Lg 37lc55

junger · 06-20-2012, 03:48 AM

Hi All
I have had a couple of the same model giving the same sympton on
LG 37LC55.
When switched on you get no picture, If the LCD is left on for say 15minutes and then the mains cable is unplugged and reinserted then it works perfectly well. I have looked at the caps on the power board and they are not bubbled/dry.
Any ideas, anything I can try?
Thanks
Junger

budm · 06-20-2012, 10:40 AM

Bad cap can look normal but it can have high ESR. What you can do is this, heat up the power supply board with hair dryer, then pug in the TV and see if it will come on. ESR will go down when cap is heated up. It sure sounds like bad caps to me.

tom66 · 06-20-2012, 11:11 AM

The LG 37LC46, 37LC55, 42LC46 and 42LC55 are prone to four bad caps on the PSU going bad. More Samwha WBs.

junger · 06-23-2012, 09:21 AM

hi
which caps are they, so that I can inspect them closer, Thanks for the hairdryer tip, I will try that

psmedley · 06-23-2012, 03:22 PM

http://www.ohmsupplies.co.uk/LG-37LC...301-REPAIR-KIT

LG 37LC55 REPAIR KIT

BOARD MARKED EAY34796801, EAX32268301

FAULT SYMPTOMS:

STAND BY
FLASHING LED
DEAD
WHATS IN THE KIT:

C217
C218
C226
C210
C221
C206
C222
C208

junger · 06-26-2012, 07:11 AM

hi all
The fault has developed further,now I can see in the back, when switched on the hv lights up, after about 10 mins the hv lights strobe/flash and then goes back to normal.
I have replaced the PSU board from my mates LG (same model) and it was the same, so I changed the main board and the fault travelled with the board. so the fault is on the main processing board, any ideas?

selldoor · 06-26-2012, 10:02 AM

Pictures top and bottom of your main board might help.
Did you try the hairdryer trick on the main board.
Please can you update your profile with country and mains voltage.
I will attach instructions for pictures.
Welcome to the forum-
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed
http://www.badcaps.net/forum/attachm...1&d=1290283049

http://www.badcaps.net/forum/attachm...7&d=1280167246

It will be useful if you can say a bit about yourself - skills tools etc.

06-20-2012, 03:48 AM	#1
junger New Member Join Date: Sep 2011 Posts: 11	Lg 37lc55 Hi All I have had a couple of the same model giving the same sympton on LG 37LC55. When switched on you get no picture, If the LCD is left on for say 15minutes and then the mains cable is unplugged and reinserted then it works perfectly well. I have looked at the caps on the power board and they are not bubbled/dry. Any ideas, anything I can try? Thanks Junger

06-20-2012, 10:40 AM	#2
budm Badcaps Veteran Join Date: Feb 2010 City & State: S.F. Bay area My Country: USA Line Voltage: 120V 60Hz I'm a: Knowledge Seeker Posts: 6,983	Re: Lg 37lc55 Bad cap can look normal but it can have high ESR. What you can do is this, heat up the power supply board with hair dryer, then pug in the TV and see if it will come on. ESR will go down when cap is heated up. It sure sounds like bad caps to me. __________________ Never stop learning or per Greek Pro "when you will update your ID from Knowledge Seeker to a Pro (in 10 years) , then I will take you more seriously, for now you are just a kid playing with it keyboard" Baisc LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809

06-20-2012, 11:11 AM	#3
tom66 Badcaps Veteran Join Date: Apr 2011 City & State: University of Leeds (MEng ElecEng undergrad) My Country: UK Line Voltage: 230Vac 50Hz I'm a: Student Tech Posts: 13,569	Re: Lg 37lc55 The LG 37LC46, 37LC55, 42LC46 and 42LC55 are prone to four bad caps on the PSU going bad. More Samwha WBs. __________________ Begin Signature I fix TVs and electronics as a hobby and to save nice things from the dump. 40 LCD TVs, 4 monitors, 13 plasma TVs, and a 6.1 system! Free service manuals database: http://www.tgohome.com/ServiceManuals - Have a manual? Need a manual? Please PM me. I have successfully fixed (from best --> worst build quality): 3 Panasonic Plasmas, 1 Yamaha HTS, 1 NEC Plasma, 2 Sharp LCDs, 2 Toshiba LCDs, 5 Philips Plasma/LCD, 1 Hitachi Plasma, 5 LG LCD/Plasma, 10 Samsung LCD/Plasma, 1 Thomson Plasma, 1 Atec LCD, 1 Hanspree LCD, 1 Xerox LCD, 1 Harwa LCD, 2 Proview LCD, 2 Hyundai LCD, 1 "Onn" LCD, 1 Dell LCD, 1 iiyama LCD, 1 Logik LCD, 5 Bush LCD, 10 Vestel LCDs [Please do not PM me for help: I am a busy student, and we prefer input from all sides on this forum.]

06-23-2012, 09:21 AM	#4
junger New Member Join Date: Sep 2011 Posts: 11	Re: Lg 37lc55 hi which caps are they, so that I can inspect them closer, Thanks for the hairdryer tip, I will try that

06-23-2012, 03:22 PM	#5
psmedley Senior Member Join Date: Apr 2012 City & State: Greenwith, SA My Country: Australia Line Voltage: 240VAC 50Hz I'm a: Knowledge Seeker Posts: 128	Re: Lg 37lc55 http://www.ohmsupplies.co.uk/LG-37LC...301-REPAIR-KIT LG 37LC55 REPAIR KIT BOARD MARKED EAY34796801, EAX32268301 FAULT SYMPTOMS: STAND BY FLASHING LED DEAD WHATS IN THE KIT: C217 C218 C226 C210 C221 C206 C222 C208

06-26-2012, 07:11 AM	#6
junger New Member Join Date: Sep 2011 Posts: 11	Re: Lg 37lc55 hi all The fault has developed further,now I can see in the back, when switched on the hv lights up, after about 10 mins the hv lights strobe/flash and then goes back to normal. I have replaced the PSU board from my mates LG (same model) and it was the same, so I changed the main board and the fault travelled with the board. so the fault is on the main processing board, any ideas?

06-26-2012, 10:02 AM	#7
selldoor Slow Learner Join Date: Dec 2010 City & State: Lancashire UK Posts: 4,657	Re: Lg 37lc55 Pictures top and bottom of your main board might help. Did you try the hairdryer trick on the main board. Please can you update your profile with country and mains voltage. I will attach instructions for pictures. Welcome to the forum- We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply. Please do not post inline and offsite as they slow down the loading of pages. Examples of what is needed http://www.badcaps.net/forum/attachm...1&d=1290283049 http://www.badcaps.net/forum/attachm...7&d=1280167246 It will be useful if you can say a bit about yourself - skills tools etc.

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