I flip the switch of the Lexmark T522 and I get 2 rows of daimonds across the LCD display, but no post(motor function). It does move beyond that point. I have already installed a system board with no better reults.
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Re: Diamonds on the T522 LCD
Do you get 5 beeps when the printer powers up? three things can cause this the control panel, the logic board and the engine board if you have replaced the logic board the engine board is the problem change that and your problem should go away
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do this disconnect the scanner motor plug from the engine board this plug is at the top of the engine board it will be either all white strands or blue black and red standed wires. then see if it powers on. this sounds like the scanner motor is dieing and is shorting out when it gets warm.
LCD displays have one potential weakness (other than freezing temps), and it involves how they are contacted.
The display has a row of sputtered contacts which are nearly transparent that carry the date from a flat cable to the display segments.
These film contacts cannot be soldered and the mating 'connector' is a flat piece of silicone rubber with fine parallel wires embedded within. This is a narrow strip with the conductors running across the width of the strip. One side is pressed against the film display contacts, the other against bared conductors of the data cable.
These are held to the display's contacts by pressure and the initial alignment is critical as is the consistency of pressure across the row of contacts.
Sometimes, this is either not well-braced to avoid the loss of contact or heat can cause their position to drift enough to cause some of the display segments to 'drop out' or, if a supply contact fails, you can have either a totally blank display or one with ALL segments turned on; this latter condition is yours.
If you feel like experimenting and can gain access to the rear of the display, you may be able to influence this problem by loosening or tightening any screws you see holding the flat cable to the back of the display.
If you decide to try it and are successful, it may help others if you would return to this thread and give us a description of your work.
i take it that your getting an invalide engine code error? this is caused usually by the printer taking a power surge. you can get a batch file from lexmark to reflash the engine board however if it will take the code it usually odesnt last to long. change the engine board and your problem will go away