I have a Fix for LG TV's that won't turn on - Page 3

do you have a fix that will make a LG 26LH250C stay turned on always?

Hi All,

I have a 3 year old LCD HD Flat screen TV, about 6 months ago it started playing up while turning the tv on. A similar problem to what many people are having, where we switch the tv on, the blue light comes on along with the picture and the sound and then it switches itself back off and the red light comes on flashing. At first we did what everyone has done and that is switch the tv off at the mains for about 30 seconds and switch it back on, and this worked for a little while.

A short time later it was switching itself off more and more and it was taking approx an hour to get the tv to stay on until recently it just went off with the red light staying on and wouldnt do anything else. After looking online i also discovered that this was a common problem mostly caused by capacitors.

I took the back off the tv and noticed 6 bulging capacitors 4 with a black substance leaked out of the top. I de-soldered them, noted their values and bought exact replacements in terms of uF and temperature but with a slightly higher voltage as i discovered that many manufacturers of tv's fitted capacitors designed with a shelf life due to not being enough voltage to cope for long.

I de-soldered the circuit board where i took the capacitors out so that i could fit the replacement parts and did that last night, I replaced the plugs which connected the circuit board to the other boards which i had previously unplugged to get the board out of the tv.

Once I replaced the board and screwed the back cover back on to the tv i powered it up.

The tv ON light (Blue) came on along with the sound of the channel, it didn't switch off at all. But the screen stayed black, there is no picture. Sometimes when there is a black screen when you first switch on a tv you still see the small display in the top corner indicating the name of the channel (AV for example) but there is nothing.

If anyone else has had this problem i would really appreciate hearing from you if you have a fix for it, or if anyone has any idea of what could be wrong i will be very happy to hear from you. I have thought that it may be a dry joint (bad soldered joint) and have thought of taking them back out again and re soldering them in, but i am hoping someone else might have other ideas as i didnt realise how common a problem this is for people.

I paid £1000 for this tv and i cant afford another like it, and i think to have it repaired would cost me about £400, but i know that it is a part issue which would probably cost under £10 to buy and have delivered and fit myself. I cant afford £400 either!

Please help!

If you can help me, please feel free to email me on LLYRSMITH@AOL.COM

Thank you

Thats your inverters dude. should be able to find some of these on ebay

OK..I have an LG 42lb5df LCD TV.
I connected to the RS232 and am receiving the following items

=================================
SC_ASSERT(FALSE)
(0 hour, 0 min, 3 Sec)


File : NVMDB_DDI.c
Func : DDI_NVMDB_InitSysDB
Line : 293
Task : ROOT
=================================

To me this is a boot error. It will try to boot indefinitely. Because I cant get to the "mstar#" notification, I can't reload the Firmware.

Anybody out there got any ideas?

Thx!!

@electrobit....
Thanks for your response. I have tried the"fix". On P201 I have 2ea "5Vs" pins(pin 8 & 3). I have 1ea "pwr_on" and no "inv_on" pin. I am assuming that the "inv_on" pin is on P201. There are times that the inverters do fire up BUT I still am getting the same error code. Any help would be greatly appreciated!

OMG, I totally don't get all that techno stuff you posted. My little LG tv takes about an hour to come on after turning it on. I don't know what to do, and I don't understand your post...now what?

now you have to call a repairman?

Thanks for the tutorial electrobit.

Does anyone have a working link to a LH firmware? None of the ones posted on this forum are working anymore. I am at the point where I am connected via ZOC and can run the swuz command but I don't have a file to select. I have a 32LH30, with firmware 4.05.00 but would be willing to try 4.30.1 or anything else around that just because my tv can't get any more useless.

Thanks again.
Edited by McGarnagle1 - 1/3/13 at 8:27pm

Well after days of searching, I was able to find a copy of the 4.30.01 North American firmware and successfully fixed my 32LH30. Thanks again electrobit.

Here is the link: http://www.general-files.com/download/gs50f5f0f0h32i0/LG7J63240W_US_IC102_V4.30.01_flash.zip.html

If this link is dead in the future, feel free to send me a message and I will try to share it somewhere.

I've got a LG 32LC46 TV. It was working a treat but then it started to take longer and longer to switch on. Eventually it started to take a whole hour to switch on. I then decided to leave the TV on standby all night instead of turning it on at the mains. Unfortunately it wouldn't come out of standby. I unscrewed the TV and saw 4 bulging capacitors. I ordered a repair kit off ebay that contained the capacitors, solder and desoldering braid. I replaced the bulging capacitors and now the TV is working again! :-) I took a risk as I have never fixed a TV or done any soldering before but the risk paid off and I am happy. The kit cost me £10 plus £10 for the soldering iron. That's £20...a lot cheaper than paying a repair person or buying a new TV. Girl power! ;-)

Before trying anything - simply use a hair dryer (set on high heat) over the back panel hole vents for a few moments (may take a couple of goes to dry it out enough) - I did this and too my relief it worked. Problem was a case of fine condensation build up - leave TV on for at least a day to allow it to dry itself out fully. Hope this easy idea works for you too - good luck!

It works for me, but is there a way to fix it permanently, so I wouldn't have to blow it every day?

Thanks in advance.

Agree! This way is somewhat temperamental - we still have to use the dryer around once a fortnight / month - however, with persistence it's improved.

Try auto tuning all stations/time again - this aids a reset.

Also this might help too - we've moved the set to another (dryer) part of the room plus purchased a room humidity absorbing product.

AND... Don't discount 'crossing your fingers' for luck

Hi,
I have a mac and dvi/hdmi converter cables can I used this instead or does it have to be a PC?

Thanks!