I just acquired a LG 60PN5700 from a friend who didnt know what was wrong with it. The TV powers up and I see a small flash on screen but then it cycles back off then on. It seems to be on but no video or sound. I traced the 5v and 17v around the boards it seems to be getting around to every board.. I tried to use a heat gun on the main board and rework it, didnt have any effect. What should i focus my attention on?
PB P/N: EAX64880001
MAIN P/N: EAX64870004
### P813 ###
M_ON = .61v
PL_ON = 1.22v
5.2V = 5.2v
G
G
5.2V = 5.2v
5.2V = 5.2v
G
17.V = 17.1v
Auto_G = 4.1v
AC_ON = 5.0v
17V_DET = 2.357v
VS_ON = .64v
G
VS_DET = 2.7v
5.2V = 5.2v
G
17V = 17.1v
### J148 ###
VS = 203v
VS = 203v
-
GND
GND
VA = 55v
5V = 5.2v
PB P/N: EAX64880001
MAIN P/N: EAX64870004
### P813 ###
M_ON = .61v
PL_ON = 1.22v
5.2V = 5.2v
G
G
5.2V = 5.2v
5.2V = 5.2v
G
17.V = 17.1v
Auto_G = 4.1v
AC_ON = 5.0v
17V_DET = 2.357v
VS_ON = .64v
G
VS_DET = 2.7v
5.2V = 5.2v
G
17V = 17.1v
### J148 ###
VS = 203v
VS = 203v
-
GND
GND
VA = 55v
5V = 5.2v
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