Re: Samsung LED TV troubleshooting. Help is very appreciated!
Thank you, but i have measured and the pins are not shorted.
Akoen
Member
Last Activity: 11-30-2015, 03:57 PM
Joined: 06-01-2015
Location: Aarhus
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
I still haven't solved the problem. Does anyone know a solution?Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Yes it is switching with 2 second intervals. And the "backlight on" is staying low....Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Is it at all possible to fix the main board?Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
The PS pin is btw also called SW_PWR_OUT. So the main board is changing the State of this pin every 2 second.Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
It appears to be the PS pin that causes the power cycling. If i remove the PS pin from the connector the TV doesn't power cycle. But i Can still only turn the backlight on and OFF. Other functions isn't working. Any ideas?Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
I have tried to connect pin 12 (BLU) to 5 volts. This does turn on the backlight, but the television is still power cycling (meaning that the screen turns on and off and i can hear a relay clicking, in intervals of 2 seconds)....Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Forget this! My bad......Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
As far as i can tell BLU is connected to 13V through a resistor on the main board.Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Thank you for your time!
Okay how? By shorting some pins? Can this cause the power cycling?
Does the other pins look correct?...Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
In my previous post, the last reading are made by disconnecting the mainboard from the power board. In this scenario the backlight is turned on and the reading are higher than when the boards are connected.Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Thank you. Here are my readings (measured on connector at the mainboard end). The power supply is switching between two states. The results in parentese illustrates the "off" state. Here pin 20 still has some voltage:
Pin 1 (OD_LE) = 2.33V (0V)
Pin 2 (PWM 4) = 0.69 (0V)
Pin 3 (OD_ON) = 2.32V
Pin 4 (PWM 3) = 0.69V (0V)
Pin 5 (GND) = 0V
Pin 6 (PWM 2) = 0.69V (0V)
Pin 7 (B13V) = 12.74V (0V)
Pin 8 (PWM 1) = 0.69V (0V)
Pin 9 (B13V) = 12.74V (0V)...Last edited by Akoen; 11-21-2015, 02:12 PM.Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
How Can i be sure that it is the main board that is faulty?Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Never mind last picture. Meter was running low and showing odds voltages. I measure 5.3V on the 5V pin and 12.75V on the 13V pinLeave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Here i measure the voltage...Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
On the 5V pins i Can measure 6V in High State. I Can also measure a constant 6 V on the 5v condensator. Se picture. What Can cause this?...Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
I have attached the cables to two free pads on the same traces as the burnt out pins. There is no short so the failure is another place. Besides i Can measure a voltage switching between 0 and 5 volts on the mainboard at the right pins....Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
And this...Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Yes of course!...Leave a comment:
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Re: Samsung LED TV troubleshooting. Help is very appreciated!
Thank you! I have just tried to solder a cable directly from the pads but without luck. The TV is just clicking and the voltage is switching between 0 and 5 volts
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