panasonic th42pv7m-7blinks

[willyam1]

hi to all.
this tv come on for sec and then shut with 7 blinks in a dark room can see agrey screen for sec without osd and shut -7 blinks
SD ans SU is plug out but the same problem but when plug out the flat cabel in sc20 tv come on whith green led and no screen but not shut
plug back the cabel in to the sc20 and shut again i understand that ther is no problem inSU and SD boards
all put back all valltage ok befor shut
in SC board 5v 15v vad=-105v vscn=40v vset=330v also with scop can see pulses in pin 4,5,6 in plug sc20
shecking the board no short in the fets after all this im not sure if SC board is the the problem or the D OR POWER SUPPLY
ALSO VSUS=190V VE IN SSBOARD IS 165V any idia befor i order a SC board
SC BOARD IS TNPA4182
THANKS WILLYAM

[willyam1]

Re: panasonic th42pv7m-7blinks

anybody?

[tom66]

Re: panasonic th42pv7m-7blinks

This can in rare cases be caused by a damaged or mis-seated ribbon cable from the control board.

[willyam1]

Re: panasonic th42pv7m-7blinks

thanks tomm i will check the ribbon cabel
customer said that the tv was working and he put it on a bench for 2 years and after that he wanted to operet it and it fails the tv didnt work for 2 years?
acording to other panasoinic plasma in most casese the problem in sc board with fet shorted i over over check no problems in all component
i notice the the pin 4 in the ic compertor ic 871 in the circet board 2903 is not ground no to the chasis ground and not to the flouting ground but is conected to the (-) off the VAD smothing capicator do you think that i have an open in thr ground path? i didnt found a servis manual for this sc board
thanks willyam