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Check the output voltage from its SMPS power supply. You should have some experience in service work to proceed. It it seems OK, then check the main board [horizontal output section circuit] and pin-cushion circuit for defective component/s. 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/
You can get an idea about the fault to an extent.
View the site by desktop or web view on mobile devices to see the "search box". Type in the brand name of your set in search box; to get gathered the related posts.
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. 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 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. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ Do a search by type in the brand name of your device at its search box.
The STR or voltage regulator is probably bad. If you are not familiar with soldering and using a multi meter for troubleshooting then I suggest buying another power supply they are not too expensive. Try e-bay. Good luck
The problem of your television is the abnormal screen like the pincussion in booth side and bar at top and buttom.The cause of that is the abnormal supply voltage of the crt board.The power supply have low output voltage because deffective and leak parts like the regulator transistor or capacitor.If the power supply is low voltage it affects the apperance of the screen of the TV.So its better to replace the deffective parts of you television to came back the normal appearance of you TV.If you do not know how to repair and troubleshoot its better to called a repair technician.
Hello
Replace its Horizontal output Transistor. If the base-emitter junction has a leak inside it, this type of fault will occur. Before replacing it, check the main DC voltage to LOT [Line Output Transformer]. It should come around 102VDC. If there is not this much voltage, check the electrolytic filter capacitor connected across thie supply line to main negative for open or value developed. Replace the same is good. Till there is low voltage found, check the retifier diode that rectifies this 102 volt DC. If all the above are OK and still you get a stamp like raster, check the heat of the Horizontal Output Transistor described above. if it overheats, LOT is defective and should be replaced with same type and number. OK.
Hello
Complete loss of horizontal oscillation and output is the trouble. To get it repaired you have to open your TV, Just look the horizontal driver transformer, a small transformer fitted on the main board very near to the line output transformer [LOT] for winding opened. If its primary winding gets opend, even though the horizontal oscillator section works, the pulses will not reach the horizontal output trnasistor, which drive the above said LOT, and the fault you describes will occur. Check the main secondary regulated supply voltage [140VDC] also. If this voltage is missing, check the reason and follo the supply rail print from the SMPS power supply reguator section.
Check the low voltage regulator IC, usually 7808 or 7812, which can be located on the main board, which supplies 8VDC or 12VDC to the ICs on the main board. Anyway, there is no horizontal output fuction in your tV. and try to find it. If you wants furthermore assistance, feel free to get me through Fixya. OK.
Hello
Seven continous blinks of standby light in Sony TVs indiates that there is some problem in power regulator side or on horizontal output side. It is due to high voltage shutdown. When the [EHT] voltage ie Extra High Tension voltage given to the final anode of the picture tube exceeds 33KVDC [33,000VDC], this happens. The cause may be in the power regulation side in your TV. Normally Sony TVs are working at about 120 to 135VDC. If voltage at this DC rail exeeds, EHT said above will increase beyond its limit, and CPU Ic inside your TV will detect it and shuts the whole system down to prevent further damages to more components. This is happening in your TV now.
This process is called saftey shutdown.
To rectify this problem you have to open the TV. Proper care should be taken before opening it as you are going to work with an electrical equipment, which has very high voltage points are there inside. All precautions must be taken before opening the TV.
Normally this fault will be due to the poor regulation of the power supply section inside your TV, that causes a voltage higher than normal is comming into the main circuit from power supply. STR type regulatros are being used in Sony sets for this regulation purpose. You just locate the power regulation side, and check for any loose solderings to the legs of the STR regulator or its nearby components. You must have some concept of sodereing in this matter. Components fitted on the power supply section will heat up while TV works. Ater long use, the soldering at the legs of the heated components may get loose. We can't detect loose contact exactly where it is. So it is a good practice to resolder the sodering of suspected components, and we in practical servicing field also do this trick.
If it doesn't help, the STR fitted inside may faulty. Desolder it out from the board and go for a same type and number. Replacing it will solve the problem. Ok
it is depend up on the power supply connector and it will give the output according to the smps you can do one thing try with installing other fan and see is it in perfect rotation.
bye
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