA it's broken up into 5 seperate signals, Red, Green, Blue and 2 sync signals. What is likely is that the green and blue pins havn't properly made contact either inside the projector or inside the laptop. This would also explain why it worked when you tried later because it made the connection properly. I would suggest trying again with the same laptop, if it does it again, try another PC without moving the projector or the VGA connector that's plugged into the projector. This will atleast narrow down your problem, but it doesn't sound like a problem with the projector to me. Also try plugging the laptop that wasn't working properly into a monitor (this will test the laptop)

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If you are having "shadowing", this indicates a convergence problem in the LCD optical engine. Convergence is the correct alignment of all panels so there is no shadowing, or at worst limited to a one pixel shift. Some models can be adjusted, others cannot depending on the optical engine.

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Hi I am vortash sounds like you have a convergence problem and I am guessing you dont have the manual for this set .. there is one available free from http://www.safemanuals.com
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The grid (called an overlay) is put in place to fine-tune one of the colors, usually green. Once one color is adjusted perfectly, the other 2 colors are adjusted to match the first color. For example, if the convergence data is completely erased, the tech will set up the overlay and align the green using to the overlay, and then align the red to the green and then the blue to the green. If the alignment is being done after replacing the convergence IC's because one or 2 colors are slightly off in the corners, the green is usually very close to perfect and the use of the overlay is not absolutely necessary. It is pretty easy to align one color using the outer edges of the screen itself. If you do need the overlay it can be purchased from any Hitachi parts distributor such as Herman Panson, Fox or Union Electronics.

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1 Answer

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These sets quite often lose their memory and can be adjusted with remote control , but , MORE often I have to change the convergence amplifiers. There are two amps with 3 channels each for the up/down left/right for each colour . You did not say if the blue was curved with this displacement , if so AMP or fusible resister . If resister open I will change the amps as a pair. You will need to clean the old heatsink grease off(it will be baked on) and apply a fresh thin coat .

Sorry not for the faint of heart or lack of soldering/desoldering
experienced .
The remote control buttons change their functions when in convergence adjust mode . Let me know If you want the overlay and instructions to adjust.

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