Power supply schematics for LG TV LG 55LB5550 Thank You.

Karl Whisenand

• 1554 Answers
• Posted on Jun 10, 2008

SOURCE: LG 42KK Power Supply Schematic Requested

you won't find any just ,

use a thermal probe or thermal gun as heat is likely the issue ,
if nothing else replace the main diode /rectifier and caps.
I find that if I replace the hottest items that usually the fix


if there is room for a small fan you will be doing them a great service and extend the life of the tv.

you may find some info on the power supply from one of these links they are generic enough
http://www.pacificdisplay.com/links.htm

SOURCE: tv won't turn on

I don't have a schematic for it - I will see if one is available or for sale.

I recommend you also ask one of our best tv experts silinteriors he may have the schematic
http://www.fixya.com/users/slinteriors

Sonny Berry

• 8617 Answers
• Posted on Apr 29, 2009

SOURCE: POWER SUPPLY BAD, NEED SCHEMATIC DIAGRAM COMPONENT LEVEL

Polaroid will not release component schematics not even to service centers as they are designed to replace the entire modules while under warranty out of warranty there is very little Chance of obtaining new replacement parts. As i have a 2006 LCD and a 2007 Plasma Polaroids and polaroid told me they are considered a disposable TV replacement parts are not available and suggested that I try ebay

Bud Martin

• 11361 Answers
• Posted on Jan 19, 2011

SOURCE: Lg FLATRON LCD L1730S (L1730SSNTM-AL**E power

Here are the service manuals, please look through them. Please note that if the power supply is not made by LG, it will not show the information in the service manuals.
http://elektrotanya.com/?q=showresult&megnev=LG&megnev2=L1730&kategoria=&kat2=schematics

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

SOURCE: schematic diagram for power supplys LG 60PC1D-AA

I do not have the schematic, but have a testing / troubleshooting guide for the 60PC1D 1st and 2nd generation, which gives some good insight in organization and functionality of the power boards.

This is what we ourselves step on when repairing - LG often does not publish schematics for power boards and sustain boards.

contact us if interested