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Tube TVs

Noblex 29TC676F does not turn on. Neither standby led.

charly0072012
hace 5 años
hace 5 años
Hello friends of I repair! :) I have a Noblex tv model 29TC676F which I received with the source of the source very damaged. I replaced: IC601 (TN6Q04), optocoupler pc87, D602, D616 and R615. All of the above was totally damaged. Of course, I checked all the resistors and diodes of the primary. I proceeded to turn on the TV, and the fuse no longer burned, but the TV did not turn on. Not even standby. I measured tensions in the secondary of the source, starting with the + by and I have only 1.3v. The other voltages are less than 1 volt. I looked for damaged components in the secondary without Success. The output voltages are taken directly on the diodes, after the chopper. In the main capacitor I have 266v. And in IC601 (TN6Q04) I took the following voltages: Pin1: 7.5v Pin2: 0v Pin3: 266V Pin4: 17v Pin5: 0v I am working with the following diagram: http://www.archivotecnicosaurios.com/descargas/tv/seccion_ordenada/9810_Chassis_LB5-A.pdf If you can give me a hand, I will thank and value it as always! 8-) greetings !!
luis tartaglia
hace 5 años

Measure the mains voltage in AC.
If it gives 220v, desolda pin 3 of the regulator. Not in print. And measure on the main electrolytic pins if the voltage exceeds 300v. I commented

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luis tartaglia
hace 5 años

You must change
C 616.
C699.
And work with the unlinked source. That is, removing one end of R 663 and placing a 100w load bulb. in the + b.

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nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello buddy: remove the Q432 salt-hor- from the board and see if the voltage of 140v is restored in C644 ... check vertical stage if it is not short ... check audio stage ... measure the diodes q, They come out of chopper in direct and in reverse to see if there are not any in short .... comment results ... greetings !!
nicomena2015
nicomena2015
9.501
hace 5 años

something else ... the measurements in the secondary you have to do, taking the tuner's body or sheet as mass .... the measurements in the primary are taken as the negative of the C609 ... this chassis has many protections. ... then we will see that ... check also the L661-L631-L651-L611-L671-L681-at the source outlet and see if any are not open or loose welding ... ok ...

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charly0072012
hace 5 años

Nicomena, sorry for the delay, I lost my access to the account. I went crazy but managed to get it back! :) The fault was in L661! Many thanks to everyone, I consider the issue solved;)

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juangel
juangel
4.110
hace 5 años
hace 5 años
Good morning: friend, I think the problem is at the source if there is no stand-by, if I'm not mistaken that TV has a relay that activates the stand-by check that part and check all the fuse resistors you could have some open. disconnect the + by line test if the secondary voltages appear. luck comments results
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