20 inch TRC TV repaired
I went to my friend’s house for a visit and he asked me to take a look at his old TV which was not working properly. It was an old 20 inches TRC TV-VHF/UHF brand ELTEC Model CT-2021, Japan made TV.
He told me this TV set already worked for more than 20 years and this was the first time it had problem. My first thought was, if the ELTEC engineer knew about this they would be glad to have designed such a good TV.
As you can see from the above pictures it seems that there was a visual malfunction. The device was disarmed, an easy job; only some screws.
As you can see in the photos above there was a great amount of dust inside the equipment. The PCB was fully extracted for servicing.
The worst part I saw in the PCB was the circuitry around the STR50103 IC (Voltage Regulator) because there were many cold solder joints.
The IC was re-soldered together with all the corresponding components. The device was connected back into the AC-mains and when it was turned on, the picture was in perfect condition. The device was cleaned too with air pressure.
I gave him an advice to take out the rear plastic cover and put the TV set in the garden of his house to take a sun bath for some hours (it’s a traditional method in my country) Why? Because a lot of humidity was seen in the TRC and in the PCB too. Some people use Hair Dryer, but I prefer the sun bath: it’s a natural source of heat. Another old model saved from the dump.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
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