Comments on: How to test laptop screen inverter with a multimeter http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/ Do-It-Yourself laptop and notebook repair tips and tricks Thu, 11 Mar 2010 05:25:00 -0700 http://wordpress.org/?v=2.8.6 hourly 1 By: Hal Swinhart http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-20344 Hal Swinhart Wed, 22 Jul 2009 00:36:04 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-20344 I have a suggestion for you on a temporary "snooping" into inverter errors (working/not working) situations. I used an old non-working inverter and put my probes into the high voltage end of the inverter while it was not plugged into anything. I put my Amprobe 33XR-A on ac voltage and on an hp laptop, I read nearly 1 volt of ac. I then switched it over to Hz position and read 54 KHz! So, there! As a former RADAR tech in Uncle Sam's Air Force, I saved a lot of time to research that! Tear apart an old inverter board and make some probes to plug into the meter and use the mini transformer as a probe or as the ham guys used to call it a grid/dip meter to sniff out RF! You are welcome! I have a suggestion for you on a temporary “snooping” into inverter errors (working/not working) situations. I used an old non-working inverter and put my probes into the high voltage end of the inverter while it was not plugged into anything. I put my Amprobe 33XR-A on ac voltage and on an hp laptop, I read nearly 1 volt of ac. I then switched it over to Hz position and read 54 KHz! So, there! As a former RADAR tech in Uncle Sam’s Air Force, I saved a lot of time to research that! Tear apart an old inverter board and make some probes to plug into the meter and use the mini transformer as a probe or as the ham guys used to call it a grid/dip meter to sniff out RF!

You are welcome!

]]> By: Paul http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-17445 Paul Thu, 11 Jun 2009 10:33:46 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-17445 Hi, Great site, I now have a much better appreciation of my problem. But before I pull apart the wrong things, I thought I'd get an expert opinion... On my fiancee's Acer travelmate 2420 the backlight fails after a short while (< 1 minute). It can be turned back on with the close lid button but fails soon after (increasingly shorter periods). This only seems to be an issue under AC power. Everything works fine under batteries. Any suggestions? Thanks Hi,
Great site, I now have a much better appreciation of my problem. But before I pull apart the wrong things, I thought I’d get an expert opinion… On my fiancee’s Acer travelmate 2420 the backlight fails after a short while (< 1 minute). It can be turned back on with the close lid button but fails soon after (increasingly shorter periods). This only seems to be an issue under AC power. Everything works fine under batteries. Any suggestions?

Thanks

]]> By: Laptop Tech http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-16749 Laptop Tech Sun, 31 May 2009 23:50:51 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-16749 Chris, <blockquote>I am having an issue with my HP DV6000 screen. At times the brightness will decrease on it’s own. Sometimes the brighness changes so quickly the screen appears to be blinking. It will then stop and stay darker than the brightness setting.</blockquote> Maybe there is a problem with the power socket (DC-IN jack) and the laptop switches from the AC mode to battery mode? Can you reproduce the problem if you wiggle the power adapter tip inside the power socket? <blockquote>At other times the left side of the screen will be darker than the right.</blockquote> Could be the backlight lamp failure. <blockquote>I have found that physically moving the screen will sometimes fix the problem and the brightness will return to 100%.</blockquote> Could be connection related problem. Maybe the LCD cable is not making good connection with the screen or inverter. Try reconnecting the cable. Chris,

I am having an issue with my HP DV6000 screen. At times the brightness will decrease on it’s own. Sometimes the brighness changes so quickly the screen appears to be blinking. It will then stop and stay darker than the brightness setting.

Maybe there is a problem with the power socket (DC-IN jack) and the laptop switches from the AC mode to battery mode? Can you reproduce the problem if you wiggle the power adapter tip inside the power socket?

At other times the left side of the screen will be darker than the right.

Could be the backlight lamp failure.

I have found that physically moving the screen will sometimes fix the problem and the brightness will return to 100%.

Could be connection related problem. Maybe the LCD cable is not making good connection with the screen or inverter. Try reconnecting the cable.

]]> By: Chris http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-16745 Chris Sun, 31 May 2009 23:02:30 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-16745 Howdy, I am having an issue with my HP DV6000 screen. At times the brightness will decrease on it's own. Sometimes the brighness changes so quickly the screen appears to be blinking. It will then stop and stay darker than the brightness setting. At other times the left side of the screen will be darker than the right. Adjusting the brightness does not help. I have found that physically moving the screen will sometimes fix the problem and the brightness will return to 100%. Any ideas? Thanks Howdy,

I am having an issue with my HP DV6000 screen. At times the brightness will decrease on it’s own. Sometimes the brighness changes so quickly the screen appears to be blinking. It will then stop and stay darker than the brightness setting. At other times the left side of the screen will be darker than the right. Adjusting the brightness does not help. I have found that physically moving the screen will sometimes fix the problem and the brightness will return to 100%. Any ideas? Thanks

]]> By: Laptop Tech http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-16139 Laptop Tech Mon, 25 May 2009 06:04:24 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-16139 vinay, <blockquote>my laptop screen works good but one part of the screen on the right hand side does nt works like 80% of the screen working & 20% of the screen will be blank if i press on right side of the screen with my fingers firmly it works if i leave, it goes blank again is this can be corrected</blockquote> Sounds like a problem with the LCD screen and I've seen it before many time. Unfortunately, you cannot fix this problem. You'll have to replace the LCD screen. vinay,

my laptop screen works good but one part of the screen on the right hand side
does nt works like 80% of the screen working & 20% of the screen will be blank
if i press on right side of the screen with my fingers firmly it works if i leave,
it goes blank again is this can be corrected

Sounds like a problem with the LCD screen and I’ve seen it before many time. Unfortunately, you cannot fix this problem. You’ll have to replace the LCD screen.

]]> By: vinay http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-16131 vinay Mon, 25 May 2009 04:07:10 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-16131 hi laptop tech, plz help with my display screen, plz give some solutions. as my laptop screen works good but one part of the screen on the right hand side does nt works like 80% of the screen working & 20% of the screen will be blank if i press on right side of the screen with my fingers firmly it works if i leave, it goes blank again is this can be corrected plz help me what can i do for these hi
laptop tech, plz help with my display screen, plz give some solutions.
as my laptop screen works good but one part of the screen on the right hand side
does nt works like 80% of the screen working & 20% of the screen will be blank
if i press on right side of the screen with my fingers firmly it works if i leave,
it goes blank again is this can be corrected plz help me what can i do for these

]]> By: Kieran http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-15039 Kieran Tue, 12 May 2009 17:14:13 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-15039 Hi Laptop Tech, Thanks for the reply, i have checked out the close lid button and it all seems ok, also since last time, i sent back the new inverter incase it was faulty, and got a new one.. but there is still no joy ive tried the old screen and new screen with the new inverter, and its still the dark and barly readable screen. Is there anything else you can think of? is it possible it could be a software issue?? Thanks, Kieran Hi Laptop Tech,

Thanks for the reply, i have checked out the close lid button and it all seems ok,
also since last time, i sent back the new inverter incase it was faulty, and got a new one..
but there is still no joy
ive tried the old screen and new screen with the new inverter, and its still the dark and barly readable screen.
Is there anything else you can think of?
is it possible it could be a software issue??

Thanks,
Kieran

]]> By: Laptop Tech http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-13359 Laptop Tech Mon, 20 Apr 2009 07:57:28 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-13359 Kieran, <blockquote>I am having a bit of a problem with my laptop, first off i could bearly see the screen, so took it it was the backlight, so bought a new screen, now still have the same problem with new scree, so went and bought an inverter, but yet again same problem even with a new screen and inverter… totally lost here now</blockquote> Did you try the new inverter with the old screen? Also, if you have the lid close button, make sure the button move freely. If the button is dirty, it might stuck inside the case and the laptop "thinks" the display is closed. As a result it cuts off power from the inverter. Kieran,

I am having a bit of a problem with my laptop, first off i could bearly see the screen, so took it it was the backlight, so bought a new screen,
now still have the same problem with new scree, so went and bought an inverter, but yet again same problem even with a new screen and inverter… totally lost here now

Did you try the new inverter with the old screen?
Also, if you have the lid close button, make sure the button move freely. If the button is dirty, it might stuck inside the case and the laptop “thinks” the display is closed. As a result it cuts off power from the inverter.

]]> By: Kieran http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-13157 Kieran Fri, 17 Apr 2009 10:11:53 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-13157 Hi there, I am having a bit of a problem with my laptop, first off i could bearly see the screen, so took it it was the backlight, so bought a new screen, now still have the same problem with new scree, so went and bought an inverter, but yet again same problem even with a new screen and inverter... totally lost here now, can you think of what it could be? thank you so much Hi there,

I am having a bit of a problem with my laptop, first off i could bearly see the screen, so took it it was the backlight, so bought a new screen,
now still have the same problem with new scree, so went and bought an inverter, but yet again same problem even with a new screen and inverter… totally lost here now, can you think of what it could be? thank you so much

]]> By: Laptop Tech http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/comment-page-1/#comment-12841 Laptop Tech Mon, 13 Apr 2009 04:25:43 +0000 http://www.insidemylaptop.com/test-laptop-screen-inverter-with-multimeter/#comment-12841 alvin, <blockquote>my hp pav dv6000 laptop screen is not functioning well anymore.,sometimes when i turn it on, the screen is blank or black..but only the screen coz i can hear windows op is doing its usual stuf until the password screen..since i cant see anything,i hv to press the power button to turn it off to restart..</blockquote>It's hard to tell what's going on. I assume as you can hear Windows booting, the motherboard is working properly. I think your problem could be related to the video cable or LCD screen. alvin,

my hp pav dv6000 laptop screen is not functioning well anymore.,sometimes when i turn it on, the screen is blank or black..but only the screen coz i can hear windows op is doing its usual stuf until the password screen..since i cant see anything,i hv to press the power button to turn it off to restart..

It’s hard to tell what’s going on. I assume as you can hear Windows booting, the motherboard is working properly.
I think your problem could be related to the video cable or LCD screen.

]]>