KDS 715S monitor is black and will not turn on

it is not just a monitor there is PC there,
no PC stated, they work as TEAM. ok.
that being said, 14year old monitors.
no not SAFE but power saver mode,
also called SLEEP MODE to save power losses, (Energy Star and GREEN )
the manual covers this. 9227-AC1 (you missed typing fully this)
'Lenovo ThinkVision L171 9227-AC1 17" LCD Monitor.' AC1 is non USA. this is very old monitor and all have this OLD style internal sleep mode. covered in the manual. circa 2005 old. most this old are dead now from dead CCLF back lamp tubes. but the manual shows push menu key on front then in the OSD MENUS WE THEN FIND sleep timer (clock) Inside the monitor,
http://www.manualsdir.com/manuals/165841/lenovo-l171.html if the PC is silent the monitor goes to sleep. if the PC goes to sleep wiggle the mouse or hit space bar until PC wakes up. if sleep is bad in PC turn sleep off. if PC is dead, then that is wrong. test the monitor in 2nd PC if monitor works there the monitor is ok, and PC1 is bad.

Hello, Kpruetz is almost impossible to find the issue without testing and measure your device because of that problem beginning in the computer, not in the monitor; like firmware, filters or other components, I sorry about that. If you have guaranty range you can contact the customer services, then they can solve the issue https://support.lenovo.com/us/en/?menu-id=Technical_Support

ok , we've answer that question here , vast endless times.
all old monitors before magic year 2010 even go to sleep
all by them selves to save the pathetic, CCFL tubes insid it.

so learn to use the monitors OSD screen.
push the menu button there(real button)
see that? now turn off sleep.
i will now read the manual to you.
3 seconds latter (manualsdir.com)

page 33
turn off the time and all sleep function INSIDE the monitor
amazing no? RTM still works in the year 2018...

https://www.manualslib.com/download/71500/Hp-W2338h.html

its a very very old monitor,so old in fact , you PC then had no sleep modes. so its inside the monitor, this old
so push the menu key on front of monitor and turn off
sleep/powersaver. ,
no the manual is only, you do know fixya is not HP right?
nor are we COMPAQ
did you leave off works in front if the 1501, HP made types with just that 4 digits.

Compaq 1501
https://www.manualslib.com/manual/30085/Compaq-Tft-1501.html
L1501 and TFT-1501
read the service tag on the monitor and see the real full name
then post that for 10x better answers even the book.

The high pitch sound is coming from the inverter. It is faulty and needs to be repaired or replaced. The inverter supplies high voltage to the CCFL lamp, this lamp gives the backlight to the LCD so you can see the LCD images.
Check out LCD parts for parts, service and DIY info. use this link :-
www.lcdparts.net

Hello,

You have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of he monitor. If you are good at electronics repair/soldering you can usually fix he problem. Check out a few pictures on my web site www.ccl-la.com/badcaps.htmYou can take the back cover off your monitor and look for the bad parts,replace any that look like the pictues and your monitor should work fine. The capacitors do need to be installed with the correct + and -connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $35 plus shipping. I hope this helps, if so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com
Over 21 years of computer and printer support/repair

if you look closely can you see a very dark image on the screen? your problem is usually the result of the backlight on its way out, these are very hard to replace so you will need to take it to a profesional, in most cases it is cheeper to buy a new screen.

Hi publicworker,

I had a similar problem whereas my monitor went to sleep mode after a few minutes. I'm running an HP LP 2065 in dual mode with another HP flat screen. However, I did resolve the issue after resetting the output settings.

How to do that:

• right mouse click on the desktop
• select graphic options
• output to
• extended desktop

Maybe some changings/modification will help you too.

Stefan

we have here , like 1000s of black screens posted here now.
all the same all with CCFL lamps. that die. same solution.
older monitors have a power saver mode inside it,
push the front button called menu, then see OSD menu
then find and turn off power saver.
if the OSD fails to show up; the CCFL are dead.
this monitor was made in 2007, and 2010 is the starting year
for ending the usage of CCFL (starting on large screens working to small)

im reading your manual for you now, free.
page 4 tells you it has CCFT (T mean Tube, L means lamp)
same same.
https://www.manualslib.com/manual/1110533/Hp-W2007.html?page=4#manual

now lets look at the page on saver. power

page 7, (its on by default ) oops !
https://www.manualslib.com/manual/1110533/Hp-W2007.html?page=7#manual


turn saver OFF
see next page 8 and turn DDC ON.
see sleep timer and turn that all off.
if you push factory reset, it the problem begins again.
bad. for you.

https://www.manualslib.com/manual/1110533/Hp-https://www.manualslib.com/manual/1110533/Hp-W2007.html?page=8#manual

you can in fact download the whole manual.
for free. here. the site on the internet in this regard.

all old HP monitors are made for old PC 2000 year.
your PC is not 17 years old i bet.
so all this old saver stuff is now WRONG.
(all this is old school Energy Star , malarkey, )

Problem of monitor sreen going black in 5-10 secs is generally dry solder joints around the inverter transformer on the inverter PCB.