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tv philips 29pt6457 / 44 does not turn on

Televisor Philips 29PT6457

Televisor Philips 29PT6457

4 Soluciones
20 Reparaciones
huberquiroga
hace 5 años
hace 5 años
how about colleagues !!! I leave this TV with TC5.1L CB chassis. the problem was that when I showed the voltage I appeared for a few seconds and it fell to zero in the secondary .. when checking I found the R826 open of 10 ohm x2w. and the Q821 = DA4544 in short. which are changed and regulated by reviewing the components associated with the circuit and finding nothing else. I continue to teach again, when the 220v is connected to the source, a beep is heard and the Q821 and also the Q820 = C2230 and D834 = 9V1 are put back in the box. I REVIEW all that stage and changing the IC802 opto and also the source regulator. and check the entire source by changing filters .... I turn on again and I put the Q821 back on short. Disconnect the + B and follow the same .. I hope you can help me with this problem thanks ..
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Victor E
Victor E
Victor E
65.783
hace 5 años

I change the Q820, does it work with the Q821, and the D834?

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huberquiroga
hace 5 años

Hi VICTOR E !!! If I already change it. It is not clear that the Q821 is shortened.

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Victor E
Victor E
Victor E
65.783
hace 5 años

measured the voltage of + b? must not exceed 130 volts.

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huberquiroga
hace 5 años

Thank you very much, Victor. I SOLVED THE PROBLEM

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29PT6457 44 TC5.1L CB_312278517510[1].pdf
4.4Mb
Javier Chavez C
hace 5 años
hace 5 años
Diagram here: https://www.electronica-pt.com/esquema/tv/philips-esquemas-tv/philips-29pt6457--44-chassis-tc5.1l-cb-15001/ The Q is damaged to the ON order or just by connecting it to the AC network Check that there is no short circuit in the Q821 source load by measuring in the circuit and in the low ohm range or in beep of the emitter to ground in direct and inverse.
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Javier Chavez C
hace 5 años

Measure from the Emitter to ground in the circuit

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huberquiroga
hace 5 años

Hi Javier!! just connect it burns. I didn't even go to Staby. Sorry, I didn't understand that about the Issuer.
by land

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Javier Chavez C
hace 5 años

With the ohmmeter check that there is no short circuit. Measuring on the card, at the points where the Q821 emitter and ground is connected. First the probes in one direction and then invert them.

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Javier Chavez C
hace 5 años

Or what is the same ... Measure on the board where you connect the pins of the C833.
The points live then in reverse

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huberquiroga
hace 5 años

thank you very much javier ,, I already solved the problem ..

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Javier Chavez C
hace 5 años

How to contribute to the forum indicate the changes you made to obtain the solution

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huberquiroga
hace 5 años

the problem was in the R823 2A / 250 .. in medium cold well but when entering it opened it up assuring that there was an overload. that the Q821 be put into preserve.
haa and asl Q820 = C2230 replace you with a C2330 and the TV has been running for 8 hours.

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Javier Chavez C
hace 5 años

Do not forget to evaluate the solution proposals with a like and finally close the issue by solving the proposal that influenced your determinations

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Javier Chavez C
hace 5 años

The R823 itself is a fuse.
Congratulations.
Thank you for your contribution

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Victor E
Victor E
Victor E
65.783
hace 5 años
hace 5 años
It was as I said at the beginning, the components around Q821 in this case a fuse? greetings
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