Picture is good
First, check the volume and mute settings, especially if there is another person in the house who may have changed them, and check another channel or input to ensure the signal source is not the problem. Next, verify that the sound is set to use the internal speakers, or that the external sound system is set to the input from the TV (some TVs with external sound output connections can be set to disable the internal speakers so they don't interfere with the external sound).
If you have no sound on any input, muting is off, and the volume indicator acts correctly, then the audio circuit on the main board is defective, or the audio power supply needs to be repaired. If your TV has a sound output connection that you have not connected, try connecting it to an external sound system and setting the TV sound to go to the external sound system. If it works, then you have narrowed the problem to the sound power amp in the TV, or to a bad power supply (some TV models have a power output specifically for the audio amplifier, although that is not common).
Most of the time, power supply failures in LCD TVs are the result of burned-out electrolytic capacitors. These are usually identifiable by the domed-up top of the capacitor, as pictured here. Note the flat tops on the good capacitors nearby. If you see these on the power supply board (the cable from the power board connector goes to the power supply), have them replaced with Panasonic FR-series capacitors; these usually have the best combination of price, power handling capacity and longevity.
SOURCE: tv powers up have sound no picture erea 40 lcd
DO NOT under any circumstances hit the neck of the picture tube. While it is possible that the tube is bad, that is not the most likely cause of your problem. Please post the make and model and I'll provide additional details.
Thanks,
Dan
SOURCE: Samsung LCD 40 Sensor & picture problem.
Since this is affecting several functions, the problem is likely the main power supply.
It may be that the supply itself is failing (switched mode power supplies like hari-kari) or an assembly (possibly the backlight invertor) is producing a fault condition which is causing the supply to drop out to protect itself.
Try the instructions below -
The supply is normally built on a separate board
since these are often out-sourced by set manufacturers.
Unplug your set overnight to allow potentially
hazardous voltages to discharge, remove the back panel of the set so you can
see the guts.
Look for a smaller board with larger parts on
it; some cylindrical (capacitors), others block-like and relatively large
(chokes and transformers).
You should also see a relationship between the
board and the incoming AC.
Check the board for a label or if not present, a
stamped-on number.
Call the manufacturer's service center with your
TV model number and the number found on that board and inquire about
repair/replacement costs; if both are offered, they won't be that much
different.
If you must buy a new board, don't dispose of
the failed one as there are smaller companies that can repair it for less than
the mfr. and then keep it as a spare as this problem will likely arise again.
SOURCE: I have a 40" Proview LCD flat screen tv Will it
This problems i fixed it before for other LCD tv models.The tv Tuner signal board is the causes and the problems.That the board,where the incomming broadcasting signal cable plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner signal board for the replacement.Will solved this problems.
SOURCE: i have a luxor 32" lcd tv and i cant get my surrond sound speakers to work. how do i do this?
Hi well surround sound speakers require an "Interconnection" box, that is a box with Jacks that the Red & White stereo audio plug into, on one side, and the 3 SS speakers plug into the "Other side" as it were. Usually with SS we have a Rear, Front and Sub Woofer, as this means 3 sets of speakers must mate with the 2 outputs from the TV etc. So the "Line Out" stereo output from the TV, which are usually the Red & White, is the output to the interconnection box, from there it feeds into the SS decoder, some plug directly into the decoder itself, and don't use an interconnect box, but it's all the same in the end. The stereo output is fed into the SS decoder, and then SS signal is extracted from the sign in, and routed out to the appropriate speakers.
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