1. For the model Konka T2910A, after turning on, the image does not fully fill the screen vertically and horizontally, with black borders appearing around it. Analysis and inspection: This phenomenon indicates insufficient amplitude of the sawtooth wave current in the vertical deflection coil. Upon checking, the external circuit components connected to pin 31 of TA8659AN (VD301, RP303, RP305, R354, C321) were found to be normal. The feedback components connected to pin 32 were also good. Further inspection of the external components of the vertical output integrated block AN5521 revealed no abnormalities. It was determined that capacitor C29 was leaking.
**Solution:** Replacing C29 resolved the issue. Additionally, replacing N701 also resolved the fault.
**Source:** Beijing Konka TV Repair Phone Number [http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3761213](http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3761213).
2. For the model Konka T2910N, after turning on, the power indicator light is on, but there is no raster, no image, and no sound.
**Analysis and Inspection:** Based on the fault symptoms, when pin 8 of CPU N601 is at a high level, both +B (140V) and +30V voltages have no output, indicating that the device is not in a normal standby state. By disconnecting L915 and bridging a 100W bulb across +B (140V), upon turning on the machine, the two DC voltage groups were measured to be normal. It is estimated that the excessive current in the main load circuit of +B caused the protection circuit to activate, leading to V901 ceasing oscillation. The +28V and +16V voltages on the vertical output correction board come from the flyback pulses of the 5~7 winding and 5~6 winding of the line flyback transformer T402. If the correction board experiences a short circuit, it will affect the line output circuit. After reconnecting the +B line load and disconnecting R923 while inserting an ammeter in series, upon turning on the machine, a horizontal bright line appeared at the center of the screen, and the ammeter reading was 1.55A (normal value is 1.1A). Upon inspecting the vertical output integrated circuit, it was discovered that N701 (AN5521) was damaged.
**Solution:** Replacing N701 resolved the issue.
**Beijing Konka TV Repair Phone Number**