Logik LOG32lw782

[joehezzer]

Hi all ok so i picked up a logik lcd screen the other week, no power so checked all the fuses etc nothing so i found a cheap working psu for and bought it, the problem i have is i fitted new second hand new board and it is still not doing anything at all







the problem is i am not sure what to check on this set cheers in advance

[joehezzer]

Re: Logik LOG32lw782

[multimeter]

Re: Logik LOG32lw782

id be checking for dry joints,this psu suffers badly with them big time !

also they suffer with bad caps.

change the output caps with panasonic fc/fm series,it should fix it.

thats all ive had to do on these psu's

i think they are g luxon,caps yuck..

[joehezzer]

Re: Logik LOG32lw782

its supposed to be a working psu, will re solder some of the joints on it

[multimeter]

Re: Logik LOG32lw782

seriously resolder them joints,ive found about 10-20 cold joints on these

[joehezzer]

Re: Logik LOG32lw782

will get on it now will report my progress is it pretty common with this set then

[multimeter]

Re: Logik LOG32lw782

yes ,these are used in a lot of generic tv's,they really are a pile of crap

[joehezzer]

Re: Logik LOG32lw782

Are there any test points on these sets

[multimeter]

Re: Logik LOG32lw782

Are there any test points on these sets

i cant remember exactly ,ive only ever had to replace caps,and redo joints ,every time on this psu,this normally fixes them

[joehezzer]

Re: Logik LOG32lw782

It should be a working psu it was tested before dispatch.

[multimeter]

Re: Logik LOG32lw782

yes it SHOULD be working,many a time i have done this ,and tested psu and it hasnt worked,there is no way of knowing if the tests have been done,the advert is usually...


power supply taken from a broken screen tv...blah blah,you get the picture

[joehezzer]

Re: Logik LOG32lw782

yeah lol

[joehezzer]

Re: Logik LOG32lw782

ok so i have taken the main avi board off to find one of the caps joints looks rough



there does not seem to be a copper to solder the cap to
sorry about the pick thats about as close to it i can get.

[multimeter]

Re: Logik LOG32lw782

ok so i have taken the main avi board off to find one of the caps joints looks rough



there does not seem to be a copper to solder the cap to
sorry about the pick thats about as close to it i can get.

dont forget the psu!

on that capacitor with no pad around it,scratch some of the silkscreen off,you may find some copper underneath to solder too.

or run a jumper wire to the cap pads next to it,to the correct pad - to - or + to +,

[joehezzer]

Re: Logik LOG32lw782

dont forget the psu!

on that capacitor with no pad around it,scratch some of the silkscreen off,you may find some copper underneath to solder too.

or run a jumper wire to the cap pads next to it,to the correct pad - to - or + to +,

will try that

[joehezzer]

Re: Logik LOG32lw782

ok all soldered up looks ok

[multimeter]

Re: Logik LOG32lw782

ok all soldered up looks ok

re-fit ,and power up to see what happens

[joehezzer]

Re: Logik LOG32lw782

nothing although when i put plug into my white extension lead you can see a blue/flash spark at that particular plug, everything is telling me its the psu as there is no power, no standby light nothing

[multimeter]

Re: Logik LOG32lw782

nothing although when i put plug into my white extension lead you can see a blue/flash spark at that particular plug, everything is telling me its the psu as there is no power, no standby light nothing

id be concentrating on the power supply,joints +output caps if that is the case.

[joehezzer]

Re: Logik LOG32lw782

id be concentrating on the power supply,joints +output caps if that is the case.

thats the only thing i can think of.