Lg 60LN5710 LED SCHEMATICS - LG Televison & Video

so working on super old 2007 PC monitors. and no PC connected."? it is NOT ANY LED BACK LAMP monitor here.
came new with XP PC's.
the monitos all good to sleep mode if no PC vidoeo connected.
in the usa, even by law, (energy star)
how ever lacking a PC, the screen will show "no signal entering sleep mode"
VGA monitor.
LED = blue on, amber sleep, LED out, oFF.
NO 1080P mode allowed, (so common now) <<<< big clue here.
set the PC to 1024 x 768 (to test ) 60Hz.
using a flash light (torch) tool,.
turn on Monitor, see blue LED
point flash light to screen, see data, now, on sceen in the beam
now you now CCFL backlamps are dead. as most are this old.


Display Modes (Resolution)

640 x 350
720 x 400
640 x 480
800 x 600
832 x 624
1024 x 768
1152 x 870
1152 x 900
1280 x 1024
1440 x 900

proof BELOW. A FREE MANUAL TOO.
page 47, see 4, CCFL jacks and HV supplies here 600VDC
free service manual with full schematics and BOM

https://elektrotanya.com/lg_w1934s_flatron.pdf/download.html


in my shop I have VGA signal generator to maKE WORK EASY.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Circuit diagrams of many popular brand TVs and other devices are given.
Schematics can't be uploaded by this window.

If the back light is flickering, you can test and replace the LED in the back light from these links: https://how-to-repair.org/repair/lg-tv-repair-manual-pdf/lg-led-tv-no-backlights-32ln5300-32ln5310-32ln5700-voltage-test-troub/2pyuXwNkBMA.html and https://www.youtube.com/watch?v=_poWTEihIJU. You can download service manual of LG 60LB5900 on this link for reference: LG 60LB5900UV Service Manual free download schematics datasheets eeprom... Fix Led Backlights for TV or Monitor Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg...

it sounds like a blown capacitor in the unit somewhere.
here are some tools you are going to have to have: ohm meter,oscilloscope, signal generator, soldering equipment,
grounding equipment, diagrams, schematics, test points, layout of circuits,

Check the supply voltage to the backlight LED's. If it's too high and thus causing the LED's to go open a new panel will just become junk when powered on, and you may have damaged the replacement panel you already tried. To check the voltage just measure it at the cable end you connect to the panel. If no voltage bad motherboard. If too high still a motherboard issue, but you might be able to regulate it with a simple solid state voltage regulator.

Is the power LED flashing dimly? If so (or not) the likely problem is power board (marked BT-EFL32230W-A) LG part # 6871TPT303B is likely in need of replacement. There are no schematics available for this part and the part cost is around $100.00. It is rather difficult to get to this part as the entire works of this product is behind a heavy steel shield. be careful to re-attach the conductive tapes attached to this shield!

Good luck!

Is the power LED flashing dimly? If so (or not) the likely problem is power board (marked BT-EFL32230W-A) LG part # 6871TPT303B is likely in need of replacement. There are no schematics available for this part and the part cost is around $100.00. It is rather difficult to get to this part as the entire works of this product is behind a heavy steel shield. be careful to re-attach the conductive tapes attached to this shield!

Good luck!

Service manual from SAMs does not include a schematic of the power supply board

I suggest you google: Schematics for LG Shine CU720 cell phone and follow the links provided.
The answer is there. There may or may not be a cost for the Schematics.