Shunluo Inductance Power Inductor SWPA Series First Class Agent

Repairing a Hisense CRT TV model TF2919H, the main issue was a black screen with sound. The customer mentioned that there was no blur before the failure, so my first thought was it wasn’t related to the convergence circuit. I suspected the ABL circuit instead. After discussing the price range with the customer (not exceeding the budget), I brought the unit back to the store for further inspection.

During testing, the main voltage was 128V, which was normal. The audio line worked, and the filament was bright. The three-gun voltages were around 145V. Replacing the tube socket didn’t help, so I paused the repair. I then searched online for similar issues and found that some users had problems with zero voltage at the acceleration electrode. I decided to test it again and found that the acceleration voltage was indeed 0V. When I disconnected the tail plate, there was around 300-400V, which led me to check the following: 1) Was the capacitor at the acceleration electrode shorted? 2) Was the tube socket leaking due to moisture? 3) Was the picture tube faulty?

After eliminating the first two possibilities, I tested the picture tube and found that the resistance between the acceleration electrode and ground was zero. This confirmed the fault was in the picture tube. I tried using a 250V/10uF capacitor, grounding the negative terminal and touching the positive to the acceleration electrode. However, I wasn’t sure how to charge it safely, so I called the master for guidance. He explained the method: insert the new tube into the socket, ground the chassis, connect the meter to the acceleration electrode, short the filament pins to avoid damaging them, turn on the power, listen for the high-voltage sound, then turn it off, insert the probe into the high-voltage cap, and if the new tube glows briefly, it’s working. After this process, everything was normal. It was a success!

This experience reminded me of my younger brother who graduated from college 12 years ago. He started by following the master, later became a seller, and has been in the business for over 20 years. He learned a lot about appliance repair, from small appliances like rice cookers and induction cookers to large ones like washing machines, LCD TVs, and even water heaters. Since he sells his own products, he often handles repairs himself. If he can't fix it, he consults the master or checks forums online. The key is to provide good after-sales service, especially in smaller towns where trust is important.

Recently, I opened a store in another town to avoid conflicts with the master. Business has been slow this year, so I’ve been doing more repairs myself. While building my reputation, I also continue to learn. If I can’t fix something, I ask the master or look up information online. There are many experienced professionals on forums who can help. I often spend time on these platforms, reading maintenance guides and sharing experiences. Sometimes, when I feel down, I just browse the entertainment section and find comfort in knowing I’m not alone.

I wrote this article early in the morning to seek feedback from experienced technicians on whether my methods are correct. I also hope to offer some guidance to young repairers like me. When facing common issues, checking forums, listening to advice from seniors, and sharing your findings with beginners can be very helpful. Contributing to the community is rewarding and keeps the knowledge flowing. I believe that by giving back, we all grow together. I hope the forum continues to thrive and that life brings more care and joy.