![]() Not sure if what backlight type your screen has? Any other questions? Make sure to contact us. If the fuse is not letting the electric current through, you can either:ī) jump the fuse (replace it with a non-rated filament AKA solder blob) – it will annul the fail switch So, if you have an LED screen with non-functioning backlight, and you have not ordered a replacement just yet, locate and test the fuse with a multimeter (or an LED light, and two wires). It is built to allow a certain amount of electrical current through it but when a stronger current goes through it – and if the pins are shorted the current will equal to the ability of the power supply or the battery (up to 40 amps peak) – the filament would break, and the electricity would stop reaching more sensitive components (e.g. Fuses have a copper filament – similar to a lightbulb. a multimeter set on a continuity setting).Ī typical backlight fuse = 32v 3amps. Once located, it can be tested with the continuity meter (e.g. Typically, this fuse is located on the motherboard right net to the LVDS cable port. Most laptops foresee the possibility of the wires being shorted, so they come equipped with the fail switch, the fuse that guards the 40pin cable against the common ground. The key is being patient and observant.īut how is this relevant to the fuse? Keep reading. When you are reconnecting the cable, make sure not to plug it in upside down: it will not work, and you may short the pins, and your LCD may get damaged. Use both hands, if needed, and slide the connector out in a straight manner. It is absolutely necessary to ensure that this connector is not slanted during the reconnection. The LED screens rarely have a separate power connector for the backlight, so they get the power through the 40-pin cable. As you know, there are two types of LCD screen backlight and all new laptops that have LED backlight type operated screens supply phantom power to the unit, even if the laptop is turned off. the battery and the power adapter) before proceeding with the installation. IPHONE 4S SCREEN LIGHTS UP BUT NO DISPLAY INSTALLYou order and install the LCD with the new one, however, the backlight is still not functional. An LCD test kit will hep you thoroughly test the LCD, but not a lot of people have one at their disposal, and more often than not, it makes very little sense to buy one just to test a single LCD screen.Įach LCD installation video starts with the recommendation to remove all the power sources (e.g. Run the plastic opening tool along the right edge of the battery and pry up at several points to completely separate it from the adhesive securing it to the outer case. Imagine the following: You have an LCD that does not produce the backlight. Insert the edge of a plastic opening tool between the battery and the outer case near the bottom of the iPhone. If your LCD backlight is not working consider the possibility of the LCD not lighting up because of the blown fuse on your laptop’s motherboard. ![]()
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