This is exactly what I was looking for but for a different type of tv. This troubleshooting without any other boards made my diagnostic easy, and adaptable to my own needs. Thank you:)
Thank you too! And...this may sound strange..but...I have a request for you and hopefully everyone else who finds this video helpful: today we've had our first massive Google review negative campaign, having recorded 7 or 8 false reviews by an upset customer who was silly enough to leave them all in one day and immediately after the conflict. Their original review and our response to it are also there, preceding the flow of fake reviews. My simple request is to drop in a good word for Coppell TV Repair LLC on Google reviews if our videos or we have helped you in any way. Thanks for everyone who could help!
hi Coppelle must say you explain very well that even a person like me who have minimal knowledge can follow and understand. i opened up my tv. i found that the vs and va voltage was present but still no picture. i also noticed that the vs voltage was 279 instead of 206 and i found that i couldnt adjust it...what can i check next to fix the problem?
For every problem there is a level of complexity beyond which it makes more sense to involve professional or just abandon project rather than hitting your head in the wall. While I can't say with 100% certainty this is the case here I happen to believe that you are better of with one of the above two options versus trying to get help online. It is fairly uncommon for Vs to be above designed value and there are number of reasons for that; I won't go in details because it is beyond the scope of what this RU-vid channel is created for and because it has proven in practice to be mostly a waste of our time - no offense meant in any way.
Great video thanks a lot! Can you give a tutorial about B44-00773c? I wasn't able to figure out what the normal range for "PWM_BLU" and "UD" are. Thanks!
Hey talkes to u on another video have u did any vid on a samsung samsung pn51e450a1f. Im trying figure how get mine power supply turn on but cant find video to. So i can test it i do no i have 5 volts on stand by ..and also the little black thing you test in the video belive there mosfits think spelled it wrong but on the board if i touch only the ends and not the middle i get a beep on volt metter goes 0000 but not sure if testing them right can they be bad like 5 test this way and still get 5 volt stand by hope u understand what im asking just dont want keep buying boards and see there no vids on my model of tv😭
I do not know if we have a video for the power board of pn51e450a1f, sorry. There are hundreds of different TV models out there and it would be unrealistic to expect anyone to have or even remember if they have something for every one of them. Natural course of action would be to check on a company's website or just on Google for who might have what one needs. I am also afraid I do not have the resources to offer remote troubleshooting in your situation. It will just require more than I am physically able - and honestly willing - to devote while still not guaranteeing any clear and positive outcome for either of the two involved parties. No offense meant in any way...this is just my reality. Nothing wrong with asking questions. I'd recommend trying badcaps.com - there are some great people out there and you can learn a lot just from reading past communications.
This is the power supply for the 2016 UN55KU7000FXZA, right? Is it dual voltage? I want to know before I buy a step down transformer and it turns out to be unnecessary. Thanks
Do you know if this BN44-00807A is compatible with BN44-00807E? my TV has the E model, no where to be found, is is flickering a lot , when I opened it, a couple caps look blown, I will get those replaced and see what happens, but I wanted to know if other boards are compatible since this E model doesn't seem to be available or out of stock
Just to update, I got it fixed replacing 3 Caps of 3.3uF on the upper right side corner, I don't remember the correct name but you could see how those were gone.
Bobby, the best PSB testing vid on RU-vid! My board shows Vs high as well and out of range for adjustment. Do you have any vids on testing the main board? My PSB tests good but seems not to be getting the signal to turn on. Thxs.
No vids on the main board, sorry...but you can search around for how to test the plasma logic board and sustain boards by disconnecting the plasma logic from the main and shorting a jumper there to generate auto raster..it's fairly common procedure for Samsung plasma TVs. Plus, if you have out-of-range Vs voltage I'd focus on that...the odds of having that problem AND something in small signal boards are fairly low.
Thanks so much for the response. Unfortunately, the logic board and main are one board on this model (PN60F5300AFXZA US01). I'm wondering if a high Vs comes down when the "load" of the display etc. is applied. I've only tested the power supply isolated, as you did in the vid.@@coppelltvrepair
Hi.I am Marcel, and i want to ask you a question.I have a Panasonic TX-P50X50E and on the main capacitor,i can measure only 324v Do you thinck i is enaught?Because the stand by voltage is driving by a FAN6755u,and do not want to start,so i do not have 5V stand by .Please help
I must admit we do not do many Panasonic power boards, so I can't say first hand experience if 324V is normal, but I'd rather assume it is not. It should go higher. It also has very little to do with the standby voltage other than the standby is usually required in order for the PFC to work in the first place - the PFC driver usually gets power from the same transformer that produces the standby. But that's just the driver, not the source for the pumped up mains voltage. Which means that if standby had fluctuations because of which it would not work fine then the PFC most likely would not have started to begin with.
Thanck you for responding.I am agree with you , but i would like you take a look to the schematic diagra first, because i thinck this board was designed by a different way, Please let me send you the diagram, which i downloaded from internet (with the board reference :darfon b159-201), and ,i didn.t refer to a fluctuating stby voltage.The FAN6755u have a HV pin,where the voltage is about 214v, and that voltage a re fluctuating.The octocupler, which is conected to FB pin of FAN6755, on the foto transistor side, measure a fluctuating voltage at about 2,6-3V.I don.t know what to do..Thanck you anyway,I know that you can not waste your time ,so ,i will try not to bouther yo too much.
I have a 619A that destroys the thermistor upon connecting to mains. (Bare board, nothing else connected). So something is shorting out and taking out the thermistor (and mains surge protector)...
There are, actually a number of them. PFC circuit power switching transistors are a common source of shortage, but proper fix is often more complex than just replacing them. Power switches for the transformers are also known to fail, usually due to corrosion of the solder joints of their legs as well. Now that I've given you a good direction based on first hand experience I too have a question for you: where do you think money come from so we can put something at the table in the evening - repairing boards or educating others on individual basis on Internet? No offense meant.
Very interesting educational video. You definitely explained a lot more technical details in this video than in the other one. I know you don't make any $ by making these videos and enlightening us, but the information you share is definitely very much appreciated. You are a very good mentor. I'm going to apply what I learned here in attempting to bench test my BN44-00515A board. One question I have is that you used a load resistor when you tested the BN44-00515A, but not when you tested this board. Is the load definitely required for the 515A, or is it ok and safe to power up the VA and VS without load on that model? If the load is required, then I'll most likely send it in to you for testing. Thanks again.
Hi. Very nice informative video. Are these power capacitors known to fail as they handle pretty high voltage of 400V. How much voltage are they rated for any idea?
No, the capacitors on this board are not known to fail a lot. This may change in future, but as of today I would not look at capacitors when considering problems on those boards.
Btw is it safe to take the power supply board out of a tv because i have a old tv laying around all i want is the power supply board sense the tv stopped working
Yes it is safe if it has been laying around for more than 2 hours. The worst that may happen is there may be a spark coming out if it if it gets touched in a certain way , but there's no risk to human handling it with hands other than possibly surprising them.
@@coppelltvrepair oh ok because there some parts i can use and desolder and it has been laying around sense Christmas and so i should still dis charge the compacitors?
On most Samsung plasma TV power boards you have 3.5V on pwr_on waiting for 0 to activate the first stage of the board (PFC, low voltages). And no, there's no 1k resistor needed for that.
@@14.1guy2 That is incorrect. Most power supply boards have built-in load providing minimal current allowing proper regulation of the board without external load. In other words the board is never without load. It is not working at designed / optimal current without external load, but the output voltage is holding with and without the sustain boards.
Hi I started checking this board by checking the fuse.( t12ah250v ) and it is blown. What would you recommend from here. The tv was turning off after about a minute. I did the reset by unplugging it for 30 seconds then holding the on button for 30 seconds. When i plugged it back in it was completely dead not even the red stand by light. Samsung PN64F5300
We repair those boards for money, so please don't expect us to teach you how to do it yourself - it would be in conflict with what feeds our children. With that in mind we recommend you replace the board, have it repaired or try repairing it yourself. Replacing the fuse alone is not going to help and using a repair kt from ebay may or may not help,.but is not enough to prevent another failure within the next year.
@@coppelltvrepair I would like you to repair the board if that is the problem. I wanted to know if you thought this was the problem with the tv or should I look further?
@@christopheraquina7744A blown fuse on a board is virtually certain indicator of a problem on the board. Coupled with teliable statistical failures on this board I'd say you are not likely to find problems elsewhere.
Make sure the problem is in the board and not out of it by testing it on a bench, then either buy a working board or send yours to repair to someone who knows how to troubleshoot it or start reading and watching on how to fix electronics. I think that pretty much sums it up if you want it working.
Thanks. You was completely right. I asked realy before wached this video,only coz it close to my issue. Then went trough all video more closer and found exactly what i need. Found all voltages and reason why it was missing. So power board is ok, and that let do next step and locate next fault. After connecting all together and turn on power both Vs and Va going down to 0, in about 20 sec. Found that if disconnect Y main( both connetion to power board and to X main) then Vs and Va remain in proper range. Then found if disconnect Y buffer ,then Y main can be connected and voltages remain in rainge. So faulty Y main or Y buffer. When checking diode in connection to transistor at Vs voltage contact on Y buffer, looks like diode showing voltage drops 0.200mv both ways. Soldered diode out and checked,found diode ok, but connection points still showing voltage drops even without diode.So far i am stuck.Diode soldered back in.What could cause voltage reduction till 0, but no short and tv not getting in loop
The exact sane way, Find any of the videos we have for BN44-00513A, BN44-00514A, BN44-00515A, BN44-0516A. Connectors may be at different locations and may be organized a little differently, but all will have the same STB and PS_ON and VS_ON pins that function the same way.
Follow the link in the description or just go to www.coppelltvrepair.com . The repair service listing has detailed explanation of how the process works.
Hello long distant friends, I'm Marcos from Brazil and I liked your video about Samsung repair. I would like yoou guys to help me with the diagram of a card board BN44-00703G from a UN48J5500 TV set. I´m spending a long time trying to find this service manual or the diagram schematic but until now I didn't successiful. Sorry to not speak your language and I hope someone here kindly help me to find the diagram. I didn't even start to fix my TV. Thanks Marcos
