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sharp lc-40le blue LED on tv off

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oled

The device is a sharp lc-40le540e and has the following defects: pressing the power key on the TVC lights blue LED on the front but there are no backlight, video and audio.
In practice, in addition to the LED it does not light another, could be a problem of the power adapter?
Thank you very much

Comments
oled

Azt akartam próbálni, hogy indul USB TV stick betöltve a legújabb firmware +, hogy indítsa újra a TVC megkezdte a megfelelő működéshez.
Nyilván az alaplap nem indul, amelynek sérült firmware.
Szerencsére jól ment, és remélem, hogy ez az információ arra szolgál, hogy másokat.
Köszönöm szépen, hogy azok, akik ezen a fórumon kaptam a kezét.
Amíg a következő alkalommal.

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rakocziferi

Hi!You musd disassmble the display board and verify the backlight led bars;if you hawe no sound must mean the set is in one AV mode.
Bes regards:Feri

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oled

First thanks Dongo and Peti386, below the measured voltages on the output connector of the PSU: ok 5v, 12v ok, ok 5,75v, Pson blon 0v 3.4V, 3.2V PWM2, PWM1 dim 3.2V 3.2V.
The power supply can be ok?
Thank you

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dongo

The PSU is probably OK. How much voltages did u measure on the pins of the output connector leading to the backlits LED row? Masuring constant voltage is OK, but a decreasing value conclude to LED error. As Peti386 wrote before, the fault of one or more backlit LEDs can cause prohibit to start up the television.

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peti368
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Hi

I told you so.

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dongo

Hi,
Can you switch on and off the appliance using the RC? Are there any screen content(e.g. menu symbols) as you directing an intensive light source close to the LCD display?

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peti368
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HI

Power suply end backligt bad end to ban PSU.

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dongo

Hi, I think, the main PSU is faulty or other fault activates the protection circuit. Best regards, dongo

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peti368
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HI

Backlight fault activates the protection circuit PSU.

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