Announcement

Collapse
No announcement yet.

Intermittant power on - 42" Viore plasma

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Intermittant power on - 42" Viore plasma

    I have a 42" Viore Plasma (PDP42V18HA), 4 years old. When I hit the power switch, I hear the power supply clicks, the screen gets slightly brighter but it does not turn on, the LED goes green. Then it either turns off immediately or After about 4 minutes it turns off (LED out). I unplug it and try again. After a 2-3 cycles of this, and waiting the 4 minutes, it will power on and work perfectly fine. I took the back off and looked at the power supply, didn't see anything obvious. I looked at all the other visible boards, nothing obvious. I was tempted to replace the power supply but wasn't sure if a control board could create the same problem. Based on my symptoms, can anyone say if the power supply is my likely source?? Bulging caps: When caps bulge, is it significant and obvious or subtle for the trained eye??
    Tags: None
    #2
    Re: Intermittant power on - 42" Viore plasma

    Originally posted by Stevedak View Post
    I have a 42" Viore Plasma (PDP42V18HA), 4 years old. When I hit the power switch, I hear the power supply clicks, the screen gets slightly brighter but it does not turn on, the LED goes green. Then it either turns off immediately or After about 4 minutes it turns off (LED out). I unplug it and try again. After a 2-3 cycles of this, and waiting the 4 minutes, it will power on and work perfectly fine. I took the back off and looked at the power supply, didn't see anything obvious. I looked at all the other visible boards, nothing obvious. I was tempted to replace the power supply but wasn't sure if a control board could create the same problem. Based on my symptoms, can anyone say if the power supply is my likely source?? Bulging caps: When caps bulge, is it significant and obvious or subtle for the trained eye??
    It depends on your definition of 'obvious'. Some months back a gentleman was having problems with a monitor. 'The caps look perfect' according to him. After several posts that produced stranger and stranger information I suggested he attach a picture of the board in question. It wasn't a very good picture, but I quickly identified nearly a half-dozen caps with bulging tops. Replacing them solved his problem.

    While I would NEVER suggest you are as undiscerning as that gentleman, read the links in my signature and attach a picture of the power supply.

    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

      #3
      Re: Intermittant power on - 42" Viore plasma

      Pictures of power supply
      Attached Files

      Comment

        #4
        Re: Intermittant power on - 42" Viore plasma

        More power supply pics.
        Attached Files

        Comment

          #5
          Re: Intermittant power on - 42" Viore plasma

          Originally posted by Stevedak View Post
          Pictures of power supply
          Most of your pics are blurry, but from what I can tell the caps look okay. That doesn't mean anything though.

          If PlainBill asks for more photos, for best picture quality and clarity take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focused pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.
          --- 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

            #6
            Re: Intermittant power on - 42" Viore plasma

            Usually I prefer one good clear picture over many blurry ones. From what I can tell, there are no obvious bulging caps. The one on the corner of the first picture in the second group looks like there might be a slight bulge.

            As retiredcaps suggested, I'd like a single picture from directly overhead with resolution of as close to 2000 x 2000 as possible. Under those conditions any bulging is very obvious.

            One problem is some manufacturers have mastered the technique of building caps that fail without visible evidence. Another problem is there are additional supplies on some of the other boards which can also cause problems.

            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

              #7
              Re: Intermittant power on - 42" Viore plasma

              These pictures should be clearer. On the back side of the board, there is a dark spot at a solder joint. The component is an amp, mounted to a heat sink. can't see the part number of the amp. THe power supply number is USP440M-42LP
              Attached Files

              Comment

                #8
                Re: Intermittant power on - 42" Viore plasma

                THe picture of the back of the board shows a dark spot at some solder joints. The soldered component isn't an amp, it is a MR5060.

                Thanks for all the help.

                Comment

                  #9
                  Re: Intermittant power on - 42" Viore plasma

                  Hey i have the same problem with my same tv and i was cunfused because i also dont see any bulging caps.

                  Comment

                    #10
                    Re: Intermittant power on - 42" Viore plasma

                    can anyone help me identify any blown caps please help me.
                    Attached Files

                    Comment

                      #11
                      Re: Intermittant power on - 42" Viore plasma

                      Originally posted by Stevedak View Post
                      I have a 42" Viore Plasma (PDP42V18HA), 4 years old. When I hit the power switch, I hear the power supply clicks, the screen gets slightly brighter but it does not turn on, the LED goes green. Then it either turns off immediately or After about 4 minutes it turns off (LED out). I unplug it and try again. After a 2-3 cycles of this, and waiting the 4 minutes, it will power on and work perfectly fine. I took the back off and looked at the power supply, didn't see anything obvious. I looked at all the other visible boards, nothing obvious. I was tempted to replace the power supply but wasn't sure if a control board could create the same problem. Based on my symptoms, can anyone say if the power supply is my likely source?? Bulging caps: When caps bulge, is it significant and obvious or subtle for the trained eye??
                      I know this is an old post, but if possible, can you tell me if you were able to repair this board? If so, what was replaced or repaired. Thanks.

                      Comment

                        #12
                        Re: Intermittant power on - 42" Viore plasma

                        Originally posted by Stevedak View Post
                        I have a 42" Viore Plasma (PDP42V18HA), 4 years old. When I hit the power switch, I hear the power supply clicks, the screen gets slightly brighter but it does not turn on, the LED goes green. Then it either turns off immediately or After about 4 minutes it turns off (LED out). I unplug it and try again. After a 2-3 cycles of this, and waiting the 4 minutes, it will power on and work perfectly fine. I took the back off and looked at the power supply, didn't see anything obvious. I looked at all the other visible boards, nothing obvious. I was tempted to replace the power supply but wasn't sure if a control board could create the same problem. Based on my symptoms, can anyone say if the power supply is my likely source?? Bulging caps: When caps bulge, is it significant and obvious or subtle for the trained eye??
                        I know this is an old post, but if possible, can you tell me if you were able to repair this board? If so, what was replaced or repaired. Thanks.

                        Comment

                          #13
                          Re: Intermittant power on - 42" Viore plasma

                          Hi
                          Identifying bad caps by just looking to them can be deceiving.In my experience i have found some bad capacitors with high ESR value, even though, they looked perfect, no bulge or whatsoever.So i recommend to get en ESR meter from ebay to test them out of circuit.
                          Another advice.Capacitors are not always the origin of failure in spms. Just test other components, like diode, Mosfets...

                          Comment

                          Previous template Next
                          Working...
                          X