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Video problem tv has no video,but sometimes shows a picture than pic goes out. tried video processor ic2200 same problem,checked abl line and voltage. check v&h pulses, checked data and clock lines.

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Check the solder joints on the vertical output IC. I am not sure if that model has the PIP module, but if it does then resolder those connectors, too.

Posted on Jun 29, 2007

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How do I restore missing video?

Video processor IC [Chroma IC] fault. Replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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I have BPL 21 Studioline 1000W, problem is suddenly the picture is becoming a thin Horizontal line at center, sound is perfect, when i beat with hand behind the TV picture is back to normal state, picture...

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

The fault is the FAILURE OF THE SOLDER IN THE VERTICAL IC OF THE TV.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

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please don't take this as me doubting your intelligence, but are you sure your wires are good? sometimes they can become worn out inside of the protective rubber, and partially fail.
Also, how old is the TV? I just got one (for free so i can't complain) from a friend that will start in color on av and then turn to black and white because something inside of it went bad..
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