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That problem is usually cause of faulty capacitors on the power supply section..
Just follow this instruction to fix your TV..
1. Open the back cover of your TV. 2. Look at the power supply board..Its normally connected to the power cord.. 3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors.. 4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value.. 5. Some of the capacitors not bulged so its better if have a capacitance meter
You have a weak capacitors in the power supply. Your description has enabled me to say this is the solution. We TV techs call this "breathing". You may control some of this with raising the contrast and brightness to see the picture stabilize.You will need a TV tech to correct the power supply. I have not worked on projection TVs for some time. This is a classic problem with a classic fix. Thanks for asking and show all hands of support!
Whenever i get these types of problems especially in sony sets,i first clean all the video related boards,i use fast evaporation paint tinner,to get the flux and grime off,then resolder all or most of the flat pack ic`s (be carefull,if you cant do this,then dont) use a magnifying viser to check each ic for bridges and solder splashes,wash boards again with tinners after resoldering.This works for me 99% of the times.If you need the schematic for this set request it at firstname.lastname@example.org
first of all sony uses blinks as a means of an error code, on older models like yours could be weak CRTs, try turning up the screen controls a little, if the picture comes on the CRts are weak and AKB is holding them dark. the controls are in the front behind the cover.
possibly you have no high voltage, D board or splitter is bad, bad convergence ICs will cause NP, check the 3.15amp fuses if any are blown replace ICs both stk392-110 and fuse to fix.
Try (with your remote) hit Display + Channel 5 + Volume - + Power hit each key within 1 sec of each other and the tv should go into error check mode on the screen and display some data, record that and google.
as service rech has iold you that power supply is defective so it is not necessary to replace whole power supply.
you can ask him which part is defective that can be replaced easily.
as reputed company like SONY design is excellant.lot of protective ckts are there.parts are easily available.please request your tech. to replace part which is at fault.
I Just had the same problem with my Sony KP43HT20, was a blury picture with the red & green going bad.......My set had defective convergence IC's, they are known to go in Sony's..IC's run about $30 a piece.