HP W2207 No Backlight

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Triumphantcc
    New Member
    • Dec 2010
    • 5
    #1

    HP W2207 No Backlight

    I pulled the inverter out of an HP W2207 Monitor. Inverter id is: ILPI-029 Rev. A
    490891400101R E131175
    I suspected bad caps(Suscon) so I replaced them all. Monitor worked for 3 hrs. and went back to the same problem. (No Backlight). I checked all the caps and none had failed. I used a Fluke 16 which I find reliable for testing these caps. Any ideas on what else would fail. I suspect the Schottky Barrier Rectifier could be possible. But Ohming it out it tested O.K.
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: HP W2207 No Backlight

      Originally posted by Triumphantcc
      Monitor worked for 3 hrs. and went back to the same problem. (No Backlight).
      1) Please post clear focused pictures of your all boards (top down view - both sides of the board) using the manage attachments feature. Please do not post inline or offsite.

      2) A picture of your boards may help others see a "hot spot" or somethiing that is causing the lcd to shut off. I believe there are 3 boards in this monitor: power, logic, and inverter.

      3) Check for poor soldering as well.

      4) One suggestion. Try lowering the brightness and contrast settings to 35/35 and see if the monitor stays on longer?

      5) The Fluke 16 is a fine meter and does a good job of checking for capacitance, but it doesn't check for ESR.

      6) What brand and series did you use for replacement caps?
      Last edited by retiredcaps; 01-18-2011, 01:13 PM. Reason: numbered everything to make it easier to read and answer
      --- 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

        • Triumphantcc
          New Member
          • Dec 2010
          • 5
          #3
          Re: HP W2207 No Backlight

          I used Nichicon Caps I purchased from overseas. The board is a 4 lamp power inverter with a amplifier circuit built in for the speakers on the monitor.
          You can see an exact picture of this board here. http://mylcdboard.com/2010_11/ZD100044.html I am not familiar with uploading pictures to BadCaps Forum and I don't want to violate rules. It said to not load photos inline with posts???? I will be glad to send you pictures if you will give me an email address. I doubt the caps will fail ESR because they are brand new. However, If you suggest it; I will replace everyone of them again and see if it cures the problem. I have suspicions about the Transistor C1815GR located at Q801 & IC803. And the Schottky Barrier Rectifier (D79 SP1040C) Located at D805.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: HP W2207 No Backlight

              Originally posted by Triumphantcc
              I used Nichicon Caps I purchased from overseas.
              Nichicon like others make a variety of caps or series. Each series is designed for specific characteristics. Some Nichicon series are not low esr caps. What series did you use?

              If you bought these caps from ebay, you may have gotten fake caps as well.

              You can see an exact picture of this board here.
              We always want to see your board. Looking at someone's board is like a surgeon operating on you with someone else's xrays.

              I am not familiar with uploading pictures to BadCaps Forum and I don't want to violate rules. It said to not load photos inline with posts????
              The manage attachments button is right below the "post icons" section. Just scroll down.

              Posting inline pictures slows everything down. This is an example of the pics we want

              https://www.badcaps.net/forum/showpo...94&postcount=1
              --- 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

                • Triumphantcc
                  New Member
                  • Dec 2010
                  • 5
                  #5
                  Re: HP W2207 No Backlight

                  Please Tell me how to create and post thumbnails for pictures? i will attach pictures of the board. Thanks

                    Comment

                    • Dgtech
                      E. Technician
                      • Apr 2009
                      • 1462
                      • Steeler
                      #6
                      Re: HP W2207 No Backlight

                      Originally posted by retiredcaps

                      The manage attachments button is right below the "post icons" section. Just scroll down.

                      https://www.badcaps.net/forum/showpo...94&postcount=1

                      This is how you post the thumbnail pictures.

                      As for your failure, If I changed the caps and the system worked for a little bit (3 hours), I'd think either you didnt really fix the problem or something else was ready to die and it did. Just a thought.
                      The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                        Comment

                        • alexanna
                          Member
                          • Mar 2010
                          • 1346
                          #7
                          Re: HP W2207 No Backlight

                          I want to make sure were understanding your problem
                          Do you see any activity of backlights at all? Even a brief flash?
                          Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                            Comment

                            • WTAstronaut
                              New Member
                              • Nov 2011
                              • 1
                              #8
                              Re: HP W2207 No Backlight

                              I normally do not like to resurrect threads that have been dead for a while, but I have this monitor with the exact same issue. I can take the requested photos if someone would be willing to look at them.

                                Comment

                                • PlainBill
                                  Badcaps Legend
                                  • Feb 2009
                                  • 7034
                                  • USA
                                  #9
                                  Re: HP W2207 No Backlight

                                  Originally posted by WTAstronaut
                                  I normally do not like to resurrect threads that have been dead for a while, but I have this monitor with the exact same issue. I can take the requested photos if someone would be willing to look at them.
                                  That's the usual process.

                                  PlainBill
                                  For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                  Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                    Comment

                                    • Redion
                                      Senior Member
                                      • Nov 2010
                                      • 59
                                      • Canada
                                      #10
                                      Re: HP W2207 No Backlight

                                      Hi

                                      I have the same power supply. The problem is almost the same.

                                      When turned ON the coloring is all reddish, but then in few seconds the back light shuts down. Picture is still on the screen when I look carefully at it.

                                      No caps are blown.
                                      Since no one attached the pictures I uploaded couple of mine.
                                      Attached Files

                                        Comment

                                        • retiredcaps
                                          Badcaps Legend
                                          • Apr 2010
                                          • 9271
                                          #11
                                          Re: HP W2207 No Backlight

                                          Originally posted by Redion
                                          When turned ON the coloring is all reddish, but then in few seconds the back light shuts down.
                                          You might be experiencing 2 seconds to black. A reddish or pinkish glow indicates the ccfls are dying.

                                          Details and more explained in posts #19 and #20 at

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

                                          Pictures of bad ccfls (pinkish) are also in the above link.
                                          --- 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

                                            • Redion
                                              Senior Member
                                              • Nov 2010
                                              • 59
                                              • Canada
                                              #12
                                              Re: HP W2207 No Backlight

                                              Checked the bulbs by inserting one at the time and found the one that gives reddish light! After that I took my LCD panel apart. and found the bad light. Take a look at the pic.

                                              Thanks alot!


                                              Now, where do I buy a replacement bulb?
                                              Attached Files
                                              Last edited by Redion; 01-21-2012, 06:40 PM.

                                                Comment

                                                • jayoung
                                                  Senior Member
                                                  • May 2011
                                                  • 172
                                                  #13
                                                  Re: HP W2207 No Backlight

                                                  I purchased some replacement ccfl's from www.CCFLwarehouse.com through e-Bay not too long ago for a 19" monitor that I fixed. I didn't have any issues with them.

                                                  http://www.ebay.com/itm/250474949765#ht_1047wt_1163

                                                  Several members on the forums have used them.

                                                    Comment

                                                    • retiredcaps
                                                      Badcaps Legend
                                                      • Apr 2010
                                                      • 9271
                                                      #14
                                                      Re: HP W2207 No Backlight

                                                      Replacement tutorial at

                                                      http://www.ccflwarehouse.com/lasotu.html

                                                      It is fragile work and you must go slow. If you are easily frustrated or are tempted to use a hammer, you can buy them pre harnessed/assembled from the same site. Obviously it cost more for this option.
                                                      --- 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
                                                          #15
                                                          Re: HP W2207 No Backlight

                                                          Originally posted by Redion
                                                          Now, where do I buy a replacement bulb?
                                                          Answer was inferred in the same URL in post #20.

                                                          d) Replacing a CCFL is a delicate operation. See "Lamp Soldering Tutorial" at http://ccflwarehouse.com/lasotu.html to see what steps are involved. CCFLs can be sold "bare" or "pre-harnessed". The latter is easier to replace and install, but is more expensive.
                                                          --- 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

                                                            • lilmax4ever
                                                              New Member
                                                              • Sep 2016
                                                              • 1
                                                              • Dominican Republic
                                                              #16
                                                              Re: HP W2207 No Backlight

                                                              R521 ?

                                                                Comment

                                                                • alexhdez
                                                                  New Member
                                                                  • Jan 2012
                                                                  • 1
                                                                  #17
                                                                  Re: HP W2207 No Backlight

                                                                  Originally posted by lilmax4ever
                                                                  R521 ?
                                                                  4-band resistor: orange, orange, black, gold. 33 ohms, 5%, 1/2 watt

                                                                    Comment

                                                                    Previous template Next

                                                                    Related Topics

                                                                    Collapse
                                                                    • 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
                                                                    • Zilicon
                                                                      NEWSYNC B27F165 MONITOR HAS NO BACKLIGHT. board no: JY85QS_UPH_LS_R10.3
                                                                      by Zilicon
                                                                      Greetings everyone.
                                                                      Please I need help with the above monitor.

                                                                      Below is the summary of what happened and what I have done:

                                                                      The monitor started by turning off 2 seconds after it was turned on. It displayed with a backlight when it turned on. However, the standby light remains on after it is turned off on its own, I have to press the power button again to turn it on, but it will go back to standby after 2 seconds.

                                                                      The backlight driver IC is 0b3350cp.

                                                                      I applied a 370k SMD resistor on the CMP pin which is pin 6, while the other...
                                                                      11-07-2023, 09:12 AM
                                                                    • turmix
                                                                      AOC U34G3XM, new monitor, black screen with backlight on, possible shortcircuit during dissassembly
                                                                      by turmix
                                                                      Hello, I'm working on a new deskmod pc project and have a problem with my monitor, an AOC U34G3XM, well, I may have bricked it.

                                                                      The monitor was dismanteled and the separate parts parts integrated in the desk. the screen panel alone is on the upper part, and main board/video board + power board on the back of the desk (not enough place on the cover to fit it)
                                                                      At first everything was working smoothly, then I decided to change the connexion between the video board and the screen for a longer one. Still working fine

                                                                      During another reassembly, I made a mistake, and...
                                                                      01-29-2024, 03:48 AM
                                                                    • 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
                                                                    • lostone
                                                                      Looking for help with a Viewsonic VP230mb where the backlight comes on only momentarily
                                                                      by lostone
                                                                      Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.

                                                                      First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
                                                                      When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...
                                                                      05-19-2024, 11:40 AM
                                                                    • Loading...
                                                                    • No more items.
                                                                    Working...