To start off my tv is a standard 36" zenith inteq model number IQB36B42W. My tv was purchased 8 years ago and has worked fine until this year. My tv was moved to another room and worked great at first. Then one day I turned it on and the picture was too dark to hardly see anything. I eventually switched to the atenna view which showed some static (which was brighter) just so I could see the menu. The menu was completely black until I went through every option to finally see a slightly brighter picture. I turned the brightness and contrast up, but everything is still too dark. The setting I used for the tv is a custom setting and the other settings show too dark. One exception is a digital preset mode which gave me the slightly brighter picture. Another odd thing is that the picture-in-picture shows perfect. I also switched the input from the a/v connection to component video and that shows even darker. Can you please help me with this problem.
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.
Check the speaker/s first.If found OK; check and replace the damaged component/s at its audio output section circuit board.If needy, 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.Surf the site with patience. http://electronicshelponline.blogspot.com/
Zenith's service site lists a manual for a model IQB36B42W manual, and it will probably be close enough. But the site is pretty lousy. You can't just download the manual; you have to view it on the site. The manual is in djvu (deja vu) format, and Internet Explorer is required so an activex control can install a viewer your computer. It doesn't work if you try using Firefox like I do, and I don't know if Google Chrome will work either. But if you want to jump through all the hoops you can see if the manual helps.
You can also try calling LG Electronics customer service at (800) 243-0000. They own the Zenith brand now and maybe they can help get you a copy of the right manual.
May be you went to the wrong place, find another repair shop where they work that brand and type of tv. Doubtless, some parts are discontinued, but they will take parts of another equipment that are dismantled. Good luck.
I would check with LG/Zenith on this, there was a update sent out to add a collection cup in case this would happen. If leaked on the board it would be to costly on repair with the board is still available.
Open the TV amd turn it on in a position you can see the picture, possibly through a mirror. Now gently tap all of the metal heat sinks on the circuit board until you find the one that is sensitive it will have a small chip mounted vertically on it, with probably like 7-10 pins. The number on the chip will most likely be an "LA****" number. Now turn the circuit board (UNPLUG FIRST) over and resolder the pins. This is your problem 99% of the time. Be very careful there is High Voltage inside this TV.