LG W2243s 2sec to black with beep

[gmpout]

Re: LG W2243s 2sec to black with beep

back again after a week
just replaced with a new fuse holder! whats the next step? where to look for shorted components?!

[philliesfan30m]

Re: LG W2243s 2sec to black with beep

are you able to turn it on and still get 2 sec. to black? or are you trying to find out if you blew anything else with the mistake?

[selldoor]

Re: LG W2243s 2sec to black with beep

Ok if you have an old type incandescent filament light bulb you coul build a dim lamp tester. The bulb is wired in series with the power supply and instead of blowing components the bulb lights brightly - if there is no short then the supply powers up as normal the bulb will light then dim as the board powers up. See here
http://antiqueradio.org/dimbulb.htm
- doesnt really need to be that complicated - use a 75 watt bulb if you have one.

If you cant do that then I would at least test the Bridge rectifier for shorts D801

[gmpout]

Re: LG W2243s 2sec to black with beep

no im still trying to figure out what caused the blown fuse! just blew another one just to test it, but this time the led turned red for a sec!

so my priority here is to fix my big mistake :/

[philliesfan30m]

Re: LG W2243s 2sec to black with beep

my guess would be you probably took out a mosfet or 2.

[gmpout]

Re: LG W2243s 2sec to black with beep

and just tested D801 Bridge rectifier and its ok..no shorts

[philliesfan30m]

Re: LG W2243s 2sec to black with beep

i would also check those smaller diodes next to the transformer in the middle of the board. that area right there looks like it got hot at 1 time.

[selldoor]

Re: LG W2243s 2sec to black with beep

Did you check the blue capacitor - post 20?

[gmpout]

Re: LG W2243s 2sec to black with beep

Did you check the blue capacitor - post 20?

multimeter set to 2μF value shown is 8.2?! is there another test i can perform?

[gmpout]

Re: LG W2243s 2sec to black with beep

my guess would be you probably took out a mosfet or 2.

why this could happen? sorry im still learning!

thanks for your help so far

[selldoor]

Re: LG W2243s 2sec to black with beep

multimeter set to 2μF value shown is 8.2?! is there another test i can perform?

Sorry - dont know what that means - do you mean 8.2 on the meter, what does it say on the cap? I want you to test it in Ohms to see if it is shorted.

As regard the mosfets they dont stand up well to power surges and frequently fail short.