LG 47LS4500 won't power on


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LG 47LS4500 won't power on

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jac36
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Jan 16, 2017, 10:16 PM

Post #1 of 17 (4134 views)
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LG 47LS4500 won't power on	Can't Post

Hello ive got an LG 47LS4500 and it won't power on anymore.

There is no lights on the front pannel when plug in

I don't know anything about reparaing a tv

I open up the tv and i saw there was a power supply boad and the main board witch have all the input connection on it

Any advice what i should do.

Thanks for your recommandation

jts1957
Veteran

Jan 16, 2017, 10:33 PM

Post #2 of 17 (4130 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

Main board is most likely.

Check stand-by Voltage.
P403 9~12pin : +3.5V_ST

If no ... power board is likely.

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Location: Far, Far Away

(This post was edited by jts1957 on Jan 16, 2017, 10:36 PM)

jac36
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Jan 16, 2017, 10:34 PM

Post #3 of 17 (4128 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

do you know wehre i can buy one ?

Im from canada all website ive seen one for now they are out of stock

jts1957
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Jan 16, 2017, 10:41 PM

Post #4 of 17 (4124 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

https://www.shopjimmy.com/lg/47ls4500-ud/

Match with SVC code.

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Location: Far, Far Away

(This post was edited by jts1957 on Jan 16, 2017, 10:43 PM)

jac36
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Jan 16, 2017, 10:47 PM

Post #5 of 17 (4120 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

Yes ive check this site but they are out of stock

http://www.shopjimmy.com/lg-eay62512701-power-supply-led-board.htm

Also another question ive got on this board ive noticed there is a small light on the top right , so my question is normally when the tv is plug and is in standby mode does this light is on ?

Because mine is not light on

Thanks

jts1957
Veteran

Jan 16, 2017, 10:49 PM

Post #6 of 17 (4118 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

Quote

Check stand-by Voltage.
P403 9~12pin : +3.5V_ST

Was your Standby voltage present?

-------------------------
Location: Far, Far Away

jac36
New User

Jan 16, 2017, 10:56 PM

Post #7 of 17 (4115 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

Where is P403? :)

jts1957
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Jan 16, 2017, 11:04 PM

Post #8 of 17 (4113 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

P201 on board ... P403 in SM.

'J96' should be labeled 3.5V

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Location: Far, Far Away

jac36
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Jan 17, 2017, 1:35 AM

Post #9 of 17 (4107 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

Do i need to plug the power when checking this ?

Also how you test J96

Sorry im not really good with that :)

Thanks

jts1957
Veteran

Jan 17, 2017, 2:45 AM

Post #10 of 17 (4104 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

http://www.wikihow.com/Use-a-Multimeter

Read the article;
Obtain an inexpensive meter (Big Box department store for example);
Remove TV back;
Locate test point;
Set meter to DCV ... Red lead on 'J96' ... Black on chassis frame;
Plug in TV. Take measurement.

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Location: Far, Far Away

(This post was edited by jts1957 on Jan 17, 2017, 2:53 AM)

jac36
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Jan 17, 2017, 2:43 PM

Post #11 of 17 (4079 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

ok so Ive Check stand-by Voltage. on P201 9~12pin and i get 0 V

On J96 i get 3.5 V

So what does it mean :) What should i do

Thanks !

jts1957
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Jan 17, 2017, 7:17 PM

Post #12 of 17 (4074 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

J96 and P201 9~12 are the same point.

J97?
Goes from a low (high) voltage to a higher (lower) voltage (and stays) when the Power Button is pressed? Then goes back to its original state when the Power Button is pressed a second time?

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Location: Far, Far Away

jac36
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Jan 17, 2017, 8:12 PM

Post #13 of 17 (4069 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

Just the be clear presently i just got the power supply board with the power cord connect to it. The rest of the tv is at home

On the power board when my power cord is connect, the only voltage i get is 3.5V from connector P201. i don't get any other voltage

When you say
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST

Ive put my red connector from my meter on pin 12 and black on pin 9

Is it correct ?

I can't test the J97 with the power since the rest of the tv is at home

Thanks alot !

jts1957
Veteran

Jan 17, 2017, 8:51 PM

Post #14 of 17 (4067 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

All troubleshooting begins with the TV with the back off, everything else mounted/connected as it was when it left the factory.

Quote

Black on chassis frame

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Location: Far, Far Away

jac36
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Jan 17, 2017, 10:19 PM

Post #15 of 17 (4062 views)
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Re: [jts1957] LG 47LS4500 won't power on [In reply to]	Can't Post

ok i will reconnect all tonight

Thanks !

jac36
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Jan 18, 2017, 2:04 AM

Post #16 of 17 (4060 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

Ok so everything is back in tv

Ive plug in my power cord and took measure

Red on J96 and Black on chassis frame = 3.53 V
Red on J97 and Black on chassis frame = 05.1 V

Stand-by Voltage.
Red on pin 12 and black on pin 9 = 05.6 V

Back to J97 it did not change when pressing power button in front or with the remote control

Thanks !

jts1957
Veteran

Jan 18, 2017, 3:06 AM

Post #17 of 17 (4057 views)
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Re: [jac36] LG 47LS4500 won't power on [In reply to]	Can't Post

And finally, do the 12V and 24V come on when the Power Button is toggled?

Also D607 has failed on these boards.

-------------------------
Location: Far, Far Away

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