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Changing Serial Number on Logic Board flash

I replaced the logic in my Lexmark E320 but the s/n doesn?t match up to whats on the back and need to update my logic to match it, does anyone know of how or where I might get the right software to do this?

Posted by gordon24 on

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Samsung PS51D6900DM smart TV. Stopped working and the red light flashed. DC/DC chip was burnt on the logic main board, led didn't flash. New board fit, Turns on. LED flashes now NO PICTURE Please help

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, [Exclude the model number] in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
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According to the service manual an error has occured writing to the eeprom on the logic circuit board. I would look at the logic board as a culprit . You may need to check the voltage is correct at the power point and matches the printer required supply voltage. What worries me is what caused the logic board to fail and make a burning smell. Could be a faulty voltage regulator supplying the logic board or a fault in a power board..

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Where did you find the serial number? There are two places - the sticker somewhere on the case, and the firmware record on the logic board. To read the latter, go to the Apple menu and click "About this Mac" In the dialog, click the "More info" button. This will open System Profiler, which will give you the serial number of the logic board along with the model name and identifier, processor type, etc.
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Generally the System Profiler data is definitive unless someone has messed with the system information using Open Firmware (rare, but possible).

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5 Blinks on the logic board LED indicates that possibly the motor has overheated. If you have unplugged the unit and waited minimum of 30minutes before plugging it back in, and it still will not operate, then the logic board will need to be replaced.
I hope this helps

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You could buy the logic board from :-


Good Luck!!


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The way that I have found to fix this problem is to replace the logic board but when you do that, this is where the NVRAM mismatch comes in. Once you change the logic you also have to change the display op panel. That is what is giving you this error. You must change logic and op panel at same time and it will not give that error.

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I can repair your Main logic board. I do repair work on ebay. my I.D. ecking767. Or search for Xerox under Computer and Networking
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