daewoo tv model DTQ-14VSS, chassis CN-001G. does not turn on stamby le
hello nicomena thank you for responding I tell you that there is no secondary voltage the steps that you tell me to follow and I have done them. disconnect the + b from the flayback and ths it is good to disconnect all the diodes of the secondary and nothing does not turn on stmby LED I have measured all the transistors that make up the regulation and are also fine zener diodes and others I have put another optocoupler and nothing the resistance of. 33 this good change str and nothing, I think I clearly have a problem at the source, remove the str and where pin 4 goes only 60v stable arrive
Hello colleague: you can not disconnect all the diodes of the secondary xq, in that case the source will not have regulation ... nor do I think that, start ... you have to have everything connected to their respective filters ... do not forget that , this source is regulated from the secondary through the l803 (zener prog,) and the optocoupler l805 ... if there is any overload or short the source will not start ... after checking the four lines of tensions q, leave the chopper if there is no short film ... that is easy ... with the tv off tester on scale (xdiodes) black tip to the mass of the tuner ..
red tip on all the cathodes of the diodes q, leave the chopper ... I should not show resistance on the display ... if in any cathode or positive of the filters q, leave the chopper mark almost 000 on the display or the There is a short tester ... you also have to measure if there is tension in pin1 of str-w6735 ... it is rare that there is almost everything changed and there is no voltage in + bo C814 ... this tv has two protections ... the OCP in charge of R814 and Q804 ... (protection x on consumption) ... and the other leaves the heater is filtered and attenuated with R451 and 452 and goes to the base of Q703 and then to pin9-x -ray ...
Thanks nicomena for the contributions you give me, I want to comment that the dirt track that passes through the flayback and then goes to the connector that goes to the trc c clearly sees that it is burned is interrupted. and I repeat I only have 18 to 20 volts in pin 4 of the str how much voltage should I have in that pin that is the vcc of str. tomorrow I still work on the TV and I thank you
It is rare that q, the mass track of the secondary pin7 of the fli-bak q, goes to the trc (cathode ray tube) is burned to the point of swing ... the trc does not handle so much intention to lift a hint ... tsh pulses if they handle pulses of more than 1000v and can open a weld but these do not go to trc ... they are generated inside the fli-bak and are derived to the yoke for deflection hor ... you should do check the fli.bak and also the tube ... on pin 4 of the str there can be about 18v .. you must repair the source first .. I explained it to you in my first com
well but the str q, you changed it was in good condition ... you measured if voltage arrives at pin 1 of the str ... if voltage arrives at pin 1 of the str and does not start it may be damaged or if you still have some short in the secondary ... you have to check all the diodes and capacitors that are associated with the str ... the L811 has continuity ... if you have no voltage in the secondary there will be no starting pulse from pin 11 of the lc701 ... try a new str ... but when it comes to q, an electric shock entered x the electrical network can cause great damage to the components ...
good friend; but do not comment if the voltage reaches pin one of the str ... to pin 1 of the str has q, reach the voltage that comes out of the C804..300v or 165v according to the voltage of the electrical network q, have ... just comment that, you have 18v on pin4 ... but you have to measure if the voltage is on pin1 ... if there is no voltage on pin1 it will never start the str ... ok ..
good afternoon companions excuse my absence nicomena I tell you there is no voltage to pin 1 of str w6735 even with the str out of the board. I clearly believe that the jungle suffered damage with the electric shock. The pin 44 and 47 of the jungle gives me continuity with the selector or secondary negative housing, and these pins are powered by the Q801 which I told you was burned. My conclusion is that the jumgla is damaged that you think your
colleague: put the negative of the black tip tester to the sitonizer shell put it on a scale (xdiode) ... then put the red tip on pin 44 and then 47 ... do not knock the tester or give resistance values on the display ... when inverting the tips if it will give resistance value between 470 and 600ohm ... but if it gives equal value in both directions if it would be short ... there is q, measure the same measurement in Q801 in C816 .. .other ... if pin 1 of the str has no voltage, check the L811 ... it may be open ... if it has voltage on the C804 it has q, the pin 1 of the str ... has the same voltage, explain it above .
colleague the tests that you tell me have already been carried out with complete certainty I tell you that it continues continuously between pin 44 and 47 giving or marking infinity in function of diode and whistle of my tester placing the tips in vice versa. The q801 gives the same measurements being mounted on the board. It should be noted that said transistor was already replaced it should not be marked so what I do not understand is because I do not have V on pin 1 of the str6735 is finding the L811 coil in good condition. Go to pin 1 even without the str off the board. It is tremendous to think that the T chooper is a broken thing that has never happened to me
friend: we do not understand each other ... pin 44 and 47 you must measure them in relation to mass ... first one and then the other ... if in a way it marks you imfinite and when you tip the tips the voltmeter whistles you are not in short ... if the voltmeter whistles you going the tips if they can be short ... it seems very strange that you have those pins short ... here I leave a picture of the source ... where indicated by voltmeter ( xdiodes) if there is continuity between pins 4 and 2 ... you should whistle the tester ... give it a solved ... https: //ibb.co/cfDNnn
Good evening, colleague, thank you for the image. I commented that today there were positive advances on TV. the chopper transformer was bad, replace it and the voltages 134 + b return the 45v that go to the tranf draiver, but in the + 18v I have 9v. and in the + 13v I have 6v bone they are very low, and the 5v of stamby are not .... referring to pin 47 of the jungle I tell you that it gives me continuous and if it sounds my tester putting + in mass and negative to pin 47 and in the same way if I invert the tips, the same happens with pin 44. I did not say colleague I have tried them separately
good friend: according to your comments you changed the chopper and the 133v of the + b appeared ... but the prob, of which, you have under the 18v must be ... xq, the Q801 is short ... or the prob, of pins 44 and 47, they are short ... do not forget that, since pin 47 has q, output a voltage of 8.7v q, activate the Q801 for q, deliver 8v to pin44 ... but as they are in short the voltage is falling ... the voltage of 18v also goes to the Q701 q, delivers the 5v to the lc701 ... the 13v goes to the audio ... if the lc101 has pins 44 and 47 in short you will have to change the micro ...
fellow nicomena I am very grateful for all the guidance and successful contributions you gave me. The TV owner loves this TV very much he will have his personal reasons. He wants to have this tv running and active. For my part I am going to try to find the ic 101´I will not close the post when I mount the ic comment and again thanks
good afternoon companion nicomena after so much time I told you that I found the mike and went on to mount it and with the great saturation that the TV started with some vertical problems that I already solved it and the tv is working very well. Very grateful for the help and knowledge provided in this repair
Hello colleague David: I'm glad that you already have the TV working well ... from my side "congratulations" now I would like to give you a (best answer) under my first comment in this way it is in the file of solutions as it was repaired said failure ... luck .. greetings !!