Having problems with your Lenovo 3000 J115 (7387-A11) Desktop Computer Bundle With AMD Athlon 64 X2 Processor 3800+ With Enhan... (W101787) ?

Monitor comes on for a few second flickers and goes black.

Answers :

I have found the filtering coils feeding the back lamp power supply (inverter) to be stripped of its coating improperly. The coil may be soldered into the board too deep causing the coating to be soldered in the through-hole. This causes a very thin connection and a crack develops. when the screen turns on the joint warms up and the screen backlight turns off because power to the inverter is disconnected. when it cools down it reconnects. this is a hairline fracture in the solder joint. this is the 12 volt dc + line to the inverter. The coil filters out high frequencies by offering impedance to any AC that may be present (interference, noise from nearby devices etc.).
\012If you are comfortable (and knowledgeable) with electronics repair you can remove the back cover and locate this coil. then slightly disturb it to see if your screen flickers on and off.
\012We received a shipment of these screens at work and 6 out of 10 had this problem.
This sounds like your back lights are going out or the power supply section has a problem.
\015\012If you turn the computer on then look at the edge of the screen if you see a ghost image then it would confirm the back light problem. That can be caused by several internal problems. You should check with a different monitor or try your monitor on a different machine to confirm the monitor is the problem. Check your warranty to see if you can get it replaced.
Repair Help & Product Troubleshooting for Lenovo 3000 J115 (7387-A11) Desktop Computer Bundle With AMD Athlon 64 X2 Processor 3800+ With Enhan... (W101787)

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