hi, new member her and apologize if this has been discussed.. tried to search and most of the result are for LC-xxLe6xx series and not sure if it's applicable to the 745U.
the TV stopped turning on and after the V logo stayed solid for a minute or 2, it gives the 3 slow and 1 fast blinks which from what I researched are internal communication error.
did some voltage measurement on the power supply out.
Pin 1 and 2 = 0V --> PNL 12V
Pin 3 and 4 = 0 V --> GND
Pin 5 to 8 = 13V --> UR 13V
Pin 9 to 12 = 0 V --> GND
PIN 13 = 3.24 V --> AC_DET
Pin 14 = 3.01V --> PS_ON
Pin 15 = 5.04V --> BU5V
Pin 16 = 0V --> PNL_POW
Pin 17 to 21 = 0V
Pin 22 = 3.24 = ERROR
Pin 23 = 0V
Pin 24 = 0V
from what I read on the other thread on this forum, the power supply will not turn on the PNL12V if there's no power on PNL_POW pin (correct?)
I measured the voltages on the big caps and they are 164V then jumps to 300++V.
Also the power supply clicks when plugged in.
thinking it's the main board as there's no PNL_POW, ordered it last week and just arrived today. plugged the replacement main board and no changes on the symptoms, plugged in and after few minutes, it does the 3-1 Blink.
both main board does not blink either (The LED on the main board).
What other test can I do to isolate if it's power supply or if the main board that arrived is bad. I understand that the TV is few years old and we will not be able to order new boards.
or is it time to say goodbye to it?
Attached are some pics of the the power supply
please and thank you in advance.
the TV stopped turning on and after the V logo stayed solid for a minute or 2, it gives the 3 slow and 1 fast blinks which from what I researched are internal communication error.
did some voltage measurement on the power supply out.
Pin 1 and 2 = 0V --> PNL 12V
Pin 3 and 4 = 0 V --> GND
Pin 5 to 8 = 13V --> UR 13V
Pin 9 to 12 = 0 V --> GND
PIN 13 = 3.24 V --> AC_DET
Pin 14 = 3.01V --> PS_ON
Pin 15 = 5.04V --> BU5V
Pin 16 = 0V --> PNL_POW
Pin 17 to 21 = 0V
Pin 22 = 3.24 = ERROR
Pin 23 = 0V
Pin 24 = 0V
from what I read on the other thread on this forum, the power supply will not turn on the PNL12V if there's no power on PNL_POW pin (correct?)
I measured the voltages on the big caps and they are 164V then jumps to 300++V.
Also the power supply clicks when plugged in.
thinking it's the main board as there's no PNL_POW, ordered it last week and just arrived today. plugged the replacement main board and no changes on the symptoms, plugged in and after few minutes, it does the 3-1 Blink.
both main board does not blink either (The LED on the main board).
What other test can I do to isolate if it's power supply or if the main board that arrived is bad. I understand that the TV is few years old and we will not be able to order new boards.
or is it time to say goodbye to it?
Attached are some pics of the the power supply
please and thank you in advance.
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