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    Need your help Identifying these capacitors/resistors

    Hello all, I am new to this forum and my Google searches lead me here. My name is Jeremy and I am repairing some bad caps on a 91 Mitsubishi 3000 GT ECU. I started working on this ECU because the notorious caps on these boards went out on me and leaked onto its neighboring components. So I need to replace two resistors/capacitors in these two pics that I found on the internet of my same exact ECU. Mine were corroded beyond repair. The first pic is the reddish brown little rectangle chip with two silver ends and no markings, and has C35in white ink next to it on the circuit board. The second is the one is at the C4 marking on board. It is a small and rectangular but is black with one end marked in silver, and has the markings "j6r" I believe. I have searched all over and even called Digikey and talked to the tech there but he wasn't much help. So i figured someone out there has to know what these are. There has to be a way of identifying these, even if i cant get the exact same ones maybe there is a substitute that i can use? Any info would be greatly appreciated! I know a little about electronics but there is a point where my knowledge ends.

    Thanks,

    Jeremy



    #2
    Re: Need your help Identifying these capacitors/resistors

    the first pic is a smd capacitor,the second pic is a smd diode,have you tried searching the board number to find a schematic?
    fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

    ----------------------------------------------
    please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

    Comment


      #3
      Re: Need your help Identifying these capacitors/resistors

      yeah i tried but no luck. allot of things came up but maybe i had the wrong search criteria. The Mitsubishi number on the board is E331B991B. Thanks for the info, but by looking at them there is no way to identify their ratings? Or something that would get me close enough that it wouldn't effect the performance?

      Comment


        #4
        Re: Need your help Identifying these capacitors/resistors

        This is what i get when i search for a schematic

        https://www.google.com/search?hl=en&...qi=&aql=&gs_l=

        Comment


          #5
          Re: Need your help Identifying these capacitors/resistors

          have you tried here ?http://elektrotanya.com/ put the appliance your working on and also try the board numbers
          fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

          ----------------------------------------------
          please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

          Comment


            #6
            Re: Need your help Identifying these capacitors/resistors

            Just tried that and it returned both with 0 results

            Comment


              #7
              Re: Need your help Identifying these capacitors/resistors

              OK see the capacitor looks like it is connected to the leg of that Ic. You could search for a data sheet for that ic and see is it gives an example circuit which might help you work out what it does and or the value. You could also see if one of the other ic`s are the same and if they have a capacitor on the same leg you could then measure this to see what its value is.
              Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

              How to resize your pictures guide click HERE
              Retiredcaps Ideal post example click HERE

              Comment


                #8
                Re: Need your help Identifying these capacitors/resistors

                I had an old computer that controlled the SRS system on the car and found one of the small reddish brown capacitors like the one in this pic. Being that it was made the same time as this board and by Mitsubishi would it be ok to assume that using the same size as are on my ECU that they would have the same value? From the research I have done I found that if they measure the same across and width in MM and were the same color code I.E reddish/brown that they most likely are the same value. And also i know for sure that they came from the same manufacture. So if this will work then all i need is the black on with "j6r" printed on the top. Yes it does connect to the end leg of that I.C The number on the I.C is "MA7815B" and has the Mitsubishi symbol next to it. I have looked for a data sheet like you suggested but nothing came up definitive. Maybe I am searching with the wrong criteria? If anyone has any info on this I.C or where I might look, I sure would appreciate it.

                Thanks again

                Jeremy

                Comment


                  #9
                  Re: Need your help Identifying these capacitors/resistors

                  I found this website but nothing for my MA7815B I.C
                  http://search.datasheetcatalog.net/key/MA7815B

                  Comment


                    #10
                    Re: Need your help Identifying these capacitors/resistors

                    The first one is an MLCC, the second may be a tantalum or electrolytic SMD cap. They're both likely to be for power decoupling. If the ECU works fine without replacing them it may be OK.

                    Comment


                      #11
                      Re: Need your help Identifying these capacitors/resistors

                      The MLCC (Multi Layer Ceramic Capacitor) usually failed shorts circuit due to cracks on the body. The second one in the picture is also capacitor. I would check to see if the reistance between the two legs are less than 50 Ohms or so. Then also check the DC reading on it. Otherwise you can remove them and measure the value but be careful on the MLCC since you can easily damage it during removal or re-installation. Also do not flex the PCB too much.
                      Attached Files
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment


                        #12
                        Re: Need your help Identifying these capacitors/resistors

                        Hi I think the ic will be a 7815b family the first letters are probably the manufacturer.

                        I have two data sheets - first doesnt seem to have any application data the second does
                        I see it shows capacitors and perhaps budm will decipher it - I am no good on circuit diags.
                        Attached Files
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment


                          #13
                          Re: Need your help Identifying these capacitors/resistors

                          If it it true that it is just a 15v linear regulator, then you can verify that it shoudl have at least one capacitor between pin 1 and Ground, another cap between pin 3 and ground, pin 2 should be connected to ground. you can see that in the data sheet. You can also measure the voltage on pin 1 and pin 3.
                          It will be good if you can draw the phyical connection for us.
                          Last edited by budm; 04-16-2012, 08:55 AM.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment


                            #14
                            Re: Need your help Identifying these capacitors/resistors

                            Originally posted by budm View Post
                            The MLCC (Multi Layer Ceramic Capacitor) usually failed shorts circuit due to cracks on the body. The second one in the picture is also capacitor. I would check to see if the reistance between the two legs are less than 50 Ohms or so. Then also check the DC reading on it. Otherwise you can remove them and measure the value but be careful on the MLCC since you can easily damage it during removal or re-installation. Also do not flex the PCB too much.


                            The problem is my ECU does not have these capacitors on it. The pic is one off the internet that I found that matches mine. My ECU was rebuilt by some hack company in Florida back in 06 and I bought this ECU from them back then trying to diagnose a problem. Long story short I lost interest and recently took it to my mechanic to find out the problem and it turns out there's an open ground circuit inside the ECU. So I opened it up and decided to replace capacitors that usually leak. They only replaced 2 of the 4 that go bad and they removed these two capacitors which I discovered by comparing these pics to my ECU. So I have no way to measure the resistance. Like I mentioned in one of my above posts, I took apart an old SRS ECU and found and exact match to the reddish brown one in the pic. I'm assuming that it has the same values as the on in the pic? Since it was made from Mitsubishi also, what chances are there that it would work? If it does then I am only in need of the j6r capacitor. So there is no way to find out the specs of this "j6r" capacitor huh? I have Google searched it with no info. Even called Digikey and talked to tech.

                            You also asked if I could draw out the circuit for you. Now I'm not a total novice but how detailed of a diagram are you looking for?

                            Thanks again for your help, I have been getting no where fast

                            Comment


                              #15
                              Re: Need your help Identifying these capacitors/resistors

                              So there are empty pads for these two missing capacitors? The main key point is that if they are connected to the 7815 regulator or not.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment


                                #16
                                Re: Need your help Identifying these capacitors/resistors

                                Ya.......ill take a pic and post it. Its prety bad. and to think I paid 160 bucks for a piece of Sh*#@

                                Comment


                                  #17
                                  Re: Need your help Identifying these capacitors/resistors

                                  Here it is, its a pic from my phone so its not that great. Hopefully you can see what they did in the pic. Again, this is not my doing.......The company that did this is called Auto Computer Exchange in Hollywood Florida. but the sticker on the casing said it was rebuilt by an independent re-builder and had 1-877-489-4659. I called them and told them what I found but sense its out of the 1 year warranty they wouldn't do a thing except charge me 50 bucks to take a look at it. Yeah right, they can kiss my A$$ What craftsmanship ehh? I strongly advise anyone to reconsider before using this company.

                                  Comment


                                    #18
                                    Re: Need your help Identifying these capacitors/resistors

                                    Holy cow! And they are professional repair tech?
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment


                                      #19
                                      Re: Need your help Identifying these capacitors/resistors

                                      Ya they claim they are. I dint know who I was buying from i guess, this was back in 06. I have searched a bunch on this topic on the net and found allot of people encountered the same thing. What these hack company's do is pop open the cases, look for the leaking capacitors and only replace those, like mine had 2 that had been replaced and 2 that were the factory mitsubishi caps. I could tell because it looked like a 5 year old soldered it and the solder barely stuck to the board. When I heated the solder up to de-solder the caps, it melt and flowed into the holes like it normally does. They might as well used bubble gum. So any sugg here? I bought the cap from Digikey to replace them and all ready did that, now I just need to fix this mess some how. If its possible? I didnt have a good multimeter so I bought this one from the Shack and it looks like its should be good for what it is.

                                      http://www.ebay.com/itm/RadioShack-4...-/120878562253

                                      Comment


                                        #20
                                        Re: Need your help Identifying these capacitors/resistors

                                        Well, since you know how to solder, I would try using through hole parts, 0.1uf/25v ceramic cap for the brown cap (no polarity needed), the black polarized cap (more likely to be Tantalum type) on, I would suggested 22uf 25v or 50v (observe the polarity). Try and see if it will work. The problem you may have is that the liquid may have eaten away some traces that you may not see if they are under the component.
                                        By the way, did this board ever work with the missing parts?
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

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