Question about JVC AV-27230 27" TV
Horizontal Output TransistorD1875 burns out whenever i fix a new one. It only takes two hrs for Tv to switch off.
The Hor Output transistor is connected to the Line Output Transformer. This transfromer provides a lot of voltages around your TV set but includes the very high voltage to the Picture tube...
These transformers are specially tuned to resonate at a certain frequency,
The Hor output transistor needs to match this frequency....so if the wiring inside the transformer is shorted by "just a bit" the picture will be visible but the transistor is struggling to match the transformer impedance,from the mismatched tuning...so the transistor draws more current from the power supply.. runs hot then burns out...
Usually manufacturers provide a Trip circuit that detects that an overload on the power supply is occuring and cuts the power to the Line output stage ...this is usually detected by a clicking sound within the power supply its called hiccuping.
If some one has altered the correct setting on the power trip circuit then the next thing that happens is the Transistor goes Blooooey like in your case.....
So to save you a lot of money replacing the output transistor
please replace the output transfromer as well next time...
But please... please... re-check the power supply trip circuit to save you a lot more expense in the future....
Best Regards From YUBEUT
Posted on Nov 10, 2007
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Posted on Jan 02, 2017
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