The raster of the Sony KV-025MI TV is normal with snow dots, but there is interference.
Analysis and Maintenance: After powering on, the voltage at pin 11 of the CRT socket KG terminal is measured to be 135V, which is normal. After 5 seconds, it changes to 0V. Quickly measure the connection between R713 and L705 for 135V. After shutting down, check R713 (12kO) first, which is normal, indicating a short circuit in the green cathode, possibly due to contact with the filament. Upon inspection, a short circuit fault in the green cathode was found.
Handling Method: Place the TV upside down and gently tap the part of the picture tube near the filament with a wooden stick. Observe sparks inside the neck of the tube and continue tapping and vibrating until no more sparks are seen. Test the machine, and the fault is resolved. Contact Beijing Sony TV after-sales service phone number for further inquiries.
Technical data for Beijing Sony TV repair telephone services.