LG 50PA4500 not turning on

[Hamie]

Re: LG 50PA4500 not turning on

Does the power supply turn on automatically with the main board unplugged in this model?

Ie, do you get va, and vs voltages without the mainboard?

[supered]

Re: LG 50PA4500 not turning on

Yes with main board unplugged I get va & vs

[supered]

Re: LG 50PA4500 not turning on

Been up all night have to go to sleep I will check back later

[Hamie]

Re: LG 50PA4500 not turning on

Need to check the buffers fully.
More than likely there will be a short.

Here's a quick way to tell if its got a short.

I have 2 identical buffers here one good one had a short.



Notice that 2 of the pins on the top connector ar tied together, the rest are ground.




A good buffer should be very high resistance like this. 205k



Bad buffer low resitance. Like this only 44ohm

[supered]

Re: LG 50PA4500 not turning on

I'm back
To recap.
Tv clicking - shorted ysus board - replaced ysus and buffer boards no more clicking, tv still does not power on.
Pressing power button does nothing (red led is on).
Seems as if it is stuck in stand-by
Verified Vs (206) & Va (55) on power supply- OK.
Verified ysus board across the components and -vy is 190vdc and vsc is 150vdc - OK.
Next was to check buffer boards.
Hamie the boards I have are different than the ones in your photos.

On the upper board I checked the resistance from pin 1 (arrow on board) to the rest of the pins on the 2 connectors. Connection P701 6.6 M ohms, P702 3 ohms.
http://assets.shopjimmy.com/media/ca...748601-TOP.jpg

Lower board has 3 connectors.
P801 (center) 300 K ohms, P802 3 ohms, P803 different measurements from open to 1 M ohms.
http://assets.shopjimmy.com/media/ca...8801-TOP_1.jpg

Am I checking them right.
And thanks again for all your help.

[husky601]

Re: LG 50PA4500 not turning on

No devlopment? I do have a similar problem.