Samsung digital King TDX-328B satellite TV set-top box repair notes

Samsung digital King TDX-328B satellite TV set-top box repair notes

Author: idle

Blog: http://blog.csdn.net/cg_ I

Time:
Thursday

 

Statement:

I am neither an electronic specialist nor an electronic enthusiast. I just accumulated a little superficial electronic knowledge in my daily life. Personal happiness research, good hands-on everything you love will go deep into it, entertaining yourself, a wide range of but not refined.

The reason for the success of this repair experience is summarized as follows: 1. Samsung digital King TDX-328B satellite TV set-top box (hereinafter referred toSet-top boxWorks are well-regulated, the circuit design is reasonable and scientific, and the circuit board logo and original model are clear (it is very important to facilitate searching for the original information in the future ). 2. Thanks to the "Air Switch", which has been quietly working at home without any regrets, you have detected circuit connections in the first time (after the fault of the second-level tube in the inside of the set-top box is rectified, it leads) quickly disconnected the power supply, to avoid the possibility of serious damage to the internal circuit of the set-top box, but also to protect the safety of other appliances in the home. The "Switch" that is loyal to your duties and gives you nothing to return is the most affectionate gratitude.

The following is my picture in the repair process. The process is very simple and I will not elaborate on it in detail. I don't want to publish it, but considering that there are more and more kinds of electrical appliances around us in daily life, and there are countless electronic originals in the electrical appliances, the electronic level is constantly evolving, various original devices are becoming more and more stable, and circuit design is becoming more and more scientific and secure. Some household appliances are often accidentally damaged, but they are not very serious faults. Most of these minor faults will first damage the power supply devices in the appliance. We can fix them with a little help, from time to time, it is another kind of performance that advocates "diligence and thrift" for the country. What's more, it is still in the "international financial crisis.

 

Body:

Fault performance:In normal use, the fire is suddenly ignited, accompanied by sound, and the smell caused by the burning of electronic originals. Mains interruption during power switch trip at home.

 

 

(Figure 1: set-top box exterior)

 

 

(Figure 2: Inside the set-top box)

 

 

(Figure 3: wire burned out)

 

 

(Figure 4: visual inspection of the power circuit board without obvious damage)

 

(Figure 5: Protection of Thermistor)

 

 

(Figure 6: test the second-level Tube)

 

 

(Figure 7: Two-Level Tube feature 1: forward conduction)

 

(Figure 7A: Forward reading data)

 

(Figure 8: second-level Tube Feature 2: Infinite reverse resistance)

 

 

(Figure 8a: Reading 1 indicates the value is out of the range)

Repair Process:After repeatedly testing all the second-level tubes in the circuit board through the above method, it is found that four in4007 rectification second-level tubes in parallel at the mains input position (AC and Swatch switch) are all broken down, which is also caused by (figure 3) as shown in the direct cause of the wire burned, because the wire overload is burned out, coupled with the "Air Switch" in the home quickly disconnected, so that the electronic original in the circuit board is not further seriously damaged, it also brings convenience for subsequent repairs (you can directly replace four in4007 second-level tubes ).

 

 

(Figure 9: remove the damaged device)

 

 

(Figure 10: remove the same model from the original bad power circuit board)

 

(Figure 10a: After replacement)

 

 

(Figure 11: Self-made wires)

 

(Figure 12: power-on testing is normal)

So far, Samsung digital King TDX-328B satellite TV set-top box repair completed.