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[Solved] Toshiba 32LV933G: Damaged DPS-140SP Power Supply, Replacing IC901-DDA010 w/ ICE2A265 or TM0365R?

masterten 10941 5
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  • #1 16889497
    masterten
    Level 33  
    Toshiba 32LV933G TV with a damaged DPS-140SP power supply

    Topics popular in this forum, the scheme is, but I have a question what to substitute instead of IC901 - DDA010?
    I have already learned that it is the ICE2QR0665 chip, but I would like to order in a store where they do not have one. In another forum I read that this system can be replaced with ICE2A265 or TM0365R, but in the diagram I see that the DDA010 has a ZC signal on the first foot (zero crossing), and the ICE2A265, TM0365R systems have a Soft Start signal there, is this difference significant?

    For a better view I will write what is broken: fuse, blown C910, shorted D904, burnt element J11 (resistor 0?) And burned path next to it. IC902 looks intact, IC901 also, but I suspect that it can "evaporate" as I repair the remaining damage, so I'm asking for a replacement.
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  • #2 16891031
    bogred
    VIP Meritorious for electroda.pl
    Check the primary winding trafaT901 yet.
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  • #3 17002906
    masterten
    Level 33  
    I have replaced items except C910, I think I can skip it for now.
    After starting, the fuse burned. I installed the old IC901 desoldering earlier and also burned the fuse. I desoldered the T901 trafo (no breaks, minimal resistances, but this is a small trafo with short windings), also without a fuse blown the fuse. I found a shorted transistor Q800, replaced it with a more powerful one (27A instead of 10A) and without soldering it hit again, "I used" one fuse.
    I noticed that despite burning the fuse, the C800A capacitor held 320V as if there was no short circuit, just the inverter was off / damaged ...
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  • Helpful post
    #4 17026290
    Folxs
    Level 13  
    I would like to share my experiences.
    I got a broken power supply from a guest from the service who advised me to bypass the first DDA010 protection in such a way that the small circuit that removes the J10 jumper is removed. Originally, the small system and DDA010 were burned, but it was all right.
    I ordered the DDA010 chip and replaced it, but after connecting without the first protection, it burned with live fire, pulling the trafo and the diode behind it.
    Also, or something else was short-circuited or I made a mistake somewhere that I connected the power supply itself without a load?
    This guy also told me not to try to repair because Chinese DDA010 replacements always explode and that's why he is not going to waste time - I think he was right, I don't know

    Toshiba 32LV933G: Damaged DPS-140SP Power Supply, Replacing IC901-DDA010 w/ ICE2A265 or TM0365R? Toshiba 32LV933G: Damaged DPS-140SP Power Supply, Replacing IC901-DDA010 w/ ICE2A265 or TM0365R?
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  • #5 17160052
    masterten
    Level 33  
    Folxs wrote:
    Chinese DDA010 replacements always explode and therefore he is not going to waste time


    I have to remember that next time I should start the repair with such a procedure: Blown fuse in the switching power supply? - Don't try to fix it ;)

    I eventually led to the explosion of the replacement together with the burnout of the trafo. The repair ended with the purchase of a used power supply.
  • #6 17160056
    masterten
    Level 33  
    Folxs wrote:
    Chinese DDA010 replacements always explode and therefore he is not going to waste time


    I have to remember that next time I should start the repair with such a procedure: Blown fuse in the switching power supply? - Don't try to fix it ;)

    I eventually led to the explosion of the replacement together with the burnout of the trafo. The repair ended with the purchase of a used power supply.
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