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Unknown electronic symbol

Discussion in 'General Electronics Discussion' started by carloncho, Sep 3, 2018.

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  1. carloncho

    carloncho

    1
    0
    Sep 2, 2018
    Hallo comunity,
    in a circuit diagram of a SMPS there are symbols D1 -D8 (see annex) which I dont know. Can anyone tell me what is the meaning and purpose of them.
    Thanks in advance for any answer.

    Carloncho
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,383
    1,785
    Sep 5, 2009

    I assume you don't really mean D1 - D8 as different types of diodes are referred to

    I suspect you really mean D1,D2,D5,D6,D7,D8,D19 and an unmarked one in the top right … prob. D9

    They are a twin diode pack

    upload_2018-9-3_20-28-51.png

    where the cathode of one diode is commoned with the anode of the other diode

    I would have to search for a specific part number
    are you sure it isn't already listed somewhere on the circuit sheet ?
     
  3. Externet

    Externet

    716
    149
    Aug 24, 2009
    Can be the lower right connected as counterparalleled, A1 to K1.
    [​IMG]
    When 'circled' can mean LEDs :
    upload_2018-9-3_8-12-14.png
     
    davenn and Cannonball like this.
  4. 73's de Edd

    73's de Edd

    2,761
    1,155
    Aug 21, 2015
    Sir carloncho . . . . . .

    Are you just grasping for straws in zeroing in on those parts, as being at fault?

    The schematic shows the 8 sets to be current and voltage sampling for the 4 (or more) CCFL backlight lamps and feeding back correction to the OZ960 CCFL controller .

    Give your specific SAMSUNG model number and more info can be forthcoming.

    With the board connected back into the unit and then plugged in and powered up . . .is 13VDC power present at the R15-R13 junction feeding pins # 3-4 of the OZ and pin 3 of each of the 4539 power driver FET's ?

    PARTS DATA . . . . . BAV99L

    upload_2018-9-4_11-40-47.png


    73's de Edd
    .....
     
    Richard9025 likes this.
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