Question about Samsung SyncMaster 172N 17" LCD Monitor

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Dead samsung 172n power light flickers

Green power light flickers.(60 cyles) ticking noise from powersupply. Disassembeld replace all out put capacitors on switchmode powersupply. did not fix.. disconnected the inverter circuit still ticks. any ideas? this unit uses the "top246y" switching circuit not much there to go wrong xcept a few zeners and 2 caps....

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  • Rob Jan 03, 2009

    logic board ok with it dissconnected it still clicks.



    no the dc out put is not at 5 v / 13 v like its sposed to be



  • Rob Jan 04, 2009

    the switchmode powersupply ticks like its going into shut down/ protect mode. the output voltage fluctuate everytime it ticks. i have removed all power draw from the logic and inverter boards by removing jumpers from key circuits. The only thing i didnt mess with was the 5 volt section as it has the feedback circuit for the switching pwersupply.

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Have you checked the power output from the power board? Is it constant and steady? Try reflowing all the joints if you haven't already. Especially transformer and coil joints. Maybe a bad logic board? Do you have spares to try? Does it do this with everything disconnected from the pwr board (switch, logic, inverter)?

Posted on Jan 03, 2009

  • Chris McLellen
    Chris McLellen Jan 03, 2009

    What is the output voltage at if not 5v/13v. Is it jumping up and down? Or just nada?

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