Same thing happened to mine until it permanently went dark - no brightness. Problem is with the LCD display that is defective. As this model does not have a separate filament bulb unlike the non color model, it cannot be repaired. Likely too expensive to replace the color LCD display if avalaible. Next one I buy will be a non color version which has separate bulb.
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I understand that the display on your Frigidaire microwave, model# PLMV168, is dim and you are wondering if there is a way to make it brighter. There is not a way to make the display on your microwave brighter. That is the particular design of your appliance. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your microwave status has changed successfully. Hope this is helpful.
You didn't post the Make, Model of Laptop or the OS? All I can suggest is to Open the Control Panel, select Power Options, set to High performance, Change Plan settings, adjust brightness or when to dim display. If you are on Battery power the displat will dim to conserve battery power. Plugging in will brighten the display. If you have a NVidia Graphics Adapter it can be a bit different. Do ALL your Windows and Laptop Manufacturer's updates.
You didn't specify if you wanted the display brighter in the daytime while headlights are off or if it is too dim when the headlights are on, with respect to the rest of the instrument panel illumination. Too bright is easier to deal with but too dim is tough. If it is always too dim under but daytime and night time conditions the only way to improve brightness would be to very gently disassemble the front panel (easier if it is the removable type) and determine what provides the back lighting. If there are tiny LEDS you could painstakingly add more LEDS or swap them out for brighter LEDS. There could be a lot of guesswork determining if this or that LED was brighter than what is in the unit as built. It may just be easier to live with it as-is.
You should be able to adjust the screen brightness using the "FN" key and the keys that have a sun on them with a arrow up and down. Or you can right click on the desktop and change the screen's brightness in the display properties. And sometimes laptops are set up to automatically lower the brightness when the power properties are set to power saver...like when running on batteries only and no ac power connected.
Try resetting the laptop to default settings in the BIOS. If that don't work, sounds like there's a problem with the backlight in the LCD Display. Most laptops come with Ambient Light Sensors, that can adjust the display based on the lighting in the room.