LG 47LN5400 no backlight repair Part 1
Have you tried some Youtube suggestions about this model ? LG is a special brand most difficult to do something without an service manual , control for bad solderings (special on active components with heatsinks) , bad fitted fcc sheets connectors power supply In safety mode because of an failure somwhere.
SOURCE: Westinghouse W33001 Will not power on
I had that happen to my tv and took it to be repaired and it was the power pack where it attaches to the tv it just like snaps on and will arch and burn the power pack and it wont power on so the repair guy charged me $89 parts and labor he put one in but sodered it so it will not draw moisture and arch and it works great now....
SOURCE: tv will not power up
If
it's failing to turn on, the main power supply is probably at
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for a
separate board with mostly larger components on it; it will have a ferrite core
(no laminations as with a line-frequency part) transformer on it and several
larger capacitors which are cylindrical and mounted vertically to the board.
Before touching anything inside, especially on
that board, allow several hours to be safe since the larger capacitors can hold
a painful voltage charge for some hours.
If you see signs of overheating such as
discoloration of the board material, it may not be repairable but if you can
find a part number on the board, you might be able to buy the power supply and
install it yourself but it will likely have the same problem eventually unless
they have altered the design.
If there are no signs of heat damage to the board,
there may be companies offering to repair it as a subassembly instead of
repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the
power supply still may not be at fault since most are capable
of switching on and off if a downstream problem is causing an overload.
SOURCE: Blinking power supply LED
Your power supply is fried. I had the same problem with my Bestec ATX 250 power supply. I fixed the problem by installing the StatTech model: ATXPOWER250. It was easy to install and works well. It is almost identical to the original but more quiet. I got it for $29 at MicroCenter.com. Also at online Newegg.com, Radioshack.com, Provantage.com, June 20,2009
SOURCE: I have a Sharp lc-46d62u and it blinking when i
I had this issue and Sharp sent out a local repair tech to install a new main circuit board, then two weeks later, a new side board (where the side inputs connect into the system)...
SOURCE: tv won't turn on 4 blinking led
Hi,
Red led blinks 4 times is an error code that shows that fan is not running in tv, check fans connections and make sure all are plugged properly.
Thanks.
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