Nesesito diagram tv.samsung model TX-R2728G CHASSIS KS7B
hello colleague: if you have a pc click on the link of blue letters and then click on the green box of mediafire and you can download the file ... you have to have the adove reader on the pc .... comment if now you can download it ... ok ...
Hello friend many thanks for your contribution.
I tell him that I don't have the pc. And I could not download anything however I got a plate that is the same chassis ks7b replace the regulator of the WG750 source and the TV turns normal after 5 or 10 minutes it turns off and checks voltages and everything is normal to support me?
It is the same chassis .... I check if the 130v in C821 of 330mfx200v are maintained ... I take a temperature in the TSH and see that it does not overheat ... measure on pin 36 of the lcv201 ... and see what tension you have when it is working and when it goes off ... take a temperature in the vertical lc and see if it does not overheat beyond normal ... the source regulator overheats or not ... take a temperature on the lc804 and measure if the 5v goes well x pin2 ... also check the reg, Q808 of 5v and Q809 reg, of 3.3v ... see if it turns off if the filaments are still on ...
Good morning mate, greet the distance.
I tell you that I did everything I indicated in the C821 330mf x 250v 100v remain in the THS the temperature is normal in pin 36 of ICV 201 meeting 3v and 0 when the vertical LA78045 is turned off it warms up a little more in the ic804 voltages the same in reg.Q808 and Q809 and when turned off there are no filaments.
Thanks for your help.
Hi. in C821 the tension when giving power must be 130v ... you say that there are 100v ... you must measure when the TV starts and see what tension you have in C821 and if this vote reaches fli-bak ... when the TV is turned off, see if maybe the filament is only turned off ... that can be verified when the TV is turned off, measure in the C412 if there are 180v for the amplif, video ... review welds on the pins of the fli -bak ... there may be welds that fail to take temperature and open ... ok ..
Good afternoon my friend and colleague plaser to greet you, I am thankful for your time and contributions.
Solve a large part of the plate, if there are 130v in the c821 and if they reach the flibak after 10 minutes it always turns off completely not only the filament, but I think it is the regulator that is not of the same chassis that I am repairing (ks7b) the one that replaces is the wg75040 and I am not sure if this is the one that takes.
I happen to believe that it is the regulator that is bothering you.
hello buddy ... notice when it turns off full x if it also runs out if i tension the + b ... if it also runs out of 130v q, go to the fli-bak ... it's already prob, from the source ... confirm suggested ...
Good day when it is turned off, 115v remain after one minute the second relay is triggered and 100v remain in the b + in elc821 in the orizontal and 75v the large filtron of the source
colleague; refers to the C803 of 470mfx450v .... if it is that capacitor the voltage must remain at 165v if it has 110acv in the electrical network ... and 300dcv if it has 220acv in the electrical network ... but it cannot have 75v ... if that were the case, check the diode bridge D801s and the nt801 and see if they are in good condition ... check the general ignition key and see if your internal contacts are not failing ... measure at the ends of the CX802S if the mains voltage is present ... review welds in the ignition key and in all that area ... check the equipment plug ...
Good morning my dear that you succeed in your work.
I comment that the TV that we are checking the chassis number is KS7B and the C803 that it carries is 250v x 470mf and the c821 is 160v x 220mf. Already solve the entire area of the fountain and the cannon plate, the only one that heats a lot is the LA78045. I would like to embed images along this line but I think you can't.
Thanks for your time I have interest friend.
There is something else when it goes off (after 10 minutes) a thunder is heard in the speakers.
on the page q, figure below you can embed images in these comment space .... tovavia it is not clear xq, in the C803 the voltage drops to 75v as you have commented ... with this voltage of 75v the tv cannot work ... in the C803 can not lower the voltage ... must remain in the 165v even when the TV is turned off ,,, x that reason explains everything q. you have to check the source primary ... below page to embed images ... check audio lc ... measure voltage on pins 2y6 and 4 of the vertical lc
https://es.imgbb.com/
Good afternoon, colleague plaser of greeting you, I apologize for the absence, I commented that my problem continues with the TV. From so much being tested, I am left with delay lines, the little circuit that went on the TDA6109JF tank insert no longer heats up as if it is not working voltage that reaches 11v dc 25 ac. I think I'll deliver it that way. In the same way I am grateful to him for all his co-operation and his fatty time
maybe you are missing the voltage of the 180v q, leave the C412 of 22mfx250v ... measure in the positive of the C412 if you have the 180v ... if you do not have them check the R450 of 0.27ohm and see if it is not open or burned .... if it is open replace it with one of 1ohm 2w ... measure if it has 180v on pin6 of tda 6109jf ... if it does not have that voltage on pin6 ... also check the L503 in the socket of the tube and see if it is not open ... ok ..
Hello colleague: thank you for greeting me on this day ... equally for you and family on Mother's Day ... from the south of Argentina (congratulations) on this day ... greetings !!!!!!!!!!