About LG power supply

hispeck

New Member

• Nov 11, 2015

• #1

Hi mate,
Am happy to be part of you guys i need help on the psu, this LG tv came to me with green light after powered on but no back light no sound no image, i opened and saw that the psu output of 19v 12v 3.4v 6v and 24v was missing only stb 5v was there the main board is OK, i attached then picture of the psu, the tv model is 32lc7r-tb please any help is welcome
thenks
hispeck

 

Attachments

• 2015-10-21 18.33.36.jpg

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Tony Stewart

Well-Known Member

Most Helpful Member

• Nov 11, 2015

• #2

Big cap in the middle has spewn out toxic electrolyte on the left. Replace it with equivalent or better. Replace the other beside it while you are at it.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 12, 2015

• #3

Tony Stewart said:

Big cap in the middle has spewn out toxic electrolyte on the left.

Click to expand...

It's not a very good picture, but it doesn't look like that to me - more like glue on the board holding components in place.

However, electrolytics on the secondary side that have gone high ESR is apparently a common fault on LG sets, as (like Samsung) they tend to use cheap sub-standard ones.

 

granddad

Well-Known Member

Most Helpful Member

• Nov 12, 2015

• #4

Replace all the electro caps , with 'good ' components . the white blob is just glue .

 

cowboybob

Well-Known Member

Most Helpful Member

• Nov 12, 2015

• #5

Welcome to ETO, hispeck!

This might help you: https://www.eserviceinfo.com/downloadsm/37728/LG_32LC7R--32LC51--32LC52.html

as well as this: https://www.amazon.com/LG-32LC7R-TB-Repair-Capacitors-Entire/dp/B00JCV9DQA

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 12, 2015

• #6

cowboybob said:

as well as this: https://www.amazon.com/LG-32LC7R-TB-Repair-Capacitors-Entire/dp/B00JCV9DQA

Click to expand...

Nice

You can even see four definitely duff ones (with domed tops) in their picture.

 

hispeck

New Member

• Nov 17, 2015

• #7

Sorry guys, the picture is an old one i have already replaced the bad cap before sending posting, the only thing i did not do was to replace the second cap, concerning the schematic sent to me, i have that model but it is not the same with it appears to different, i just need schematic for 32lc7r-tb
thanks in advance
hispeck