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TV Daewoo DTH-21S8RAV does not tune channels
Televisor Daewoo DTH-21S8RAV
Televisor Daewoo DTH-21S8RAV
9 Soluciones
26 Reparaciones
hace 5 años
hace 5 años
Good day, I have a Daewoo tv that initially had the strw6754 short, when I changed it, it turned on everything normally, I had it on for 4 days while the client arrived to bring it, but due to life circumstances when the client calls me to go to take it out, I try it again with the cable signal and unfortunately it does not tune me to any channel, I connect it with DVD and everything is fine, I solved the board in the whole area of the tuner, integrated, etc. I also measured the AGC voltages 4.8 vcd, 33 vcd, 5 vcd, all good. I changed the selector and it remains the same, I need your advice to be able to repair it.
Thank you very much in advance.
MODEL: DTH-21S8RAV
9.501
hace 5 años
Hello colleague: you tried to put it in automatic programming and see if it memorizes all the active channels ... you changed the option A / V or video x the cable option ... the changes that you make with the (c, remote) appear in the OSD ) ... when you start tuning to the channels, a rainy screen appears ... or nothing ... see if the inside of the cable makes good contact with the inside of the tuner ... greetings!
hace 5 años
Thank you very much friend, I tried to program it, I also made sure I had it in tv, cable option, and if rain appears when I remove the signal from the cable, I also changed the selector to one that works at 100, so there is no doubt about Make good contact with the terminal.
30.814
hace 5 años
hace 5 años
Hello Friend. since you have all the voltages biem on each pin of the tuner. Solve the tuner inside and make sure that the contacts you have at the entrance where you connect the signal cable are closed if the fault persists you have to change the tuner to another one that is the same or equal to the one you remove
2.308
hace 5 años
hace 5 años
companion. After doing the indicated, by the teacher Manolo Karvalo.- Options.- 1.- check the data bus in clock and date with a logical tip that has: high, low and pulse train. If you do not have a logic tip, then with an audio amplifier, you only place a 0.047uf capacitor in the input.- Option 2.- of a TV bn of those that have an input transformer (which is isolated from the network) Do the following: connect a black wire from the ground of the BN to the ground of your color TV, take a yellow wire and connect it to the "fi" of the BN, the other ends you connect a 0.047uf ceramic capacitor and connect it to the "fi" of your color tv (obviously you remove the original selector). you turn on the two tvs and what you tune in the bn you have to see in the color. regards. Felipe ascencio
9.501
hace 5 años
hace 5 años
hello buddy: as you have changed the tuner without results try the following ... measure if you get the following flights to the micro l701 ... pin-22-43-45-63-80 = 5v ... pins-9 -16-86-88 = 3.3v ... 3.3v leave regulator l803 and also go to eeprom pin 8 ... measure if they leave pin2 of reg, l803 3.3v .... measure if Do you have the 4.5v in the AGC of the tuner.?... also check the Z101 resolve it may be false contact ... the Z101 is x where the FI enters q, leaves the sinto ... passes x east (res, acoustic) and enter pin 28 and 29 of (lc71) ... comment results .... greetings !!
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