riparo
Senior Member
Last Activity: 07-20-2024, 10:43 AM
Joined: 01-11-2024
Location: MILAN
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tv samsung ue50nu7400 no power led standby
Hi everyone, I have a problem with a Samsung TV model UE50NU7400, I don't have the stanby LED, on the power supply board after a first check I found the fuse blown, and the 2 KF7N50 transistors on the primary power supply both short circuited, I replaced the fuse and the 2 transistors, now the short circuit has disappeared but I still don't have the LED off, do you have any suggestions?... -
however I break a spear in favor of [USER="13553"]Davi.p[/USER] , if it wasn't for him I would not have had the opportunity to understand the problem, I was lucky to find my own TV friend to try in the definitive way TV, I thank everyone for the collaboration and especially to [USER="13553"]Davi.p[/USER] for the patience I had in relation to me.Davi.p... -
yes, I did this test too, it's the panel of the other TV turned on without problemsLeave a comment:
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i recovered from another TV all the cards, main board, power supply, T-con is I mounted it on my TV, the same flaw, the panel went, thanks Davi.pLeave a comment:
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i thank [USER="13553"]Davi.p[/USER] for the great help he gave me to check the panel, unfortunately the panel is defective I will store the power as spare partsDavi.pi thank [USER="13553"]Davi.p[/USER] for the great help he gave me to check the panel, unfortunately the panel is defective I will store the power as spare partsLeave a comment:
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ok [USER="13553"]Davi.p[/USER], before I perform the test with connected panel, I wanted to remove a doubt, if I insert the 3.3v externally do not go to overcome the necessary voltage? since the test point already comes 1.60, should the voltage to be applied not be lower? i don't know if I've explained myself wellDavi.pLeave a comment:
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hi, as usual we don't understand each other, it's the translator's fault, I tried to bench test the t-con, I put a single 3.3 V power supply on the VCC3.3 point with a protected power supply, but it doesn't go into protection, then I took some refrigerant spray and sprayed it on the condenser area near the vcc3.3 point but no component heats up, I also did the test on the opposite side under the t-with no hot condenser, then I measured all the volts capacitors on the vcc3.3 line and as indicated in the photo there are those values, furthermore from the output of the diode 2179 (d6001) I have 1.60v...Leave a comment:
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Hi [USER="13553"]Davi.p[/USER] I tried to carry out the test but I didn't get any feedback, I also tried with the refrigerant spray to check if the condenser was heating but nothing, I noticed that at the output of the reported diode I have 1.60v which is the line that goes at the vcc 3.3 test point the smd capacitors reported above and below the board all have that value, I wouldn't want the problem to be the diode in question which doesn't work well, what do you think?Davi.pLeave a comment:
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forgive me, I wrote it wrong, as I was telling you, I tested both mosfets in diode mode, the second one has some anomalous values, furthermore under voltage I have 0 volts, while on the first I have 12 volts as shown in the photo in the previous post, I wanted to ask you if It is always linked to the vcc3.3 anomalyLeave a comment:
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I want to try to solve the problem on the t-con, I tested the capacitors under and above the board corresponding to the VCC 3.3 line in ohms, is it normal for the diodes marked by you to be a diode at or volts? Furthermore, can you tell me the precise area to check again what about capacitors?thanks...Leave a comment:
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Hi Davi.p I checked the capacitors you suggested, they all seem ok, however I noticed that measuring one of the 2 diodes in the diode test gives me a different reading from the first and also by measuring it in volts I get 0v...Leave a comment:
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okay, I can try it in ohmLeave a comment:
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that is, here are the measurements in volts on the t-con as you reported on the test points...Leave a comment:
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okay, so they could be the T-con the problem, as soon as I can tell you the values of points marked on t-conLeave a comment:
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OkLeave a comment:
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ok...Leave a comment:
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thanks a lot I'll let you know...Leave a comment:
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Hi, [USER="75051"]Diah[/USER] sorry, could you explain better? Or if you know a procedure that allows us to carry out the test, it would be appreciated.DiahHi, [USER="75051"]Diah[/USER] sorry, could you explain better? Or if you know a procedure that allows us to carry out the test, it would be appreciated....Leave a comment:
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sure the gnd is connected to the ground of the TV chassis, then as I said in the previous post the voltages on the t-con are present both the 24v that comes from the PB board and the 12v that comes from the external power supply, I attach photos t-con and await your suggestions to find a solution [USER="13553"]Davi.p[/USER] e [USER="493496"]tanti[/USER]Davi.p...Leave a comment:
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