SYMPTOMS: Dead set. It won't turn on at all.
DIAGNOSIS: This model specifically, along with a few others by LG have what's called a FLASH IC on the motherboard (MAIN PCB). This is the most common point of failure.
SOLUTION: Replace the FLASH IC for your model. If this cannot be done, replace the MAIN PCB for your model. Listed below are the different models affected, part numbers for their respective MAIN PCB's and FLASH IC's, and the location code for each IC.
55LV4400
- Main PCB: COV31310901
- Flash IC: COV31451701
- Location: U14
- Main PCB: COV31310801
- Flash IC: COV31451801
- Location: U18
- Main PCB: COV31310701
- Flash IC: COV31451901
- Location: U18
32LV2400
- Main PCB: COV31310601
- Flash IC: COV31452001
- Location: U18
Here are some picture references if you need help finding the Flash IC on the MAIN PCB:
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| Model No. 55LV4400 Location U14 |
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| All other affected models Location U18 |
As an added tip, make sure you find or acquire a fine tip (puns suck sometimes) for your soldering iron. It will make things a lot easier, trust me. If you are having trouble soldering the connections (and they are VERY small connections, trust me on that, too) it's normal. The best thing you can do is minimize the time the soldering iron makes contact with the part/pcb so that it does not become damaged from heat. If you have some copper braid like Chem-Wik, you will find it very helpful in the desoldering process. A solder sucker may also work well, but I have found I have no affinity for solder suckers (just a personal preference). Anyway, good luck and have fun!
HI:does anyone know where I can get the Flash IC: VOC31451801 for the 42LV4400 ,wanted to repair my set
ReplyDeleteOops, my apologies. I accidentally transposed the V and C in the part numbers on some of those. I must have been experiencing a bout of "lysdexia" haha. Anyway, just search using "COVxxxxxxxx" as opposed to "VOCxxxxxxxx" and you should have no trouble. I will fix the typos immediately.
DeleteHere's a link to the part on Encompass.
http://www.encompassparts.com/item/9170586/LG_Electronics/COV31451801/Ic,flash_Memory
So I have order the COV31451901 for the LG 42LV4400.Is this just a straight swap and the TV should turn back on?(red LED on and tv does not pwer up problem,as described in blog)
ReplyDeleteAlso is there a way to help prevent the IC from getting damaged again? Just don't want to keep doing this repair over and over again on my personal TV?
BAD on LG's part to even release a tv with a fault like this to the public.
Yes, it is a direct swap. You will have to possess some sort of competency with a soldering iron in order to make sure the joints are solid and that you haven't bridged any connections by accident. Given that you didn't put the chip in backward and did well with your soldering, the set should return to full functionality. I've done three or four of these TV's now, and all of them are still going strong. If you would like a few pointers on the procedure for installing the new IC, feel free to contact me.
DeleteThe IC's that keep going bad on the main boards are all part of a bad run of that particular part from what I understand. If you buy a new IC now, it should not be subject to the same flaw.
If you purchased your TV less than one (1) year ago, you can still get it repaired in-warranty, too. Just a thought.
Thanks for this Forum. I followed all of the above. I haven't soldered anything in at least 6 yrs and had to buy equipment and the COV31451901. Desoldering was the hardest part but the TV is back up and running and actually turning on and off. Hopefully it keeps up.
ReplyDeleteGreat! Glad to hear it. I hope this blog continues to be a help to DIY'ers out there.
DeleteDoes any one know where to get the bin files for the 55LV4400, 47lv4400 etc?
ReplyDeleteI guess I'm not sure what you are asking? Do you mean the firmware?
DeleteLG 42LV4400 42"TV that blows the fuse on the power supply board the moment I plug it in,does anyone know what causes this?
ReplyDeleteTry testing the PSU. Check voltages at each pin on each header. If everything checks out, it's likely not the PSU causing the issue. If need be, I'll try to dig up a proper schematic.
DeleteI had this problem and called LG. They repaired it free of charge even though my LG 32LV2400 was 6 months beyond the normal warranty. It's worth a call. The number is on the back of the TV and they insist you have proof of purchase.
ReplyDeleteYes! Definitely do this. Never try repairing your TV yourself if you have not already contacted the manufacturer. A lot of times if you are polite on the phone they will help you out with the cost of repairs (even out of warranty).
DeleteMy LG 42LV440 made a zzzzttttt sound and shutdown. Now it will not turn on (no lights, nothing)... Do you think the Flash IC is the issue? Can I test the FIC or should I just swap it out?
ReplyDeleteThat doesn't sound good! As I said in the post, the Flash IC is a most common mode of failure for these symptoms. However, that doesn't mean there cannot be cases in which the Flash IC is not to blame. Always try testing the PSU first when there are power issues. Gather more information if you can, and then either get back to me or if the PSU is bad, try replacing the Flash IC (or entire mo-bo if you aren't proficient with a soldering iron).
Delete