Thanks for the answer, yes i have low experience in TV reparation but i dont have the schematics for this TV, if you could send me this to my mail (firstname.lastname@example.org) or post the link it could be helpfull to solve my problem! And yes i hear a clicking sound. I can power on my TV sometimes and it work regular (clicking sound periodly), but sometimes when i turn on my TV, i hear two or more clicking sound and the TV turn off inmediattly! I am scare because an repair person on my country said that the problem is the ctr´s and want arround $1000 for repair it. I dont thing that the problem are the ctr´s.
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Re: I hear a sound like a shortcircuit on backside?
I think the problem is either the power supply/High Voltage board or the IHVT (Integrated High Voltage Transformer). I don't have schematics for this model, in addition you will need to take the IHVT out and perform a ring test on it, also I would advise you to check and see if the Horizontal Output transistor is shorted also, you can do this with an ohmmeter (measure between the collector and ground it should have a high reading if the reading is low the transistor is bad). The ring test can be performed with the use of a Universal Video Analyzer, or a LCR analyzer.
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The backlight bulb at its center has damaged. There will be more than 12 CCFL lamps which comes about the entire length of the screen at the backside of LCD screen to illumiate the screen, ahich in turn adjust its brighness according to the brighness we controls with remote. The center one of your TV is now bad. It can be replaced. You have to open your TV and disassemble the lcd unit to see and replace this lamp. If you are not familier with this work, get it repaired by some experienced service technician. It can be repaired at home. The lamp will have its ratings marked on it. Choose the same rated lamp. OK.
Can you hear some type of cracking sound from backside of TV when it is turned ON? If yes then these lines are due to leakage of high voltage current from FBT wire that goes into picture tube. This can be repaired. All you need to do is open the TV cabinet and keep it in sunlight (inside facing to sunlight) for sometime so that all moisture is gone. Make sure that TV is not exposed to moisture to further stop this problem. If this is not the case and you don't hear any sound then its some kind of SMPS related problem which can be repaired too. For this you need to contact a qualified technician.
Yes there is a schematic but it may not be the best approach to the solution. You may be losing a chip on your board because of what I call bad batch and Quality Control failure.Also the boards owner may not want their board schematic published. Most times when people experience these related problem's you are having they share Q&A in their related group. Daniel here is that group and your answer may be found there. If ths is not the answer you wanted to hear please don't rate. I have found my way around the last 30 years asking those that have been there and done that and it works for me. Click Here=> Norcold N821haywire! Thanks, Sea Breeze
Sounds like you need a new power supply. if you have component level troubleshooting experience you could open it up and see if you can troubleshoot down to the component in case you cant find the power supply board. DONT DO THIS UNLESS YOU HAVE EXPERIENCE BECAUSE YOU CAN BE SERIOUSLY INJURED OR KILLED BY ELECTRICAL SHOCK... if you dont have the experience take it to a repair shop to be repaired.
The popping sound may have been a capacitor. The chance are the capacitor is in the HV section of the TV set and is part of the supply to the Horizontal section of the TV. First if you do not have electronics experience I would suggest you take the TV to a qualified TV repair shop. OK now if you have electronics experience I would say to unplug the TV, open the set up and do a physical inspection of the TV you will be looking for a capacitor that has exploded; if you find one look at the schematic for the TV and find its value. Then do so checks to find out why did the capacitor explode. Most likely the capacitor exploded because of wear and tear, but it always pays to check. Replace the capacitor with one of the same value and then turn the TV on, use your voltmeter to measure the voltage across the capacitor to make sure its the same or close to the value on the schematic.
First of all I think you are hearing a clicking sound right? That noise is due to the HV shutdown circuit activating, indicating that excessive current is being drawn. Now the fact that the TV is on is indicating that the current level is right at the point of shutdown, now I would like to know if you have the schematics for this TV? If so locate the input to the HV trippler and measure the voltage with a HV probe, and compare it to the value on the schematic. In addition you say you have a convergence problem, for that I would say you have to change out your convergence amplifier modules.
Now let's get the the over all issue here: Do you have electronics experience? if so you will need a HV probe, a multimeter, and a pattern generator to solve this problem. If you have these pieces of equipment great, if not you will have to get them. If you do not know what these pieces of equipment are, close the TV up and have a TV repair person come and give you an estimate on the repair costs.
If this were in my shop I would triage the issues you are having,
First find that sound you are hearing (the exact location) and determine if it is a clicking noise or a burning noise (arcing).
Second repair that convergence problem, compare the voltage readings with the schematic
Third repair the HV issue
This should leave you with a working TV.
REMEMBER if you do not have electronics experience, have a TV technician take a look at this set.
The thin line means you have no vertical sweep. the popping sound was the vertical capacitor(s) or the vertical driver IC blowing up. this happens sometimes out of the blue and almost always when you first turn on the TV set. if you cam solder, Get a schematic diagram, then you should be able to trace out the curcuit and replace the defective parts. If you have no solid state repair experience, you really should take the set into a shop or have someone estimate the set for you. If you do have any repair experience, and can send me a schematic of the circuit I will be more then happy to assist you find out what the problem is.