Element ELCHW321 Catastrophic Failure

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • newtothis
    Badcaps Legend
    • Mar 2013
    • 1556
    • england

    #21
    Re: Element ELCHW321 Catastrophic Failure

    If so here is a schematic
    Attached Files

    Comment

    • Tvbob
      tvbob
      • Dec 2009
      • 204

      #22
      Re: Element ELCHW321 Catastrophic Failure

      The TV's household's AC supply was struck by lightning,Save yourself time and money buy a board... you may need a tuner (main) board as well. good luck

      Comment

      • mmartell
        Badcaps Legend
        • Oct 2013
        • 3189
        • Canada

        #23
        Re: Element ELCHW321 Catastrophic Failure

        Originally posted by newtothis
        If so here is a schematic
        Hey, thanks for that.

        Originally posted by Tvbob
        The TV's household's AC supply was struck by lightning,Save yourself time and money buy a board... you may need a tuner (main) board as well. good luck
        Well the tv is more of a learning project but def thanks for the heads up.

        Comment

        • mmartell
          Badcaps Legend
          • Oct 2013
          • 3189
          • Canada

          #24
          Re: Element ELCHW321 Catastrophic Failure

          I have identified some faulty components so far and removed them.

          two resistors - open
          two mosfets - shorted
          blown capacitor - missing lol
          fan7930 - paritally melted/broken
          4A fuse

          One of the resistors is the white square type (cement?) It is marked "3W 0R15K" which confuses me because without the "K" that would be 0.15ohms but is it really 15k ohms ? According to the schematic in post#21 this is a "0.22 2W" resistor so I'm at a loss.

          I'm trying to put together a part order so I can move forward. Any help is appreciated!

          Comment

          • PL519
            Tube lover
            • Jul 2013
            • 26
            • Germany

            #25
            Re: Element ELCHW321 Catastrophic Failure

            this is definitely 0.15 ohms / 3 watt and should be replaced by a resistor of the same type. It measures the source current of the mosfet to give a feedback to the pfc controller ic. Don´t forget the bridge rectifier as i mentioned before, replace it even if it measures o.k.

            Comment

            • mmartell
              Badcaps Legend
              • Oct 2013
              • 3189
              • Canada

              #26
              Re: Element ELCHW321 Catastrophic Failure

              I'm looking for a replacement for the FAN7530.

              Does anyone know if the FAN7930 is a drop-in replacement ? There are four flavours - the CMX, the BMX, the M and the MX.

              Any help is appreciated.

              Comment

              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #27
                Re: Element ELCHW321 Catastrophic Failure

                Instead of searching for many replacement parts in the hopes of repairing the board only to find the panel or main defective I've purchased another power supply for a few dollars which is also defective.

                However I do get the standby supply and when I heated the board the set came on and functioned normally.

                I can no longer force it on with heat so I can't pinpoint the faulty component this way.

                I've pulled the PSON pin and measure 5.3v. When connected it is 2v. I believe this line to be active high so I think the main is trying to turn on the PS.

                Would really love to learn at the schematic level how to troubleshoot this (schematic in post#21).

                PSON (pin12 labelled as "STB") splits off, one to one of the optocouplers and the other not sure where. I *think* the signal turns on both the 5v and 12v lines separately ???

                Tell me where to put my probes and what to look for but if you're feeling generous please tell me WHY so I can begin to understand HOW some of these circuits actually work.

                Comment

                • Alastair E
                  Chief Womble
                  • Mar 2013
                  • 1963
                  • U.K.

                  #28
                  Re: Element ELCHW321 Catastrophic Failure

                  Not that I know--That exact PSU.....

                  LCD PSU's generally have three main sections, The PFC, the STBY-5V and the Main Supplies section.

                  The PS-on generally activates the Main, and derives the 12 and 24V rails, and any additional 5 or 6V rails depending on the supply. In the case of yours with the BL as part of the PSU, that would be activated too

                  Often these 'Main' rails are all developed by the same Main section, with its own transformer itself driven by its own MOSFET (S) and control chip....
                  TELEFIX

                  How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                  http://www.irf.com/technical-info/appnotes/an-1088.pdf
                  PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                  Comment

                  • mmartell
                    Badcaps Legend
                    • Oct 2013
                    • 3189
                    • Canada

                    #29
                    Re: Element ELCHW321 Catastrophic Failure

                    Right I have Standby and power-on signal so what is preventing the supply from coming up ? How to troubleshoot ?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Element ELCHW321 Catastrophic Failure

                      Check the DC voltage on the main filter cap C810 legs when TV is in standby and when it is turn on. We need to find out if the PFC circuit is working or not.
                      Check or replace C822, C828, and C830, C809 (for VCC for the PFC IC).
                      Last edited by budm; 05-07-2014, 12:05 PM.
                      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

                      • stj
                        Great Sage 齊天大聖
                        • Dec 2009
                        • 30917
                        • Albion

                        #31
                        Re: Element ELCHW321 Catastrophic Failure

                        any switching psu that runs when warm, but cant start from cold is almost always a small startup cap.
                        usually 4.7-47uf in value.

                        c809 or 822 or 860 maybe
                        Last edited by stj; 05-07-2014, 11:39 AM.

                        Comment

                        • mmartell
                          Badcaps Legend
                          • Oct 2013
                          • 3189
                          • Canada

                          #32
                          Re: Element ELCHW321 Catastrophic Failure

                          Originally posted by budm
                          Check the DC voltage on the main filter cap C810 legs when TV is in standby and when it is turn on. We need to find out if the PFC circuit is working or not.
                          Check or replace C822, C828, and C830, C809 (for VCC for the PFC IC).
                          budm voltage at main filter cap is 387v. I have checked those capacitors and they look good with my esr meter. Is there a way to look deeper before just replacing caps ?

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Element ELCHW321 Catastrophic Failure

                            That is fine, the PFC is working so that means the standby power supply is working right now? I thought you have to heat up the board to get the standby power supply section to come on.
                            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

                            • mmartell
                              Badcaps Legend
                              • Oct 2013
                              • 3189
                              • Canada

                              #34
                              Re: Element ELCHW321 Catastrophic Failure

                              No, standby works fine. When I heated the board the secondary voltages came on and the tv worked as normal. That doesn't seem to work anymore and the caps you suggested check out fine on my meter. What next ?

                              I did check the voltages across the caps C822, 828 and 830. C828 and C830 had 16-17v on them. C822 had under a volt so the FAN7620 is not receiving vcc ?

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #35
                                Re: Element ELCHW321 Catastrophic Failure

                                "C822 had under a volt so the FAN7620 is not receiving vcc" That cannot be since that is the VCC for running the IC N801 (FAN7602B) for the standby 5V and the switched 5V and the switched 12V, otherwise you will not have standby voltage right now and you will not be getting the voltages at C822, 828 and 830.
                                "When I heated the board the secondary voltages came on and the tv worked as normal" Which voltages are those? the switched 5V and the switched 12V?
                                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

                                • mmartell
                                  Badcaps Legend
                                  • Oct 2013
                                  • 3189
                                  • Canada

                                  #36
                                  Re: Element ELCHW321 Catastrophic Failure

                                  Yes the switched 5v and 12v came up after heating the board. I cannot repeat it by heating anymore.

                                  Then disregard my voltage readings lol maybe I didn't make contact this was on the top side of the board.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #37
                                    Re: Element ELCHW321 Catastrophic Failure

                                    So right now the condition is, you do have PFC voltage (387VDC as reported) but no switched 5V or switched 12V. The switched 5V is controlled by the switched 12V, if 12V does not turn on then there will be no bias to turn on MOSFET V813 for the switched 5V. Check C841.
                                    Last edited by budm; 05-07-2014, 04:43 PM.
                                    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

                                    • stj
                                      Great Sage 齊天大聖
                                      • Dec 2009
                                      • 30917
                                      • Albion

                                      #38
                                      Re: Element ELCHW321 Catastrophic Failure

                                      did you resolder the transformers yet?

                                      Comment

                                      • mmartell
                                        Badcaps Legend
                                        • Oct 2013
                                        • 3189
                                        • Canada

                                        #39
                                        Re: Element ELCHW321 Catastrophic Failure

                                        budm, will check it.

                                        stj, no I did not.

                                        Comment

                                        • mmartell
                                          Badcaps Legend
                                          • Oct 2013
                                          • 3189
                                          • Canada

                                          #40
                                          Re: Element ELCHW321 Catastrophic Failure

                                          C841 checks out good.

                                          Comment

                                          Related Topics

                                          Collapse

                                          • flysky
                                            Gigabyte H610M S2H V2 help to identify the element.
                                            by flysky
                                            There is a motherboard Gigabyte H610M S2H V2 (DDR5), I can't find boardview
                                            Help to identify the element, marking on the element - C31PH. It stands next to the USB 3.0 and it looks like it is ESD Protect chip. We need a datasheet to this element. Maybe someone has already identified such an element. Help please.​






                                            ...
                                            01-23-2025, 07:21 PM
                                          • EasyGoing1
                                            The best way to drive a heating element?
                                            by EasyGoing1
                                            I've got this circuit that I've been playing with on a breadboard. I'm not happy with it mainly because the MOSFET gets too hot and generally controlling the temp of the heating element with the Arduino has proven to be a little more cumbersome than I would like.

                                            What I would like to know, is what is the best way to set up a circuit like this? The heating element is just a PCB and its going to be mounted under a 3D-printed enclosure that a lizard will use to warm his belly.

                                            This is the general setup that I have now.



                                            This is what the...
                                            01-25-2023, 11:29 AM
                                          • sam_sam_sam
                                            Heater element wire type instead of a fuse when troubleshooting a short circuit DIY
                                            by sam_sam_sam
                                            I was Ollie today which is a close out / surplus outlet store I do not go in there to often because you find things that you should not be tempted by but that is a another story

                                            I saw a small space heater that used a wire type of heater element which I been looking for a while but not really hard mind you but when I saw this I grabbed it I going to go back tomorrow and buy the last one that is like the one I bought today because I need the heater element and the ceramic insulators and more of heat element wire because this one has two different wattage settings one 1300 watts ( tap...
                                            12-16-2023, 08:39 PM
                                          • Document Archive
                                            Surface Mount Fuses Fundamentals Datasheet
                                            by Document Archive
                                            TE Circuit Protection offers the widest selection of surface-mount fuses available for addressing a broad range of overcurrent protection applications. Helping to prevent costly damage and promote a safe environment for electronic and electrical equipment, our single-use chip fuses provide performance stability to support applications with current ratings from .5A up to 20A.

                                            TE Circuit Protection also offers the telecom FT600 fuse for telecommunications applications. This telecom fuse helps comply with North American overcurrent protection requirements, including Telcordia, GR-1089,...
                                            10-07-2024, 06:07 AM
                                          • Sus256
                                            HISENSE 65E7KQ PRO - no boot
                                            by Sus256
                                            Hi all!

                                            HISENSE 65E7KQ PRO
                                            RSAG7.820.13512 - chassis
                                            MT9618BAATAB - cpu
                                            RSAG7.820.12059 - power
                                            HD650Y3U77 - panel
                                            KLM8G1GETF - emmc

                                            The TV does not turn on, the standby indicator is on. All voltages are present.
                                            Emms is dead. Not readable, not detected.
                                            Replaced emmc.
                                            But with another dump there is no launch

                                            Terminal log

                                            UART
                                            <
                                            AC_ON
                                            RPMB key is not yet programmed

                                            HASH1_VERSION=0x00000000 64bit
                                            E-B
                                            FDE enabled
                                            layout pattern onebin by SAR7,0...
                                            06-01-2025, 02:11 AM
                                          • Loading...
                                          • No more items.
                                          Working...