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TVs

tv hitachi cdh-21 bus slin burning vertical.

circuitin
hace 5 años
hace 5 años
hello, this tv has the problem that burns the vertical, the peripheral components were changed and the trend was measured, it is 30v the integrated one is the la78041 and in the scheme it comes out that is 24v, those 30v come from the fli back, my Doubt is if the fly back is damaged x what gives that voltage.
eov47
eov47
665
hace 5 años

Hello, the tension + B that feeds the flyback, is it not exceeded? . Any defect in the coils gives less tension, never greater

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El LInce
El LInce
11.610
hace 5 años

Hi, it has a single voltage or a positive one and a negative one of the flyback is indicated the voltage for vertical integrated circuit power

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neg2013
neg2013
14.048
hace 5 años

Good afternoon: Apparently the chassis that carries the TV is the JYM-560, in the diagram it says that the vertical stage is fed with 28 volts; This chassis is to have that fault, it is always advisable to renew all the electrolytic capacitors of this stage, there are at least three filtering capacitors for those 28 volts, 1000µF for 35 volts. Keep in mind that they come to the market IC of poor quality, and also counterfeit ...

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nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello colleague: if it is JYM-560 chassis the tension for the vertical is 30v according to scheme ... check the elements marked on the image q, I embium ... check if it is the same chassis q, you have on your plate .. . https://ibb.co/n9Rctc
nicomena2015
nicomena2015
9.501
hace 5 años

if you have prob, of exceeded temperature, check if the vertical lc is tightly pressed against the heatsink ... you can lower the temperature a bit by changing the R406 from 1ohm x one to 2.2ohm or a Rde 3.3ohmx2w ... as long as it doesn't have prob. of yoke .... change the Cap, 304 of 100mfx35v and the C308 of 1000mfx35v ... check diode D301 1n4007 ... greetings !!

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circuitin
hace 5 años

hello, well the layerswitches were changed and the rest overflowed and now the integrated one is already damaged but it also does not open the image rebice the yoke and it gives me 6.5homios apparently it would not be damaged, I appreciate the help you have given me.

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nicomena2015
nicomena2015
9.501
hace 5 años

does not open the vertical lc or open very little ..? .. can you take a picture and upload it to see the fault ... check or measure the R304 of 1ohm ... it may be somewhat devalued ... or you weld an R 2.2ohm in parallel with the R304 and see if it opens the screen more ... you checked the C308 of 1000mfx35v ... greetings!

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circuitin
hace 5 años

hello, if the line is straight in the center of the screen, what they told me is iso but not yet open.

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nicomena2015
nicomena2015
9.501
hace 5 años

if it is a straight horizontal thin line in the center of the screen the vertical lc does not work ... x that now does not heat ... maybe the vertical lc is damaged ... try another (lc vertical) but before Turn on the TV switch to the R406 of 1ohm x another of 3.3ohm / 2w ... the R406 is at the output of pin9 of fli-bak ... comment if you understood the suggestion ...

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circuitin
hace 5 años

hello, it iso so it continues the same, the yoke reaches 26v and the integrated heats up a bit, apparently it works.

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nicomena2015
nicomena2015
9.501
hace 5 años

colleague: I do not understand your comment ... did you change the R406 ...? .. if you changed it, what value did you put ... the vertical is now walking ... fills the screen ... comments ..

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circuitin
hace 5 años

the problem persists, what I meant is that the yoke is good, in the vertical pins there are 26 v in all, and change r406 x the same.

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nicomena2015
nicomena2015
9.501
hace 5 años

let's see if I understand ... you say that, in the vertical there are 26v in all ... that means that, in all the pins of the vertical there are 26v ...? ... what of the R406 explain to you that, you will change it x another one of another value 3,3ohm ... not x another equal ... that change indicates you xq, with the R of 3,3ohm the voltage will go down q, it goes to the vertical lc ... this is only as it tests for see if the temperature of the vertical lc goes down ... it explains better what is that, there is 26v in all ...

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circuitin
hace 5 años

if friend there are 26v in the legs of the vertical and the yoke, also change r406 I put 3.3 ohm as you say and it does not open.

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nicomena2015
nicomena2015
9.501
hace 5 años

you do not specify well in q, pin there are 26v ... if it is in the legs 2y6 or in all the legs there are 26v ... the leg4 goes to mass look at that ... in the legs 1y7 there can be 2.5v ..
comment that ... only on pins 2 and 6 deven haver 26v ... ok ..

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circuitin
hace 5 años

if all the legs of the vertical opened 26v, but it was discovered that the problem was the integrated vertical that was failed the 3 that were found to be bad, another one was taken out of a chasisis and the tv works perfect, well grasisi for the help

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