Question about JVC AV-20420 20" TV
If there is a short on board, it will probably burn one of the onboard components , and not the main fuse.
Shorts on the main cable or on the power supply area of the circuit cause the main fuse to blow, other shorts doesnt.
However, a short on a pcb is quite unusual, this can be caused by metal dust, a cold joint touching a nearby contact, a broken pcb, and the burnt area can usually be seen and smelled.
I do not think this is a short on board.
You simply have a resistor that keeps burning because of a faulty circuit (eg wrong voltage from a power amp circuit, a burnt capacitor, something that cause a protection circuit to fail, etc.)
If it is the diod , that is easy to test.
You need to locate what is the cause of the overvoltage that keeps blowing your capacitor.
You need to follow the schematics to troubleshoot this.
I do not have schematics for your model. you can download them the following website for free, a free registration is required.
Here is the link to service manual.
If I was you I also would replace the resistor back with one of the same value, that is probably a safety component, and by using a bigger one you risk blowing something else.
Posted on Oct 31, 2008
There is somewhere short on the main board and due to that extra current is passing through the electrical components so the resistors are blowing again n again.check some tracks getting short on the main board.
technician at your place is much advisable as on site reparing is much necessary to locate the clear fault on the board.
feel; free for further assistance.
Posted on Oct 30, 2008
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Posted on Jan 02, 2017
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