Re: LG 37LC2D No Sound, and No Channels
The 12v drops to 11.0 when the middle is unplugged.
The 12v drops to 11.0 when the middle is unplugged.
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Re: LG 37LC2D No Sound, and No Channels
sorry, I double posted.Comment
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Re: LG 37LC2D No Sound, and No Channels
So it's almost dropping the same as the 6V does, which leads me to believe there's a short circuit on the board between the 12V and 6V. I have no idea if this could cause your issue - but it's definitely a problem. The higher voltage could potentially cause a voltage regulator (or a few) to overheat, causing some odd problems.
Did the problem suddenly develop or slowly get worse?
Can you unplug the TV, wait 30 seconds, then remove the power board and take a clear photo of the under side (green side?) From memory there are MOSFETs providing 6V, which could short-circuit.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
Okay, well there is definitely a blow out! This must have been the problem the whole time.Attached FilesComment
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Re: LG 37LC2D No Sound, and No Channels
There is also a rattle noise coming from the board when I shake it. Sounds like something is loose inside of something else.Comment
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Re: LG 37LC2D No Sound, and No Channels
Yeah, these TVs have always amazed me - the power board can have a severe failure and the TV still mostly works.
That right there is a MOSFET which has had a bad day.
The damage is likely to extend further than that MOSFET, so I would say getting a new PSU would be the best option, unless you want to repair 20 other SMD components.
I think the rattling is the relay, it is normal. When you plug in or turn on your TV you probably hear a click or two, the relay is making that sound. It consists of a contact, which can move, and a coil, which pulls the contact when the coil is energized (current flows through the coil.)
I just hope that no damage has been done to the main boards.Last edited by tom66; 07-24-2012, 01:04 AM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
I will try a new PSU and see what happens. Hopefully the rest will be fine. I'm really unsure about the TV not getting channels though. Makes me believe that something else may have blown too. I really appreciate your help! I'll report back and let you know the outcome.Comment
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Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
"I'd guess you should see more than 1k ohm" spot on,i repaired a uk version with bad 6v and a 12v rail the resistance to ground on the rails was 1027kohm,unfortunatley the psu had simular damage from shorted mosfet on solder side,loads of smd fried and open circuit,it was more economical to replace the psu,(bout £25 i think),the tv worked fine after that.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: LG 37LC2D No Sound, and No Channels
Hello, I have a similar problem, no sound.
Just voltage on 3.4V is incorrect
3.4V-1.16V
Middle connector unplugged 1.16V
I had 1 bad capacitor, after replacement most of them except 3800uF ( green V mark) beside connectors, no difference
When the TV is off few hours sometime the sound is back and the led beside 'x' is lighting. After a few minutes the sound is cracking and getting off then I see this LED gets dark and off
Any help is much appreciated !Attached FilesComment
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Re: LG 37LC2D No Sound, and No Channels
My personal theory is the buck converter IC is failing (8pin SMD on bottom of PSU board) but I've never been able to confirm such.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
Thank you Tom66, i just look at the forum on your Thread https://www.badcaps.net/forum/showthread.php?t=20932 a got the exact same problem and same caps.
It is 100% PSU? I think i have no chance to fix this one, can't find this 8pin SMD on the internet and we are not sure 100% is it this one, probably i need to buy a new PSU
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Do you mean one of those 8pin SMD?
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Re: LG 37LC2D No Sound, and No Channels
Yes, the one without the large copper areas connected to it, it is the controller chip.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
3037CS
611P
CC1M7
On which number i should look to find one?
I found one, it is same or different? I looked at no. 3037cs
"8-PIN SYNCHRONOUS PWM CONTROLLER" http://www.datasheet-photos.com/ProI...tNumber=3037CS or here: http://www.aliexpress.com/wholesale?...20130813071852Attached FilesLast edited by ergela; 08-13-2013, 09:20 AM.Comment
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Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
tom66 thank you for your time. So just the no. 3037sc is important? no matter which i will get just must be 3037sc because is see they have different numbers belowComment
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Re: LG 37LC2D No Sound, and No Channels
The other numbers are production/lot codes, so not usually important.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
One thing to make sure is that you get the SO-8 or SOP-8 size which matches your board (compare the ratios), not the MSOP, or other sizes.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 37LC2D No Sound, and No Channels
Ok I will let you know how it works when I replace. Thank you!Comment
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Re: LG 37LC2D No Sound, and No Channels
I replaced 3037sc but no result
After this I swapped this 2 smd beside 3037sc [ 2 are the same] they going there where was a bad capacitor and now 4th red led is on but I think not bright enough.
You think it could be the problem?
Look at the picture, I should look for ic smd IRF7807Z or other numers? http://www.ebay.ie/itm/IRF7807Z-INTE...item2ec7bba515Attached FilesLast edited by ergela; 09-05-2013, 06:17 AM.Comment
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so i took out one of my spare gigabyte ep35-ds3r mobos from storage for use to do some cpu, ram and video card testing of stuff i bought from ebay and got for free from momaka. he bought 50 e8400 cpus for cheap from ebay some years ago and i decided to help him relieve him of some of his supply since he had waaaay too many!!
what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol! 
i had to blow some dust off the board and heatsinks with the datavac as i didnt clean it up before putting it in storage. after finishing... -
Hello, i had this amp sitting in the closet knowing that none of the channels were working. After taking it all apart i found 4 bulging main filter caps so i went ahead and replaced those with low ESR kmet caps. However after doing this it only restored sound to Surround L, Surround R, and Center channel. The main speaker fuse on the transformer F905/F906 keeps blowing so i decided to remove all of the transistor's on those 4 channels and measure them. All transistors appear to be in good working order(turned receiver on with none of them installed and fuse still blows). Checked dual emitter resistors... -
Good day ladies and gentleman!
I am currently trying to repair a Grundig Vision 9 37 9880 T USB LCD TV for a friend that has a weird audio problem. Basically everything works fine except for the heavily distorted sound when the Subwoofer module is connected and there is a buzzing sound coming from the PSU PCB.
This seems to be a rather rare TV so there is not much prior on topic help to be found however a service manual is available at the usual sources (Electro Tanya i.e.).
I think the PSU buzzing comes from one of the coils near the bridge rectifier but... -
Hello to the forum.
My name is Christos, I am new to the forum here and i am posting from Greece.
So i have this old German sound card from Marian, called Trace Alpha. To be exact i have 2 of them and i use them professionally for my small FM radio station here. The first one works like a charm, but the second one does not work at all.
To be more specific in the same exact pc with windows 7 (i even tried 32bit) the one works while the other doesn't.
So i tried asking for a schematic from the company and they would not give me one. Instead they... -
This specification for the HP ProDesk 600 G5 + LG SJ2 Bluetooth Sound Bar can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the ProDesk 600 G5 + LG SJ2 Bluetooth Sound Bar boardview and ProDesk 600 G5 + LG SJ2 Bluetooth Sound Bar schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please...09-12-2024, 02:30 PM
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