Announcement

Collapse

Forum Rules *ALL NEW MEMBERS, PLEASE READ!! UPDATED!!*

First and foremost, Welcome to the Badcaps Capacitor Search Engine & Forums!

New members that have activated their accounts have limited access to certain features of the site until established. Members with zero posts have no access to the private messaging system. Also, members with zero posts may not edit certain profile attributes, such as signatures. New members also may not create new threads. However, new members with zero posts have full access to all technical information contained on this forum, and that also includes attachments (images and files that other members have uploaded), and new members that have activated their accounts are free to post replies to existing threads. If you wish to create a new thread, the fix is simple! All you need is ONE post to be able to have full unrestricted access, and that can be simply posting an introduction of yourself or say hello in THIS THREAD. This may seem a little strange, but it helps keep spam and abuse curved. Please note, that it may take up to one hour from your first post for the limits to be removed. If you make a post and don't immediately see the restrictions gone, be patient. The promotion system updates every hour.

Please complete your profile after making your first post, with your name, locale, and other info. It's nice to know members on a first name basis, and know where they're from. Makes for a much friendlier environment!

Posting rules for this forum will be STRICTLY enforced by myself as the owner/administrator, and my moderator crew.

Badcaps.net IS A BUSINESS!!! If you are a servicer, service center, or vendor of any kind in the computer/capacitor industry, you are NOT permitted to advertise, link, promote, or plug your business on this forum in ANY way! NO EXCEPTIONS!! This includes asking for "donations" in exchange for BIOS passwords or tech advice for anything! If I see you doing that, your post will be edited or deleted, and you warned. If it happens again, you will be banned. The only exceptions are the references to the companies quoted in the FAQ which the administration have added for the convenience of those around the world who have difficulty to source caps for their repair.

This also includes using this forum's private message system to solicit business. Members, if you receive a PM from anyone offering repair services or components, please alert me immediately! Myself or any of my moderators, will never private message a user soliciting business, for Badcaps.net, or any other servicer/vendor. If you PM me about repairing your device, I will reply and take care of you, however, I will not message you first.

------------------------------------

Posting rules:

This forum was created to be a technical support forum primarily for the do-it-yourselfers who choose to repair their own boards. Any and all technical questions are welcome!

1) Please use the SEARCH feature!! Your question may have been answered in another thread! Please search first and see if it has!

2) When posting a technical question, be as detailed as possible in your thread. The more information we have about your specific problem, the better we can answer your question.

3) Please use COMPLETE sentences, punctuation, and grammar! Nobody is perfect, hence, a spelling error on occasion is no biggie. However, posts/threads that are unreadable will be deleted. This includes any and all forms of 'ebonics', leet, chatroom jargon, and 'text message' shorthand and slang. This forum is not a chatroom/text message, please use full words and complete sentences.

4) Keep discussion on topic!! DO NOT HIJACK THREADS! It's easy to do (I've done it myself a few times...) Lets try to keep it down to a minimal!! If you have something really off topic, that's what the lounge is for!

5) Keep things civil! There will be no tolerance for flaming, bashing, hateful remarks, racial remarks, adult material of ANY kind, and so on.

6) THE LOUNGE RULES! The lounge is a place for off topic chit-chat! If you post something that might be considered questionable or something you don't want kids to see, or something you can't view at work/school, etc, please label that thread *NWS* or NOT WORK SAFE in the thread title as a warning. The Lounge is NOT moderated, anything is welcome... Feel free to post rants, jokes, cars, hot women (remember the NWS warning in the title), or just about anything within reason. It's an open forum! Please refrain from participating in political topics if you have thin skin, they can get heated sometimes!! Remember that we have members here from all over the world, with many different views and cultures. Political debates can turn really ugly, and really fast, and if they degrade to personal attacks and useless banter/bashing, moderator action will ensue. I want this forum to be a safe haven for technical discussions from all walks of life, so lets keep off topic discussions civil and friendly.

7) Spamming and spammers will NOT be tolerated or accepted in any way, shape, or form! Spam bots are instantly and permanently banned, and their threads deleted! The mod crew is really quick to zap spammers, we typically pop them before they even get to post. This also includes regular members as well. be courteous and not post spam. This includes links to off-site information that's not relevant to the thread at hand. Do not plug other websites, forums, or businesses in your signatures. You may do so in a thread if the off-site link you're posting is relevant to the topic, but otherwise, don't do it. If you see a thread which clearly a spam bot posting that we have not removed yet, DO NOT click any links in it!! Simply click the 'report bad post' button, and it'll be taken care of, usually within minutes.

8) Account removals & closures: Since no personal information is given in the creation of your Badcaps.net Forum account, requests to remove and/or delete accounts will be declined. Any requests for removal of threads & posts you created will also be declined. The reason is the missing posts can/will leave threads incomplete and fragmented. For the threads to be of help to others later on, information can't and won't be missing. However, if you inadvertently posted personal identifiable information in a post (such as an email address, real name, or phone number), please contact a staff member. In those cases, the post may be edited or removed, at the staff members discretion.

That's about it for the rules, the setup here is pretty loose. However, if you're caught violating any of the rules above, here's what will happen:

First offense: Warning by me or a moderator
Second offense: Banning for 1 day
Third offense: Banning for 3 days
Fourth offense: Banned permanently.

If you do something really dumb, or are just a troll, I will skip the warning and the temporary banning, and ban you permanently!

The rules are pretty cut and dry... However, if you have any questions about this policy, feel free to contact me.
See more
See less

Bakon 950D "Extra Crispy" mod (19->24 Volt)

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #31
    Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

    Originally posted by dssence View Post
    Hi it's 220volts here. but still I got this issue, about not turning on. Having to discharge primary electrolyitc 100uf x 400volts to restart.
    Hopefully Th3_uN1Qu3 will see this thread and may have some advice on what to change/resistor value etc.

    Comment


      #32
      Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

      Originally posted by vinceroger69 View Post
      Hopefully Th3_uN1Qu3 will see this thread and may have some advice on what to change/resistor value etc.
      Yeah , still waiting for him to reply. thanks anyways for the help

      Comment


        #33
        Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

        looking at my notes from russia, i suspect it's R1 or R14 needs to be messed with.

        i have this line "parallel to the current resistor in the primary we add a resistor to 2.7 ohms"
        nice & vague, looking at the psu schem i can only imagine they are talking about R1(0.27ohms) which is a shunt for the main switching fet.
        by putting 2.7ohms in parallel you reduce the volt-drop the chip will sense.

        Comment


          #34
          Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

          It should work without messing with the current shunt, mine does no problem. Try 20k for R11. 27k (original) paralelled with 91k gives 20.822k, so 22k is a bit high and could very well be your issue.

          As for tip temperature lower than expected, make sure the tip is clean then pick up some solder with it, before placing it onto the thermocouple. Any oxidation acts like a thermal barrier. When you are sure the temperature reading of your thermocouple is correct, use the built-in calibration function (described in the manual). It works very well.
          Last edited by Th3_uN1Qu3; 09-24-2018, 07:02 AM.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

          Comment


            #35
            Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

            Originally posted by Th3_uN1Qu3 View Post
            Try 20k for R11. 27k (original) paralelled with 91k gives 20.822k, so 22k is a bit high and could very well be your issue..
            your as bad as the russians!
            can you translate that into english?

            what to put in place of R11??
            you previously said put 15k in parallel with the 27k factory part.

            Comment


              #36
              Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

              Originally posted by Th3_uN1Qu3 View Post
              It should work without messing with the current shunt, mine does no problem. Try 20k for R11. 27k (original) paralelled with 91k gives 20.822k, so 22k is a bit high and could very well be your issue.

              As for tip temperature lower than expected, make sure the tip is clean then pick up some solder with it, before placing it onto the thermocouple. Any oxidation acts like a thermal barrier. When you are sure the temperature reading of your thermocouple is correct, use the built-in calibration function (described in the manual). It works very well.
              So many thanks for helping. I'm going to try instead of 22k , 20k for R11. I remove R11 and replace it by 20K resistor. Have you seen this schematic I found in the russian forum, I was reading about the work of TL431, to see how it adjusts the voltage. But let me know what do you think about this russian schematic, will try with 20K . The weird issue is correct me if I'm wrong, Pin 7 is DEM and sets the trigger for the OVP protection, if it exceeds 3.75 OVP triggers and shuts down but I calculated with 27K and 130K voltage divider and it's within margin. If we take 24 volts and 27k and 130k it gives 3.474 which is fine, if we take 24 volts and 20k and 130k it gives 3.2 which is aso fine. So i'm interested in understanding why I got to manually discharge the primary electrolytic to make it work again. but anyways I'm going to check replacing a 20k on r11.

              Comment


                #37
                Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                Originally posted by stj View Post
                your as bad as the russians!
                can you translate that into english?

                what to put in place of R11??
                you previously said put 15k in parallel with the 27k factory part.
                If I'm not mistaken and missunderstand he said to replace r11 by 20k resistor.

                Comment


                  #38
                  Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                  Originally posted by dssence View Post
                  If I'm not mistaken and missunderstand he said to replace r11 by 20k resistor.
                  Yes exactly. R24 (bottom feedback resistor for TL431) is the one that needs to have 15k in parallel added, take another good look at the pictures, stj.

                  I did not check the Russian schematic. I did the homework on my own in the first place.

                  The label on the transformer showing the turns ratio helped greatly. Since the OVP is on the primary side, sensing the aux winding, and both circuits are simple resistive dividers, it follows that when adjusting the bottom feedback resistor of the TL431 to bring the voltage up, the OVP level has to be scaled up by the same ratio by lowering the bottom resistor of the OVP divider. It was all grade school math there.

                  I did not need to go thru extra iterations once I discovered where the OVP circuit is, it worked first go for me with the values that I have posted. Still works great, and no I haven't even bothered to replace the output capacitors yet.
                  Last edited by Th3_uN1Qu3; 09-24-2018, 11:53 AM.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                  Comment


                    #39
                    Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                    Originally posted by Th3_uN1Qu3 View Post
                    Yes exactly. R24 (bottom feedback resistor for TL431) is the one that needs to have 15k in parallel added, take another good look at the pictures, stj.

                    I did not check the Russian schematic. I did the homework on my own in the first place.

                    The label on the transformer showing the turns ratio helped greatly. Since the OVP is on the primary side, sensing the aux winding, and both circuits are simple resistive dividers, it follows that when adjusting the bottom feedback resistor of the TL431 to bring the voltage up, the OVP level has to be scaled up by the same ratio by lowering the bottom resistor of the OVP divider. It was all grade school math there.

                    I did not need to go thru extra iterations once I discovered where the OVP circuit is, it worked first go for me with the values that I have posted. Still works great, and no I haven't even bothered to replace the output capacitors yet.
                    Sounds great you didn't bother changing the output caps. Anyways to see I did understand correctly I should have to replace R11 with 20k and R24 I removed it and replaced by a 3.3k . Correct me if I'm wrong. If changing those value I still go through the issue it doesn't turn on once more. What else would I got missing, could it be a different board revision. or what the heck is wrong?

                    Comment


                      #40
                      Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                      did you cut the trace when you fitted the zenner diode? you probably have but worth confirming.

                      Comment


                        #41
                        Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                        R24,
                        russians replaced it with 3k6 for 23v
                        un1qu3 bridged the original 4.42k with 91k

                        3k3 is going to give well over 24v

                        Comment


                          #42
                          Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                          91K goes in parallel with R11 (OVP) not R24 (feedback). 15K is in parallel with R24 (originally 4.42k) which gives 3.414kOhms as a final value for R24.

                          But yes, I agree, 3k3 is too low. 3k3 for R24 would give an output of 24.94V. Precision is needed here. That is why I decided to add a resistor in parallel, because I did not have the required calculated value.
                          Originally posted by PeteS in CA
                          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                          A working TV? How boring!

                          Comment


                            #43
                            Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                            Originally posted by Th3_uN1Qu3 View Post
                            91K goes in parallel with R11 (OVP) not R24 (feedback). 15K is in parallel with R24 (originally 4.42k) which gives 3.414kOhms as a final value for R24.

                            But yes, I agree, 3k3 is too low. 3k3 for R24 would give an output of 24.94V. Precision is needed here. That is why I decided to add a resistor in parallel, because I did not have the required calculated value.
                            Thanks for all the help. I finally managed to solve the issue when it didn't turn on. Now it turns on and off without having to discharge the primary electroyltic.
                            I did by replacing r11 by two resistors of 10k in series giving around 19.8k ohms.
                            Now here goes the problem, the unit sometimes starts to heat the tips and sometimes doesn't. I can hear PWM triggers sometimes and sometimes it get stuck. Any ideas about this? . I can't understand why something so simple get so complicated for me. Many people did the mod without any issues. I added the zener to the gate on the other board cutting the gate trace fine. Replaced the caps 100uf x 35 and the resistors. Can't happen to understand what could be going on. Waiting for your help.
                            I thought it could well be the trimmer on the other board, so I played around , but still no noticeable changes.

                            Comment


                              #44
                              Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                              did you mean 1000uf 35v? you put 100uf

                              Comment


                                #45
                                Re: Bakon 950D "Extra Crispy" mod (19->24 Volt)

                                Originally posted by vinceroger69 View Post
                                did you mean 1000uf 35v? you put 100uf
                                Yes sorry 1000uf was just a typo. yes I replaced by 1000uf x 35. I think I'm going to revert all the mod and see if this still happens.

                                Comment

                                Working...
                                X