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    #21
    Re: Soyo VT17N71

    PS. AFAIK, voltage regulators have a designation of I or IC. Transistors which can look like voltage regulators are marked with Q.

    Again, read the markings on the chip, look up its datasheet and you will get all the info.
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      #22
      Re: Soyo VT17N71

      Originally posted by retiredcaps
      PS. AFAIK, voltage regulators have a designation of I or IC. Transistors which can look like voltage regulators are marked with Q.

      Again, read the markings on the chip, look up its datasheet and you will get all the info.
      One more - An IC often has a designation of U

      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

        #23
        Re: Soyo VT17N71

        Originally posted by retiredcaps
        See yellow circled items. There may be more, but your pic isn't top down. It is slanted and hard to see.
        Ok, then for example:

        So the small one is this:http://www.fairchildsemi.com/ds/FQ/FQD13N06L.pdf

        so if interpret your message right, your telling me I should read 60v with the unit powered on? if not I should replace?

        Comment

          #24
          Re: Soyo VT17N71

          Yes, that is correct. However, you may want to double check the part number you are looking up.

          I'm not familar with this TV, but 60V DC sounds like a lot? The ones I'm used to seeing on LCD computer monitors is 2.5V, 3.3V or 5VDC.

          The only "TV" I have worked on is the Daytek and all the voltage regulators are in the 2.5V, 3.3V, and 5VDC range. So again, double check your part number.

          More experienced members should be able to tell you if 60V DC is normal on this board.

          Originally posted by bsweasel
          Ok, then for example:

          So the small one is this:http://www.fairchildsemi.com/ds/FQ/FQD13N06L.pdf

          so if interpret your message right, your telling me I should read 60v with the unit powered on? if not I should replace?
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            #25
            Re: Soyo VT17N71

            Its actually a computer monitor...I somehow stupidly posted it in the wrong forum.....I've double checked, its for sure FQD13N06L.

            Comment

              #26
              Re: Soyo VT17N71

              I have zero experience in board design/layout, but I find it strange that this monitor has an external power supply outputting 12V DC uses a 60V voltage regulator? Especially on the logic board?

              I have 2 LCD monitors (in stages of repair) that use external power supplies and I don't recall seeing any DC volts higher than the what is being output by the external power supply.

              Maybe one of the more experienced people can explain from a design theory point of view why such a higher voltage is needed?

              Originally posted by bsweasel
              Its actually a computer monitor...I somehow stupidly posted it in the wrong forum.....I've double checked, its for sure FQD13N06L.
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                #27
                Re: Soyo VT17N71

                uhm... 60V is what the mosfet he posted a link to (in post #23) is rated for.
                not a v-reg..

                Comment

                  #28
                  Re: Soyo VT17N71

                  WOW, Clearly, time for a beverage! And new glasses!

                  And I just saw toasty in another thread talking about how to test mosfets!

                  Heading to the fridge now ....

                  Originally posted by Scenic
                  uhm... 60V is what the mosfet he posted a link to (in post #23) is rated for.
                  not a v-reg..
                  Last edited by retiredcaps; 07-16-2010, 07:47 PM.
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                    #29
                    Re: Soyo VT17N71

                    I found the Vreg. its and AIC1084PM datasheet looks to rate it at a max of 3.3v, with power to it, with inverter disconnected it measures 8 volt with 1 probe on (pin 1) ground and the other on Vin (pin 3) and 1.25v on stub (pin 2). Now if I move my ground prob to the PCB ground (screw hole) Pin3 reads 10.x volts, pin2 reads 3.3volts. So why is one ground point reading differently than the other? Now off to read how to test that mosfet that gets HOT when it has the load of the inverter connected to it.

                    Comment

                      #30
                      Re: Soyo VT17N71

                      Originally posted by bsweasel
                      this MOSFET:http://www.fairchildsemi.com/ds/FQ/FQD13N06L.pdf
                      When tested with the diode setting on my meter appears to be conducting accross all 3 terminals no matter what...out of circuit....btw. And gets very hot in circuit under load....can I assume its crap and I need to find a replacement???

                      Comment

                        #31
                        Re: Soyo VT17N71

                        Originally posted by bsweasel
                        When tested with the diode setting on my meter appears to be conducting accross all 3 terminals no matter what...out of circuit....btw. And gets very hot in circuit under load....can I assume its crap and I need to find a replacement???
                        Yes.

                        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

                          #32
                          Re: Soyo VT17N71

                          Ok, so I took the MOSFET from the other board since I have 2 of these things.... It at least wasn't open or shorted. I got a .191 reading from it using the diode test on my meter. So I solder it in place. Power up the monitor and the Power LED is lit with both green and orange. The board does not appear to be heating up as before. But I don't get any picture and the back lights don't light up. This is getting frustrating. It appears to be a never ending trail of bad components on this thing.

                          PS. Could not find a source for replacement on this MOSFET. Anyone have a good cross reference source for it? After I figure out one of these I'll be wanting to repair its donor/twin and will need a new MOSFET for sure.
                          Last edited by bsweasel; 07-19-2010, 07:45 PM.

                          Comment

                            #33
                            Re: Soyo VT17N71

                            Originally posted by bsweasel
                            PS. Inverter boards have fuses just after input and both fuses on both inverters are fine
                            Please post a picture of the clear focused picture of the inverter board (top down view, both sides). We only have the logic board pics.
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                              #34
                              Re: Soyo VT17N71

                              Originally posted by bsweasel
                              Power up the monitor and the Power LED is lit with both green and orange. The board does not appear to be heating up as before.
                              Do you have a source plugged into the monitor?

                              Does the LED go green first and then orange? If yes, how long does it stay green before going orange? Once it goes orange, does it stay orange?

                              Can you see a picture if you shine a flashlight on it?
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                                #35
                                Re: Soyo VT17N71

                                Both green and orange light up at the same time. With or without a source. I don't see any picture with a light shining on it. Also the power button does not appear to do anything. LED lights when it comes on and stays on till I unplug it...

                                Comment

                                  #36
                                  Re: Soyo VT17N71

                                  http://www.simonlo.com.tw/download/s...0QDI17_noC.pdf

                                  This PDF shows a schematic and has crazy detail that is way out of my league.

                                  Inverter pictures attached.
                                  Attached Files

                                  Comment

                                    #37
                                    Re: Soyo VT17N71

                                    Originally posted by bsweasel
                                    This PDF shows a schematic and has crazy detail that is way out of my league.
                                    Any chance you found schematics of the logic board?
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                                      #38
                                      Re: Soyo VT17N71

                                      Originally posted by retiredcaps
                                      Any chance you found schematics of the logic board?
                                      I looked....google apparently does not know all!!

                                      Comment

                                        #39
                                        Re: Soyo VT17N71

                                        Originally posted by bsweasel
                                        Both green and orange light up at the same time. With or without a source.
                                        Sorry, I'm confused with the green and orange light up at the same time statement. Are you saying that the power LED (one LED) is green and orange?

                                        Or are there two LEDs and one is green and one is orange? If there are two LEDS, what are they?

                                        In fact, post a picture of the LED that is on.
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                                          #40
                                          Re: Soyo VT17N71

                                          Originally posted by retiredcaps
                                          Sorry, I'm confused with the green and orange light up at the same time statement. Are you saying that the power LED (one LED) is green and orange?

                                          Or are there two LEDs and one is green and one is orange? If there are two LEDS, what are they?

                                          Its a dual color LED. one LED that lights both green and orange. I'm guessing its green when power is on, and orange in sleep mode.

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