LG 42LC55 Standby - Techwatch Support Forums: Digital & Satellite TV, FTA, Cable, Computers, Mobile Phones, Apple and General Tech Forums

01484 · 03-02-12, 09:24 AM

I have a LG 42" tv which keeps going into standby after about 5 minutes the tv is on. I have replaced the power supply 3 times, changed 9 capacitors on the power board, replaced the lcd backlight bulbs. But still the problem persists. I cannot think of anything else that could be wrong.
However there are alot similar probelm going on with this particular model and i have read other forums and sme people have said replace the capacitors then it should be fine (i have done this but no luck).
Does anyone know what the problem could be. I mean the tv works perfectly fine its just that when your watching it then after about 5 minutes it goes straight into standby. Then when you try to turn it on it goes off into standby again.

Tee_111 · 03-02-12, 09:27 AM

Have you checked the standby setting? it might be set to sleep every so often..

01484 · 03-02-12, 11:26 AM

Thanks for your fast reply. I tried to turn the tv on but it doesnt even turn on now, when i turn it on the green light comes on but nothing appear to come on the screen it just stays black then all of a sudden the green light changes to red again (goes back into standby)

Tee_111 · 03-02-12, 12:56 PM

Check the capacitors.. did you get the correct voltage to replace?

reddiesel · 03-02-12, 02:10 PM

It will shut off if it detects a fault, have you downloaded the service manual ? It should have a self diagnostic menu that you can access, that should give you a clue, there might be a fault on a different board thats causing the problem. Have you checked the T Con board ?

01484 · 03-02-12, 02:13 PM

iv tried looking for a manual online but cant find it. If anyone could give me a link would be grateful. Thanks

Tee_111 · 03-02-12, 02:23 PM

Try LG Website...

http://www.lg.com/uk/support/product...rt-product.jsp

mikie8 · 03-02-12, 03:25 PM

it sounds like caps failing . only use 105C caps . heat is the enemy in modern tv's . i always replace with high quality low esr caps like panny fc caps on the psu .

01484 · 13-02-12, 09:22 PM

Fixed problem, it was due to poor capacitors so basically just replaced the ones that needed replacing and it works now, doesnt turn off at all.
Thanks for everyone who replied!!!

03-02-12, 09:24 AM	#1 (permalink)
01484 Senior Member Join Date: Jan 2009 Posts: 155 Thanks: 5 Thanked 46 Times in 17 Posts	LG 42LC55 Standby I have a LG 42" tv which keeps going into standby after about 5 minutes the tv is on. I have replaced the power supply 3 times, changed 9 capacitors on the power board, replaced the lcd backlight bulbs. But still the problem persists. I cannot think of anything else that could be wrong. However there are alot similar probelm going on with this particular model and i have read other forums and sme people have said replace the capacitors then it should be fine (i have done this but no luck). Does anyone know what the problem could be. I mean the tv works perfectly fine its just that when your watching it then after about 5 minutes it goes straight into standby. Then when you try to turn it on it goes off into standby again.

03-02-12, 09:27 AM	#2 (permalink)
Tee_111 Super Moderator Join Date: Dec 2006 Location: West Yorks Posts: 2,291 Thanks: 93 Thanked 255 Times in 184 Posts	Re: LG 42LC55 Standby Have you checked the standby setting? it might be set to sleep every so often..

03-02-12, 11:26 AM	#3 (permalink)
01484 Senior Member Join Date: Jan 2009 Posts: 155 Thanks: 5 Thanked 46 Times in 17 Posts	Re: LG 42LC55 Standby Thanks for your fast reply. I tried to turn the tv on but it doesnt even turn on now, when i turn it on the green light comes on but nothing appear to come on the screen it just stays black then all of a sudden the green light changes to red again (goes back into standby)

03-02-12, 12:56 PM	#4 (permalink)
Tee_111 Super Moderator Join Date: Dec 2006 Location: West Yorks Posts: 2,291 Thanks: 93 Thanked 255 Times in 184 Posts	Re: LG 42LC55 Standby Check the capacitors.. did you get the correct voltage to replace?

03-02-12, 02:10 PM	#5 (permalink)
reddiesel Super Moderator Join Date: May 2007 Location: Beds Posts: 5,708 Thanks: 176 Thanked 957 Times in 839 Posts	Re: LG 42LC55 Standby It will shut off if it detects a fault, have you downloaded the service manual ? It should have a self diagnostic menu that you can access, that should give you a clue, there might be a fault on a different board thats causing the problem. Have you checked the T Con board ? __________________ Last edited by reddiesel; 03-02-12 at 02:27 PM.

03-02-12, 02:13 PM	#6 (permalink)
01484 Senior Member Join Date: Jan 2009 Posts: 155 Thanks: 5 Thanked 46 Times in 17 Posts	Re: LG 42LC55 Standby iv tried looking for a manual online but cant find it. If anyone could give me a link would be grateful. Thanks

03-02-12, 02:23 PM	#7 (permalink)
Tee_111 Super Moderator Join Date: Dec 2006 Location: West Yorks Posts: 2,291 Thanks: 93 Thanked 255 Times in 184 Posts	Re: LG 42LC55 Standby Try LG Website... http://www.lg.com/uk/support/product...rt-product.jsp

03-02-12, 03:25 PM	#8 (permalink)
mikie8 Senior Member Join Date: Feb 2010 Posts: 122 Thanks: 3 Thanked 30 Times in 28 Posts	Re: LG 42LC55 Standby it sounds like caps failing . only use 105C caps . heat is the enemy in modern tv's . i always replace with high quality low esr caps like panny fc caps on the psu . Last edited by mikie8; 03-02-12 at 03:30 PM.

13-02-12, 09:22 PM	#9 (permalink)
01484 Senior Member Join Date: Jan 2009 Posts: 155 Thanks: 5 Thanked 46 Times in 17 Posts	Re: LG 42LC55 Standby Fixed problem, it was due to poor capacitors so basically just replaced the ones that needed replacing and it works now, doesnt turn off at all. Thanks for everyone who replied!!!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Silvercrest SL65 cycling on & off standby	Mell	Comag/SilverCrest	3	01-05-11 06:17 PM
a780 stuck in standby	simon_g84	Kryptview	8	06-10-10 05:50 PM