Question about Televison & Video
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: aiwa mini-component
gidday mate... it does sound like a failure in the audio output stage. I suggest that you first check the speakers for short circuits as a fault here will produce a similar symptom you described. Check that you have the correct DC conditions about the STK, such as main power supply. Check all resistors that are in proximity to the STK, particularly lower value ones. Look also for shorted or dry capacitors about the output stages. Most of the audio signal path amplification is inside the STK and generally only a few millivolts of audio are provided to the input pins(usually the outermost pins). I have looked online for a data sheet on the chip that may be of help to you, but have not yet been able to find one. If the unit has soft touch electronically switched input selectors or electronic attenuator to the vol control, either of these IC,s may be faulty also. I am happy to keep going with this to help you fix it if you want. Give me a hoy back in here and I will :)
Posted on Jan 25, 2008
The cheapest option is to replace the transistors (a quick check on google will tell you how much they are). If they are common transistors you will be able to find them and get them quicker then searching for a board that could be no longer being made.
Posted on Sep 02, 2010
SOURCE: I have an RCA TV
The fact that the screen illuminates properly and does not stay absolutely pitch black means that the backlights are working properly.
A faulty LCD Controller Board (or TCon board for short) could possibly cause the symptoms you describe. The Tcon board is usually located under its own RF shield and will have a large braided steel multiwire cable coming into the bottom of the board and several flat ribbon cables connected to the top by little plastic flip up connectors. A replacement board can be purchased on Ebay for around $70 plus shipping. See the following link for one example:
Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the item information at the website indicated.
Just don't buy any that say AS IS for their description of condition. That is EBay speak for broken.
Make sure they say TESTED FULLY WORKING in the item description.
The best way to be sure you are getting the right part is to open up your set and check the part number that is printed directly on the circuit board itself. Then look that part number up on the internet or type that number into the EBay search box.
Just typing in the model number of your TV will sometimes give you a few different part numbers so you have to confirm which part is in your particular set.
Make sure any part that you order online has exactly the same part number as the one you are replacing. Sometimes it it just the last few digits that are different and it can make a difference.
Here are some links to some excellent LCD Troubleshooting Guides from another expert (BUDMRTN) that you can read through and get an idea of the LCD repair process:
Please leave a Thumbs Up rating on his pages if you find his guides helpful.
Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.
Thank you very much and good luck.
Posted on Apr 20, 2011
check if their is a signal on voltages around 3.3v at the inverter board if none their is a problem in the board which is in the processor.
Posted on Aug 31, 2012
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