Re: Samsung UN55MU6290 - No Power, No Standby Light
I'm searching again and the only main boards I can find available are >$250. All of my known reputable vendors are out of stock. I assume there are many issues with this main board. For me the cost doesn't make financial sense to keep this TV alive. I'll look for someone local that wants scrap parts.
Thank you all for your support. I appreciate the guidance and sharing of knowledge!
egge88
Member
Last Activity: 05-02-2020, 11:47 AM
Joined: 04-25-2020
Location: Detroit
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Thank you for the insight. I checked the operation with individual ribbon cables. In either condition the unit still continues to boot loop. I also checked with no ribbon cables, same boot loop.Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Replacement main board board 2.0 came in today. Hooked up and now we have a new situation.
Standby LED is illuminated. When the power button is pressed (Remote or button) the TB attempts to boot with a second or two of back light, then backlight goes away and seems to start a boot loop cycle about every 10 seconds or so.
Loop is:
1-2s backlight activated (9V standby changed to 12.9V)
2-10s backlight drops out, (12.9V drops significantly and comes back up to 9.09V
Nothing...Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Sorry, the TV is mine. 3 years without any major incident. Woke up the next morning to a non-functional TV. Today, I've come to learn that a few outlets in my house are not grounded. The entertainment system surge protector plug being one of them. No other products in the house are showing any issues.Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
The IR sensor and the power/joystick can be unplugged individually. Isolating each and trying to power on has the same result as before, no led, no backlight, and no change in 9V from the powersupply.
Pin / Voltage in Nominal / Voltage When power Button Is Applied to remote or TV
1 / 3.3V / 2.7V (IR)
2 / 0V /0V (IR)
3 / 3.39V / 3.39V (IR)
4 / 0V / 0V
5 / 0V / 0V
6 / 1.87V / 0.0 (TV, Physical power button)
7 / 1.87V / 1.87V(TV, Physical power button)
8 / 0.0V...Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Yes, that CN1601 connects to the IR receiver and a combination power and navigation button array. See attached picture for a close up.
So far I've completed the testing on both sets (original and replacement) but fair point to isolate. I can't find a good detail of the circuits on the main board to understand what I'm testing and what the test would be on.
I've attached two more images showing this area of the board surrounding the CN1403 and CN1601....Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Yep, T-Con disconnected as well as pictured here....Leave a comment:
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Re: Samsung UN55MU6290 - No Power, No Standby Light
Thank you for the feedback. I unplugged the wifi module and the Voltages are the same. I did the same with everything unplugged from the main board. Same result as well
Testing the CNM803 connection [B]with the main board connected and WIFI module unplugged[/B] 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...Leave a comment:
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Samsung UN55MU6290 - No Power, No Standby Light
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 [B]with the main board connected[/B] provides the following.
[U]Pin / Signal / Voltage Reading[/U]
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... -
Re: New Members - please post your introductions here
Hello from Detroit. Looking for some information on methods for repairing electronics.Leave a comment:
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