Skyworth color TV model 29TK9000 (5P30 movement) rework machine with a burned-out line output transformer [BSC25-3355-21] and double focus feature. Users don't have this specific model in hand, so they tried replacing it with the Skyworth 29HI9000 line T. The original mounting feet are mostly the same, but the only difference is that the original uses a single focus while the replacement has a double convergence. It was confirmed that the tube seat can be replaced using double-convergence and single-focus settings, and after replacement, the focus can be slightly adjusted for better results.
This model has a common and annoying problem: the screen flickers depending on the image content, which can lead to misdiagnosis during repairs. The normal power supply voltage for this unit is 140V. If the voltage is stable, it's likely a data-related issue. However, adjustments made to the system do not resolve the problem. To enter the factory mode, press the volume key to 0 and then press the control screen. Another possible cause could be the pillow tube or a faulty capacitor.
After checking IC302 and C326, it was found that the real issue lies with C306 and D300. Upon testing, C306 showed no capacitance and needed to be replaced. Once replaced, everything functioned normally. However, it's crucial to use an authentic C306 capacitor. Using a counterfeit one may result in incorrect diagnosis and further complications.
Dongguan City Yuanyue Electronics Co.Ltd , https://www.yyeconn.com