LG 50PA4500 Clicking troubleshooting HELP please...

[Hamie]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Yeah m-on and stby
Sometimes it's printed a bit clearer on the underside of the board.

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

I'd like to pick up where this thread left off: got the same model LG with the same symptoms. PSU P/N:EAY62609701
Have disconnected all cables to psu except line voltage and jumped M.ON to STBY
The relay clicks twice and there are no output voltages except 5.2vdc STBY

[Brentsky]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Do you have a way to take an up close picture of your TV's power supply ?

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Both sides?

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

My psu

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

...and this

[Brentsky]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Replace C802 Capacitor (circled in the photo below) It can be found on ebay.

223J@1250V HIGH PULSE. If your unable to perform this repair I can assist you if needed.

[Brentsky]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

By the way this is turning into a common problem with this model of power supply.

[tom66]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Thanks for the info very useful. The poly cap in a lot of these half-bridge type power supplies is a frequent failure. Some models seem immune and yet others have tons of issues. Wonder why, seems like it might be a parts sourcing/quality issue rather than a design issue. Have seen 15+yr old PSUs with those caps still OK.

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

So it looks like that cap is a .022uF @ 1.25kvdc pp. I'm not partial to eBay so ordered a hopefully suitable substitute from digikey last night; should be here by end of day... we will see if that's the fix...
Thanks guys!

[Mac 108]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

What's the part number for that cap?

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Like I said its a substitute, here is the data sheet:
Maybe one of the more knowledgable guys can review this...
Part# is B32612A7223J008 it's rated high pulse and application include SMPS, I've got 10 coming and will post results but caution you to use at your own risk.

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

I haven't even taken c802 off of my board yet to test it...

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Ok the new caps arrived; took out c802 and tested it-nfg
Checked the new cap- on spec@ .0215uF

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Ok new cap in and board remounted in chassis...
Left all cables but AC disconnected.
Powered up psu-ONE RELAY CLICK!
Checked voltages at main cap- ~390vdc
Jumped M-on to STBY, all voltages including VSTP & VATP check out.
Power down, reconnect Y&Z sus cable and main board cable.
Plugged it back in and it Works!

[tom66]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Nice fix, thanks for sharing!

[Fwrothy]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Thank you brentsky for this solution!
Still not sure of the compatibility of the substitute cap- but so far so good-Comments?

[skyver]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

i cant post a new topic as im a new member but

I have a 60PA6500

It switches between either

*constant relay click

or

*stuck in some standby mode where the screen is on but blank , power LEF is red and control board D101 Led blinks fast then slow then pauses

weird thing is every now and again the TV works fine for a few days then back to this.

when its in its constant relay click boot it will do this with just the power and main board connected and all other boards unplugged

any help an ideas?

POWER SUPPLY EAX64276701/11 EAY62609801

[skyver]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

i have completed an auto gen test and the screen cycles through different colours, so from what ive read that means its a mainboard problem?

what can i test on the main board?

[skyver]

Re: LG 50PA4500 Clicking troubleshooting HELP please...

Mainboard is an EAX64696607 (1.0)