Question about LG 500LC Monitor
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Posted on Jan 02, 2017
SOURCE: MONITOR REPAIR HELP
The mains switch is a weak link on these, check this first. Also 1 of 2 33K 2W startup resistors in PSU goes o/c, check with DVM or if you have very high volts on main primary res cap this usually indicates a 33K has gone - change both. I've also had a small TO92 transistor hanging off the UC3842 failing causing no startup. A s/c HOT normally causes a blinking LED. note that AC cap IS charged, DISCHARGE BEFORE WORKING ON IT! Did you check for shorts in the secondary side of the p/s, horiz output? If there are none , look for the switching regulator. Check the support components. I've seen these with open solder connections on the coils in the PS due to that abominable glue they use...you'll see signs of burning/arcing on the inside of the cabinet, too. Good luck
Posted on Apr 11, 2006
SOURCE: Help on monitor repair
Have you checked the horizontal output transistor for a short or leakage?? most of these sets will not start up unless the horizontal sweep sends the pulse to the power supply and says start me up!! I would look at bthe drive as well on the horiz. curcuit. If theres a pulsating voltage that means its waiting for something to signal it to work or its missing something.. Good luck
Posted on Apr 23, 2006
SOURCE: Monitor is totally dead
Through my past experience I mwould remove the solder point at the input power B+ line to primary winding FBT. If the HOT has shorted there will be no power.Straight to the point if you know where the HOT is , you can desolder the middle pin or collector of the HOT transistor. If you desolder the pin which result the power led light turn up. That indicates either FBT or HOT has shorted
Posted on Apr 19, 2008
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