HY9 is a Zener for ? voltage

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • capwizard
    Badcaps Legend
    • Jun 2016
    • 1991
    • USA

    #1

    HY9 is a Zener for ? voltage

    Hello, I am not try to give you guys A hard time.

    I am troubleshooting A INSIGNIA NS-29D310NA15, One board TV (PCB: TP.MS3393.PB703), under $100 TV, I ordered the PCB at US $34.42.

    Yes, I can change the PCB and fix this TV in 5 mins, but I want to fix the original problem otherwise Im gonna learn nothing.

    Question : HY9 is a Zener for ? voltage

    I use Haier 32" service manual fix this INSIGNIA 29" TV. From pic2, my guess is (HY9) a sot-23 9v Zener!

    PS: I can use poormans LED tester to test another good parts (zener).............
    Attached Files
    Last edited by capwizard; 03-07-2017, 09:55 AM.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: HY9 is a Zener for ? voltage

    Well, if you at least start a new thread in the TV section with make, model, pictures and any service manual you have plus what is the TV or the power supply board not doing will be a good start.
    i doubt that it will be 9V ZENER since it is for clamping the running Voltage from the SMPS transformer.
    What is the UB101? You can get the spec sheet and look at the MAX VCC the IC can handle then you will have some idea what the Zener Voltage will be.
    BTW, why do you think that Zener bad? It is for protection so the the circuit will work without it.
    it sounds like you are just looking all over the places without trying to narrowing down to the suspected section of the circuit, if we know what Voltages have or not have then you can narrow down the search. I will not even try to removing all throwing in the parts yet at this point since you can create new problems.
    Last edited by budm; 03-07-2017, 10:03 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

    • capwizard
      Badcaps Legend
      • Jun 2016
      • 1991
      • USA

      #3
      Re: HY9 is a Zener for ? voltage

      Yes I will, but now I need to know what the part HY9 means ?
      Last edited by capwizard; 03-07-2017, 10:06 AM.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: HY9 is a Zener for ? voltage

        Originally posted by capwizard
        Yes I will but now I need to know what the part HY9 is ?
        Why?
        What is the required VCC to run that SMPS IC? IC spec? Is it shorted or low resistance reading?
        read my post 2.
        Last edited by budm; 03-07-2017, 10:06 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

        • capwizard
          Badcaps Legend
          • Jun 2016
          • 1991
          • USA

          #5
          Re: HY9 is a Zener for ? voltage

          SMPS IC : UB101 It is the LD7573
          https://www.badcaps.net/forum/showthread.php?t=60813

          Recommended Operating Conditions

          -----------------------------Item Min. Max. Unit
          Supply Voltage Vcc (LD7535) 11 25 V
          Supply Voltage Vcc (LD7535A) 11 18 V
          Switching Frequency 50 130 KHz
          Startup Resistor Value 1.2 4.4 MΩ
          Last edited by capwizard; 03-07-2017, 10:16 AM.

          Comment

          • gabiz_ro
            Senior Member
            • Mar 2011
            • 167
            • Romania

            #6
            Re: HY9 is a Zener for ? voltage

            Such kind of zenner protection will have voltage,few or more,greater than UB101 start-up voltage and lower than UB101 maxim Vcc Voltage.
            Ex.
            Start-up Vcc is 10V
            Max Vcc is 18V
            Then I use 15V zenner diode to protect IC

            That was just an example.
            Not related to IC presented here.
            Apologise.
            Until I post my message,have few phone calls,looking for smd code etc and messages 2-3-4-5 appears.
            Last edited by gabiz_ro; 03-07-2017, 10:41 AM.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: HY9 is a Zener for ? voltage

              Well, I wish you stay with one thread instead starting the new thread working on the same board.
              You do not want a repeat of this: https://www.badcaps.net/forum/showthread.php?t=60332, do you?
              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

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: HY9 is a Zener for ? voltage

                UVLO (ON) is 16V typ, not 10V.
                10V is the shutdown Voltage once the IC is running when it reaches the start up Voltage (16V) then as long as the Vcc does not go down to 10V then it will be running, or above 21V for A' version, 28V for non 'A'
                Read the Application information and look at Fig 3.
                Max Vcc is not 18V:

                Recommended Operating Conditions
                Item Min. Max. Unit
                Supply Voltage Vcc (LD7535) 11 25 V
                Supply Voltage Vcc (LD7535A) 11 18 V
                Switching Frequency 50 130 KHz
                Startup Resistor Value 1.2 4.4 MΩ

                OVP is:
                LD7535 --- 28.0V ± 1.5V.
                􀁺 LD7535A --- 21.0V ± 1.5V.


                Max VCC is:
                Absolute Maximum Ratings
                Supply Voltage VCC 30V

                Info are there in the spec sheet.
                Last edited by budm; 03-07-2017, 10:28 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

                • capwizard
                  Badcaps Legend
                  • Jun 2016
                  • 1991
                  • USA

                  #9
                  Re: HY9 is a Zener for ? voltage

                  gabiz_ro Good idea ! Maybe I can omit it, I try now see what's happening!

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: HY9 is a Zener for ? voltage

                    Originally posted by capwizard
                    gabiz_ro Good idea ! Maybe I can omit it, I try now see what's happening!
                    Please read the spec sheet, that info given is wrong, it is not 10V.
                    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

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: HY9 is a Zener for ? voltage

                      Originally posted by gabiz_ro
                      Such kind of zenner protection will have voltage,few or more,greater than UB101 start-up voltage and lower than UB101 maxim Vcc Voltage.
                      Ex.
                      Start-up Vcc is 10V
                      Max Vcc is 18V
                      Then I use 15V zenner diode to protect IC
                      Sorry, that are wrong information, please read the spec sheet again. Please figure out how to read the spec sheet.
                      Last edited by budm; 03-07-2017, 10:31 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

                      • gabiz_ro
                        Senior Member
                        • Mar 2011
                        • 167
                        • Romania

                        #12
                        Re: HY9 is a Zener for ? voltage

                        Until I post new message,new messages appears.
                        At that time didn't know about what IC is in discussion.

                        It was just an example.

                        All values are changed when you know about what IC is talking.

                        You may note that I say greater than UB101 start-up voltage,but at that time didn't know what is UB101

                        You may omit that zenner and all still working fine in some cases.But risky,IC could be damaged.
                        Last edited by gabiz_ro; 03-07-2017, 10:40 AM.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: HY9 is a Zener for ? voltage

                          Post 2: 'BTW, why do you think that Zener bad? It is for protection so the the circuit will work without it."
                          I also already ask if the Zener is bad or not.
                          Last edited by budm; 03-07-2017, 10:39 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

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: HY9 is a Zener for ? voltage

                            Originally posted by capwizard
                            gabiz_ro Good idea ! Maybe I can omit it, I try now see what's happening!
                            Knowing you will do that is kind of funny. Remember you were removing transistors from the circuit without understanding what is going on?
                            Last edited by budm; 03-07-2017, 10:38 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

                            • capwizard
                              Badcaps Legend
                              • Jun 2016
                              • 1991
                              • USA

                              #15
                              Re: HY9 is a Zener for ? voltage

                              gabiz_ro..................... .........." Then I use 15V zener diode to protect IC"

                              HY9 it is A 15v Zener diode. Not 9v

                              I omit it , the power supply works................yes .............
                              Last edited by capwizard; 03-07-2017, 10:39 AM.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: HY9 is a Zener for ? voltage

                                Once the VCC reaches the 16V startup Voltage, then it can drop down to be any where as long as above 10V, you should look at the VCC pin when first power is apply to see what the VCC using peak hold.
                                OVP for 'A' 21V
                                UVP = 10V
                                Recommended running V is 18V (A).
                                Last edited by budm; 03-07-2017, 10:47 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

                                • capwizard
                                  Badcaps Legend
                                  • Jun 2016
                                  • 1991
                                  • USA

                                  #17
                                  Re: HY9 is a Zener for ? voltage

                                  "Once the VCC reaches the 16V startup Voltage"

                                  I will put A 15 Zener diode, Thank you, budm.

                                  Comment

                                  • gabiz_ro
                                    Senior Member
                                    • Mar 2011
                                    • 167
                                    • Romania

                                    #18
                                    Re: HY9 is a Zener for ? voltage

                                    Using a lower voltage zenner can overburden RB110 or RB114-RB115 or even damage new zenner.
                                    Best way is to use one few volts lower than absolute maximum voltage

                                    15V is not enough,few exception,maybe depending on IC or zenner diode.(in real diode is 15.6V and IC could start at 15.5 but that is like lottery,zenner may have 14.9 and IC start at 16.3V so no way to start)

                                    Few HY zenner diodes found was 18V
                                    Last edited by gabiz_ro; 03-07-2017, 10:56 AM.

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: HY9 is a Zener for ? voltage

                                      Originally posted by capwizard
                                      "Once the VCC reaches the 16V startup Voltage"

                                      I will put A 15 Zener diode, Thank you, budm.
                                      After all the explanations, I gave up.
                                      Last edited by budm; 03-07-2017, 10:56 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

                                      • capwizard
                                        Badcaps Legend
                                        • Jun 2016
                                        • 1991
                                        • USA

                                        #20
                                        Re: HY9 is a Zener for ? voltage

                                        Thank you, gabiz ro ,This kind of power supply on a lots of Chinese small size, one board TV. Actually is not worth you time to repair if you can get a PCB for $20, but the knowledge is priceless.

                                        PS: I spend 2 days to fix it. It's not worth my time but I am extremely happy. 3 parts changed to fix this PCB. ( It covers a lot of brand name TVs EX: SEIKI SE39HE02 MAIN BOARD N14070237 TP.MS3393.PB713 at pic3.)

                                        PS: look at pic2 right side PCB EEprom is gone because I try to dump it.............
                                        Attached Files
                                        Last edited by capwizard; 03-07-2017, 11:19 AM.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • rddube
                                          Lenovo L490 Ram voltage circuit malfunction
                                          by rddube
                                          Hello friends,

                                          Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.

                                          I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I...
                                          07-15-2025, 04:41 PM
                                        • Fernon@Repair
                                          Gigabyte Z490 Gaming X Motherboard No VCORE Voltage
                                          by Fernon@Repair
                                          i have Gigabyte Z490 Gaming X Motherboard .it has a power on no display fault .. no vcore voltage and debug led stuck CPU LED .

                                          VCCIO voltage ok
                                          VCCSA Voltage OK
                                          VCCPLL Voltage OK
                                          Ram Voltage ok
                                          RamVTT OK
                                          VPP 2.5 OK

                                          But No Core Voltage

                                          and i want to this vrm ic datasheet or pinout (ISL69269)
                                          anyone have this ic pinout voltages?...
                                          06-25-2025, 07:19 AM
                                        • electron_jj
                                          Panasonic TH-L42D25A checking the PSU output voltage
                                          by electron_jj
                                          Hi Everyone, I am new to this forum. I have a Panasonic LED TV which doesnt turn on and is blinking 4 times repeatedly when I turn on the switch. The TV does not respond to the remote control so I had to turn on using the physical switch on the side of the TV. When I turn on the switch the 4 x blinking starts and repeat itself until I turn off the TV. There is a black screen. I turned off the light in the room to check the panel and I think there is no backlight as far as I can tell.

                                          I have been inspecting and testing the capacitors and diodes in the power supply board to try to...
                                          08-29-2021, 08:13 AM
                                        • sam_sam_sam
                                          Trip light 2400 watt line conditioner bought used issue with low voltage oscillation going on between relays
                                          by sam_sam_sam
                                          I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them

                                          The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly

                                          Now...
                                          06-09-2024, 10:57 AM
                                        • Document Archive
                                          ISL95831HRTZ ISL95831HRTZ-T ISL95831IRTZ ISL95831IRTZ-T Voltage Regulator Datasheet
                                          by Document Archive
                                          3+1 Voltage Regulator for IMVP-7/VR12 CPUs

                                          Compliant with IMVP-7/VR12, the ISL95831 provides a complete solution for microprocessor and graphic processor
                                          core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be
                                          configured as 3-, 2- or 1-phase VR while the second output is 1- phase VR, providing maximum flexibility. The two VRs share the
                                          serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two chip approach.
                                          Based on Intersil's Robust Ripple Regulator...
                                          11-05-2024, 03:24 PM
                                        • Loading...
                                        • No more items.
                                        Working...