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Tube TVs
bgh model bt2109usm does not turn on.
227
hace 5 años
hace 5 años
Good afternoon friend, this TV came to me, which first changes all the secondary and primary filters. and alle the tr. q802 on the run, replace it. Now the TV turns on, it makes it start and the medium strong squeaky source transformer is cut off, 3 times then it is protected by leaving the LED flashing, proceeded to cut the j408 wire bridge that goes to the fly, there loads the test focus the light goes on dimly, and when it tries to start it turns on harder it does it 3 times and it protects itself, leaving the led flashing again, when making this fault I proceeded to measure and when I plug in the + b, it gives me 47v, and when I try to start the source goes up to 110v, and falls to 47v. I get the impression that the source is fine, but something does not let you start, change the vertical ic and still some help to get this TV. thanks
46.781
hace 5 años
hace 5 años
Perform the source performance test by releasing it from its load (FBT and TSH) and placing a light bulb (70w) as a provisional source load.
What voltage do you get in + B, both in STANDBY and on the ON order?
Does the squeak disappear?
Make sure the good condition of the flyback (FBT)
227
hace 5 años
Dear Javier, I told you to take the test you suggest in advance and go up to 110v and go down to 46v, at the time of going up to 110v the shriek increases and goes back down with the 40v. the light turns on at 110v and becomes dim at 40v, it is done 3 times then it is blinking led
46.781
hace 5 años
Check the good condition of the components in the primary and secondary stage of the source especially the electrolytic condensers
17.741
hace 5 años
hace 5 años
See if this is the diagram.
https://www.electronica-pt.com/esquema/tv/generic/bgh-bt2909s-chassis-40-00nx56-map1xg-26380/
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