Re: BN44-00424A Continuous Restart
Hello,
Sorry to post onto your thread but due to the new user rules I cannot open an new thread I am looking for the schematic drawing to BN44-00424A I cannot seem to find in anywhere if someone could attach it that would be great.
Thank you
-
Re: BN44-00424A Continuous Restart
From the way that Zener is hooked up, it looks like one of those XX431 Vref DIODE:
http://www.mouser.com/ProductDetail/...4AAymvcTt%2fGG
https://cdn.badcaps-static.com/pdfs/...f3f88c819d.pdf
see fig 8Leave a comment:
-
Re: BN44-00424A Continuous Restart
Next time ,When you have the power supply removed look on the back foil side at ZD585 to connector that goes to the main board there is a code on the three legged SMD. I cant read mine. What is the code? I have a service manual but no shematic or parts list for parts on the board were provided.
Thanks
LtankLeave a comment:
-
-
Re: BN44-00424A Continuous Restart
The LED drivers have detection circuit to detect shorts or open LEDs circuit. Glad you finally found the real cause of the problem.Leave a comment:
-
Re: BN44-00424A Continuous Restart
lol. this proof sam's page at repairfaq site, don't always think your problem is complicated.Leave a comment:
-
Re: BN44-00424A Continuous Restart
I tore apart the panel after reading some other threads and found one of the led backlight strips had many dead led's, two of which failed open.
I put a jumper across both and reinstalled the strip and the power supply. It fired right up and never shut off. Turns out the PS is intolerant of no load condition on the led driver circuit.
Thanks for everyones input but power supply malfunction in this case turned out to be a red herring as the malfunction was "expected behaviour".
THREAD CLOSEDLeave a comment:
-
-
Re: BN44-00424A Continuous Restart
I am still prefer test diode, transistor, or this optocoupler with analog vom. it easier when test the emitter collector legs with analog one. but the others used to using digital meter and would help you. btw you have 3 optocoupler is I don't look wrong way.Last edited by senz_90; 01-31-2014, 08:37 AM.Leave a comment:
-
Re: BN44-00424A Continuous Restart
So I have three octocouplers on this board. The first two test like diodes with a forward voltage drop just over a volt and no voltage in the opposite direction.
The third has a forward voltage drop of .74v in one direction and .85v in the other. Thoughts ?Leave a comment:
-
Re: BN44-00424A Continuous Restart
You can test one side easy as its just a diode - other side is more difficult
http://www.antimath.info/electro/how...n-optocoupler/Leave a comment:
-
Re: BN44-00424A Continuous Restart
Cannot find a service manual or a schematic for the ps.
Speaking of octocouplers I have a pair of them on this board. How do you test them and if they fail to provide feedback won't that shut down the ps ?Leave a comment:
-
Re: BN44-00424A Continuous Restart
did you have the service manual or psu schematic? from i know feedback lines usually connected to optocoupler or some ic that has this pins for feedback. smps is mysterious and various, when you learn much you will know that is not enough but you've got fun!! and this is the reasons to makes me learn it deeper.Last edited by senz_90; 01-31-2014, 06:14 AM.Leave a comment:
-
Re: BN44-00424A Continuous Restart
Problem is I can't tell a secondary output diode from a feedback diode so if somebody wants to point them out I will gladly try that.Leave a comment:
-
Re: BN44-00424A Continuous Restart
i dont know if this help. but try to remove the transformer of smps and see that is still restarting or remove secondary diode one by one except the feedback ones after attach again this transformer to circuit to determine where section is failed. but try to hear others advice because i just know how to troubleshoot a smps at beginner level.Last edited by senz_90; 01-31-2014, 05:15 AM.Leave a comment:
-
Re: BN44-00424A Continuous Restart
I need an SMPS for Dummies primer to do any effective troubleshooting. Too many large gaps in my knowledge.Leave a comment:
-
Re: BN44-00424A Continuous Restart
good luck. i hope if i could help you.Leave a comment:
-
Re: BN44-00424A Continuous Restart
Looks like both. Trying to figure out now why the PS won't ramp up the secondary voltages without restarting.Leave a comment:
-
-
The motherboard initially receives voltage for VGH, but it constantly reboots. When I remove the flex cable at the bottom, I hear normal sound, but there is no image on the screen and it is black on both sides. This time there is no voltage on VGH.
... -
Hi mates, did'nt find any better topic. Here is an LG55EC930V with faulty mainboard. The MOBO rev number is EAX65612206(1.1). There is two type on ali, 65612206(1.1) and 65612205(1.0) both for the same TV model, but the last one is 50% cheaper.
What is the difference on this two mainboard? Clould be only region or must be order the exactly same 1.1 version?
2206(1.1)
2205(1.0) -
Hi guys, can someone help me?
I have an issue with laptop dell latitude e5490 that auto restart when arrive at certain point in loading windows.
Board model is dm70 la-f401p rev:1.0 2017-09-20.
At first, the issue is sometime ssd sata 2.5 not detected. i already try another cable, at certain point, it ok using old cable (i mean sata cable here).
After a few days test, is seems ok.
Days later, another issue come, that is auto restart when certain point in loading windows. i already test another ssd, another ram, another sata ribbon, still same.... -
Hello,
I have an old MASTER TL-240 LED TV. Since it stopped working and it had a DVB-T receiver that is being dismissed in Italy, I've decided to replace the mainboard with a DVB-T2 one.
The original problem was that when switching on the TV, the power LED was transitioning from red to steady blue, without showing video or audio.
After checking some voltages on the power supply board (HKL-240101-B Rev. 1.4, HKL from now on) someone suggested me to replace the mainboard.
Now I have some doubts about how to connect the new mainboard to the old power supply.
First of... -
I have a Vizio M43-C1 stuck in a reboot loop with no backlight.
I've tested all the voltage rails coming out of the power supply and they are "normal" for this model (PS_ON & DIM go high when turned on, BL_ON & 3D_ON are close to zero due to backlight power flowing through the mainboard, 5VSB is 5V, and 12V is 19V, which is apparently normal for this board).
Basically, I get similar results to Garry in this post: https://www.badcaps.net/forum/showthread.php?t=80346
So, I've ruled out the PSU for now.
The reboot loop...
Leave a comment: