I have this LCD TV and am told it was working fine, but just went dead. Plug it in and I hear a click, but no lights other than the optical audio out.
Attached are three pictures, one a wide picture of the back, the second of the power board and the third of the main board. I couldn't quickly figure out how to remove the shielding for the main board and will need to investigate further if necessary; however, i am trying to figure out if I need to go there.
To start with let me set the understanding that my knowledge is very high level and my terminology may be rather inexact. I would be interested in a component level fix if possible, but a board level fix may be sufficient.
I tested the voltages with the power supply plugged in, but CN201 and CN202 unplugged. CN201 has two connectors -- one going to the main board and the other going to the inverter board. CN202 has a PS On, Power Err Det three grounds and three 4 VSB markings. With nothing plugged in the PS On shows 4.17 V and three 4 VSB posts change voltages over the range of about 4.03 to 4.20 (continually changing readings). Nothing on Power Err Det. No voltages detected on CN201.
If I plug all the connectors in two of the 4 VSBs have a connection and both read 4.17V; zero volts on Power Err Det. and PS On shows .08V. CN201 has 24V and ground on the top connector which goes to the inverter and the lower connector (middle one of the three) shows 1.13V on the Pwr 6V connections, .44V on the Pwr Panel connections, .87V on the 15V connections and .01V on the 30V connections.
These readings would lead me to believe the power supply is bad. As previously stated, pushing the power button on the top of the TV does nothing (i.e., TV seems dead), though i do notice that the optical audio light is on. My understanding is that the main board waits to be energized by the power button being pressed and then turns on the set. So i am suspecting that the fact i am getting 4.17V on PS On when nothing is connected means the power supply is good and that the main board is not energizing the TV when the button is pushed. Which I am guessing would then generate the voltages shown with CN201
I am not sure if that is a correct understanding and would appreciate corrections to my thinking if necessary. I also suppose that the power button could be malfunctioning, but I do not suspect this because I am told the TV was working and just turned off and would not turn back on.
I can check other things and get other/better pictures, but first would like to know if the above understanding is correct.
Attached are three pictures, one a wide picture of the back, the second of the power board and the third of the main board. I couldn't quickly figure out how to remove the shielding for the main board and will need to investigate further if necessary; however, i am trying to figure out if I need to go there.
To start with let me set the understanding that my knowledge is very high level and my terminology may be rather inexact. I would be interested in a component level fix if possible, but a board level fix may be sufficient.
I tested the voltages with the power supply plugged in, but CN201 and CN202 unplugged. CN201 has two connectors -- one going to the main board and the other going to the inverter board. CN202 has a PS On, Power Err Det three grounds and three 4 VSB markings. With nothing plugged in the PS On shows 4.17 V and three 4 VSB posts change voltages over the range of about 4.03 to 4.20 (continually changing readings). Nothing on Power Err Det. No voltages detected on CN201.
If I plug all the connectors in two of the 4 VSBs have a connection and both read 4.17V; zero volts on Power Err Det. and PS On shows .08V. CN201 has 24V and ground on the top connector which goes to the inverter and the lower connector (middle one of the three) shows 1.13V on the Pwr 6V connections, .44V on the Pwr Panel connections, .87V on the 15V connections and .01V on the 30V connections.
These readings would lead me to believe the power supply is bad. As previously stated, pushing the power button on the top of the TV does nothing (i.e., TV seems dead), though i do notice that the optical audio light is on. My understanding is that the main board waits to be energized by the power button being pressed and then turns on the set. So i am suspecting that the fact i am getting 4.17V on PS On when nothing is connected means the power supply is good and that the main board is not energizing the TV when the button is pushed. Which I am guessing would then generate the voltages shown with CN201
I am not sure if that is a correct understanding and would appreciate corrections to my thinking if necessary. I also suppose that the power button could be malfunctioning, but I do not suspect this because I am told the TV was working and just turned off and would not turn back on.
I can check other things and get other/better pictures, but first would like to know if the above understanding is correct.
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