Panasonic TH-42PX70B Blowing mains fuse.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Steve.B
    Senior Member
    • Dec 2008
    • 83
    • UK

    #41
    Re: Panasonic TH-42PX70B Blowing mains fuse.

    Originally posted by tw2005
    Nice , So all those were bad or were the driver and smd FETs just precautionary?
    Both of the smd fets were bad, one was o/c, the other had a constant resistance of 57ohm between gate and source.

    Not sure about that driver chip, did not know how to test it, and did not want to start probing the new one i bought for comparison to the old one in case i damaged it. The new driver chip only cost a couple of quid, so i decided to swap it, just in case it was bad. And seeing that there were so many components in that circuit that had failed, i think it was likely the chip also had a fault.

    I will say one thing, i am glad i had a small tip for my iron, those fets were tiny. I had some flux paste, so i used that to stick them down in the right place before i soldered them.

    Tv seems to be happy running with the 0.22ohm ceramic resistors in place of the 0.12ohm it should have. I have now found a source for the correct value ones in Germany, so have ordered a couple. http://www.ebay.co.uk/itm/3605151691...84.m1439.l2649 Had to settle for axial in the end, but they should fit ok.

    Comment

    Related Topics

    Collapse

    • stav242
      Samsung BN44-006056A Blowing Mains plug fuse.
      by stav242
      Hi,
      ive picked up a Samsung UE32F5500AK TV with a BN44-006056A power pcb.

      It was reported as `blowing the fuse` - the 3A one in the plug.

      on quick inspection of the power pcb, a ceramic capacitor CM802 has blown apart.. photo attached.

      Ive found a PDF of the circuit schematic and can identify the neighbouring components (RM801, RM802) but cannot find CM802 on the schematic.

      Can anyone identify what CM802 is ?

      thanks.
      S....
      12-30-2021, 10:45 AM
    • Tips
      Samsung PD27AOQ (BN44-00506B) constantly blowing internal fuse.
      by Tips
      Looking for some assistance please.
      Trying to repair a PD27AOQ samsung power board.
      Initially had the typical problem of cm806 capacitor blown, additionally thermistor NT801s blown.
      Replaced the ceramic capacitor, str60252s, bridge rectifier, thermistor and fuse.
      Testing it the fuse blows immediately power is turned on.
      diodes dm852 and dm853 test as shorted when in the board but fine when removed.
      any assistance, guidance would be appreciated.
      04-11-2024, 11:24 AM
    • Rictech
      Panasonic SA-MAX770PU SMPSU board fault....
      by Rictech
      Hello everyone. 😀

      As per thread title, this unit has a serious SMPSU fault. It blows F1001, which is a 10A M205 in the phase from the mains input.
      Very first thing I tried, was simply replacing the fuse, but the replacement ceramic fuse blew immediately.

      Looking at the schematic for this PSU, I then removed what I thought was the next likely candidate: D1001 - the HV main bridge rectifier.
      This isolated the fault(no longer blows the main fuse), but does not point me to the actual fault.
      There are no devices that have exploded or otherwise show signs...
      08-26-2024, 01:05 AM
    • corrize
      A funny fuse story – Lumix LX100 II
      by corrize
      Hello, I disassembled this dead camera, and found this WTF… Two fuses soldered one above the other !
      I was pretty sure nobody touched it before, but that can't be from factory. There is flux, and capacitor is probably missing.
      The other weird thing : the fuses are « G » fuse : (0.75A – 8V), seems very low. The original fuse should be « O » : (32V 2,5A).
      There is « O » mark beside. All fuses have the same mark letter on main board. So, I can deduce it's a « O » fuse.
      And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping...
      10-19-2023, 09:58 AM
    • Bootleg1
      Samsung UN65KS9800FXZA T-con fuse blowing
      by Bootleg1
      Hi all, so i was watching tv acreen went black and no sound. Traced problem to blown tcon fuse. Replaced and it blows replaced again samething. So my tcon fuse keeps blowing. I bought a new board havent installed yet infear its just going to keep blowing the fuse. If i only connect the right side ribbon cable the fuse doesnt blow but as soon as i connect the left cable my tcon fuse instantly blows and no picture. The right side picture works clear as day and left side picture is grey (picture attatched) im hoping its a bad tcon board itself or a cable or anything and not the panel. Thank you for...
      02-04-2020, 01:05 AM
    • Loading...
    • No more items.
    Working...