Im trying to repair a sharp 32" tv - model # 32U-F510 . Anyone have a schematic for this ? Or some advice ? The picture is sunken in at the sides . This happened one day when the owner turned it on. Here is a picture of it :
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there can be various reasons for this. a shrunken raster can indicate power supply problems but you have e-w bowing so check the horizontal scan areas. change electrolytic capacitors first.
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How Do i check the "horizontal scan areas" ?
change which caps? in the power supply ?
how do i check the horizontal scan areas ?
which electrolytics shopuld i check/change ?
Considering your question, you should be taking the set in to a service shop to have proper safe and reliable service for your set.
You have to have a good solid knowledge of TV electronics theory, and service experience to service your set. You will have to get the service manual, and follow through with a scope and DVM. That is how you will be able to find the defective parts! It is very difficult just from a picture to know exactly what parts are the cause. There are many parts in the horizontal scan circuits that can cause this type of fault.
There is a possibility that the fault is in an area that is referred to as the pin-amp circuit. It works with both the horizontal and vertical deflection amplifiers.
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JANA _____
how do i check the horizontal scan areas ?
which electrolytics shopuld i check/change ?
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Jana is correct, you will need an oscilloscope and full service information and a knowledge of how the various parts of the deflection circuits work unless you are VERY lucky in shotgunning repairs.
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