A Dead CRT TV Was Brought Back To Life. Model: Mieler ML21TV
According to the customer that brought this CRT TV set to my shop; it was working fine but the next day he tried to power it on, it did not.
The stand by light was on. That was an indication that the horizontal circuit and the power supply in both primary and secondary are in good working condition. To make sure all was well, I measured the voltages reaching the HOT, and I got 85 volts there. All the outputs in the secondary section of the power supply were there and stable.
From experience, this TV set should be working but for some reason, it was not. There was no remote control with this TV set and I could not find one for it.
The only thing that I could think of at this time was the EEPROM chip. Sometimes, when operating the TV from the main buttons, the program inside the EEPROM chip freezes and do not function any more. The answer to my problem was the remote control but since there was not remote control for it, I decided to do it the other way and hope it will work.
The EEPROM chip that I was dealing with in this problem was 24C08A. This is a common IC and it should be easy to replace and re program. I got one IC in my shop. I soldered it without reprogram it. I just want to see if the TV works or not. When I powered it, the TV worked and came on but only for a few seconds because the program found on that EEPROM was not the same as the TV’s.
Unfortunately, I do not have a programmer in my shop. I went to see another TV technician, also a friend of mine who has one. He down loaded the program on the new EEPROM. I installed it back on board and powered up the TV set. The TV worked just fine.
This was my first time I deal with this kind of problem. I had to ask a lot of questions and I got a lot of answers. Bottom line, I got the TV fixed and that what counts.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
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