Hello my Samsung UN55MU6290FXZA recently is showing no function and I've gone through what makes sense to me, but I'm in need of a recommended next step.
TV symptoms are No picture and no standby light. When the CNM8003 is disconnected to the main board the back-light does illuminate.
Testing the CNM803 connection with the main board connected provides the following.
Pin / Signal / Voltage Reading
1 / Fail Count / 0.0V
2 / ANA DIM / 0.0V
3 / A13V / 9.09V
4 / OD On-OFF / 0.0V
5 / A13V / 9.09V
6 / PWM BLU / 0.0V (can't read PWM signal with my tools)
7 / A13V / 9.09V
8 / Power ON / 0.0V
9 / A13V / 9.09V
10 / GND / 0.0V
11 / GND / 0.0V
12 / GND / 0.0V
Testing the CNM803 connection with the main board disconnected connected provides the following.
Pin / Signal / Voltage Reading
1 / Fail Count / 0.0V
2 / ANA DIM / 2.73V
3 / A13V / 12.9V
4 / OD On-OFF / 3.67V
5 / A13V / 12.9V
6 / PWM BLU / 3.07V (can't read PWM signal with my tools)
7 / A13V / 12.9V
8 / Power ON / 4.0 V
9 / A13V / 12.9V
10 / GND / 0.0V
11 / GND / 0.0V
12 / GND / 0.0V
From this information I assumed there was some issue with the power supply board (could not provide the needed current to the main board) or there was some issue on the load from the main board, so I ordered replacements for both. Main Board. Power Supply
The main board arrived first, replaced and I have the same symptoms. Replaced the power supply board also, same symptoms. I've tried the other combinations of components and every time I get the same result with minor variations of voltages. I have trouble believing a purchased component would come in with exactly the same issue. I'm more concerned that the power supply had some unexpected behavior and burnt the replacement main board.
I'm quite confused and what could be my issues. For giggles I tested the voltage at the main-board where the power button and IR receiver come in. At appears that the main board is receiving the communication from both the physical switch and the remote to power on.
Pin / Voltage in Nominal / Voltage When power Button Is Applied to remote or TV
1 / 3.3V / 2.7V (Remote)
2 / 0V /0V
3 / 3.39V / 3.39V
4 / 0V / 0V
5 / 0V / 0V
6 / 1.87V / 0.0 (TV, Physical power button)
7 / 1.87V / 1.87V
8 / 0.0V
9 / NC
10 / NC
11 / 0V
12 / 0V
I would very much appreciate any recommended investigations or insulting comments toward obvious mistakes that will end the complaining from my SO.
-Andrew-
TV symptoms are No picture and no standby light. When the CNM8003 is disconnected to the main board the back-light does illuminate.
Testing the CNM803 connection with the main board connected provides the following.
Pin / Signal / Voltage Reading
1 / Fail Count / 0.0V
2 / ANA DIM / 0.0V
3 / A13V / 9.09V
4 / OD On-OFF / 0.0V
5 / A13V / 9.09V
6 / PWM BLU / 0.0V (can't read PWM signal with my tools)
7 / A13V / 9.09V
8 / Power ON / 0.0V
9 / A13V / 9.09V
10 / GND / 0.0V
11 / GND / 0.0V
12 / GND / 0.0V
Testing the CNM803 connection with the main board disconnected connected provides the following.
Pin / Signal / Voltage Reading
1 / Fail Count / 0.0V
2 / ANA DIM / 2.73V
3 / A13V / 12.9V
4 / OD On-OFF / 3.67V
5 / A13V / 12.9V
6 / PWM BLU / 3.07V (can't read PWM signal with my tools)
7 / A13V / 12.9V
8 / Power ON / 4.0 V
9 / A13V / 12.9V
10 / GND / 0.0V
11 / GND / 0.0V
12 / GND / 0.0V
From this information I assumed there was some issue with the power supply board (could not provide the needed current to the main board) or there was some issue on the load from the main board, so I ordered replacements for both. Main Board. Power Supply
The main board arrived first, replaced and I have the same symptoms. Replaced the power supply board also, same symptoms. I've tried the other combinations of components and every time I get the same result with minor variations of voltages. I have trouble believing a purchased component would come in with exactly the same issue. I'm more concerned that the power supply had some unexpected behavior and burnt the replacement main board.
I'm quite confused and what could be my issues. For giggles I tested the voltage at the main-board where the power button and IR receiver come in. At appears that the main board is receiving the communication from both the physical switch and the remote to power on.
Pin / Voltage in Nominal / Voltage When power Button Is Applied to remote or TV
1 / 3.3V / 2.7V (Remote)
2 / 0V /0V
3 / 3.39V / 3.39V
4 / 0V / 0V
5 / 0V / 0V
6 / 1.87V / 0.0 (TV, Physical power button)
7 / 1.87V / 1.87V
8 / 0.0V
9 / NC
10 / NC
11 / 0V
12 / 0V
I would very much appreciate any recommended investigations or insulting comments toward obvious mistakes that will end the complaining from my SO.
-Andrew-
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