Thread: How To Repair LG Monitor With Power Blink indication

The LG 710E 17 CRT notice came in with the issue of energy flash. A energy flash problems can be cause through either in main or additional element or still in both components.


A faulty energy IC, energy fet malfunction when under fill, higher esr in electrolytic capacitor, improved in present feeling resistor value, a shorted zener diode, a leaking transistor, start routine or resistor has modified value in main area can cause energy to flash. As for the additional area, a shorted additional diode, flyback, HOT, horizontally yoke coils, damper diode, B+ fet, an start narrow capacitor, shorted IC and etc can cause energy to flash as well.


Normally what I do is to eliminate the B+ fet first and hook up a gentle to tell apart whether is the main or after the B+ routine elements that triggered energy to flash. However in this situation, I did not put the gentle and I immediately eliminated the B+ fet and energy on the computer monitor. For your details, this B+ fet is the N-channel mosfet and this B+ fet is element of the increase routine.




After eliminating the B+ fet, not only the energy didn’t flash, there was present as well and the anode present flows about 12 Kilo voltage (a excellent monitor should have about 24 KV). The purpose why you got 12 kilo v is because the increase routine is not performing due to the eradication of the B+ fet. The present proven a little dimension and the horizontally dimension management is already set to the highest possible (you can’t get highest possible dimension because the anode present is only 12 KV). You can management or set everything in the On Display Display (OSD) except you can’t carry horizontally dimension to highest possible.


With having a present, it is a excellent hint to me because I realized that many tour is operating such as energy area (so you never suppose main area anymore), flyback transformer, yoke rings, micro-p, eeprom, directory and horizontally routine, shade routine and even the Osd routine. Without the B+ fet, there is present but with B+ fet the energy flash. In this situation, one would always have a look at the B+ fet first am I right? However the B+ fet became good!


Now where is the purpose hiding? Trouble shooting sometimes can be very disappointed and most of time is always fun. One of my techniques that I liked to use is to touching for any extraordinarily hot elements on panel with my little kids finger. (Please take observe for all digital repairers-switch off and eliminate the energy wire and eliminate the big narrow capacitor in main area before you start to touching any components).