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TVs

Vertical fault in TV. daewoo, Model DTQ-14V1SSFG

Alfredo Uzcategui
hace 5 años
hace 5 años
Good evening, dear colleagues, best regards, a TV arrived to my place. Daewoo brand, Model: DTQ-14V1FG, The fault I presented was black strips up and down, (Vertical fault) I did maintenance and started checking welds and components, which immediately observed the swollen filters, I replaced them, then I touched up cold welding, well, everything to the condition, the IC. LA78041 (Vertical) all right, ... Then I turned it on and there was perfect, but with a problem that does not give me a good Video, it looks rainy, check the tuner and has good voltage, I uncovered it and cleaned it, I put it New welding and it still looks rainy, I would like someone of you could guide me, give me a little advice to solve this problem, Thank you and many blessings, Thankful in advance from Valencia, Venezuela.
Rigoberto Mtz.
hace 5 años

ok I see that as taken as the starting point the agc pin of the turner that is good so we understand better as a routine it measures pins 3 (scl) and 4 (sda) should have approx 5v, the other voltages are correct

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manolo karvalo
hace 5 años

hello friend, if the volt condos They are very well look at the contacts that tuner has where you connect the signal cable that is closed and the signal cable is not making contact if they are open, close them. If this does not improve, you have to change the tuner to another one of the same number. regards

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ratonelect63
ratonelect63
5.308
hace 5 años
hace 5 años
internal welding in sinto ... antenna ok¿¿
Alfredo Uzcategui
hace 5 años

Good afternoon, brother, Thank you for your information, Yes, I'm going to check the Tuner's Internal Welds, Thank you for your information, Thankful.

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Alfredo Uzcategui
hace 5 años

Good evening RATONELECT63, you are greeted, I did the proper maintenance of internal welding and others that looked cold welds, more other touches and if, yes, it was the solution, it worked well, ... Thankful for your guidance, Thank you, Regards.

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Rigoberto Mtz.
hace 5 años

here they explain it better https://es.wikipedia.org/wiki/Frecuencia_intermedia

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Rigoberto Mtz.
hace 5 años
hace 5 años
friend, the tuning problem may be due to turner voltage failure, turner failure or IF line failure (SF101) that without counting the AGC line and adjustment. I recommend you inject IF or replace the turner with a reliable one, the turner and the SF101 are compatible with almost all TVs
Alfredo Uzcategui
hace 5 años

Good afternoon brother, I will check the points you just indicated, The Tuner will check the Voltages again to get out of doubt, AGC has 4.86V. - (MB) measures 4.92volts - Pin 7 measures 34 volts, I see them acceptable --- I will check the Line and adjust the AGC. Grateful, I informed you of the details of the repair, Grateful, Regards.

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Alfredo Uzcategui
hace 5 años

Good night Rigoberto Mtz. Thank you for your advice, I did intensive maintenance of the Turner, I corrected several Welds from the inside, also to the AGC circuit and even had cold welds in the Color Transistors, I solved all that area, I turned it on ... and everything came out Well, Failed Resolved ... Thank you Brother, very grateful, and the other thing was that I didn't know about the SF101 component. In itself, what is the function of that Component? I would like to know about him.

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Alfredo Uzcategui
hace 5 años

Good evening dear colleague, you are greeted, thanks for the information (Intermediate Frequency) on the WIKIPEDIA Link. Thank you.
Greetings and luck. God bless you.

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