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TVs

Tv LG CHASSIS MC-059A DOES NOT TURN ON

HectorM
hace 6 años
hace 6 años
Good morning dear colleagues of yoreparo, I have a problem with the MC-059A chassis which I get with the following failure to check the voltage of + B this was short, which led me to isolate the line and I found that the Q402 (TT2170) was damaged, I proceeded to replace it, just like the capacitors of the + B line, the C814 (160V. 220MF) and the C822 (160V. 47MF), at this point the strange thing begins once the capacitors have been replaced before After installing the Q402 I prepared to measure the voltage of + B which gave me 110VOL, but when I installed the Q402 (TT2222 REPLACEMENT) it turned on a few seconds and then this voltage dropped to zero, the TV is playing (tic, tic, tic) coming from the re-lay, raise the collector pin Q402 and the voltage again stabilized, I measured the Q402 and it is in good condition raise the Q16 and nothing still remains the same. I need your collaboration.
nicomena2015
nicomena2015
9.501
hace 6 años
hace 6 años
Hello colleague: ... you have to check the fli-bak and associated components and see if some of these are not short ... raise a leg of the L802 and instead connect a 60-75w filament lamp to avoid some short of the fli-bak .... then you give power and see results ... you have to, ensure that, tsh is in good condition ... the tic tic of the relay only connects the demagnetizing coil ... remove the ptc of the plate to work on the plate ... check the C803 of 220mfx400v in the primary and see if it is not used up ... if you follow the prob, remove the Q402 salt-hor- and test the source with a simulated load ... you can use the lamp of 60-w above ... and connected between the positive of the C814-835 and ground ... and see if the + b is regulated in the 110v ... first you must see if the source regulates well or falls to 0v with simulated load ... then we see the protections ... have the fli-bak checked ...
HectorM
hace 6 años

Hello colleague Nicomena2015, I start to exercise your recommendations and I comment sorry for the delay but I have internet connection problems

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HectorM
hace 6 años

Good morning, colleague, indeed, the problem came from the flyback that is in short, I am grateful for your help, helping me orienting myself in the cause of the failure.

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