LG 42LW4500-LB Need help with repair of PSU

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

BTW, I cannot read the PCBA P/N as printed on the barcode sticker to look for more info about the board.

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

Are these P/N printed on your board?
Is this the EXACT matched of your board?
LG EAY62169801 (EAX62865401/8)

Pictures provided by shopjimmy.

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

Are these P/N printed on your board?
Is this the EXACT matched of your board?
LG EAY62169801 (EAX62865401/8)

Pictures provided by shopjimmy.

Yes

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

Are these P/N printed on your board?
Is this the EXACT matched of your board?
LG EAY62169801 (EAX62865401/8)

Pictures provided by shopjimmy.

Yes

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

The black thing right to geay capacitor on main is what because it got damaged and no fuse after this part

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

OK, so far you do have standby Voltage otherwise based on Post #1 "Hi guys today my TV stops working (it woudnt turn on only led shine so the power goes into it)"
Looking the board layout, you will not have any DCV between the two legs on any of the filter caps C612~C614 until you have > 2VDC at the 'PWR-ON' pin of the connector P201 to turn on the power relay RL101 to supply the 230VAC to the bridge rectifier BD101.
So check and see if you have DCV at 'PWR-ON' pin or not when the power switch is activated.

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

The black thing right to geay capacitor on main is what because it got damaged and no fuse after this part

That is MOV VA101 and it does not look like it is damaged, if it has been activated it would have blown the main AC fuse.

NTC TH501 is for the inrush current limiter for the STANDBY power supply section.
NTC TH101 is for the inrush current limiter for the MAIN power supply section.

[syaoran123]

Re: LG 42LW4500-LB Need help with repair of PSU

How do you know the power supply is faulty? I would test the fuses first to see if theyre ok.

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

How do you know the power supply is faulty? I would test the fuses first to see if theyre ok.

Its faulty .. I checked all fuses and they are OK .. all of them

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

That is MOV VA101 and it does not look like it is damaged, if it has been activated it would have blown the main AC fuse.

NTC TH501 is for the inrush current limiter for the STANDBY power supply section.
NTC TH101 is for the inrush current limiter for the MAIN power supply section.

All fuses are Okey main AC fuse is before this little b*tch I want to know what is it and what i can replace it iam agry of it as I sed I had no voltage after the part I will mark it on anotherpost I cant get no voltage on the relay so relay cant switch the voltage to diodes when you press power button it will imidietly turn off TV so i cant turn it on i think the marked part is definetly bad please tell me what it is and what can i replace with it :/

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

the red marked one

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

I do not understand which part is bad TH501, TH101?

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

the red marked one

That is MOV and it is NOT BAD, if it is activated the main fuse would have blown, it is for surge protection and it is not needed for the TV to function.
You should be able to read 230VAC between the two legs of that MOV because it is basically connected in parallel with that grey line filter cap which are connected between Line and Neutral.
You are looking at the wrong section.
There is NOTHING WRONG with that MOV!
http://www.mouser.com/ProductDetail/...IfAz8bpg%3D%3D

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

Read post 26 again and report the reading.

[syaoran123]

Re: LG 42LW4500-LB Need help with repair of PSU

Its faulty .. I checked all fuses and they are OK .. all of them

I am not convinced unless you support your claim. Do you even know how to test a fuse? Have you tried heating the mainboard with a hair-dryer?

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

All fuses are Okey main AC fuse is before this little b*tch I want to know what is it and what i can replace it iam agry of it as I sed I had no voltage after the part I will mark it on anotherpost I cant get no voltage on the relay so relay cant switch the voltage to diodes when you press power button it will imidietly turn off TV so i cant turn it on i think the marked part is definetly bad please tell me what it is and what can i replace with it :/

The main board has to send the PWR-ON to turn on the relay, no command signal = no relay action.
You have to follow the instruction.

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

I am not convinced unless you support your claim. Do you even know how to test a fuse? Have you tried heating the mainboard with a hair-dryer?

I know how test fuse .. if beeps its good ... i tryed it and all of them are Ok heating ? man this is not bad chip

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

The main board has to send the PWR-ON to turn on the relay, no command signal = no relay action.
You have to follow the instruction.

I really dont understand you opinions because why I dont have no power on main power circuit ? I think the relay turns on when I press power button but i dont have any power on my primary circuit market like 1 on board. also no power after this red market part so firt gray cap is with power but the second one is without because it looks like the part got damaged like when you damaged fuse . its surge protection i know but when surge protection fails like fuse and got damaged you will have no power after it ? Isnt that true ? and yes I will follow the instructions .

[UndeadLuke]

Re: LG 42LW4500-LB Need help with repair of PSU

OK, so far you do have standby Voltage otherwise based on Post #1 "Hi guys today my TV stops working (it woudnt turn on only led shine so the power goes into it)"
Looking the board layout, you will not have any DCV between the two legs on any of the filter caps C612~C614 until you have > 2VDC at the 'PWR-ON' pin of the connector P201 to turn on the power relay RL101 to supply the 230VAC to the bridge rectifier BD101.
So check and see if you have DCV at 'PWR-ON' pin or not when the power switch is activated.

Where I can found the power switch ? It will be good if you have some scheme for this board .

[budm]

Re: LG 42LW4500-LB Need help with repair of PSU

I really dont understand you opinions because why I dont have no power on main power circuit ? I think the relay turns on when I press power button but i dont have any power on my primary circuit market like 1 on board. also no power after this red market part so firt gray cap is with power but the second one is without because it looks like the part got damaged like when you damaged fuse . its surge protection i know but when surge protection fails like fuse and got damaged you will have no power after it ? Isnt that true ? and yes I will follow the instructions .

The MOV is connected across the power line after the fuse, it will heavily conduct and causes the main AC fuse to blow, like I said it is not need to for the TV to function! You can even remove it! you just will not have surge protection. It is not connected in SERIES like a fuse, it is connected in parallel with incoming AC.
Look up and learn what the MOV is for and how it is used then you will understand.

You think the relay is turned on, how did you figure that out? it has DCV on the relay coil when the power switch is activated and the Voltage is there and did not drop out.
Did you even verify that you do have DCV at the PWR-ON pin as I asked.
It sounds like you are skipping in learning the basic as to how the component functions.