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Samsung UE50NU7090U Power Issue: Voltage Fluctuation and LED Off

amennone 768 2
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  • #1 21304966
    amennone
    Level 10  
    Samsung UE50NU7090U
    UHD TV - 7 Series
    BN96-46823A
    CY-NN050HGNV6H
    By inserting power, on the diodes DM856...Dm859, there are 9 volts, when you press the power button the voltage is 12 volts, voltage present for a few seconds, then returns to 9 volts
    The power LED remains off, always.
    Reprogrammed Ic 503 = 25Q40 and IC 501 = 25Q80, downloaded from the site
    The situation remained the same
    https://remont-aud.net/dump/lcd_pdp_tv/samsun...rd_bn96_46823a/241-1-0-114895#google_vignette

    Samsung TV mainboard with indicated power supply voltages.
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  • #2 21357178
    abramkyr1995
    Level 8  
    Change the IC of OVP (Over Voltage Protection chip).
  • #3 21358040
    amennone
    Level 10  
    Sigla dell'OVP ?
    Grazie
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