My tv fuse blows out the moment i turned the power swich on .i have tried to replace the defective fuse two times using new fuse from the market.The old fuse size is 3.15 and i used the same fuse size for the replacement but the problem still persists.What do you think is the probable cause?
This set uses a switching power supply. Usually when there is a short on the output side of the switching transformer the supply will just shut down and refuse to operate but normally will not blow a fuse. If the fuse blows suspect a problem with something shorted on the input side of the switching transformer such as I801 regulator IC, diode bridge D801,or other shorted component. Perhaps someone else could tell both of us any other part that could cause the regulator to blow and should also be replaced to prevent regulator failure in the future.
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Re: My tv power does not come on
You have a short somewhere in the set. The majority of the time it is the Horizontal Output Transistor and probably the flyback but it could be anything. I've seen vertical ICs short, electrolytic capacitors, audio IC's, you name it. If the HOT checks Ok you will need to do systematic troubleshooting which may be beyond you're abilities. If so, hire a professional. In any case remember safety. These sets can be dangerous. Good luck.
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They also have spare parts and offer free online advice as you attempt a DIY. The issue is most likely a cold solder somewhere on the power board or some faulty capacitors.
If you want to go in for a long term solution, you can
easily replace the whole power board or just change the faulty capacitors. You
will have to open the back panel and take a look. You can make out which are
faulty, because their caps will be swollen on top. Here's a sample pic of a
bust capacitor (not same model):
Check the specifications of the faulty capacitors, and get the replacements
from your local electronics shop. If you are comfortable with this, you can use
a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors.
Once that is done, solder in the new capacitors carefully. If are unsure how to
do this, try to get a friend who knows this kinda stuff to do it for you, or
get a qualified technician. Warning: If you do not have a background in
electronics repair, or are inexperienced, get a qualified technician to do it
REMEMBER there are very dangerous voltages inside a TV
that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT
THE POWER BEFORE YOU DO ANYTHING.
These things draw a huge surge current when turned on. What size fuse are you blowing? These things can surge 10-12 amps on turn-on. What about a fuse with a reset button. They will take alittle more surge before they go. Don't matter about the insignia working before because the cheaper sets tend to stay powered up more when off....thus not surging on from a dead start. Could you try a different plug on a different circuit/fuse? and see if that makes a difference. If you have a 15 amp fuse, then your pretty close with other stuff plugged in. What size is your service? Do you still have an original 60 amp box with screw in fuses? Is it an old house?
Assuming you are absolutely sure the TV is getting power,
If you have an ohmmeter, measure the resistance between the two prongs
on its plug. If no conductivity (over 1 meg Ohm) the fuse inside
is popped. Take the cover off, look in the area near the
power cord, it is the usual 5AG type (glass cylinder) fuse.
If you replace it and it pops again then measure all the diodes in the
rectifier circuit (near the fuse).
Many times power transients will just blow these input power
devices. However, many times it will go much deeper and get
the TV's processor brain. If the TV is anywhere near 10 years
old, I wouldn't go any deeper than the input power circuit.
ok appaloosa! is the fuse blowned again? if blow you have fault unregulated power section, you have defective parts like.. leak degausing or defective diodes or capacitor and or regulator IC. 2nd. defective horizontal output. if not blow the fuse u have fault oscillation!
When a fuse blows out thats an indication that theres a short in the set and the fuse is installed there to prevent a fire fom happening in the set. unless you know the HI Voltage safty issues with a tv set there are no user serviceable parts inside these sets and these tvs should only be worked on by trained service personel! The problem that occouring here could be a shorted or leaky bridge rectifier, a shorted and or a bad horizontal output transistor as well as the flyback transistor and the trsnsformer, or a bad componet in the power supply.. Good Luck