Burnt Mark On Circuit Board
There will always be a decision whether to scrap off the burnt mark or just let it remain at that way. Please see the photo. It all depends on the problem. If the problem is intermittent then it is advisable to remove/isolate the burnt mark. Even if it did not pose any problem at current moment it doesn't mean that the circuit will be stable in the future. This means it has the possibility to cause problem after many hours of using the equipment. The reason why the particular circuit board became darkened was because of a resistor placed too near to the board. The resistor was tested good. The best solution is to place the resistor with longer lead so that the resistor body would not touch on the circuit board. And at the same time scrap the darkened area off with a blade to prevent any conduction between circuit tracks or components. This will eliminate future solid or intermittent problem.
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dicksy
November 28, 2012 at 11:32 pm
hello jestine .can u please help me with this lcd tv.problem was back light sudden off.all the voltages are good and stable.inverter on voltage also present.bypass the inverter and checked the ccfl lights.they r good but when it on one of the blu 6kv capacitor near the hv transformer getting very hot. i changed that.and changed hv transformer and all the fets plus inverter ic.but the same problem.how can i fix this.pls help me
thank u very much
Jestine Yong
December 3, 2012 at 3:30 am
Hi Dicksy,
It could be one of the high voltage transformer have problem since you already checked the backlights and inverter ic.
Jestine
dicksy
November 28, 2012 at 11:35 pm
soory sir that my tv was LG42LH3000