Question about HP Lc4276n 42 in. LCD Television
You haven't specified anything about its picture condition. Anyway, picture is correct, and only sound has probelm I assumes and answers. If picture is OK and oly sthere is no sound at all, check the speakers first. You can chek it without opening the TV. Place your ears very near to the speaker side of the TV, and switch it ON. if you can a "Thumb" sound [may be very small in amplitude]; speakers are OK; either the sound output section or sound detecting section inside the circuit bard is faulty. To confim which amoung this two is faulty, connect its audio output RCA sockets to any external audio equipment like amplifier or so, and check whether sound comes from it or not. If there is sound output through external amp and not with TV speakers, surely Audio Output Ic has the trouble and should be replaced with an identical type and number. If there is no sound from the amp also, that means the sound detection side circuits has got damaged. You must have experience and more skill to detect fault in this section. As you indicated that you have not much experience, leave it to any experienced technician to do. OK.
Posted on Mar 19, 2011
There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.
If you aren't tech savvy, this unit needs to go in for repair.
If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).
Most of the caps that go are 10V 1000uF or 3300uF.
I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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