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Tube TVs

TV Daewoo DTQ14 inch does not turn on

alain
alain
132
hace 5 años
hace 5 años
I have a 14 inch daewoo tv with micro la8680 is powered with 8v on pin 26 of the mic when I turn on the tv, the b + with 125v In the horizontal oscillation output I have 2.1v of the micro when I disconnect the fly and the horizontal output ,, if I connect it it drops to 0v and the TV does not start already change micro, fly, horizontal output, transistror drive and nothing ,,,, lo What caused the break was a jump in the fly apparently because of what the customer exiled me and I have no data from the TV if you can help me
felipe  antonio
hace 5 años

Suggestions.- 1.- you remove the flyback and the hot, you place a charge of the b + to ground (a focus of 75w) .- with this you will check the source .-- 2.- connect your frequency meter at the base of the hot, you give on and check the frequency 15750 cycles. with this you will have the certainty of the operation of the source, if the jungle oscillates and if it reaches the base of the hot. comment. regards.

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nicomena2015
nicomena2015
9.501
hace 5 años

You have to put model and chassis number to see the circuit and give any suggestions ... greetings!

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alain
alain
132
hace 5 años

I have no focus of 75w only a multimeter fluke and the voltage b + does not fall with the fly what falls is the oscillation the source works ok but I do not know if it is a problem of any power of the micro la8680 or the tmp47c43n I have no plane of anything and what I could check was that the metal quartz of the la8680 has 0.7v and that must be to that integrated circuit only 8v arrive from the source

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alain
alain
132
hace 5 años

I only have one photo here the chassis I have it at home but I don't know how to send you the photo of the board

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felipe  antonio
hace 5 años

Check the frequency.- and to send the photo: mark the "landscape". you select file .--- mark the photo and give it open .--- send to server ---- accept --- send. and voila. !! .- The reason why the oscillation "falls", is due to failure of the horizonal output, flyback, vertical ci, "dry" or devalued filters. - It is important that you check the frequency and take to test The flyback regards.

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nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello: see if the voltage also drops on pin26 = 9v and pin48 = 9v ... the output of the hor excitation comes out of pin23 of the TA8680N micro jungle ... if the excitation falls on pin23, it may be , have some short in the hor, or vertical stage ... all the diodes in the hor, and vertical stage must be measured ... in direct and inverse and see if there are none in short or leaking ... the tension del + b is 123v at C802-C801 ... when there is an AT leak in the fli-bak ... you can put short -diodes-lc vertical etc etc ... you have to check all the components in the plate ... can also act some protection q, I do not see x now in the very choppy scheme ... greetings!

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