My unit had been powered off for two weeks while I was on holiday, on my return it will not power on for longer than 3 seconds. it then drops back to standby.
I have disconnected it from the TV and checked the internal fuse.
Can anyone please help ??
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Re: Unit stays on standby
The only thing I can find in the manual (link below) is to remove the power cord for a few minutes & try powering on from the "Standby ON" button, also set the "source" to anything other than TV.
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Usually when replacing capacitors in a switchmode power supply, it is recommended that ALL the caps be changed in one go, rather than just replacing a couple (it is possible that the PSU is not fully functional since you only changed a couple of caps, therefore putting stress on other components such as diodes etc. hence why it won't stay on for longer than 5 seconds).
I suggest that you go with the easiest (and cheapest) option first - replace ALL the electrolytic capacitors in the PSU, this may totally solve your power standby problem - and the unit should remain on and function properly.
I also suggest replacing the 3 caps you already changed (C17 C19 C23) with fresh ones along with every electrolytic in the PSU - see if the unit remains on after that. If the unit still goes back to standby or shuts off, then check all of the other components (including any IC regulators and diodes). in the same circuit.
Where some electrolytics have strange values, replace with increased capacitance value and/or working voltage of each as required (note the value/voltage etc., of each of the original caps before you change them).
The good news here is if you do the above suggestion, and it works out well, all it will cost you is a bunch of capacitors and/or other parts as needed. No workshop charges if you do the repair yourself.
Fingers crossed that all you need is the abovementioned caps; but you need more than 3 to complete the job.
If your bulb finally reaches it's end before you have the chance to replace it you unit will shut itself down and go into a permanent standby mode. Changing the bulb alone will not remedy the issue. The solution is quite simple but not posted in the manual or anywhere else that I could find for that matter! All that is required is to hold down the HELP button on your remote for 10 seconds while aiming at the infrared sensor on the unit. This will reset the units bulb timer and remove it from the standby mode.
This set has a modification that needs to be done. It will also start turning on by itself and changing channels rapidly.
It's two weeks old. Take it back to the Retailer or if that is not an option contact LG at 1-800-243-0000 to get a local servicer in your area.