good morning friends I bring this bug tv lg cn-20h10 cn-5aa so please can you help me as always thanks grateful with his contributions he throws me a white stripe in the center of the screen
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tv fail. LG Cinemaster, in the vertical stage. CN-20H10 CN-5AA
9.501
hace 5 años
hace 5 años
hello friend ... you have knowledge in tv repairs ... if you have it check the lc301-LA7837 vertical output ... and see if it reaches 24v to pins8 and 13 of the vertical lc ... and 9v to pin1 of the vertical lc ... check C313 of 1000mfx35v and see if it is not used up or damaged ... check the R311 and 302 of 3.3ohm and see if they are not open ... see if the yoke is properly connected to the plate. ... if all is well it can be that the vertical lc is damaged ... q, tension you have on pin12 of the vertical lc ... data collected from the NC-5AA chassis .... if you do not have knowledge on TRC repairs, do not Go hand and make it look for a qualified technician ... ok .... comment results ... greetings !!!
20
hace 5 años
ok friend thanks x answer but before checking out get me out of a doubt with the LG CN-20H10 NC-5AA / 5AD diagram the (diagram that I have NC-5AA) I do not know if they are the same diagrams example in the diagram indicates that the C306 it has 470/35 and the TV board the C306 has 33/160 and the c519 the diagram shows me 22 / 250v and the board has 4.7 / 250v the one that you indicate to me C313 1000 / 35V the resistance R311 is fine but the 302 I do not see the one that appears on the board is R315 3,3Ohm with respect to the c301-LA7837 on pin 8 and 13 0V and pin 1 11.8V and pin 12 0v I hope you can understand
9.501
hace 5 años
the diagram that I have is from goldstar-chassis NC-5AA -... I don't know if it will be the same one that you have in repair ... but the C306 is where the 24v for the vertical lc comes out ... it measures q, voltage you have in the C306 and if they go to the vertical lc ... the C519 can be 4.7mfx 250v or 10mfx250v or 22mfx250v ... in that there is no prob, ... the R315 I don't see it in this diagram ... R q. I mean they are the q, they are between the negative of the C313 and mass ... if 24v does not reach pin8 and 13 of the vertical lc check the FR315 of 2.2ohm q, it comes out of pin5 of the fli-bak ... it can be open ... change the C306 from 470mfx35v ... ok ..
20
hace 5 años
How about thanks if the diagram is different I have the same goldstar NC-5AA? if the resistance is open but the one it has is 1ohms but I change it and open it again and I don't get the diagram of this tv and the IC301LA7837 does not give me the V corresponding to those in the diagram and those that you indicate to me
9.501
hace 5 años
friend: if you replaced the FR315 ql feed the vertical and burned it again because you can have the vertical lc short ... try a new vertical lc taking some precautions for q, do not burn back ... when putting a new one tries to change the FR315 of 1ohm x one of 15ohm 2w ... it may q, open very little the vertical x the voltage drop on the R of 15omh ... if you see q. open a bit then change x an R of 10ohm and see if it opens more ... and so you try until you reach the 2.2ohm ... if you see that, do not open anything with the Rde 15ohm or 10ohm you can have a short on the yoke ... check that out ... ok ..
46.781
hace 5 años
hace 5 años
It may be a glow effect of the chamber, but because of the thickness of that line, it may only be a component outside its value or altered within the circuit, especially capacitors check the good condition of those components
Place with the values indicated in the diagram
Diagram here:
goldstar_nc-5aa.pdf [609.14kb]
goldstar_nc-5aa.pdf [609.14kb]
30.814
hace 5 años
hace 5 años
Hello Friend. that fault is in the vertical stage with that line is named horizontal line and to solve that fault you have to do the following, .. before changing the ic. vertical you have to change all new filters that are related to the ic. vertical, and change although the diode that feeds the ic is good. Vertical, if the fault persists, check the resistors that feed the diode, whether it is powered by the flayback or the choper. regards
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