Re: LG 42LW4500-LB Need help with repair of PSU
I just remove the surge protection and TV starts LCD shine i also hear click of rele so maybe i will try to do this with this surge protection again .. and chill man I know Iam dumbass maybe but i made progress and it starts shine before it do nothing just turn off imidietly...
UndeadLuke
Member
Last Activity: 11-29-2016, 11:02 AM
Joined: 11-19-2016
Location: Prague
-
Re: LG 42LW4500-LB Need help with repair of PSU
I need service manual for board scheme :/...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
So you telling me i need to coonect the man
Inboard and everything else and try to pit on 230vac try to set on tv and after thst i need to look for bad part ? I will try to remove the surge protection and i will check the board under voltage again if the voltage will go after because now i have voltage only on main gray filter cap i will replace the surge protection with cable for test...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Where I can found the power switch ? It will be good if you have some scheme for this board ....Leave a comment:
-
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...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
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...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
the red marked one...Leave a comment:
-
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 :/...
Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Its faulty .. I checked all fuses and they are OK .. all of them...Leave a comment:
-
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
Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Yes...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Yes...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Yes 250VAC on gray cap on right side of it its some type of varistor or part (i dont know what it is and which one i need to replace) this part has voltage on + but if you try + and - no voltage everything after that it has no or bad voltage in miliamperes...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Okey guys So I make big progresws today I check the big capacitors and no voltage on them the voltage stops on part INR or LNR next to main gray CAP so this part is definitly damaged does anyone know which one i need to replace ? it looks like Varistor but i dont know nothing about it
Leave a comment:
-
Hello can you please help me with this post ?
[URL="https://www.badcaps.net/forum/showthread.php?t=58422"]https://www.badcaps.net/forum/showthread.php?t=58422[/URL]
Okey so I made little progress with new multimeter from my teacher i check all diodes including zeners all of them are OK I also check the 3 big electrolyte capacitors and they are good also checked main gray capacitor and its okey any ideas what i need to check it ? I still believe its bad PSU boardHello can you please help me with this post ?
[URL="https://www.badcaps.net/forum/showthread.php?t=58422"]https://www.badcaps.net/forum/showthread.php?t=58422[/URL] -
Re: LG 42LW4500-LB Need help with repair of PSU
I will wait 2 days and try to find the problem with my teacher of electrotechnicsLeave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Ah okey thanks I wil try check it with my teacher but also i found something this board has 2 circuit primary and secondary and i cant measure ohms on resistors on second circuit thats weird on first sector of board theres no problem with measure ohms on resistor...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Okey but I dont understand why they put higher voltage capacitors than it came to board they are dimensed to 470v nothing in my country has 450v maximal range from plug is 380v i will wait 2 days until my school starts and i will ask my teacher for help to find the problem i returned the thermistors do you think it helps when i bought new capacitors and replace them ?...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
Yes I can but before I will return the thermistors also must i plug the 230v in it ? i had the down model of board so i will check it but i think the leds work because my tv turn on for second and then turn of like she found short circuit...Leave a comment:
-
Re: LG 42LW4500-LB Need help with repair of PSU
I cant check the voltage of the 3 long capacitors with power on because my multimeter support only 230volts but the capacitors had 450v...Leave a comment:
No activity results to display
Leave a comment: