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    Philips 42" Plasma 42PF7320

    Hello all.

    This is my first post here.

    I've been lurking this forum off and on for a while. This site helped me fix a samsung LCD monitor in the past. THANKS BADCAPS!! Anyway, I have a Philips Plasma 42PF7320 that I picked up for next to nothing and I assumed that it was the same problem as many others have experienced because the previous owner told me it comes on for a few minutes then shuts off, red light... etc. In my head I thought, "bad caps on the power supply board."

    Well, I got the back off the TV last night and all the caps on the entire TV look fine (I know that doesn't mean they are) but I haven't had a chance to check any of them with a meter. Thank you again fellas for the link to the service manual. This should help me out quite a bit.

    I am not much of an electronics troubleshooter, but I know basic electronics, how to solder, etc. If replacing the caps on the power supply board doesn't fix the problem, what is my next general step in troubleshooting? Keep in mind I'm poor, so just throwing (multiple) boards at the problem isn't something I can afford to do.

    Thanks in advance for any help you fine folks can give me.


    #2
    Re: Philips 42" Plasma 42PF7320

    Originally posted by dmitt25 View Post
    If replacing the caps on the power supply board doesn't fix the problem, what is my next general step in troubleshooting?
    I suggest before recapping, that you read everything on this board that has "philips plasma" for the search string. It will come up with about 30 hits.

    From those search results, it should give you a good idea of the information you may need to provide or where to download service manuals, etc.
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    Comment


      #3
      Re: Philips 42" Plasma 42PF7320

      I'll second what retiredcaps said, and add a little more information.

      First of all, the service manual for that TV is readily available at http://elektrotanya.com.

      Second, Philips is very good about telling you about the cause of the shutdown by flashing the standby led. The service manual explains how to decode the pattern.

      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


        #4
        Re: Philips 42" Plasma 42PF7320

        Thanks for the quick replies.

        I am in the process of going through all the posts pertaining to philips plasma's right now.

        I reinstalled the power supply board as suggested to get the error code off the front LED. Powered it up and waited for the fault. When the tv shuts down (on it's own) I can hear a relay trying to kick over 2 or 3 times and then it quits. The front LED indicates 5 blinks then repeats. According to the service manual (if I've decoded correctly), this is error code 5 right?

        "(5) VIPER does not boot P Stby μP PNX8550 / Protection + Error blinking"

        I'll go back to reading.

        Comment


          #5
          Re: Philips 42" Plasma 42PF7320

          Originally posted by dmitt25 View Post
          Thanks for the quick replies.

          I am in the process of going through all the posts pertaining to philips plasma's right now.

          I reinstalled the power supply board as suggested to get the error code off the front LED. Powered it up and waited for the fault. When the tv shuts down (on it's own) I can hear a relay trying to kick over 2 or 3 times and then it quits. The front LED indicates 5 blinks then repeats. According to the service manual (if I've decoded correctly), this is error code 5 right?

          "(5) VIPER does not boot P Stby μP PNX8550 / Protection + Error blinking"

          I'll go back to reading.

          Brief translation: The standby processor tries to start the Viper processor, which does not respond.

          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


            #6
            Re: Philips 42" Plasma 42PF7320

            So, the VIPER is the board with the CableCARD slot in it right? The tuner board?
            Last edited by dmitt25; 08-13-2010, 10:17 AM.

            Comment


              #7
              Re: Philips 42" Plasma 42PF7320

              Originally posted by dmitt25 View Post
              So, the VIPER is the board with the CableCARD slot in it right? The tuner board?
              Well, sorta. That entire board is usually called the 'Small Signal Board' by Philips. Samsung calls it the 'Misc Main Board' (to distinguish it from the Logic Main Board, the Y Main Board, Z Main Board, etc).

              It contains several processors including the Standby and the Viper, a Scalar chip, DC-DC converters, the tuners, some inputs and control for all inputs, as well as the sound and video processors. It's a busy little board.

              There are extensive schematics for the board. I'd suggest checking the outputs of the DC-DC converters and the supply before replacing the Small Signal Board.

              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


                #8
                Re: Philips 42" Plasma 42PF7320

                Thanks so much PlainBill! I sure appreciate you taking the time to explain this stuff to a noob like myself I'll have time this weekend to break out the meter and check out the Power Supply board more thoroughly. Although truth be told I have practically no idea what I'm doing hahaha.

                Comment


                  #9
                  Re: Philips 42" Plasma 42PF7320

                  Quick question:

                  Can I power up the power supply with it removed from the TV? Just wondering if it will even power up without any load. Reason I ask is, where the TV is and where I will be, are two different places, and I don't want to lug the TV around if I don't have to.

                  Thanks

                  Comment


                    #10
                    Re: Philips 42" Plasma 42PF7320

                    Dmitt, do you have the service manual for that 42PF7320?
                    I have a problem with a 50PF7320 and in that service manual also 42PF7320 error codes is covered but (5) is another problem in my documentation.
                    If you have a manual for your 42", would you mind share it with me? In case there are a Samsung powersupply board in yours? (which I'm in need of)
                    Last edited by PowerAmpFreak; 08-13-2010, 03:10 PM. Reason: Clumsy written

                    Comment


                      #11
                      Re: Philips 42" Plasma 42PF7320

                      Originally posted by PowerAmpFreak View Post
                      Dmitt, do you have the service manual for that 42PF7320?
                      I have a problem with a 50PF7320 and in that service manual also 42PF7320 error codes is covered but (5) is another problem in my documentation.
                      If you have a manual for your 42", would you mind share it with me? In case there are a Samsung powersupply board in yours? (which I'm in need of)
                      http://elektrotanya.com/?q=showresul...at2=schematics

                      This should get you in the ballpark, at least to the right site

                      I misread your comments, however I got a copy of the service manual for my TV off this site so graciously linked by PlainBill.

                      hope this helps.
                      Last edited by dmitt25; 08-13-2010, 03:28 PM. Reason: Misread

                      Comment


                        #12
                        Re: Philips 42" Plasma 42PF7320

                        Originally posted by dmitt25 View Post
                        Quick question:

                        Can I power up the power supply with it removed from the TV? Just wondering if it will even power up without any load. Reason I ask is, where the TV is and where I will be, are two different places, and I don't want to lug the TV around if I don't have to.

                        Thanks
                        You're going to have to work with the power supply in the TV.

                        Note that most of the connectors on the power supply are labeled. Here's my recommended procedure.

                        Hook up the black lead of a DMM to chassis ground. Use the red lead to check each of the voltage lines that link the power supply to the Small signal board. If all of those voltages are good, check the outputs of the DC-DC converter. It's part of the small signal board.

                        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


                          #13
                          Re: Philips 42" Plasma 42PF7320

                          Heya guys back again with an update:

                          So this weekend I took PlainBill's advice and checked all the voltages on everything I could find to check. Everything is within specs as far as I can tell.

                          I was starting to get discouraged when my neighbor (an electronics tech) thought I should try cooling boards down to see if the TV would stay on longer.

                          I borrowed a high pressure ducted squirrel fan from him and proceeded to spend the next 4 hours whittling down the variables.

                          After much experimenting I have determined that the nexperia chip (apparently the same style chip found in x-boxes that cause the "red ring of death") on the back of the SSB is overheating and causing the TV to go into protect mode. When I told my neighbor about my findings and he saw the chip he said he was pretty certain that was the culprit.

                          To be more specific about my troubleshooting: I initially ran the TV with zero cooling to get a baseline for the amount of time it would stay on. Approximately 2 minutes. Multiple tries. Then I directed a steady stream of cold air (quarantined off from any other boards to eliminate unnecessary variables) at a particular area on the SSB and was able to get the TV to stay on for 35 minutes before I got tired of testing it. Then I took the air off and less than 2 minutes later, the TV went into protect mode. To prove this wasn't a fluke, I did this same test 3 more times. First trying without air, TV lasts 2 mins. Then with air 30 mins (till I got tired). Air off, tv dies in 2 minutes or less.

                          I'd upload pictures, but I don't have that feature enabled.


                          I intend to put some aluminum heat sinks on this chip and see if that helps. I also have access to a CNC laser at work so I will be taking the back in to cut some holes for a couple 120mm 12v computer fans (as silent as I can find)

                          I'll report back with my findings! Thanks for your help PlainBill!

                          Comment


                            #14
                            Re: Philips 42" Plasma 42PF7320

                            Wow, I cant beleive this! I picked up a Philips 37pf7320A this past weekend from a guy on CL for $40. This TV has the same exact problem, same exact manual, same exact blinking 5x LED. I have been probing this board for an hour now before I found this thread by searching keywords : VIPER + PHILIPS. I'll have to see whether or not that same chip above is overheating in mine.
                            The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                            Comment


                              #15
                              Re: Philips 42" Plasma 42PF7320

                              Very strange that the:
                              42PF7320 = Plasma
                              37PF7320A = LCD

                              Anyways, I will start a new thread with my problem if the failure isnt exact with Dmitt25's set - to keep from mixing up threads.
                              The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                              Comment


                                #16
                                Re: Philips 42" Plasma 42PF7320

                                Another Update:

                                Ok guys, the new board came today. So I immediately took the stupid blue jelly-foam crap off the viper chip and the other large chip on the back of the SSB. I applied a thin layer of Artic Silver 5 thermal paste on the chips and then installed a couple aluminum heat sinks I got off Ebay that I had to mill down because they were about 1/16" too tall to fit in the cage. Once I got that done, I put everything back together and fired it up. Works like a champ!

                                Well, except for one thing.. I may have been sent/bought the wrong board. The picture isn't centered in the middle of the screen. It looks great, just offset to the right. Changing the format allows me to fill the whole screen, but it's still not centered. Is there a way to fix this with this board or am I screwed?

                                Thanks!

                                Comment


                                  #17
                                  Re: Philips 42" Plasma 42PF7320

                                  it looks as if maybe installing the latest firmware might remedy this? I'll try that and let you all know what happens.

                                  Comment


                                    #18
                                    Re: Philips 42" Plasma 42PF7320

                                    Originally posted by dmitt25 View Post
                                    Another Update:

                                    Ok guys, the new board came today. So I immediately took the stupid blue jelly-foam crap off the viper chip and the other large chip on the back of the SSB. I applied a thin layer of Artic Silver 5 thermal paste on the chips and then installed a couple aluminum heat sinks I got off Ebay that I had to mill down because they were about 1/16" too tall to fit in the cage. Once I got that done, I put everything back together and fired it up. Works like a champ!

                                    Well, except for one thing.. I may have been sent/bought the wrong board. The picture isn't centered in the middle of the screen. It looks great, just offset to the right. Changing the format allows me to fill the whole screen, but it's still not centered. Is there a way to fix this with this board or am I screwed?

                                    Thanks!
                                    Sounds like the board you bought came out of a set with a different panel. Read the service manual carefully to see how to change this.

                                    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


                                      #19
                                      Re: Philips 42" Plasma 42PF7320

                                      Back again...

                                      So I updated the firmware and it doesn't appear to have helped anything.

                                      I think you're exactly right PlainBill. I think this new board was out of a different sized set. It looks like it's fairly easy to change in the SAM, but I can't make out which code I'm supposed to use. Maybe you can help?

                                      Here is the code list from the manual:

                                      Display Display
                                      Option HEX Type Size Vertical Resolution

                                      000 00 PDP SDI HD V3 42” 768p
                                      001 01 PDP SDI HD V3 50” 768p
                                      002 02 PDP FHP ALIS 1024i 42” 1024i
                                      003 03 LPL 30” 768p
                                      004 04 LPL: 37” 768p
                                      005 05 LPL 42” 768p
                                      006 06 SHARP 32” 768p
                                      007 07 PDP SDI SD V3 42” 480p
                                      008 08 PDP FHP ALIS 1024i 37” 1024i
                                      009 09 LCOS XION - 720p
                                      010 0A LCD AUO 30” 768p
                                      011 0B LCD LPL 32” 768p
                                      012 0C LCD AUO 32” 768p
                                      013 0D LCD SHARP 37” 768p
                                      014 0E LCD LPL HD 42” 1080p
                                      015 0F PDP SDI SD 37” 480p
                                      016 10 PDP FHP ALIS 1080i 37” 1080i
                                      017 11 PDP FHP ALIS 580i 42” 1080i
                                      018 12 PDP FHP 55” 768p
                                      019 13 LCOS VENUS - 720p
                                      020 14 LCOS VENUS - 1080p
                                      021 15 LCD LPL 26” 768p
                                      022 16 LCD LPL scanning BL. 32” 768p
                                      023 17 LG SD 42” 480p
                                      024 18 PDP SDI SD V4 42” 480p
                                      025 19 PDP SDI HD V4 42” 768p
                                      026 1A PDP FHP HD A2 42” 1024i
                                      027 1B PDP SDI HD V4 50” 768p
                                      028 1C LCD Sharp full HD 37” 1080p

                                      My guess is "000" for the code. I don't wanna be wrong though!
                                      Last edited by dmitt25; 08-20-2010, 11:12 PM.

                                      Comment


                                        #20
                                        Re: Philips 42" Plasma 42PF7320

                                        Final Update:

                                        code 000 was the ticket! Looks beautiful and I'm very pleased. Thanks all for your much needed assistance!

                                        I have a new TV now! hahaha

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