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TV and Video

philco pf2975 does not turn on

Televisor Philco PF2975

nestor villafañe

hace 5 años

Hello friends, I enter this TV with horizontal and burnt fountain. change everything burned in the fountain and horizontal. now the source gives me only 96 volts instead of 140 in stambye when giving power they go down to 86 .. of course with a load of 70 wats. I also had the 470 x 160 b + filter in 360 uf change it remains the same. will it be the source? change ... two resistors .033 that were 2sk 3102 transistor bolts (q613). and an a984 (q612) with its complement c 2274 (q611) opto and capacitor c611 of 47uf x 50. and a resistance of 10 homs 1 w. which was open. I don't know what else to look for. Thank you from now to who gives me an idea to this failure atte. Nestor

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Victor E

65.783

hace 5 años

check the source, in the secondary part the transistors q661, q662 and q663 and the zener diodes respective to those transistors, some wrong and the source does not regulate.

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nestor villafañe

hace 5 años

ok victor tomorrow I try and comment thank you very much

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nestor villafañe

hace 5 años

hello good afternoon victor. I told you I changed a transistor in the source that was open and now the voltage delivered by the source is 136 max in stanbye when power drops to 120 and the source is protected
what will it be?
thank you in advance

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Victor E

65.783

hace 5 años

It has to regulate at 140 volts.

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Victor E

65.783

hace 5 años

VR651 is the pre-set source setting

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nestor villafañe

hace 5 años

yes victor but the most the source knows is 136

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nestor villafañe

hace 5 años

Seeks to turn on, the click sound of the fly is heard and protected

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Victor E

65.783

hace 5 años

measure the source voltage without the horizontal output tr, charge it with a 60 watt bulb or bulb

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Victor E

65.783

hace 5 años

it can be the bad flyback too

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nestor villafañe

hace 5 años

I commented victor I found a diode at the source and I can't find any data on it ... it has .oo457 ...
this one measures badly with leaks and I don't know what type it is ..
with respect to the fly I disconnected it and put 70 w bulb and does the same
. that's why I went back to the source

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Victor E

65.783

hace 5 años

what number has the diode on the board

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nestor villafañe

hace 5 años

d 612 at the source

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Victor E

65.783

hace 5 años

ERA81-004: 45V ... 1A ... 500nS. SCHOTTKY diode

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nestor villafañe

hace 5 años

thanks friend for your time .. tomorrow I will continue to see what happens. a hug then I tell you

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Victor E

65.783

hace 5 años

Ok, greetings

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nestor villafañe

hace 5 años

friend victor FIND THE FALLAAAA. .. I tell you that q642 (c1815) to replace polarized wine at the source around .. I do not explain why?
checking and comparing another I realized that the original is NPN and the one I put is PNP ... I want to die ... now it's on and ten half an hour ago
With respect to the Chottky I got a replacement for an amp ..
Thank you for your time from Etruria. Cordoba Arg. I leave a hug ...

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