master gentlemen I just asked for help, I have this chassis tv mc-58A, it seems to be the same chassis of the lg goldstar, is 14 ", the problem is that the screen has brightness, has sound, on the screen you only see a few horizontal rays, just like old TVs when adjusting the vertical with a knob, I was suspecting the tuner change but still the same, is the one that goes the long tuner, I hope clues, from a thousand thanks.-
- I add more data, / in the tuner are the 33v 12v and 5v, - also when doing the channel search with the cable placed in the tuner, it is like tuning the channels, but does not memorize any, and remains in the channel 6 but in blue not green, and the image without video.-
Hello Gentlemen, this is how the image looks.
-I would like to know if flay can cause a failure like this.-
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master gentlemen I just asked for help, I have this chassis tv mc-58A, it seems to be the same chassis of the lg goldstar, is 14 ", the problem is that the screen has brightness, has sound, on the screen you only see a few horizontal rays, just like old TVs when adjusting the vertical with a knob, I was suspecting the tuner change but still the same, is the one that goes the long tuner, I hope clues, from a thousand thanks.-
- I add more data, / in the tuner are the 33v 12v and 5v, - also when doing the channel search with the cable placed in the tuner, it is like tuning the channels, but does not memorize any, and remains in the channel 6 but in blue not green, and the image without video.-
Hello Gentlemen, this is how the image looks.
-I would like to know if flay can cause a failure like this.-
TV series Dorada mod. 14d10, no image
163
hace 5 años
hace 5 años
master gentlemen I just asked for help, I have this chassis tv mc-58A, it seems to be the same chassis of the lg goldstar, is 14 ", the problem is that the screen has brightness, has sound, on the screen you only see a few horizontal rays, just like old TVs when adjusting the vertical with a knob, I was suspecting the tuner change but still the same, is the one that goes the long tuner, I hope clues, from a thousand thanks.-
- I add more data, / in the tuner are the 33v 12v and 5v, - also when doing the channel search with the cable placed in the tuner, it is like tuning the channels, but does not memorize any, and remains in the channel 6 but in blue not green, and the image without video.-
Hello Gentlemen, this is how the image looks.
-I would like to know if flay can cause a failure like this.-
22.858
hace 5 años
The tuner also processes the video for the air signal, after testing if it is seen by audio and video, if it is seen through those inputs, you must check all the tensions of the tuner, if they are well after replacing the tuner ,,, comment Your tests
22.858
hace 5 años
in the image it presents a loss of horizontal synchrony, check if it does not bring adjustment for the frequency either mechanically or by eprom, check or replace the x401 crystal.
163
hace 5 años
Hi, you can also see that the microphone does not detect video because when you leave the TV on with perfect audio, the 5-minute audio goes off by itself goes to standby.
46.781
hace 5 años
The working voltage on pin40 is somewhat low, did I change the C411? ... What voltage do you get at each end of the R409? At the other end you should measure 12v. .- If it is under the voltage of 12v, check the capacitors in that line including the IC804.
46.781
hace 5 años
hace 5 años
The problem centers on the synchronism separator circuit, CAF and horizontal synchronism including the horizontal driver transistor. Check the state of the X401 crystal for the voltage on pin40 of the IC501 and elements on the peripheral pins at the indicated stages in addition to the CAF pulse (AFC) coming out of the FBT
163
hace 5 años
hello teachers connect the dvd to the tv and the image is the same as the one that comes from the varicap, there is a wider band with some color.
- Pin 41 is the red color that goes to the trc's socket card.
46.781
hace 5 años
Follow the line of pin38 of IC501 and verify the good condition of the components and the continuity of their connection tracks on their way to pin10 (AFC) of the flyback. (C409, R404, D402, D403 and R416)
163
hace 5 años
Hi Javier, the components are fine, and on pin 38 of ic 501, 6.4v arrives, change the ic501 jungle, and there is no positive reaction, it remains the same, this fault is very rare.-
46.781
hace 5 años
Is there continuity between pin7, pin4 and pin10 of the flyback? .... what voltage is obtained in the alternating current range on pin 10 of the flyback .... In these critical cases it is recommended to renew components suspected of doubtful appearance at the stage being worked.
163
hace 5 años
hello if sir there is continuity between pins 4, 7 and 10, pin 7 is isolated s / c, I have a chassis that is working change the mic, donating from this, but the fault is perceived.- change the eprom and nothing.-
46.781
hace 5 años
The working voltage on pin40 is somewhat low, did I change the C411? ... What voltage do you get at each end of the R409? At the other end you should measure 12v.
163
hace 5 años
Hi Javier, well I discard the flay, change the flay and there is no case that it works, I change the jungle, micro, tuned, the ic behind the tuner, eprom and the light brown 3-pin z501, is very rebel.-
hace 5 años
Hi Tuscan, you said you changed the z501 crystal, but you don't say if you changed the X401 crystal to pin 37 of the jungle, you also don't say if you changed electrolytic c542 (2.2uf 16v9) to pin 33, the c411 (100uF 16v) to pin 40 and the horizontal driver transistor Q401 (C2328).), also c408 (3.3uF 16v) to pin 36 (AFC) and all the components of this line.
46.781
hace 5 años
Having fully reviewed the work components on the periphery of the IC in the section involved (Sync, AFC, Horz driver) and having changed those of doubtful appearance. Go to the horizontal driver stage and check the good condition of its components including the driver.de transformer. If the problem persists, also check the tuning capacitors (Those installed in the TSH collector line).
163
hace 5 años
Well, holy masters, I commented that I have already exhausted from changing components on this TV, isolate the first r that is starting from the afc pin of the fly, and turn on the TV to see what was happening, I remain a while without brightness I lifted the screen immediately left blue the screen immediately unplugged, I said well it was more complicated, I connect the situation, I turn on the TV miracle perfect image, turned off several times, and working fine, later I will try again, because I am not believing, - tomorrow I tell you as follows , good night, good rest and may God always take care of you.-
163
hace 5 años
Hello good morning gentlemen, the TV is working, from now on thanks for the supply of clues and God protect them.-
hace 5 años
hace 5 años
Tuscan, in ic 501 (TA8808BN) pin 33 (SYNC SEP) reviews welding and checks elements of this line: electolitico.c542 (2,2uF 50v), capacitor c541 (680p), r542 (120) etc. It also reviews welds of ic 201 TA8822 behind the tuner.
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