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Panasonic Viera LCD has no picture but does have sound
Hello,
ANSWERS:
"@mlb32001
check the voltage on the individual boards. If the output is correct you know it is your backlight array. If the voltages are not then you know the problem is on he individual boards. Use your multimeter and test for the voltage on the test points (TP marked on the boards)Multimeter set to the voltage VDC according to the list . Black probe to ground, red probe to TP.
Voltage chart of P-Board
VOLTAGE TEST POINT SPECIFICATION
24V TP7407 < 1V 24V ± 1.2V
16V TP7410 < 1V 15.7V ± 0.6V
5VS TP7501 5.2V ± 0.2V 5.2V ± 0.2V
PFC TP7201/TP7202 < 340V 390V ± 15V
Voltage chart of A-Board
VOLTAGE TEST POINT SPECIFICATION
PANEL12V TP4097 11.3V - 13V
SUB3.3V TP5400 3.16V - 3.48V
SUB5V TP5420 4.98V - 5.25V
SUB1.5V TP8101 1.45V - 1.57V
SUB1.2V TP8100 1.14V - 1.26V
STB5V TP5200 4.9V - 5.4V
STB3.3V TP5002 3.14V - 3.46V
HDMI3.3V TP8000 3.14V - 3.46V
Of course, you can also try to measure the voltages on the connectors.
Always remember that you also need a signal to turn the backlight on (BL_ON). No signal no backlight. Let us know what you find"
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