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Daewoo TV chassis CN-201A / B - Doubt regarding source

PostMortem
hace 5 años
hace 5 años
Greetings friends. I currently have in my workshop, a Daewoo Brand TV, CN-201A / B chassis, which came with the "dead" power source, and the TSH short. After correcting those details, when the TV is connected to the mains, the voltage in B + is 145V, and when turned on it drops to 124V. Both in the service manual, as in the screen printing of the board, it indicates that the voltage should be 123V, I checked all the components related to the source, both in the primary and in the secondary, and all the components are good, except a 47uf / 35v primary capacitor that was well below its value, but did not change the behavior of the source after replacing it. It should be noted that, the TV turns on well, does not present distortion in the geometry of the image, does not reheat the TSH or the vertical. My question is: Is that behavior of the power source normal in that specific chassis model? I appreciate your answers.
Victor E
Victor E
65.783
hace 5 años
hace 5 años
On that tv that voltage is normal in stand-by condition. It will not burn anything since the filters are 160 volts. Once the flyback starts and of course the TV, the voltage stabilizes at 123 volts . greetings
manolo karvalo
hace 5 años
hace 5 años
Hello Friend. Yes the tv. in the + b it measures 123volt. as indicated in the manual and does not heat the source or the tsh. and there is no deficiency in the image that singles the TV. It is already good, just test it for an hour if there is no change at all, it is ready. Cheers
nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello buddy: it may be normal in some sources the voltage of + b increases x lack of consumption at the source ... when the source goes to stand.by it works practically in vacuum ,,, there is no consumption from the hor stage,. and this is the reason q. the source increases its + b voltage somewhat ... but in your case there are no apparent problems .... given that when the power is lowered the voltage to its necessary voltage of 123-124v for its proper functioning .... it would not be normal if in stand-by the + b it goes beyond 160v ... ok ... since the filters in that line are for a maximum of 160v and consequently the filters would burst ... there are other more elaborate sources that, they maintain a constant voltage both in stand, by and in power ... if you have already changed some suspicious capacitors at source and the tv works fine ... everything is fine ... ok..happy!
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