urgent help 50pk550-so desperate here
hello everyone.
this is my first post here so i would like to express my deepest gratitude for all of you-absolutely saints!
as mentioned, i am so desperate,mad,sad whatever you choose
could really use your help here...
i own this plasma tv set LG 50pk550 and the problem description is as follows:
as i plug the power cord, red stby lights up perminant.
when trying to fire up(via remote or touch buttons) two fast relay clicks followed by stby light turns off.
after about 8 seconds, another click followed by red stby on again.
through out all mentioned process the screen stayed solid black(verified in complete darkness)
destructive googling lead to:
1.bought the damn "repair kit" which included voltage regulator and couple of high white corner resistors-replaced everything with no change.
2.executed different voltage examination-seems to be ok.
3.executed two light bulbs load test-lights worked and stayd on(psu ok right?)
4.executed sync board( the one with flashing tiny green led) test by jumping two holes as said in the training manual(for 50pk750)-nothing appears on the screen at all and it is still solid black, not even a clue for backlight.
5.i must mention that when power on button pressed (stby light off), the y and Z boards makes a silent "buzz" noise, as if it works ok( i guess ).
6.checked ALL visible fuses within ALL boards-continuity OK.
7.i must also mention that all caps and boards seems to be BRAND NEW as can be seen whitin attached photos.
PLEASE any more ideas,directions,examinations?
have all needed tools(solder iron,multimeter,solder iron pump etc...).
thank you very much in advanced,
rami.
this is my first post here so i would like to express my deepest gratitude for all of you-absolutely saints!
as mentioned, i am so desperate,mad,sad whatever you choose
could really use your help here...
i own this plasma tv set LG 50pk550 and the problem description is as follows:
as i plug the power cord, red stby lights up perminant.
when trying to fire up(via remote or touch buttons) two fast relay clicks followed by stby light turns off.
after about 8 seconds, another click followed by red stby on again.
through out all mentioned process the screen stayed solid black(verified in complete darkness)
destructive googling lead to:
1.bought the damn "repair kit" which included voltage regulator and couple of high white corner resistors-replaced everything with no change.
2.executed different voltage examination-seems to be ok.
3.executed two light bulbs load test-lights worked and stayd on(psu ok right?)
4.executed sync board( the one with flashing tiny green led) test by jumping two holes as said in the training manual(for 50pk750)-nothing appears on the screen at all and it is still solid black, not even a clue for backlight.
5.i must mention that when power on button pressed (stby light off), the y and Z boards makes a silent "buzz" noise, as if it works ok( i guess ).
6.checked ALL visible fuses within ALL boards-continuity OK.
7.i must also mention that all caps and boards seems to be BRAND NEW as can be seen whitin attached photos.
PLEASE any more ideas,directions,examinations?
have all needed tools(solder iron,multimeter,solder iron pump etc...).
thank you very much in advanced,
rami.
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