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LG L1718S Flatron 17" - Power supply

pippo61 17 Lip 2009 13:46 5219 5
  • #1 6789609
    pippo61
    Poziom 10  
    A cordial regard to the participants of the forum.
    After storm video k.o. on the plate feeding I have replaced the fused ones 2.5A, the video not from signs of life also the green led is out, I have checked the various components of the switching resistances condensers unloaders they are good I think that you/he/she could be the initialed IC TOP245YN but I don't know how I can make a will him/it.
    If you know me to give a suggestion I in advance thank.

    A regard Attila.............
  • #2 6799753
    WojtasJD
    Poziom 43  
    How about voltage on big capacitor: 100uF/450V ?
    Do you hear any sounds from flyback transformer?
  • #3 6800484
    pippo61
    Poziom 10  
    Thanks WojtasJD for your polite answer.

    On the capacitor 100µF have 313v DC and I don't feel any sound from the transformer .
    A regard Attila......
  • #4 6803558
    WojtasJD
    Poziom 43  
    Ten minutes ago I've just repaired the same model (L1718S-SN) - one of internal diodes in UFF80-015 (fast recovery diode on heat-sink - secondary side) was damaged (shorted). After replace the monitor is fine.

    So check +5V and +12V - if they are OK we can go to signal PCB :D

    If not, check voltage on TopSwitch-GX DRAIN (leg number 7) and CONTROL (leg number 1).
  • #5 6809081
    pippo61
    Poziom 10  
    Thanks still WojtasJD.
    The diodes UFF80-015 and SRF1040 are good, on the DRAIN 317vDC, on the CONTROL 4,5vDC.
    A regard Attila.....
  • #6 7267971
    pippo61
    Poziom 10  
    To whom can interest I have resolved replacing TOP245.
    Still thanks for the answers.

    Attila.............
REKLAMA