TV Samsumg High voltage in + b
Measured resistors R817, RR821, R822 if they are good, you must change the tl431 and the optocoupler.
Ok, Your orientation is very correct. Make the suggested changes and the voltage now on the lamp in parallel with the C812 is 125vd. Connect the L804, I give it power and the flayback has a noise as if it were pressed, the vertical warms up a lot and the C403 of 250v x2.2u bulges it feels very hot, of course it does not open the screen. I did the following test. Disconnect the connector that goes to the yoke (Vertcal - Horizontal) the noise disappears (the white dot comes out in the center of the screen) but does not turn on the filament. That could be happening?
Ok, Your orientation is very correct. Make the suggested changes and the voltage now on the lamp in parallel with the C812 is 125vd. Connect the L804, I give it power and the flayback has a noise as if it were pressed, the vertical warms up a lot and the C403 of 250v x2.2u bulges it feels very hot, of course it does not open the screen. I did the following test. Disconnect the connector that goes to the yoke (Vertcal - Horizontal) the noise disappears (the white dot comes out in the center of the screen) but does not turn on the filament. That could be happening? If you have the digrama, thank you for downloading it
It seems that the fault comes from the Yoke, because when the flayback is disconnected, it sounds normal and the voltage at + b 125vdc. What do you think?. Thank you for your guidance.
you don't have to, disconnect the yoke ... the point in the center of the screen will be permanently marked ... measure on the C827 q, voltage has ... the 180v for the amplifiers, video in this scheme are in the C827 ... if it has no voltage of 180v and does not turn on the filaments it may q, do not start the hor stage, ... if it has noises in the fli-bak you should check the hor stage, and see if it does not have any component in short ... or the vertical stage in short ... check the R422 and R421 q, leave pin3 of fli-bak q, feed the filament and see if they are not open ... below I leave the file ..
https://www.med
here download the file ..
https://www.mediafire.com/file/8kn7114j6lihbzs/SAMSUNG_CL21M40MQ-_KS9C.pdf/file
I have reviewed the resistance indicated, which by the way in this chassis have a different value than the one you sent me and are fine, I extracted the vertical to test and the noise the same. Note that in the TV chassis the C403 is 250v x 2.2u and in the chassis that sent me it is 220u x 16v, the comment is because I have changed this filter three times because I only give power and at 4 seconds It explodes and I've checked that part near the filter and it looks good. Will you tell me? I appreciate your help. The noise of the flayback is like a finite but constant whistle.
the C403 in the chassis q, it is embedded in the hor stage, .. it has nothing to do with the 180v filter ... apparently there are no coinsidences what, I sent with its chassis ... apart in the Esuqema q, I sent the values are badly screen-printed ... look closely at where the 180v are and put there a Cde 10mfx250v ... I don't know where you say that q, when giving power the capacitor bursts you ... if in fli -bak has a high pitched sound, it may have some comp, in short ... check or remove the CR404 and see if the hor starts, without whistles ... the C403 in the scheme is wrong ... there I have to carry one of 2.2mfx250v. .. fix yourself on your plate,
I don't really know what your chassis is ... comment if the comp, q, are listed in the hor stage, in the scheme q, I sent you have chasms with your chassis ... if you do not have the 180v fence until the fli-bak and check the R 420 and see if it is not open ... search the network for the chassis q, correspond to its board ... do not follow the scheme q, send it because there are many errors of screenprints and resistance values ...
Ok, I am guided by the diagram or chassis KS9A which is quite similar, as for the 180v filter it has a 22u x250v, I found the R414 open, the whistle is still heard greater dflexion to turn on, the voltage at + b when giving power reaches 119v and falls to 100v. I will keep looking where I indicated and let you know. Thank you
ok, disconnect the CR404S, the whistle is removed, a small noise is left, the screen opens only one strip in the center, the 180v still does not reach and I see no light in the tube
Another question, do I place another capacitor or put it like that, regarding the CR404S
wait yet do not put anything ... as is the strip q, open in the center ... from left to right or arriva down ... that is the strip is hor, or vertical ...
the strip is horizontal, sometimes it opens in the lower part sometimes in the middle part, with fine colored lines around, about 3cm wide, and the bottom of the screen in general is dark
a question. C403 160v x 2.2u I could not replace it, the one on the TV made smoke. Will it have something to do? The reluctant feels and as it is on it disappears. I don't see light in the tube
the C403 has it, change a new one ... put one of 2.2mfx350v ... and take care of the original position ... you will not put it upside down ... also change the CR404S and CR405S x the same values originals .... do not put anything else ... do not open the vertical either ... measure if the supply voltages pin2 and 6 = 15v + ... pin4 = 15v -... the C403 should not be damaged or damaged. smoke ... check the CR406S and see if it is well welded ... if the hor strip, fill the screen from side to side check the vertical stage ... ok ..
Good night. Friend, we have taken a lot of pressure, the TV is already on well, change the CR402, which is 473 x250v to a 304 x 250v one, which I found in an equal chassis and in the same position and stopped heating the C403, no noise is heard, connect another one and return the fault and reconnect the CR404. Now what worries me is that the screen opens with a vertical strip, approximately 1 "wide on the right side, as if the screen were running to the left. The identification logos of the channels in the upper part come out half
I also want to thank you for the help provided (very successful). Thank you for continuing to guide me
I change the CR405S of 472x400v ... the CR404S of 680pfx2000v I change it ... the R414 of 15kohm is good ... measure it ... measure the zener Z402 of 5.6v and measure it if it is not leaking ... all these C and diode zener have q, see with the synchronization hor, and there are q, take care of the factory values ... lower the brightness and see if it is the image q, this run or is all the deflection hor, run to the left ... you can disconnect the antenna to see better if you still need that 1 "in, on the right side ...
Good. Sorry not to write to you before. I have made the suggested changes, the TV improved a little, the black band is still there, it catches my attention that when the TV is not connected to the cable, the screen is completely visible, the strip does not come out. Another thing., According to the diagram I have of the KS9A which is very similar, the TV brings in the C402S is 273 x650v and the diagram says that the C402S is 274 x 400v, as you did not get last place a C474 x 400v, the tv is good about everything, only that fault
Good. Sorry not to write to you before. I have made the suggested changes, the TV improved a little, the black band is still there, it catches my attention that when the TV is not connected to the cable, the screen is completely visible, the strip does not come out. Another thing., According to the diagram I have of the KS9A which is very similar, the TV brings in the C402S is 273 x650v and the diagram says that the C402S is 274 x 400v, as you did not get last place a C474 x 400v, the tv is good about everything, only that fault
Actually, it is the image that appears on the run ... it is not the deflection hor ... look at the R414 of 15kohm if it is in its value ... measure the diode DZ402 if it is at the value of 5.6v or it is leaking ... well, from the zener DZ402 the synchronization pulses hor, q, go to pin34 of lc 201S..ok
If the TV is already working well, do not forget to value my contributions as a solution ... I will still be aware of how your repair is going ... ok ... greetings !!
Friend before assessing its excellent orientation, I commented that I tried the TV with another card from another TV of the same chassis and the strip comes out the same. What do I measure about it?
buddy: look if the yoke has not moved something ... it has to be well attached to the tube layer ... some yokes bring small magnets on the sides of the yoke to stretch the image ... notice if it is not missing Some of that ... the rest of the TV looks good ...
I also wanted to tell you that this chassis of the other TV, which is identical to the TV that we are repairing, has CR403S 273x630v and CR406 = 304x250v, put them to the TV, but the failure of the same strip
good. look for the side of the yoke ... see if it is not diverted or removed from the bell of the tube ... as I told you notice if there is no missing magnet on the sides of the tube ... if we will not have to q, add capacity The stage hor, so that, broaden the hor a little, ... ok ..
Ok, friend, the magnets you mention, there are three that carry between the yoke and the screen, which look like rubber bands. In any case this TV does not have them, this TV came from another workshop.
if you cannot solve it from the yoke, do the test, look for a C of 1000pf x 1k6v or 2kv .. and connect it in parallel with the CR409S q, it is between the tsh collector and mass ... ok ... make no mistake value .... try a C of 1000PF x2000v ... then see results ... don't put another value ...