Re: LG 50" PK540 Plasma Clicking, not turning on.
Hi i'm having the same problem LG 50PK350_ZB with the clicking and not turning on just the red standby light showing, the TV was ok till one day it just went off and wouldn't come back on.
I know this is an old thread but didn't think there was any point starting another on the same problem
Hope someone can give me a few pointers
I have checked the 3 large 10 Ohm resistors, Diode @ D304 3 fuses and replaced the voltage regulator and also tried another main board (the one with the scart/hdmi inputs) but this made no difference.
There was a site on ebay selling 11 SMD resistors the replaced ones on the back of the board but they all have a reading when tested (don't know if its correct) and also if they need to be removed and checked? I was hoping one would be open.
There was mention of bypassing something to get it working with a resistor added somewhere?
Could some one please give some detailed instructions on how to do this and what its for.
Its an old TV and if there was a cheap fix i'd try it but its not worth spending a lot of money on.
Thanks
Do you think it will be possible to probe the AC_DET pin? You may need a piece of wire. Attach the wire to the red probe on your multimeter, and stick the wire on the AC_DET pin. Place the black probe in an exposed screw hole (e.g., for the wall mount.) Set your meter to the 20V DC range and move the probe to the volts/ohms jack. Then plug the TV in. You should measure either 3V or 5V. If it drops to zero during the clicking, you have a very common problem with LG plasmas which is easily fixed 
.
In addition, use the ohms range to measure the fuses on the board. Do this with power off and leave the TV for about a minute to discharge the caps. Measure the resistance from one end to another on the 200 ohm range. You should measure close to zero ohms. Don't confuse the open circuit "1" on right hand side with "1.0" ohms. I expect these will be okay as the screen is flickering but it doesn't hurt to be thorough.
Post a picture of your multimeter if anything is confusing so we can indicate which modes to set the meter to.
.In addition, use the ohms range to measure the fuses on the board. Do this with power off and leave the TV for about a minute to discharge the caps. Measure the resistance from one end to another on the 200 ohm range. You should measure close to zero ohms. Don't confuse the open circuit "1" on right hand side with "1.0" ohms. I expect these will be okay as the screen is flickering but it doesn't hurt to be thorough.
Post a picture of your multimeter if anything is confusing so we can indicate which modes to set the meter to.
Hi i'm having the same problem LG 50PK350_ZB with the clicking and not turning on just the red standby light showing, the TV was ok till one day it just went off and wouldn't come back on.
I know this is an old thread but didn't think there was any point starting another on the same problem
Hope someone can give me a few pointers
I have checked the 3 large 10 Ohm resistors, Diode @ D304 3 fuses and replaced the voltage regulator and also tried another main board (the one with the scart/hdmi inputs) but this made no difference.
There was a site on ebay selling 11 SMD resistors the replaced ones on the back of the board but they all have a reading when tested (don't know if its correct) and also if they need to be removed and checked? I was hoping one would be open.
There was mention of bypassing something to get it working with a resistor added somewhere?
Could some one please give some detailed instructions on how to do this and what its for.
Its an old TV and if there was a cheap fix i'd try it but its not worth spending a lot of money on.
Thanks
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