HP W2207 Backlight Problem

Collapse
X
Collapse
 
  • Page of 3
  • Time
  • Show
Clear All
new posts
Previous 1 2 3 template Next
  • TVo
    Member
    • Jan 2011
    • 31
    #1

    HP W2207 Backlight Problem

    Hello!

    I have a W2207 that turns on for a bout 2 seconds then the backlight goes blank. I can still see the picture on the display, but it's without any light behind it.

    I have taken the board apart and have attached pictures. It doesn't look like any caps are bad, but I could be wrong. I have a feeling that it's the inverter, but I don't know how to pinpoint this.

    Disclaimer: I'm a bit of a noob when it comes to this type of repair, but I would really like to learn how. I may not know the proper vocabulary for a particular testing method, but I'm willing to do whatever I can to get this figured out. I have a lot of patience, so I hope I don't annoy anyone too much if I don't know what you're talking about if you tell me to try something.

    Without further ado, please feast your eyes upon my boards. Thanks in advance for any help!

    (The PowerBoard Back picture will not upload for some reason. I'll try a new picture later)
    Attached Files
    Tags: None
    • TVo
      Member
      • Jan 2011
      • 31
      #2
      Re: HP W2207 Backlight Problem

      Well, as I was getting pictures of the backlights in case they could be an issue, I found a broken CCFL! I don't know if it broke when I was removing it or if it was the cause the entire time, but I think that could be my issue!

      I have attached pictures of all the CCFL ends because there is a little bit of black on them. I have no idea if that means they are bad or if that's just how they are. I'll let you guys see it.

      Where is the best place to get replacement CCFLs for LCDs?

      Thanks!
      Attached Files

        Comment

        • alexanna
          Member
          • Mar 2010
          • 1346
          #3
          Re: HP W2207 Backlight Problem

          The very first thing I would suspect in this monitor,Would be a ccfl wiring issue.
          Do you have a known good ccfl you could substitute for testing?
          Al.
          Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

            Comment

            • TVo
              Member
              • Jan 2011
              • 31
              #4
              Re: HP W2207 Backlight Problem

              If you look at my almost immediate update, you should see that there indeed was a bad CCFL! I am considering replacing all of them, as there is some black on the non-broken ones too.

              Where is the best place to get replacement CCFLs?

                Comment

                • alexanna
                  Member
                  • Mar 2010
                  • 1346
                  #5
                  Re: HP W2207 Backlight Problem

                  Darn you beat me to it.
                  Al


                  I like ccflwarehouse.But there are others.
                  Al
                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                    Comment

                    • retiredcaps
                      Badcaps Legend
                      • Apr 2010
                      • 9271
                      #6
                      Re: HP W2207 Backlight Problem

                      Originally posted by TVo
                      I have a W2207 that turns on for a bout 2 seconds then the backlight goes blank. I can still see the picture on the display, but it's without any light behind it.
                      2 seconds to black can be

                      a) bad caps
                      b) bad inverter transformer
                      c) bad ccfls
                      d) bad ccfl wiring

                      All the above is explained in more detail starting with post #13 at

                      https://www.badcaps.net/forum/showthread.php?t=10419

                      Have a read through it and feel free to ask questions regarding the test procedures.

                      edit: Darn, I type too slow. Good job in figuring out it was c).
                      --- begin sig file ---

                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                      Please do not post inline and offsite as they slow down the loading of pages.

                      --- end sig file ---

                        Comment

                        • TVo
                          Member
                          • Jan 2011
                          • 31
                          #7
                          Re: HP W2207 Backlight Problem

                          Damn, you guys are fast!

                          I was checking out ccflwarehouse.com but I have no clue what type of CCFL to look for. Do I look on the old CCFLs for a part number or do I just guestimate?

                            Comment

                            • TVo
                              Member
                              • Jan 2011
                              • 31
                              #8
                              Re: HP W2207 Backlight Problem

                              Originally posted by retiredcaps
                              ...

                              https://www.badcaps.net/forum/showthread.php?t=10419

                              Have a read through it and feel free to ask questions regarding the test procedures.

                              ....
                              Thanks for that link! I have about 7 monitors (no joke) that need fixin. I'll start there. Should I start a new thread for an individual monitor I'm having problems with if I'm unable to diagnose from that post?

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271
                                  #9
                                  Re: HP W2207 Backlight Problem

                                  Originally posted by TVo
                                  I was checking out ccflwarehouse.com but I have no clue what type of CCFL to look for.
                                  Phone them. Members here say they are very helpful over the phone for these types of questions.
                                  --- begin sig file ---

                                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                  Please do not post inline and offsite as they slow down the loading of pages.

                                  --- end sig file ---

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271
                                      #10
                                      Re: HP W2207 Backlight Problem

                                      Originally posted by TVo
                                      Should I start a new thread for an individual monitor I'm having problems with if I'm unable to diagnose from that post?
                                      A new thread for each monitor to make it easier to follow and keep track of.

                                      If you are able to fix the monitors without our help, it would help others if you posted a post mortem or case study writeup with pictures of the fixed boards.
                                      --- begin sig file ---

                                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                      Please do not post inline and offsite as they slow down the loading of pages.

                                      --- end sig file ---

                                        Comment

                                        • retiredcaps
                                          Badcaps Legend
                                          • Apr 2010
                                          • 9271
                                          #11
                                          Re: HP W2207 Backlight Problem

                                          Originally posted by TVo
                                          Damn, you guys are fast!
                                          Apparently not fast enough. There are a number of very good people here who participate on a daily basis.

                                          BTW, it wouldn't hurt to check your inverter transformers to make sure they are okay since everything is apart.
                                          Sometimes 2 seconds to black is not just due to one bad component. It could be multiple problems.
                                          --- begin sig file ---

                                          If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                          We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                          Please do not post inline and offsite as they slow down the loading of pages.

                                          --- end sig file ---

                                            Comment

                                            • TVo
                                              Member
                                              • Jan 2011
                                              • 31
                                              #12
                                              Re: HP W2207 Backlight Problem

                                              Thanks again very much for the info. I plan on writing out a guide for each of these particular models for people like me who had no idea where to start when fixing these things.

                                              I ordered some CCFLs and they will be here in about 10 days. I plan on testing the inverter transformers as well and see if there are other issues there.

                                              I'll post back when I for sure find out what the problem was, and I'll post a link to my guide which will hopefully have very neat pictures and a disassembly (since when I looked there were NONE for this particular model, and it was a huge pain figuring out how to get off the backplate.)

                                              Thanks again for help, and I'll report back when it's workin!

                                                Comment

                                                • TVo
                                                  Member
                                                  • Jan 2011
                                                  • 31
                                                  #13
                                                  Re: HP W2207 Backlight Problem

                                                  Well, bad news.

                                                  After replacing the CCFLs, I still have the same 2 seconds to black problem. I would like to test the transformers, but I'm honestly not sure which parts are the transformers and which pins I need to test.

                                                  Any advice on how to test this particular monitor's transformer? I read up on the post about the basics to do to test 2 seconds to black, but I didn't get quite enough info to test the transformers. (this post: https://www.badcaps.net/forum/showthread.php?t=10419 )

                                                  Any help is greatly appreciated!

                                                    Comment

                                                    • Scenic
                                                      o.O
                                                      • Sep 2007
                                                      • 2642
                                                      • Germany
                                                      #14
                                                      Re: HP W2207 Backlight Problem

                                                      no help from me on the transformers, but the caps in the first few pics look like Su'scon.. replace on sight in my book..

                                                        Comment

                                                        • TVo
                                                          Member
                                                          • Jan 2011
                                                          • 31
                                                          #15
                                                          Re: HP W2207 Backlight Problem

                                                          They are Su'scon... Damn, I really wish I had an ESR meter. Can't justify it quite yet. I'll take that into consideration, after I've had a go at testing the transformer, just to check. What about that big fatty Cap? Are those readily available?

                                                            Comment

                                                            • jetadm123
                                                              Badcaps Legend
                                                              • Feb 2010
                                                              • 2169
                                                              #16
                                                              Re: HP W2207 Backlight Problem

                                                              Looking at your photo, it looks like each inverter transformer has two pins (marked 7 and 8) on their secondaries, which feed a pair of ccfl's. Can't tell if there are more pins on the secondaries (which is why we usually ask for a photo of the bottom of the board). Assuming 2 pins and with power off and your meter set to resistance, measure across pins 7 and 8 of each inverter. If the difference is greater than 3%, then you may have a problem.
                                                              Last edited by jetadm123; 02-07-2011, 03:23 PM.

                                                                Comment

                                                                • TVo
                                                                  Member
                                                                  • Jan 2011
                                                                  • 31
                                                                  #17
                                                                  Re: HP W2207 Backlight Problem

                                                                  Bah, I had meant to attach a photo of the back. I think it error'd out last time.

                                                                  Here's a back photo.
                                                                  Attached Files

                                                                    Comment

                                                                    • retiredcaps
                                                                      Badcaps Legend
                                                                      • Apr 2010
                                                                      • 9271
                                                                      #18
                                                                      Re: HP W2207 Backlight Problem

                                                                      1) Put your multimeter on 2000 ohms (if manual). Power off and unplug the lcd. Wait 2 minutes.

                                                                      2) Measure the 2 red dots. Report ohms.

                                                                      3) Do the same for yellow dots.
                                                                      Attached Files
                                                                      Last edited by retiredcaps; 02-07-2011, 04:05 PM.
                                                                      --- begin sig file ---

                                                                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                                                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                                                      Please do not post inline and offsite as they slow down the loading of pages.

                                                                      --- end sig file ---

                                                                        Comment

                                                                        • jetadm123
                                                                          Badcaps Legend
                                                                          • Feb 2010
                                                                          • 2169
                                                                          #19
                                                                          Re: HP W2207 Backlight Problem

                                                                          Go ahead and measure across the 2 pins (7 and 8) of each inverter transformer and report your findings.

                                                                            Comment

                                                                            • retiredcaps
                                                                              Badcaps Legend
                                                                              • Apr 2010
                                                                              • 9271
                                                                              #20
                                                                              Re: HP W2207 Backlight Problem

                                                                              Originally posted by TVo
                                                                              After replacing the CCFLs, I still have the same 2 seconds to black problem.
                                                                              You should check your work with a known good single ccfl and rule out a bad install/wiring. That is, unplug one ccfl at a time and substitute the good one (you don't have to disassemble anything, just stretch the cable to the good ccfl).
                                                                              --- begin sig file ---

                                                                              If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                                                              We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                                                              Please do not post inline and offsite as they slow down the loading of pages.

                                                                              --- end sig file ---

                                                                                Comment

                                                                                Previous 1 2 3 template Next

                                                                                Related Topics

                                                                                Collapse
                                                                                • triplefour
                                                                                  UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
                                                                                  by triplefour
                                                                                  this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
                                                                                  i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
                                                                                  unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
                                                                                  according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
                                                                                  09-13-2023, 10:43 PM
                                                                                • DanPoka
                                                                                  Guide me through repairing a Dell p2210f LCD ccfl backlight monitor
                                                                                  by DanPoka
                                                                                  I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
                                                                                  Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
                                                                                  This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...
                                                                                  02-15-2025, 05:05 AM
                                                                                • Mgiffune
                                                                                  Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
                                                                                  by Mgiffune
                                                                                  I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

                                                                                  I ordered a supposedly ‘new' Tcon board this time, and                                                                                  ...
                                                                                  06-09-2024, 10:28 AM
                                                                                • Ierwin
                                                                                  Samsung UE60KU6079 backlight okay mainboard responsive, no picture, no sound
                                                                                  by Ierwin
                                                                                  Hello everyone,
                                                                                  Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
                                                                                  The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
                                                                                  He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
                                                                                  I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
                                                                                  Anyway I still fully expect that there has been something seriously damaged...
                                                                                  05-13-2025, 03:31 PM
                                                                                • KYBOSH
                                                                                  Samsung UN55MU8000 - Backlight But No Picture Problem
                                                                                  by KYBOSH
                                                                                  Hello all

                                                                                  I pick this up free as a repair project for the holidays.
                                                                                  The original symptom was power cycling after 3-4 seconds with a single red light flash.

                                                                                  To remedy this I went through and unplugged each component 1x1 and discovered that when the FFC cables were disconnected the backlights stayed on and the TV did not reboot.

                                                                                  I tried remove one or the other to see which side of the display was causing the issue (expecting to see half a picture to show) but didn't see anything. But the boot loop only appears when the top FFC cable (right side...
                                                                                  12-21-2022, 12:42 AM
                                                                                • Loading...
                                                                                • No more items.
                                                                                Working...