Like others on this forum, I am experiencing the 'sound, but no picture" condition. Someone mentioned that there were 'a few things' that could be tried, but never said anything else. Can anyone elaborate on these 'things', please?? Thanks so much in advance!!
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Re: Sound, no picture...please help!
(Pasted from the one before -)
Since I can't see your screen, I'll guess.
If the picture shrinks away in the vertical, fast or slow, it is in the vertical control circuit.
If the whole picture shrinks in both axes simultaneously, the high voltage circuit is the culprit. This section is responsible for producing the accelerating voltage for the beam so if it is dropping out (quite common after years of use) there will be nothing to speed the beam to the phosphor to produce light.
Turn up the intensity when the picture drops out to see if you have any trace of light. If not, it is the latter problem.
If you can still see a horizontal line that flickers a little (from video content) then it is the first problem described.
IF the flyback (HV) transformer is still available, it will cost somewhere between $25-$100 US (many lower cost sources have disappeared) plus labor. Depending on whether the fault was the flyback or the high power transistor that drives it, there could be additional parts needed.
Since you indicated that it operates OK for a while, it could also be something as primitive as a failed solder joint and these can be tough to find (=$$ labor).
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Back-light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
This condition, sound no picture, is generally a result from a failed y-sustain and/or x-sustain board. You can check the fuse for continuity or resistance using a multimeter. I am helping someone repair their LG 42pc3d, that's why I thought I'd help you out too.
Y sustain board6871QYH053B Z sustain board6871QZH056B
I too had this problem and was resigned to having the laser mech replaced.............BUT! i opened up my unit (it was long out of warranty) and was suprised at the amount of lubricant on the cog that drives the laser and the track upon which it runs.most of the grease had been pushed to either end of it's travel and as a consequence my unit would cut out particularly at the start and end of CD's as the laser struggled to move and track the disc as it should. Since removing this excess lubricant (with a dry toothbrush) i have enjoyed over six months of trouble free listening. From searching online forums it would seem that many people have experienced similar problems with this transport - a Sony KSM213CCM - and have replaced the entire mech! it would appear that someone a the factory has been a little over enthusiastic with the lubricant! Hope this fix is of help
A possible solution to your problem could be that the audio and video cords are plugged into different jacks in the television. I have experienced the same problem and i found that by switching the video cord to different inputs on the tv i would eventually have picture. The audio seems to be fine so leaving that cord where it is should be fine. On the remote to his tv there should be an "input" button that changes which components the tv is reading. If you press the input button and the picture appears on the screen but the sound goes away then your 2 plugs for the game console are not in the same channel on the back of the tv. I hope this helps
there is a possibility that the lens assembly is not in the right angle like a piece is not in line, or a possible gear slipage, there are many other reasons why this is happening, you may refer to the pictures below.
question, does the camera give out an error message or when you turn it on and press the zoom, do you hear a sound from the camera itself?
if in case will you turn it one and gently push the kens sideways, because like waht i mentioned, a part may just be stuck.
It looks like you are having a high voltage problem where one or more of the HV components are failing. The picture starting off small and the growing as the TV heats up is a sign of this (high voltage) problem. The problem experienced when a bright scene occurs is due to poor high voltage regulation. I would suggest that you take this set to a qualified TV repair shop due to the fact that the section I am talking about deals with voltages that can be fatal.
I hope this helps,
It is possible that there are failed components in the CRT bias circuits, or one of the scan circuits, or in the power supply, or in the high voltage section.
When any one of the areas fail, the set goes in to protect mode and biases off the CRT. If any of the other areas fail, the picture will also go black. In some models of TV sets, the sound is not critical of these areas that are mentioned here.
To fix this problem, proper troubleshooting of the set will be required. There are many components involved in the TV set that can cause failures to appear to be of this type.
You will have to have the set serviced by someone who is experienced and equiped to do TV service.