LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

It looks that way and the PFC must be working.
Did you test all the pins on the top two connectors with the VA & VS did you use the
panel ground tabs for the black lead - try again with a screw in.

Next locate where the parts are in Vinces repair pack - you have tested the two white
resistors are those two of the resistors already tested and the fuse - and the diode.

I actually re-tested the VS, just for sheets and greens. I hooked the red lead to the VS and the black lead to the GND on the connector.. Still dead...

Unfortunaltey, I don't have the equipment to check diodes.. YET

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

What if I were to pull the connector from the mainboard and short the ON pin to ground to see if the unit is actually being turned on??

[selldoor]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

It looks that way and the PFC must be working.
Did you test all the pins on the top two connectors with the VA & VS did you use the
panel ground tabs for the black lead - try again with a screw in.

Next locate where the parts are in Vinces repair pack - you have tested the two white
resistors are those the two resistors in the pack you also tested the fuse the fuse -
so can you find and test the diode.
Can you read the part number on the IC301

EDITLast para edited

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

All 3 big caps show 397v +/- 1 or 2 when the unit is plugged in..

Is that a good indication that it is turning on at plug-in??

[selldoor]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Should have said it is sometimes usual when it is just plugged in for the caps to read
mains voltage x1.41 vdc approx then when you switch on it should rise to near 400vdc

[selldoor]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Well I dont think its possible to have voltage at the BIG cap if there is no ac at the bridge.
Test the Big Caps - all3

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Well, it's plugged in.. It's one that has those "touch sensor" controls and I am not entirely positive I am actually turning it on...

[selldoor]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Plugged in and switched on?

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

The right Bridge Rectifier is pretty much the same as the left...

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

The AC is dead as a doornail...

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Seems to be all over the map...

http://sjfm.us/temp/50PK540-16.3gp

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

If the pins are visible/ touchable from the top of the board set your meter on 600vdc and
test the outer two pins. VERY carefully!!
THEN metre on 600vAC test middle two pins. should be same as mains voltage.

OK I am going to attempt this....

The outer pins for DC, the inner pins for AC..

What should I see??

[vinceroger69]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

http://www.ebay.ca/itm/LG-Power-Repa...item1e7a9db08a
i wonder if this kit will sort it?
kit contained 1 fuse (F302), 1 diode (D304) , two power resistors (R927, R929) and the IC301 voltage regulator IC.(found on another post)

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

does the relay click on once when you turn it on or does it click back off?

The relay double-clicks when I plug it in... But nothing appears to happen visually or audibly when I push the power "button"..

[vinceroger69]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

does the relay click on once when you turn it on or does it click back off?

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Grrr.... Looks like I am just replacing the whole board.. Well, at least I know that it's likely the problem..

[vinceroger69]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

They all look ok then.

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Green 10 ohm +/- .2

Red .1 ohm +/-.2

[vinceroger69]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

With power off and on ohms mode on meter.

[Michale32086]

Re: LG Plasma 50PK540 Lightning Victim LED Light Relay Clicks On Plug In Nothing Else

Just in case you were wondering or anyone spots it the test for the bridge was not quite correct - It was ok for testing for a short but to test correctly meter should be in Diode mode - hence the reason for reversing the leads should show something one way and infinity when the leads swapped.

Ahhhhhh Makes sense.. Sorta