Ok, I have this Dynex LCD that is now will not turn on. When power is applied, red light comes on, relay clicks and then after about 2 seconds clicks again. it then continues to do this until power is removed. This used to happen once in a while and would fix itself if left unplugged for a while, now it's continuous.
I am attaching pics of the front and back of the power board, here are the voltages on the pins on the big ribbon cable connected to the main board (voltages that show a range show how the voltage varies when the relays click on and off):
main board
unplugged plugged in
GND 0 0
GND 0 0
STB 0 4.1V - .054V
5V_S 16-19V 5V - OL
5V_S 16-19V 5V - OL
12V .003V 11.7V - 0V
12V .003V 11.7V - 0V
GND .005V 0V
BR1 .005V .43V
SW 0V .045V
GND 0V 0V
GND 0V 0V
5V_M .063V 5.2V
5V_M .063V 5.2V
Large cap is reading steady 222.7V.
I don't see any obviously bulging caps anywhere, can anyone give me a hint as to where to start with this?
I am attaching pics of the front and back of the power board, here are the voltages on the pins on the big ribbon cable connected to the main board (voltages that show a range show how the voltage varies when the relays click on and off):
main board
unplugged plugged in
GND 0 0
GND 0 0
STB 0 4.1V - .054V
5V_S 16-19V 5V - OL
5V_S 16-19V 5V - OL
12V .003V 11.7V - 0V
12V .003V 11.7V - 0V
GND .005V 0V
BR1 .005V .43V
SW 0V .045V
GND 0V 0V
GND 0V 0V
5V_M .063V 5.2V
5V_M .063V 5.2V
Large cap is reading steady 222.7V.
I don't see any obviously bulging caps anywhere, can anyone give me a hint as to where to start with this?
Attached Files