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Cordless phone SI transistor help

Discussion in 'Troubleshooting and Repair' started by mvsumanth, Sep 3, 2016.

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  1. mvsumanth


    Sep 3, 2016
    Hi people,
    Recently, my old cordless phone stopped receiving telephone line audio. I opened it to see one transistor blown off due to lightning. I called customer care, the "experts" there told it is an old device so they cannot repair it. I decided to do it myself, checked a lot on internet, could not find the component and reached here.
    Below are the details:
    Device-Panasonic cordless phone KX TG 6442. Could not find the schematic anywhere as it is an old device.
    Fault and history-one transistor was blown due to lightning. There was no telephone line connectivity. Then I replaced it with a 547, the tel line started working but it the line doesn't reset when we press the 'SPEAKER' button. That means, my phone is always in the 'receiver off cradle' state, gives a busy signal always.
    I cannot see the specs printed on the transistor as that is chipped off.
    Could you please let me know what is the transistor number or if I can replace with another component?

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    What is written on the other side of the board where this transistor goes?

    Do any of the pins connect either the points marked vcc or gnd?

    Are the points marked vcc and gnd connected to the + and - pins on the bridge rectifier below and to the left of this transistor?
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