alfredomfr1
Badcaps Veteran
Last Activity: 11-15-2024, 06:57 PM
Joined: 10-29-2014
Location: miami, Florida
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I bought a new Power Supply Board and the TV works correctly. I'm trying to repair the original board and I have the boards side by side connected to the power, every measure until now are the same.... -
With everything hooked up the TV can't be turned on, the front red LED no light up, the power button not respond, the remote control no respond. The voltage on main capacitors is 166v.
I know that this look like a main board problem, but I changed the MB 2 times and everything remain same.
I disconnected the MB to PS cable and the LEDs light up and I connected the cable back again and the TV work perfect until I disconnect the power cable, after that the TV become unresponsive again.Leave a comment:
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Post #38, yes I did the testLeave a comment:
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You right is going to GNDLeave a comment:
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Leave a comment:
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post #25 and #26Leave a comment:
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Yes, I already did itLeave a comment:
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Diah I already did, post #25 and 26#Leave a comment:
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DM851C from left to right :
151.7v, 0v, 158.3v
DM852C from left to right:
158.8v, 302.1v, 150.5v
DM851C is that 0v OK?...Leave a comment:
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That was the first thing I did, this board has become a puzzle for me.Leave a comment:
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No red light on the frontLeave a comment:
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Sorry for the delay I was out of the town.
I disconnected the screen ribbon cables (no the LVDS) first one and then the other and finally both with the same result: STBY pin fluctuating between 3v and 7vLeave a comment:
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Cable of pin 8 out, pin 4 and pin 8 connected, same result that post # 3....Leave a comment:
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pin 10, 11 and 12 are GNDLeave a comment:
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MB and BL disconnected
CNM802
1- 0.9v
2- 3.3v
3, 5, 7, 9- 12.85v
4- 3.3v
6- 3v
8- 4.5v
CH1- 301v
CH2- 0
CH3- 301v
CH4- 0
CH5- 0
CH6- 301v
Main Capacitors- 396v
DM851C
leg 1- 150v
leg 2- 0v
leg 3- 158v
DM852C
leg 1- 158v
leg 2- 302v
leg 3- 150vLeave a comment:
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I will do the #4 advice tomorrow, thanks for all your effort, see you guys tomorrow.Leave a comment:
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No, is a light effect, cap is okLeave a comment:
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I've done this before, with any combination, the same result, the red LED off, TV can't power ON, Stby fluctuating between 3v and 7v, Main Capacitor 164v, same result with 3 main boards...Leave a comment:
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TV Samsung UN75NU6900FXZA
LEDs TV work with the Power to Main Board cable disconnected.
If the cable is connected red light no present, STBY pin oscillating.
I replaced the Main Board 2 times with same result.
Now the weird thing: With the TV connected and the LEDs lighting up , I connect back the cable to the Main Board, the TV turns off but the red LED light up and you can turn ON and OFF the TV working perfectly until you disconnect the power.
When you disconnect the Power the TV return to the previous situation.
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Disconnect the LVDS cable, turn on the TV and check if screen light onLeave a comment:
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