Good evening. The TV, as per the title, was completely turned off at a voltage test on the power supply board marked "DPS-126CP" known that the 13 volt output of the "Q7911" appears but not on the "C7962" the 5 volt and present a light hissing from the card in question, I try to close contact 3 and 4 of the optocoupler location "pc7702" and I am pleased to note that the screen lights up even if it is white and the 12 volt that feeds the "T-CON" also appears in the part where the sensor controls appear remains off after a few seconds the TV switches off. I decide to replace the optocoupler mentioned together with the other three and I am pleased to note that now the sensor controls part lights up even if no flashing appears, the TV behaves as before with the exception of the sensors part which lights up as explained. closing pins 3 and 4 of the optocoupler mentioned, again the situation repeats that starts with the blank screen. The power supply of the optocoupler location "pc7702" is 9 volts, I think it is excessive as if there was no absorption by the integrated "ic7702 dda003a" but maybe I'm wrong. I try to follow the "AC_DET" line that refers to pin 9 of the "p9601" connector must be at a high level and in fact 3 volts appear, at pins 1,2,3,4, 13 volts appear and pin 11 i 5 volts.
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Re: sharp lc40le820e, il televisore rimane spento, non accende
Hello!
Power supply circuit
Ciao!
Schema di alimentazione -
Re: sharp lc40le820e, il televisore rimane spento, non accende
Good day.
Can you advise me on the problem?
The TV Sharp mentioned above to the owner recently worked by turning itself off after three hours of watching, and then repeating it over and over again after 20 minutes.
But now it cannot be switched on and the logo in the middle flashes twice at intervals. According to the service manual, this is a fault in the power supply board. After the measurement, I found that the PD connector was missing 13.2V.
On Q7911 the SOURCE is fluctuating 14.2-14.35V
on DRAIN is 0V
at GATE is 14.19-14.38V
Thank you for any adviceComment
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Re: sharp lc40le820e, il televisore rimane spento, non accende
On the schematic check what voltage you have at SW because it looks like the mosfet Q7911 is not being turned on.
Can you give the voltages on Q7921 and Q7061Willing to help but I'm no expert.Comment
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Re: sharp lc40le820e, il televisore rimane spento, non accende
No good hijack others one's thread.Comment
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This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.
I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match... -
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Hi folks!
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Hello Sharp TV experts
Our Sharp LC-80LE642U displays one short one long flash error code which is a backlight error. I went into service mode and there were 8 lamp error counts recorded. I reset the count to 0 and did a reset. The last monitor error cause was 16 B00014639:12. 16 is the code for backlight error. I tried to power the tv up but went back into error mode.
> I checked voltages on the power supply board and they all check out .. including 3.28 volts at the error pin.
> There is power to the cpu and T-CONN and no faults found there. The cpu has a flashing...01-24-2025, 11:51 PM
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