The entire power board is effectively dead. Start by removing the board from the tv and checking it separately - it might be shorted by an external consumer or in might not be triggered by the processor of the tv - start it yourself to check that. Then check the main switching transistor - it might be fried. Then check the main transformer - it might be shorted. Finally check the regulator circuits, if might have failed. If this is the case then you will have to replace the entire power board - individual parts are not offered as spares.
Hello, Assuming you are not attempting to play it at ear shattering levels, this may be due to an alignment problem in the IF/audio demodulator, a bad audio IC or other circuitry, bad connection, or a defective speaker.
If your TV has an earphone or audio line out jack, try this to see if it is clear. If so, then your problem is in the final audio amp or speaker(s).
If only one channel of a stereo TV is affected, it is almost certainly the audio amp or speaker for that channel. Interchange connection to the two speakers temporarily and see if the problem moves.
If the problem is at all intermittent - try gently whacking the TV - then it is likely a bad connection - either a cold solder joint or a dirty or tired IC socket.
The audio amplifiers in newer TVs are almost always ICs and replacements are usually readily available. If the IC is in a socket, remove the IC, clean the pins and socket contacts and reinstall it. Sometimes, the contacts on old socket lose their springiness and do not provide solid connections. Such a socket will need to be replaced.
If the set uses discrete transistors, it s also possible for one of these to become noisy.
If your TV is fairly old - 10 years or so - this may be an alignment problem requiring tweaking of a coil in the sound IF. See your service manual. It may be possible to have similar problems with newer TVs but this is relatively rare. There could also be bad electrolytic capacitors, probably in the power supply area. Even though you might think this would result in hum and there is none (even when there is no audio in the program or the sound is turned down) dried up caps can result in distorted sound that may sound like a sort of clipping. An ESR meter is best for testing (with power off!) but carefully jumpering known good caps across suspect ones (again with power off, then turn on the set and check), will eventually find the bad one(s). Hope this help...
The changeover should not show up this way. Also, the changeover only effected those that use an external antenna. If you have cable or satelite, the changeover should not have effected you at all. If the set is no longer under warranty, you could check for poor solder connections. These tend to be effected by heat. Have you noticed any particular pattern to when the sound goes off? In other words, does the set need to be in use for a long time before the sound cuts out?
Please update this and we'll look further.
If the unit is still under warranty, report the problem as an intermittant one. That way if not completely resolved within the warranty period, the "problem" should be covered anyway.
Thank you for posting your question on Fixya! However I need a bit more info to resolve this problem for you. When this happens what is the status of the standby/timer LED? Does it just stay on or does it blink? If it blinks then how many times does it blink in between each pause? The blinking is a diagnostic code that helps us identify the faulty board/components. So please provide this info as accurately as you can so that I can help you resolve this issue.
Resetting the TV If the buttons on the
remote AND the buttons on the TV case do not work (channels do not
change and you cannot open or navigate the menu), the TV has stopped
responding. Reset the TV as follows:
NOTE: Some
TVs have a reset button. If available and accessible, try using the
reset buttons before using the steps below. Using the reset buttons can
save time.
1.Unplug the TV power cord from the power outlet. 2.Unplug any connected devices (DVD, Set-top boxes, etc...) 3.Press and hold the TV power button for five seconds. 4.Plug the TV power cord back into the power outlet and turn on the TV. 5.Open the on-screen menu to confirm that the TV is responding again. 6.Turn off the TV and reconnect the devices. 7.Turn on the TV.
With just those set of symptoms - and nothing more - my first guess is that the power supply (PS) board has a problem. It is possible to replace the entire board, but it is also possible that the board could be repaired. The PS is not an inexpensive item so my best advice would be to have a professional look at it and estimate the problem. Then discuss the options repair/replace...
Bill
Without looking at the set I would think the problem was in the optic block. An expensive repair, but, since the set is only four months old it's under warranty.
Go to the service section of Panasonic.com and find an Authorized Service Center (ASC) in your area to have the set repaired.
Good Luck.
Check the Input Source: Make sure you have selected the correct input source on your TV for the device you are using. Use the remote control to cycle through the input options until you find the one connected to your video source.
Check Video Connections: Ensure that all video cables (such as HDMI, component, or composite cables) are securely connected between your TV and the device you are trying to watch content from. A loose or faulty cable connection could result in a loss of video signal.
Restart the TV and Video Source: Try restarting both your TV and the device you are trying to watch content from. Power off both devices, wait a few moments, and then power them back on. This can sometimes resolve temporary glitches or issues with the video signal.
Check for Software Updates: Make sure your TV's firmware is up-to-date. Sometimes software updates can resolve compatibility issues or bugs that may be affecting video playback. Check the settings menu on your TV for an option to update the firmware, or visit the manufacturer's website for instructions on how to do so.
Reset Video Settings: If you've made any changes to your TV's video settings, such as resolution or picture mode, try resetting them to their default values. This can sometimes resolve issues with video playback.
Try a Different Device: If possible, try connecting a different device (such as a DVD player or gaming console) to your TV to see if the issue persists. This can help determine whether the problem lies with the TV itself or with the original device you were using.
Contact Panasonic Support: If none of the above steps resolve the issue, it's possible there may be a hardware problem with your TV. In this case, you may need to contact Panasonic customer support for further assistance or to schedule a repair.
Check the Power Cord: Ensure that the power cord is securely plugged into both the TV and the power outlet. Make sure there are no visible signs of damage to the power cord or the plug.
Inspect the Power Outlet: Try plugging another electronic device (such as a lamp or a phone charger) into the same outlet to verify if it is functioning properly. If other devices work fine, then the issue is likely not with the power outlet.
Check for Tripped Circuit Breakers: Check your circuit breaker or fuse box to see if a circuit breaker has been tripped or a fuse blown. If so, reset the circuit breaker or replace the fuse and try plugging in your TV again.
Test with Different Power Source: If possible, try plugging your TV into a different power source altogether, such as a different room or building. This will help determine if the issue is specific to the power source you were previously using.
Contact Panasonic Support: If none of the above steps resolve the issue and your TV still does not power on, it's likely that there is a hardware problem with the TV itself. In this case, you may need to contact Panasonic customer support for further assistance or to arrange for repairs. Be sure to provide them with details of the troubleshooting steps you've already taken.
Turn off and unplug the projector.
Locate the lamp cover on the projector.
Remove the lamp cover.
Take out the old lamp.
Insert the new lamp.
Replace the lamp cover.
Reset the lamp hours:
Press the Enter button to display the "Option" menu.
Use the 5 or 6 button to select "Lamp Runtime".
Press and hold the Enter button for approximately 3 seconds.
The "Lamp Runtime" will change to "Time Reset [Power Off]".
Turn off the power and disconnect the power cord.
Finally, plug in and turn on the projector.
Remember to consult your projector's operating instructions manual for specific details and safety precautions. How to change Panasonic vx 400 xga projector lamp change or replace (youtube.com)
