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Tube TVs

TV model cr20sb72dm

Rivas medrano
hace 5 años
hace 5 años
Hello friends, I am new to the group and in the area of TV repair .. I have a TV, the brand I don't know which one it is, it has no labels with the brand name ... they brought it to me because I didn't turn on the pilot stand -by. I went from a single source to the source that is killed by a short transistor C4460 and the collector of this same transistor is connected a capacitor of 472 nF polyester is exploited ,,,, change the two elements and is exploiting the fuse .. Help .. and check the other elements and everything is fine .. I do not know what else could be the fault .. There are two resistance that distrusted them but can not be read for reasons that do not see their color because they are Very overheated ... help please.
manolo karvalo
hace 5 años

friend. What number is the tv chassis. to search the web.

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neg2013
neg2013
14.048
hace 5 años

Good afternoon, first of all before taking a source to the electrical network when there are components that we have found in short, you must use a way, some method, some technique that does not avoid this precisely, that makes us "fly" the fuse , I use a 200 Watts series lamp, now that incandescent lamps are not available, you must assemble a board with at least three 100 Watts lamps to use as a series.

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neg2013
neg2013
14.048
hace 5 años

The series lamp will simply absorb any short that we have missed, avoiding further damage to the source ... Second, if you do not know the model of the TV, look on the board for some kind of serial that allows us to search diagrams on the WEB , with the diagram in hand it is easier to be able to give directions and coordinate repair efforts ...

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neg2013
neg2013
14.048
hace 5 años

Check: Bridge rectifier, any other semiconductor, should not replace because yes and nothing more ... Open resistors will not cause the fuse to explode as you say ... You must still select the appropriate fuse ..

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Rivas medrano
hace 5 años

Thank you friend ... I will continue looking for more failure ... for something I will continue commenting

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Javier Chavez C
hace 5 años

Please indicate any series printed on one of the sides or sector of the main card that can serve as a reference for the search of the diagram

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Rivas medrano
hace 5 años

TV model is CR20SB72DM

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Javier Chavez C
hace 5 años

Will there be any other inscription on the main card?

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Rivas medrano
hace 5 años

No friend just that inscription I have the hand on the chassis has no more inscription ... With that model I look for it on the internet and I see almost identical font chassis

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Javier Chavez C
hace 5 años

Upload that source, it will serve as a reference. Thank you.

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Rivas medrano
hace 5 años

I will take a picture and I will surv .. thanks for your alluda

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manolo karvalo
hace 5 años
hace 5 años
Hello Friend. in addition to being the c4460 short, the ptc can also be short. That is why the fuse cuts off, so before changing those elements, check the rectifier diodes, and filters, and zener diodes. Cheers
Rivas medrano
hace 5 años

Friend already check all diodes.capasitore.recistensi.varistores. etc. But my question is if there is a short film in the secondary zone, could I have the same fault?

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manolo karvalo
hace 5 años

friend. if it can be possible that is why check the diodes, filters, which are after the choper and even the tsh. also if you have ripped the + b.

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Rivas medrano
hace 5 años

Look for the chassis numbering but you don't have it on the numbered plate

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Javier Chavez C
hace 5 años
hace 5 años
Until the B + voltage stabilizes, isolate or release the Flyback (FBT) to the source of its actual load, make sure that there is no short circuit in any of the auxiliary sources in the secondary of the chopper transformer. Install a filament bulb of a power equal to or less than the power of the TV as a provisional load of + B. Avoid checking the good condition of ALL the components in the primary stage of the chopper transformer. Generally the components that blow the input fuse are: Thermistor PTC, diode bridge its filter capacitor and the components installed in the positive line of said capacitor through the winding that reaches the collector of the oscillation transistor of the source. As suggested above, also use a series (150w / 200w) between the AC line input and the TV, to avoid futile sacrifices of components.
Javier Chavez C
hace 5 años

OKAY. We will be attentive to your progress.

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