can't find the LG TV audio jack replacement

[Tyler Grey]

I'm trying to fix my LG TV(42LM6200)'s audio jack, and I need a new replacement to replace the broken one.

Those are the images from schematic diagram and it's the JK3700 as you can tell.

Those images are from the board and it's JK3601 instead of 3700, but it's the same connector. I can tell that.

A link to where I can buy or guides to how to look for theses connectors online would be really appreciated, thanks.

 

[BradtheRad]

Popular sources are Digikey and Mouser. I've gotten parts from All-Electronics discount mail-order house, but their website doesn't appear to carry headphone jacks just now.

Yours looks like an ordinary 1/8 inch stereo headphone jack. It contains a switched contact for one channel. (Perhaps it has a switch for the other channel too but unused.)

If it were me I'd avoid trying to replace the jack. I don't believe I could find an exact replacement with all pins exactly matching. If I were to unsolder the jack, it would risk lifting copper traces on the board. Instead I would see if I can remove the cover (gingerly), and fix the innards. Clean dirty contacts. Bend contacts into correct position.

- - - Updated - - -

By the way, is the jack really broken? Or could a solder connection have a hairline fracture? Etc.

 

[Relayer]

If the jack is truly broken internally, then you'll have a hard time finding a replacement unless you try to obtain the original part from LG themselves.
I noticed the device has SMD contacts as shown in the second photo. Is there a couple of through-hole pins underneath the device that cannot be seen in your photos?
Even if you obtained the exact replacement, do you have the tools to make a clean removal and installation of the new part?
I think Bradtherad's suggestions would be your best options until you get a chance to open up the device. If any of the spring contacts are broken, then yes, you'll need to replace it.
Regards,
Relayer

 

[Tyler Grey]

Popular sources are Digikey and Mouser. I've gotten parts from All-Electronics discount mail-order house, but their website doesn't appear to carry headphone jacks just now.

Yours looks like an ordinary 1/8 inch stereo headphone jack. It contains a switched contact for one channel. (Perhaps it has a switch for the other channel too but unused.)

If it were me I'd avoid trying to replace the jack. I don't believe I could find an exact replacement with all pins exactly matching. If I were to unsolder the jack, it would risk lifting copper traces on the board. Instead I would see if I can remove the cover (gingerly), and fix the innards. Clean dirty contacts. Bend contacts into correct position.

- - - Updated - - -

By the way, is the jack really broken? Or could a solder connection have a hairline fracture? Etc.

Yes, the jack is truly broken. And it is a 1/8 3
5mm jack with 1switch and 4 pins. The switch is always detecting the jack is plugged in not letting me use the internal TV speakers. I've searched Digi-key and Mouser for replacement, but there were no results. I took the jack from the JK3601(audio input) and replaced it into JK3700(audio out. the one I'm trying to fix). I guess this is the best option for now.

 

[Tyler Grey]

If the jack is truly broken internally, then you'll have a hard time finding a replacement unless you try to obtain the original part from LG themselves.
I noticed the device has SMD contacts as shown in the second photo. Is there a couple of through-hole pins underneath the device that cannot be seen in your photos?
Even if you obtained the exact replacement, do you have the tools to make a clean removal and installation of the new part?
I think Bradtherad's suggestions would be your best options until you get a chance to open up the device. If any of the spring contacts are broken, then yes, you'll need to replace it.
Regards,
Relayer

The jack has 2 SMD contacts and 2 through hole contacts. I've gone through all major electronics components sellers but could't find any replacements. So I just took the jack from JK3601(audio input. I don't use it) and replaced the broken JK3700(audio output. the one I'm trying to fix). I really had some hard time dealing with small SMD contacts and super tiny through hole contacts. I managed to replace the jack on the JK3700 succesfully but teared off some copper lines on the JK3601. I don't think I'd ever use the audio input anyways so I'm happy with the results.
The tools I used were a piece of cheap pencil type iron, 1mm diameter solder and the copper solder removing tool which never worked. This definitely isn't proper tools to do this operation, but it worked out pretty well.

 

[KlausST]

Hi,

JK3601 seems just to be a partname on the schematic, it does not define the article.

KJA-PH-0-0177 seems to be the manufacturer order number

EAG61030001 seems to be an order number you can find at a supplier:
**broken link removed**

Klaus

 

[curtisG58]

Tyler:

Exact same thing happened to my LG - headphone jack got ripped off the board from someone tripping over the cable while it was plugged in. I've decided to not replace it. So have removed the jack and try to disable the headphone detection circuit. I haven't been succesfull however at bypassing the headphone detection, as the TV still thinks the headphones are plugged in.

question: based on the schematic, I removed the jack and shorted pins 3 & 4 (L and Detect) but that doesn't seem to have fixed it - tv still thinks there is a headphone plugged in. Did you figure out the pin layout on the jack? Or how exactly the detection circuit works? The way I read it, pins 3&4 are normally closed when there is NOT a jack plugged in.

question: where did you get the colored schematic pcb layout?

Appreciate any insights / info you might have

 

[Tyler Grey]

Hi, glad that I can help someone.

A1. For me, I replaced the 'audio out' jack with 'audio in' jack. I don't remember the exact names but there should be another jack of the same type used to take audio inputs from PC. I could identify that they are the same component from the schematic sheet. And if you don't find yourself not so talented in desoldering or don't want to remove the jack, another way to solve your problem is to short 2 pins used to identify whether the jack is plugged in. TV thinks the jack is plugged in since the detection pin is shorted when jack is not plugged in and gets disconnected when plugged in. I do not know which pins you should short, sorry.

A2. Search for "LG42LM6200(your model number here) service manual" on google and tou should find some pdf files with usually 200-400pages long. These service manuals will most likely help you a lot regardless of what you are trying to do starting from disassembly to entire schematics. And a tip to give you is to use the search function(Ctrl+F) wisely. You don't want to scroll through hundreds of pages looking for a specific keyword.

I hope I helped you somehow, and I would like to hear further progress of your project, thanks.

btw, I gave you a private message containing nothing but your post. Just ignore it, I accidentally touched the submit message button.