Resistor question

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • 1supertech
    Badcaps Veteran
    • Apr 2012
    • 384
    • USA

    #21
    Re: Resistor question

    Originally posted by budm
    Check the voltage on CN902 with nothing else connected to the power supply board and see if you do get any reading. Are you hearing any ticking sound from the power supply board?
    No power no sounds

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Resistor question

      There are 3-pin devices mounted on small heat sinks in the inverter circuit section, please take the RESISTANCE reading on 3 legs combination.
      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

      • selldoor
        Slow Learner
        • Dec 2010
        • 7870

        #23
        Re: Resistor question

        Just wonder what you are using for ground when testing the socket?
        If you look on the back of the board you can see the bottom two pins on the socket are ground. So working as budm suggests with only the power supply connected, test on the back of the board with black probe on bottom pin
        then with meter on vDC20 test each pin on the socket with the red probe.

        While you are there put the red probe also onto each side of F902 and see if any voltage there.
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • 1supertech
          Badcaps Veteran
          • Apr 2012
          • 384
          • USA

          #24
          Re: Resistor question

          Power fluctuates on socket the same on each side of fuse F902
          Last edited by 1supertech; 02-01-2014, 06:55 AM.

          Comment

          • 1supertech
            Badcaps Veteran
            • Apr 2012
            • 384
            • USA

            #25
            Re: Resistor question

            Originally posted by budm
            there are 3-pin devices mounted on small heat sinks in the inverter circuit section, please take the resistance reading on 3 legs combination.
            q207
            b&c 0.02
            c&e 0.00
            b&e 0.02

            q206
            b&c 0.01
            c&e 0.00
            b&e 0.02

            q203
            g&s 0.00
            g&d 0.02
            d&s 0.02

            Comment

            • philliesfan30m
              Badcaps Veteran
              • Aug 2013
              • 542
              • USA

              #26
              Re: Resistor question

              it fluctuates? you mean each pin reads a different voltage or just 1 pin?

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #27
                Re: Resistor question

                Originally posted by 1supertech
                Power fluctuates on socket the same on each side of fuse F902
                ok but you need to tell us what the voltage is on each pin eg

                pin1 5-7 fluctuating
                pin2 o
                pin3 9.1 -12.4 fluctuating and so on

                Fuse both sides 15v -17.3v fluctuating
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • selldoor
                  Slow Learner
                  • Dec 2010
                  • 7870

                  #28
                  Re: Resistor question

                  Originally posted by 1supertech
                  q207
                  b&c 0.02
                  c&e 0.00
                  b&e 0.02

                  q206
                  b&c 0.01
                  c&e 0.00
                  b&e 0.02

                  q203
                  g&s 0.00
                  g&d 0.02
                  d&s 0.02
                  looks like they are all shorted - may have to take off and re test
                  one at a time.
                  can you post the part numbers
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment

                  • 1supertech
                    Badcaps Veteran
                    • Apr 2012
                    • 384
                    • USA

                    #29
                    Re: Resistor question

                    Originally posted by selldoor
                    ok but you need to tell us what the voltage is on each pin eg

                    pin1 5-7 fluctuating
                    pin2 o
                    pin3 9.1 -12.4 fluctuating and so on

                    fuse both sides 15v -17.3v fluctuating
                    pin1 0
                    pin2 0
                    pin3 036-169

                    Comment

                    • philliesfan30m
                      Badcaps Veteran
                      • Aug 2013
                      • 542
                      • USA

                      #30
                      Re: Resistor question

                      there are 8 pins on cn902 how do you only have 3 pins?

                      Comment

                      • philliesfan30m
                        Badcaps Veteran
                        • Aug 2013
                        • 542
                        • USA

                        #31
                        Re: Resistor question

                        put multimeter on dc voltage and check each pin with red probe on pin and black on chassis

                        Comment

                        • 1supertech
                          Badcaps Veteran
                          • Apr 2012
                          • 384
                          • USA

                          #32
                          Re: Resistor question

                          Originally posted by philliesfan30m
                          there are 8 pins on cn902 how do you only have 3 pins?
                          oops test power socket
                          will retest

                          Comment

                          • philliesfan30m
                            Badcaps Veteran
                            • Aug 2013
                            • 542
                            • USA

                            #33
                            Re: Resistor question

                            are the pins listed on the board? if so list that next to the readings

                            Comment

                            • 1supertech
                              Badcaps Veteran
                              • Apr 2012
                              • 384
                              • USA

                              #34
                              Re: Resistor question

                              Originally posted by selldoor
                              ok but you need to tell us what the voltage is on each pin eg

                              pin1 5-7 fluctuating
                              pin2 o
                              pin3 9.1 -12.4 fluctuating and so on

                              Fuse both sides 15v -17.3v fluctuating
                              Retest
                              PIN
                              1 3-67v
                              2 3-67v
                              3 3-67v
                              4 3-67v
                              5 3-67v
                              6 3-67v
                              7 3-67v
                              8 3-67v

                              Comment

                              • 1supertech
                                Badcaps Veteran
                                • Apr 2012
                                • 384
                                • USA

                                #35
                                Re: Resistor question

                                Originally posted by selldoor
                                looks like they are all shorted - may have to take off and re test
                                one at a time.
                                can you post the part numbers
                                All tested good no shorts on DCA55

                                Comment

                                • philliesfan30m
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 542
                                  • USA

                                  #36
                                  Re: Resistor question

                                  1 of them has to be a ground. how can you get the same voltage on every pin?

                                  Comment

                                  • 1supertech
                                    Badcaps Veteran
                                    • Apr 2012
                                    • 384
                                    • USA

                                    #37
                                    Re: Resistor question

                                    Originally posted by philliesfan30m
                                    1 of them has to be a ground. how can you get the same voltage on every pin?
                                    I tested from ground on power socket to all pins CN902 fluctuates 3-67 v normally I don't get
                                    power to CN902 with mainboard connected
                                    Last edited by 1supertech; 02-01-2014, 09:04 AM.

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #38
                                      Re: Resistor question

                                      q207
                                      b&c 0.02
                                      c&e 0.00
                                      b&e 0.02

                                      q206
                                      b&c 0.01
                                      c&e 0.00
                                      b&e 0.02

                                      q203
                                      g&s 0.00
                                      g&d 0.02
                                      d&s 0.02

                                      Are they in Ohms, K Ohms, M Ohms? They do not look good.
                                      The voltage readings of 67V can only be from using the wrong ground ref. point. You should use one of the negative leg of the filter caps on the secondary side as the ground ref.
                                      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

                                      • 1supertech
                                        Badcaps Veteran
                                        • Apr 2012
                                        • 384
                                        • USA

                                        #39
                                        Re: Resistor question

                                        1- 0 k
                                        2- 0 k
                                        3- .99k-18.94k
                                        4- 0-.98k
                                        5- 23.5.98k
                                        6-4.91-5.30k
                                        7-0k
                                        8-0k
                                        all reading fluctuating except 0
                                        millimeter was set to 20k

                                        Comment

                                        • selldoor
                                          Slow Learner
                                          • Dec 2010
                                          • 7870

                                          #40
                                          Re: Resistor question

                                          It looks to me that this is getting very muddled.
                                          1supertech - you must say if you are not sure what we are saying.

                                          I can only assume English is not your first language and you dont understand
                                          Or you dont understand the electronic terms or both?

                                          If you can confirm that we can make allowances and try and explain better
                                          what you have to do.
                                          Last edited by selldoor; 02-01-2014, 04:38 PM.
                                          Please upload pictures using attachment function when ask for help on the repair
                                          http://www.badcaps.net/forum/showthread.php?t=39740

                                          Comment

                                          Related Topics

                                          Collapse

                                          • TinkerTron
                                            Schematic vs. Reality: Where Are the Resistors on My Sharp Clock Radio? Model FY-70CH
                                            by TinkerTron
                                            Hey everyone,

                                            I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.

                                            Instead, here's what's been bugging me so far:
                                            The schematic...
                                            03-06-2025, 02:03 PM
                                          • artvandalai
                                            What resistor ohm will work better to repair this waterpik?
                                            by artvandalai
                                            The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor https://www.youtube.com/watch?v=_J7_rV7ui1Y
                                            01-05-2025, 04:10 PM
                                          • chth96
                                            Is it okay to replace 1/2 watt resistor with 1 watt resistor in AC/DC adapter?
                                            by chth96
                                            I have purchased an 100-240v AC/5v 2a DC adaptor from aliexpress,and a month ago It smelled burning when I plugin it powerstrip.
                                            Since then, This AC/DC adaptor have been out of order.
                                            But A few days ago,I replace 0.5 watt resistor with 1 watt resistor(1ohm) in this adapter.
                                            After replacing resistor,It succeed to recharge all of android phone.And When I measure voltage on the two pins of USB port,It shows 5.5v
                                            Is it okay to replace 1/2 watt resistor with 1 watt resistor in AC/DC adapter?
                                            And Is there any possibility that it will suddenly explode as well as to be out...
                                            12-03-2023, 04:40 AM
                                          • flat-earther
                                            Hoover FM216LI cordless vacuum refuses to charge
                                            by flat-earther
                                            I have a Hoover FM216LI cordless vacuum which isn't charging its internal battery.

                                            I opened up the unit, and it has 6x Samsung ICR18650-22P cells connected in series.
                                            5 cells were at about 3.3-3.1V. one was at 2.4V, so I assumed this cell was bad that's why the vacuum wasn't charging so I replaced it with another 18650, but after that the problem still persists, the vacuum turns on a bit and then cuts out since the batteries are empty.

                                            So I think the over discharged battery wasn't the culprit, it was a symptom of the unit not being able to charge its batteries....
                                            06-06-2025, 03:14 AM
                                          • badcap111
                                            Xiaomi mi 9T missing resistor
                                            by badcap111
                                            Hi, while trying to replace a broken screen connector on the motherboard, I knocked off a resistor next to the connector, and the resistor vanished. I have tried to find out the value of the resistor by looking at the schematics, but I cannot find the value. The ID of the resistor, or what you should call it, is R6400.

                                            I don't know if the resistor is necessary for the phone to function, and the connector is still not soldered on to motherboard. I have contacted Xiaomi and asked them if they know the value, but they want a proof of purchase, which I don't have.

                                            Is...
                                            08-07-2023, 10:42 AM
                                          • Loading...
                                          • No more items.
                                          Working...