SOURCE: LG 42PG20 Plasma blew a
Hello,
Once the voltage the television is connected to is very high, there is a very high tendency that the board will blow again, and it might not be as soon as you replace the board.
You will still have to replace the board, but you will try to get a board with higher capacitance on the capacitors. That way if exposed to higher voltage it wont get bad.
Also a tip is for you to get a step down transformer for your television or a stabilizer so as for the television not to be exposed to a very high current. That should help reduce the risk of having the board getting burnt again.
The screen only vents out once there is excessive heat in the unit and the fans in it are not working, then the screen can vent out.
Carefully assess all the boards on the television for any bad capacitors, like the ones that are swollen, it is not necessary for them to be bursted or smelly before they are bad, you just have to check for the ones that are already swollen.
Hope this information was helpful in solving the problem.
Goodluck
Elect_Comp
One bad lead can cause a computer to continue on a cycle or
to shutdown or fail to detect your Test your PSU or replace it if your power
supply units fan is not working your PSU is faulty
hard drive
Test all leads that attach to your hard drive including electrical
extensions,IDE,SATA
the leads from your
"((motherboard to your hard drive))" make sure they have a secure connection and are not faulty or
just replace them they could be faulty
make
sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have
secure connections and are not faulty even the electical extensions or just
replace them they could be faulty a computer needs its connections to continue
its cycle and have an end so any faulty leads will end up with a computer error
hope this helps
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I'm pretty sure a voltage surge will have caused the failure of Q302. Let's face it, with a wide input range PSU (100 to 240v) and the UK's 230v supply, and knowing the so called supply limits (+5% and -10%) you can see how close to limits the PSU board is working!
In reality, if you are fed from a sub station, there can be some pretty hefty surges experienced - far in excess of the stated limits. Unfortunately, catastrophic failure can occur in milli-seconds.
As for the requested circuit diagram. It would assist in identifying the 'raw input voltage points' within the circuit and assist in eliminating any likely additional failures.
With everything hinging on the integrity of the power supply, the 240v users are very likely to sustain a high proportion of failures.
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