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!
If you can help me, please feel free to email me on LLYRSMITH@AOL.COM
I connected to the RS232 and am receiving the following items
(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?
That is exactly the problem my 2nd tutorial fixes. The 2 resistors used basically send a signal to force the tv to boot up and bypass errors like that. See the first post of this thread.
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!
I decided to upload it to rapidshare instead. This firmware is only for north american tvs and is a different version than 4.30.1. It works for sure as I've installed it on my tv and tested it. Heres the link:
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.
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.
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
Hello everybody. I know this post is super old but I have a question a maybe someone can help me. I have a LG 37LG30 with no remote and the power button don't work. I need a solution to turn it on in order to program a universal remote. Already thankful
I would like to thank you for providing the tutorials. I used the second one to start my LG RZ37LZ30 LCD TV. I found one of the flat cables with a 6v 2a supply on one pin - no 5v on this panel. It also had inv.and pwr 1 on/off and pwr 2 on/off using the 10k resistors I connected the 6v to inv and pwr 1 on/of.
I also had to remove the power relay and loop its contacts. Lo and behold the panel now appears to be working normally.
Do you have any ideas on if the original fault is in the power board? All the electrolytics look ok and checking in situ with a simple meter does not show any faulty ones - I dont have a proper capacitance meter. Also I dont have the power supply diagram. It is a KN-powertek KNP-3800 Rev 9 and part number 6871TPT283A - any idea where I can get sight of the diagram?
If you have any info please let me know.
In the meantime thanks for the usefull pointer to fixing the thing!
I tried Tutorial-1 and did not see the "mstar#" command...assuming that I need to go for 2nd tutorial. However, I could not find 5v pins on my flat cable connector socket (on main board). I only see 4 pins with of 3.5v rating. can I pick any 2 of those 4 pins? or there is another 5v pin somewhere else?
I can send you picture if I can directly contact you through Email.
Inspection of the main power board showed C802, a rectangular capacitor at the top of the board between the transformer and heatsksink was bulging at the sides. Found the part, 0.022uF 1.25KVDC, on DigiKey at $0.89 + ~$3 shipping. Replaced, TV working like new again.
Just posting as a possible quick-fix for others...on first inspection I was looking only at the usual suspects, the electrolytic caps. Then after removing the board for a both-sides inspection, noticed the bulging film cap. Attached photo clearly shows it, complements of an ebay seller offering the same cap for $7.99 + shipping.
Last edited by Refnoredcard; 09-15-2014 at 07:52 PM.
I have a LG 32LH30 LCD TV. In order to make the USB drive working, I seem to have installed a European firmware. After this the TV is not switching on. The blue light and the red light alternate. I tried your Tutorial#1 and could not see the mstar# on the terminal. The ZOC terminal emulator is not recognizing the port/com when connected to the TV. Does this mean, I should go through the Tutorial#2? Since the issue started with wrong firmware installation, I strongly believe a change in firmeware should do. Can you please help.
The only real problem was getting the legs to fit in the connector, eventually solved with a small screwdriver and pliers.
(Currently only tested for LCD)
Can someone post a picture how it should look like ?
I know this is an old thread but I have the same issue!
My problem is with a LG425000. I have updated the firmware but this did not fix the problem.
Can someone give me some explanation on fix #2 in post #41 ? I don't see on the board the
signal name of the pin ( pwr_on and inv_on) where I should insert the resistors. Any idea of what should I look for instead?
Thanks in advance for your help!
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