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Crumbtrail TV Forums: TV Equipment: Plasma TV Forum:
i got a new LG 50" plasma for free but...

 

 


cody_748
New User

May 29, 2006, 1:29 AM

Post #1 of 9 (3123 views)
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i got a new LG 50" plasma for free but... Can't Post

My best friends house was struck by lightning and her dishwasher,surround sound,hottub and 50" plasma were all hit indirectly. She has filed an insurance claim and has replaced the plasma. She was gonna toss the old plasma in the trash and i told her i would take it. It's exactly 1 month old ... LG 50" model #50PX4DR. I have plugged it in and hooked my cable to it but i get nothing. No fans, lights, nada.
My question is...am i wasting my time or could it be something like a fuse or power supply? I have some electronics experiance (i own an A/C company) and can change boards or power but anything more than that and its out of my field.
Any help would be appreciated.



techchris
Veteran

May 29, 2006, 2:11 PM

Post #2 of 9 (3114 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post

check the mains fuse in the set.it may be just that but i doubt it.it has probably blown the power supply module but unfortunately when this happens the surge often takes out other components.LG=lucky goldstar(made by goldstar-lucky if it works for long)


cody_748
New User

May 29, 2006, 7:23 PM

Post #3 of 9 (3107 views)
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Re: [techchris] i got a new LG 50" plasma for free but... [In reply to] Can't Post

I have the back panel off...and it has 3 fuses that i can see. I ran a continuity test and they are all ok. I started by tracing where the power goes in (into a noise filter) then out to a main board. I have unplugged the red/blue power wire from the board, applied power and i am reading only 37vac. I unplugged power, ran continuity threw the red/blue power wire (red - recepticle = continuity, blue - recepticle = open) to the recepticle. I am assuming that since the board reads 100vac - 240vac input that i am not getting voltage to the board.
Can i bypass the noise filter incase a wire internally is open ?(for testing only)


cody_748
New User

May 29, 2006, 10:07 PM

Post #4 of 9 (3099 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post

Just wanted to thank you for the help. I was able to fix it. There was either an open wire in the noise filter or the noise filter was bad. I by-passed the filter and ran power straight into the red/blue wire which feeds L1 & common into the board.
I will order a new noise filter and reinstall it.
Thanks again


denonjapan
Veteran

May 30, 2006, 3:09 AM

Post #5 of 9 (3097 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post

Cody! don't mess with nature!. I felt your pain a 50 inch display would have been in trash, you can keep it! but no electrician can revive this case. lightning doesn't strike same place twice, they say! but when it does, till death trying? you never succeed!. move on!
Remind your friend by the way: to now use strip socket with lightning protector. if it does strike another area,god forbid!, (it may not be same place but it could be anywhere). The strip socket goes first. and your gadgets are safe.....

denonjapan
made in japan


cody_748
New User

May 30, 2006, 3:15 AM

Post #6 of 9 (3094 views)
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Re: [denonjapan] i got a new LG 50" plasma for free but... [In reply to] Can't Post

I did mess with nature...and i did win !! Wink
Im sitting here watching it as i type this. The only problem i can see is i have to plug my cable into the "antenna" port insted of the cable port on the back. Other than that, perfect picture.


cody_748
New User

Jul 3, 2006, 12:31 PM

Post #7 of 9 (2996 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post

I am now looking for the part that is bad on my plasma. It is called a noise filter and is located on the back of the tv. The main black power cord plugs into this and it actually has a recepticle on one end and 2 wires coming out the other. I have called the tech support @ LG but they couldn't even find it on their scematics.
Thanks for the help
Cody
Attachments: noise filter.jpg (43.8 KB)


techchris
Veteran

Jul 4, 2006, 9:59 AM

Post #8 of 9 (2987 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post

LG can be terrible for spare parts supply as often their service manuals bear no resemblance to reality. If you need the mains filter choke try a local service agent who can rob one from a scrap tv for you. you may have to modify the connections but its not dificult.


Horsewhisperer
New User

Aug 6, 2006, 12:41 AM

Post #9 of 9 (2878 views)
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Re: [cody_748] i got a new LG 50" plasma for free but... [In reply to] Can't Post


In Reply To
I did mess with nature...and i did win !! Wink
Im sitting here watching it as i type this. The only problem i can see is i have to plug my cable into the "antenna" port insted of the cable port on the back. Other than that, perfect picture.


Well man, you are one extremely lucky dude. Kudos to you. I hope it lasts.
There is a fair chance, however, that your plasma won't have a very extensive career. They a riddled with electronic bits that are very statically sensitive.
To give you an idea of how sensitive - I worked at a firm that makes EFTPOS machines. In these machines were surface mounted IC's, a common feature in most electronic products these days. These little beasts HATE static electricity. A static discharge of a mere 100 Volts will decrease the expected working life of these little beasts by HALF. A discharge of 250volts can fry them instantly.
To put this into perspective. If you touch something metallic and feel a small zap, that's at least 80-100 Volts discharge your feeling. If you can see a little spark jump from your finger, then your looking at a potential 400-1000Volt discharge (Depends on atmospheric conditions at the time). That's enough to fry almost any consumer electronic component.
And if you think it can't happen, I once fried a computer power supply by discharging static onto it. Definately something I didn't expect at the time. Needless to say, I earth myself properly when playing with the internals of my electrical equipment now.
Back to where I worked. They were so concerned with the life expectency of their electronics components, we were only allowed to handle them with a static strap attached to a static mat, that was earthed with a 10 meg ohm resistor. if we touched them any where else, we were required to throw them out!
Good Luck any way Tongue

 
 
 


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