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the light won`t go out as the catalytic function is monitored by sensors and if the monitors don`t see efficiency within set range the light will go on. if you remove the bulb you won`t know if any other codes are being set and the light test when you turn on the key is part of the e-test it will fail and you will have to fix it anyways.
I can tell I have repaired a lot of monitors in my time what you have to do is tear it down, see if any of the capacitors are puffy, if they are replace them. You can buy repair kits for LCD tv;s most folks throw them out. I get them out of the garbage all the time and just fix the capacitors on the boards and they work fine after this. However if you are not good at doing this sort of thing your investment will warrant a throw away product. By the time it is said and done, The cost of repair you can get companies that do this online for under $50.00, for the parts and repair. It is worth it or just go and buy another monitor or get the repair kits for your model. LCD repair accessories and parts that is what I use to do the repairs.
What to you mean by Monitor won't go on? Are you saying the power on the monitor will not turn on? Are you saying the Monitor is on, but there is nothing showing on the screen? Also it would help if we know what kind of computer and what operating system.
What to you mean by Monitor won't go on? Are you saying the power on
the monitor will not turn on? Are you saying the Monitor is on, but
there is nothing showing on the screen? Also it would help if we know
what kind of computer and what operating system.
First thinkg I'd do is to connect an external monitor to the laptop to see if you can get an image, any image, during booting. If you can't see anything, either using the laptop's screen or external monitor, then you have a hardware failure in the laptop that's probably beyond the abilities of a novice to repair. Get somebody who knows about how to clear the CMOS of the laptop.