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fixing Led lamp power supply

Discussion in 'Troubleshooting and Repair' started by pharaon, Mar 29, 2021.

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  1. pharaon

    pharaon

    378
    6
    Oct 28, 2014
    i have 48 pair of led connected in series total of 96 LED,the circuit failed in capacitor C1, the IC is TA320 which i can't find any datasheet for it except this information from Chinese webpage
    Brand: Beijing-mode
    Model: TA3720
    Package: SOP-7
    Input Voltage: 100-264V
    Power range: 18W
    Typical applications: serial 50 100MA
    typical efficiency: 88%
    Program Features:
    ①IC prostrate closed loop structures are used, no flicker, no When the current is off, the lamp beads will not die, and the lamp will not flash when wet.
    ②Support 1-50W power range, below 50W adopts built-in MOS/SOP-8 package structure.
    ③Achieve true full voltage output below 24 strings.
    ④Support PC20 core material, support chip I-shaped inductor.
    ⑤High-frequency and high-speed switching, the maximum frequency can be 120K, reducing inductance coils.
    ⑥Support the full service of the original factory FAE.

    here is the diagram
    [​IMG]

    C1 value is 6.8μf,400 V which i can't find a replacement for it, i tried 10μf,450 V but that unfortunately blow the rectifier bridge.
    R1&2 = 150KΩ
    R7 = 1.9Ω
    C2= 2.2μf 50V
    R3 = 1MΩ
    there's no R4 or R5 in my circuit

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    if i can't fix with different capacitor cause i can't find 6.8μf can i build suitable power supple with different component to power up the LED lamp
     
  2. pharaon

    pharaon

    378
    6
    Oct 28, 2014
    it will cost too much to be shipped to my country ,more than the lamp price it self
     
  3. Bluejets

    Bluejets

    4,652
    983
    Oct 5, 2014
    /20..?
     
    bertus likes this.
  4. 73's de Edd

    73's de Edd

    3,070
    1,299
    Aug 21, 2015
    Sir pharaon,

    I think that if you will measure from TA 3720 pin 5&6 over to pin . . . . . 7 and / or 4 . . . . . that you will read the low ohmmage of a short from drain to source of the power output FET that is built within that TA 3720 I.C.
    Therefore it . . . . . will blow / has blown . . . . . the FWB with the resultant AC inrush to the 6.8 ufd . . . . uber-damaging it.
    Therefore a 10 ufd as you tried to use, would have worked if the above mentioned situation was not present.

    i have 48 pair of led connected in series total of 96 LED

    Now, you say 48 LEDS in series . .? ? ? . . .
    But might that actually be paralleled groups, which are THEN being wired in series, like:

    Two groups of 24
    or
    Three groups of 16
    or
    Four groups of 12
    or
    Twelve groups of 4
    or
    Sixteen groups of 3
    or
    Twenty four groups of 2

    ( The BLUE - RED combinations are less likely )

    Can you confirm the TA3720 ohmmage readings now ?

    73's de Edd . . . . .

    Now a days, you are all time reading about some select people saying . . .

    I have always felt like I am a woman trapped in a mans body . . . like Bruce Jenner
    or
    I have always felt like I am a man trapped in a womans body . . . . Like Chastity Bono

    Well now . . . . you wanna know WHATS ?


    upload_2021-3-31_4-40-15.png

    .
     
    Last edited: Mar 31, 2021
  5. pharaon

    pharaon

    378
    6
    Oct 28, 2014
    sir 73's de Edd thanks for replying
    [​IMG]

    total of 96 Led every 2 are paralleled when i connect on diode mode to one led two light together, and 48 groups in series

     
  6. Bluejets

    Bluejets

    4,652
    983
    Oct 5, 2014
    Ed wanted 5&6 to 7 and or 4 ......the dot is usually pin 1 so you've given 1 to 5 and 8 to 5.
    Couldn't see any data sheet on TA3720 so cannot be certain.
     
  7. pharaon

    pharaon

    378
    6
    Oct 28, 2014
    hope you can tell me which legs on the picture to test
    [​IMG]
    [​IMG]
     
  8. pharaon

    pharaon

    378
    6
    Oct 28, 2014
    any update
     
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