Troubleshooting DELL E173FPB LCD Monitor with power blink symptom is quite easy if you know the right procedure to test it. There are two sections in the monitor that can cause power to blink. It is either primary or secondary section or even sometimes both sections can be faulty. So to isolate as which section is giving problem. I used an automobile 12 volt light bulb (brake light) and connect it between the 12 volt supply line and cold ground with the fuse removed. If the bulb still blink chances is very high the power primary section have problem.
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A couple of things would normally cause this problem. First one is the filter caps situated in the secondary section of power supply. Another one is the primary section’s large capacitor. So check/test these items and replace if necessary.
(1) The keyboard- The keyboard is a very sensitive part of the laptop. On several occasions, I have had difficulties in typing some alphabets or keys but to no avail. Only to find out after cleaning that the disturbance is a crumb of burger, bread or cookies. To clean your laptop keyboard, you will need a can of compressed air, a soft clean and damp cloth and a pin or toothpick. Use the soft clean and damp cloth to cover the pinhead or toothpick and use to trace along the small gaps between the keys to displace any dirt that might be trapped by the keys. Once that is done, spray the key board with the can of compressed air to further remove any unwanted dirt’s.
After opened up the cover, I check the on/off signal from the mainboard to the inverter board. With signal cable in, there was no on/off signal to the inverter board but when the signal cable was disconnected, you could see clearly from your meter there is a on/off signal going into the inverter board thus the display appeared with the check signal OSD present at the display. From this test, it is very obvious is the main board problem.
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For that reason, do not let the power circuit or the inverter board of monitors to frighten you away. It truly is manageable and rather straightforward to handle LCD monitor repair by your self self. Nonetheless, there is always the choice of employing a technician should you believe that’s the most effective alternative for you than purchasing a new one which will cost you more.