Tv daewo No voltages in the secondary
You already changed C890 and D809 .... how long is R890 R809 R895 ... comment ....
Willboy friend if I already change those parts mentioned ... what else do you suggest? I doubt the chooper ..
This is what you say ...
tv daewo 14 pul. Chassis cn-001G ...
No voltages in the secondary (try the source with a spotlight) .. you are sure that not even 1V appears in any secondary line ..
I only have voltage on the 167V fat filter (how much is your AC 110VAC or 220VAC line)
+ b I have ov .... (does not appear even if it is 1V in standby)
Things he did
Midio TSH alright ...
Change twice the STR ..
Pin 5 of the STR voltage from 9v to 17v bone fluctuates ..
Change fat filter, precision resistors such as R869 R868 R894, change some capacitors and r805.
If friend willboy the tsh also change it and if it is correct I don't have even 1v in + b anything like I do the focus test friend?
Albert and check the r809 change the filter c890 eh not changed the tl431 because I have no other ...
Hello colleague: ... I also join the good contributions of colleagues ... if you have the (str-w6735) you must measure on pin 4 if the starting voltage coming from the line voltage across the line arrives R809 from 180kohm ... also as you try
Remove Q402 from the circuit, salt, hor, ... and see if voltage appears in C814 .. + b..133v ... check or measure the D807 if it is in good condition ... measure the L807 if it is not open. ... on the primary side check diodes D804-811-812 -... C893 and 890 change ... check with ohmmeter C815-812-817- if there is no short with relation to secondary mass .... comment. ...Cheers!!
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I must comment that the str that this 6-pin TV is not 7, like the one in the diagram and the only voltage it gives me is in its pin 3 which is 9 to 17v fluctuates rises and falls, it is in pin 3 and in the 4 fluctuates also a small voltage but does not reach even 1 volt ....
Nothing friend already remove the tsh and the voltage does not return change everything you tell me and nothing just keeps fluctuating that voltage in the str pin does not stabilize ... what else do friends suggest ?? How do I do a test to find out if it's the chooper?
Friend if it is 7 pins, only that pin 2 does not bring it ... 1 3 4 5 6 7 is counted ... and if you checked the diodes and resistors and there is nothing wrong, I advise you to try another STR, now that this one is not oscillating, it is the only explanation that remains for me, since you have 0V in secondary, 167 in fat filter and in pin4 variable voltage ... try another ... but check it well ... because the nonesta source oscillating ...
Willboy friend ok you already clarified the doubt about the pins of the str ... now what happens is that it is already the second str that changed ... the first one I had did not fluctuate ... the second that I put that is the who has a current equal friend ... and asked several times will not be the chooper transformer? How do I measure it if it's not broken ...? The same voltage that fluctuates in the str is reflected in the octocoupler and later in transistors ...
In the transistor HA 431 4CC6 in the str the voltage fluctuates from 9v to 17v in the optocoupler pins as well and in the next 2 pins of the flute optocoupler a voltage of 9v goes up and down just like in that line where the transistor goes to you I say HA 431 ... I also suspect him but I did not get an equal one or another replacement ...
Hi --- the HA 431 is a precision regulator IS NOT A COMMON TRANSISTOR
Some of its replacements are TL 431 ---- KIA 431 - LM431 - Etc Etc always have the same final ending 431 and the first letters are according to the manufacturer ---------------- I suggested almost from the beginning of the topic that you change the - optocoupler --- and the HA 431 and you have not mentioned having done it again I suggest you do it because it will take us away from doubts are not expensive and comment the results I hope you answer - ---------- Albert
Hi Albert ... I have problems with 2 TVs here ... I do not find capacitors in the market of 1500uF / 50V, nor of higher voltage and they do not fit in the TV card in parallel ... which I can put for that works to cord ... are in the secondary exit .... not found the chassis CH4B-1 .... is a 21-inch selectron tv ...
Here the post ...
http://yoreparo.com/tv/televisores/preguntas/5730328/cual-puedo-poner-que-no-hay-en-el-mercado#post5730332
Here is another problem with another TV ...
http://yoreparo.com/tv/televisores/preguntas/5729904/tv-jvc-modelo-c-n14010-no-enciende#post5730035
colleague: ... the TL431 is in (zener programble) and to prove it you need several things (source) - (potentiometer) -etc etc ... it is easier to buy a new one ... (cost coins) and get out of doubt with respect to that component ... in any electronic house they should have it ... or if you do not find it on any obsolete platelet ... if or if you should change it..ok..and see results..ok
Cheers!!!
Thanks friend for your suggestions .... what happens is that I have the TV and waiting for those parts to arrive along with the new str .. the tl431 and the shooper .... then I thank you all and greetings. ...
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