As you know, the principle of operation of liquid crystal (LCD) monitors is based on the passage of light through matrix filters. Thus, the image is formed. The most common LCD monitor failure is the failure of the backlight. How can I check it?
It is necessary
screwdriver
Instructions
Step 1
Look at the monitor. If the brightness of the screen has dropped sharply (usually on one side) or the image on the monitor has acquired a pink tint, then the cause of the malfunction is in the lamp, which illuminates the image from below.
Step 2
Entrust the verification of the malfunction of the monitor backlight lamp to professionals, since all parts are of a rather fragile structure. You can damage the matrix with a careless movement. If you decide to test the lamp yourself, be extremely careful. The cable connecting the lamp to the matrix is high voltage (1000 volts).
Step 3
Before starting to check the health of the lamps, prepare the workplace: it must be dust-free. The penetration of dirt and dust on the matrix is inadmissible.
Step 4
Check the connection of the ribbon cable to the motherboard with the monitor. Unscrew the monitor frame, which is secured with screws under the rubber caps. The connection must be made properly.
Step 5
Make sure it is the backlight that is faulty. To do this, connect a working lamp to the matrix or connect the matrix to a working backlight module.
Step 6
Remove the protective film that covers the board. Do this very carefully, preferably with a scalpel or tweezers. The matrix is a very thin plate with conductors that cannot be restored if damaged.
Step 7
Take out the matrix, light filters, and then a pencil case with lamps, which are mounted in a pencil case, two at a time. On a burned out lamp, black wide rings will be visible near the cathodes. Be careful not to break the lamp, as fragments of it can damage filters and reflectors.
Step 8
Try lightly pulling the lamp out of the pencil case. In the event of a resource depletion, the lamp begins to heat up strongly. So much so that, due to heating, the cathodes can even melt and stick to the matrix. By the temperature of the device or the presence of melted fragments of the body, one can also judge the health of the lamp.
