Continuous blinking of standby light with this models Sony sets indicates that there is some short or data missing from serial data from system control IC (001 – M37273MF-252SP). Pin number 38 of this IC is Serial Clock, and 37 are serial data output. Check the voltages at these two pins. Check the voltage at pin number 37. It should be around 3.5 to 4.3 VDC. If you have an oscilloscope or a millimeter which can measure frequency. Check the digital waveform or frequency with it. All other functions of this TV is controlled by these two signals emerges from the above said two pins of the IC. If it found Ok, surely the memory IC (IC003-M24C04-MN6T) is faulty. Replace the memory IC with same type and number. When you replace this IC, insist on same number, otherwise set won’t even refuse to switch ON. Check the oscillator crystal (X001) soldered to pin number 25 of the main system IC. Check the frequency at pin number 25. If it is found abnormal than specified, replace the oscillator crystal. Check the resistors connected to pins 37&38 [R003 & R032] respectively, for continuity. If all of these are OK, and still fault is there, check all the solder terminals of this main system control IC, for any dry solder, or loose solder.
Normally, a loose solder to IC terminals are very difficult to detect, as it will be very microscopic, as we cannot detect it without the help of a magnifying glass. The best practice is, to resolder all the soldering of this IC, by applying a little more solder, without making any solder short bridge in between adjacent solder terminals. You must have a concept of soldering, and steady hand to do this work. More important is the patience and concentration.
If you want the service manual to this set, contact me by email, if this set allows you to do so.
