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Tube TVs

TV Tonomac TO-4-14-SLIM-B does not turn on and is protected

AdrianMV994
hace 5 años
hace 5 años
Good colleagues I have a question for you, in the workshop I have a TV Brand Tonomac Model TO-4-14-SLIM-B and Chassis PSW14UT , the problem is that the TV is protected by turning it on, I measured the secondary voltages and the only one missing is the so-called 5v-2 that comes from the N556 controller, the rest of the voltages are OK, it is but I briefly have the voltage of 5V-2 (at least 2 seconds until the source is protected). I checked the voltage input (PIN1) of the N556 and I see that it has a short voltage input (the 8V supplied by the transistor collector V571 and then the transistor stops emitting voltage, but the transmitter always has the 8V). I appreciate any help colleagues, since I am not familiar with this chassis.
miguel 86
miguel 86
2.160
hace 5 años
hace 5 años
Good, do not comment if you changed electrolytic, if you did not change all of the secondary after the choper, small and large, this model fail the boys much more, try changing, greetings
nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello colleague: one more suggestion ... according to chassis PX20172 .. the V571 is a trans, PNP and must receive at its base a negative polarization for q, this transfers the voltage q, there is in its emitter towards its collector and then to pin1 of the reg, N556 ... this action is produced by the V591 when it receives at its base a positive ON-OF voltage .. coming from pin65 of N301 .... but if this voltage is cut from pin65 of lc N301 it is also cut the polarization in the V571 running out of tension the collector of the V571 and the reg, N556 .... for some reason the TV is being protected .. check the source if it regulates in its correct voltage + b ... remove V461 salt-hor - and connect a 60-75w lamp between the positive of the C532 and ground ... then measure voltage of + by and see results .... change the C532 of 220mfx160v ... check stage hor,. in the diagram the + b voltage ... may be printed on the board ... greetings !!
AdrianMV994
hace 5 años

I measured each electrolytic of the secondary with a capacimeter and it gave me that it was OK, I am not changing anything else the components, but at the suggestion of the colleagues I replaced the capacitors C552, C572, C556, C468 and C582 and the TV started and it was OK , I emphasize again that when measuring each capacitor replaced with a capacitor they gave me OK results. Thanks for the help.!

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Victor E
Victor E
65.783
hace 5 años

So when changing the c552 and c572 as I said I started the tv.thanks for valuing my answer.

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miguel 86
miguel 86
2.160
hace 5 años

It's good that he solved, that's how he learns.

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Victor E
Victor E
65.783
hace 5 años

Yes, you must learn to value also haha. Greetings Miguel.

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luis tartaglia
hace 5 años

The solution was given by colleague Victor.

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Meygil2017tecnico
hace 5 años

Both Miguel and Victor came up with the problem .... hahaha but hey .... again nicomena hahaha ... well greetings colleague nicomena ... and a greeting Cordia pra my friends colleagues Victor .... Luis .. and Miguel.....

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nicomena2015
nicomena2015
9.501
hace 5 años

note; ... hello dear colleagues ... I just limited myself to giving a brief explanation to colleague Adrianmb994 regarding his consultation, (reg, N556 runs out of tension) ... that was my intention ... to teach something like certain circuits work ... in this case the function of the V571 ... in no case I asked him what, he would give me as (solution) ... and I admit that he was wrong ... the solution was for the colleague Victor .. . I think it was an involuntary mistake .... if there is any way to change the solution with pleasure I will do it because colleague Victor deserves it ... know excuse me col. Victor this mistake ... greetings !!

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nicomena2015
nicomena2015
9.501
hace 5 años

for colleague Meygil2017tec ... if you can translate me, you mean ... (hahaha but well ... again nicomena ...) ... greetings!

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