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Panasonic home theater SA-PT770 clicks once wont come on

Discussion in 'Troubleshooting and Repair' started by Pignapoke67, Mar 11, 2017.

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  1. Pignapoke67

    Pignapoke67

    1
    0
    Mar 11, 2017
    Tge system clicks once when i press power. Nothing else happens. Second press of power button wont get a click just nothing. Only when i unplug then plug in can i get an audible click from the machine. Otherwise unresponsive. Hate to replace it. I have a multimeter but have only used it to work on clothes dryers. Where should i start. Not afraid to dig in and learn something here. Cant make it worse...so... Appreciate any patient advice!
     
  2. 73's de Edd

    73's de Edd

    2,799
    1,171
    Aug 21, 2015
    Sir Pignapoke67. . . . . . . .

    We jes don't knows . . . . . .do you have the technoexpertise to pull the dust covers of the unit to get visuall
    access to boards.

    Then you use this supplied "roadmap" snippet of the AC power input to a portion of the units power supply.
    Initially check the right bottom corners fuse in YELLOW which should be good, if the relay still clicks . . . .as in the past.

    Precautionary & exploratory:
    .
    Visually check the next YELLOW box up and the one above it to see if it / they might have been damaged by
    a lightning hit to the AC line.
    Then do a like visual on the YELLOW box IC also . . . . . . . as it runs 48 hrs a day, as long as the unit is
    plugged into the AC power.

    If all seems visually OK . . . . . Use DVM metering in DC mode expecting a voltage in the order of 6 VDC on the
    YELLOW markup C5899 electrolytic capacitor . . . after turming the unit on . . . . and see if it HOLDS . . .then turn off..

    How ya' doin ?

    RELEVANT PUNYSONIC TECHNO REFERENCE . . . . .

    [​IMG]

    https://s22.postimg.org/cuu40kn4f/Panasomic_HT_Standby_Power_supply.png

    73's de Edd

    .
     
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