Samsung 40" - Easy Fix

Discussion in 'General Electronics Chat' started by tom66, Sep 11, 2011.

  1. tom66

    Thread Starter Senior Member

    May 9, 2009
    This particular range of Samsung TVs has a *very* common problem, and an easy fix. The problem is that the TV will not turn on or will only occasionally turn on. Often, a clicking sound is heard during this time, but not always - in my case it only clicked once but nothing happens. The clicking comes from a relay on the power supply.

    The problem is two bad capacitors. Samwha XC series, or as I like to call them, crapacitors. Both are 2200u 10V. They appear to filter the 5V output. Luckily I have some Rubycon YXF's left over from my LG LCD repair, so I fitted those - it works :D.

    The capacitors in mine were hideously domed, and were even leaking a bit of black liquid, which had caked on the top of the capacitor. It's a miracle it worked even occasionally.

    It looks like the TV is less than 2 years old, and has not been used for a while, as the Freeview tuner has many old channels that have not existed for a while still stored.

    I got it from the local tip for the sum of £25 and it cost next to nothing to repair.

    Screw Samsung for making crap TVs. Don't get ripped off by Samsung!
  2. PackratKing

    Well-Known Member

    Jul 13, 2008
    Geez, Tom, sounds as though the newer run of teevees are rather straightforward to fix.. I had a similar situation to your Samdung :D and found the relay to be toast as a Vizio.........

    by removing the relay to determine what pins did what, I jumped a better one in on wires, and solved the problem, and stuck the relay on the PCB with a good dollop of hot glue.
  3. tom66

    Thread Starter Senior Member

    May 9, 2009
    The relay seems to just control the power supply mode (probably PFC or slow-start) it wasn't the actual fault. The bad caps seem to cause cycling of the main board or power supply. Good to hear about your Vizio, from what I have heard they aren't much good either.