So. One only little capacitor SMD shortcircuited was the whole problem? My mama!!! Spend lot of hours to find it. I hope it deserve the work. Congratulations. Thanks
Really good informative video's..I have the same board on a jvc led tv..but have no standby led..can you point me as to where the problem could be...thanks
Please, do you have the pinout for the connector to the power supply board? I cannot get any information on this. I would like to know which pins are ps_on, bl_on etc.
As to C525, I came today across notion, that this ceramic cap can be replaced by 47uF 100V electrolyte. You find space provided for it on the other side, marked C521. Both ceramics (similar third one, too) are reported as frequent to fail. Thanks for your lesson!
hi fella fantastic video m8, i fix tvs for a hobby love doing it, i've got a polaroid, p40led14, with no backlight i've tested the red wire 117 volts coming off it and stays there, but at this voltage does it like one of the leds has shorted, thanks for your time,
hello reecey, cheerrs for videos and all you do but have yet to find a fix for same model except all works great and then backlight goes out after 3 mins, only way to correct is to turn off and then on again, but same issue after 3 mins. My question is, surely this cant be a backlight issue if all working great then cutting off every 3 seconds??? sound is on all the time. What is telling the backlight to cut off??
Dear Sir, thank you for this video. I have a problem you described at 2:00. After turn on the TV here is a spike of output voltage to about 185V DC but it last 1 or 2 sec, after that it goes to 120V and not 160 as you said. So according to this, LED is failing and power board is most likely OK. Is that true?
hello mate, thank you very much for the well detailed video and explanation. i have the same board and i think it has the same problem so i have to replace c525 cap but when searched online there are 2 different types of it. 1uF 50V 10% x7R 1206 SMD cap and 1uF 50V 10% x7R 805 SMD cap i believe these are different size of the same cap but can you please confirm which is the one you used ? cheers.
Hi I’ve I’m in process of fixing my VESTEL board it’s for a 55 inchs Samsung model 17ips20 board number 071114 R9.. Total led strips 12 . An got 7 leds on each strip 84 leds in total 3v Each . They are driven by 4 wires feds on the power board 2 for each set of 6 strips . I’m getting only 104 v from each fead and getting very low brightness on the leds . Do you know why they are so low and maybe the fault or what’s the leds feads volta output ? Thanks ,
Hi. Thanx for the detailed video!! I have got a 40" with no backlight: There are 125V over the six hughe diodes where 180V are supposed to be. 125V as well on the diode a bit higher on the top right side. Over the hughe cap on the left side there are 380V. So, I have changed the driver MPS3394 and the MOSFET MDD14N25. But there is still no backlight. In regard that the TR300 seems to be driven well with 380V, what else could it be?
Glad I found your video, I've the same issue, no backlight. I have just under 160v on LED+, changed the backlight driver IC, at startup, backlight flashes just enough to see boot picture. So, I guess it's shutting LED drive down, would I get this if some LED have failed?
This repair was some time ago@@seksualusisI think the issue was burnt out LED's which killed the original backlight driver, I fixed that then it fired up but because the wring current was flowing it shut down.. Then I trashed the TV by cracking the panel but I fixed the back lights!!! I then purchased a backlight tester and used it fixing another TV that ended in disaster, got lightening damaged psu PCB, replaced that with one of millions found on eBay, fired it up, no backlight.. Seller said, oh yes, it'll be your backlight, checked them, nothing wrong with backlight, all lit up same brightness then... Cracked screen putting it back together... Damn TV repairs.. Got a refund but was really cheesed off destroying what would have been a cheap repair.
@@nickjones886 Still fighting mine. It has no base operation voltages (like 12V for mainboard), but has 300V from rectifier/PFC. The problem is, it is quite crappy design, scheme shows elements that are not actually present, and in current situation complicated to discover what is at the failure, as it is chicken/egg, not something sequential. May have to learn in detail how this power switching circuit is supposed to operate.
Hello Reecey! I have the same power supply! After replacing three shorted diodes sb5100 now my tv turns on but after the philiphs logo i hear a wistle sound and the tv turns off and again on and does the same thing. I cheched that all led turns on and they do. Also updated the firmware!I messured the voltage on the output for the led lights and i have 190 in the beggining and 150 later. what could be wrong?
Hi there. Great videos> Can a 17IPS20 board (same Voltages and screw positions?) be swapped out no matter what makes the TV is? I believe Hitachi, Polaroid and Bush all use this board.
Hi Reece, I wondered if you could shed any light on my tv. My backlight works fine when the brightness is dimmed down but when the backlight is turned up it cuts out completely. I am now watching tv with a low brightness screen. Also when a usb device is plugged in - this cuts out the backlight too. Could you help please?
Hy, what should be the voltage output normally for a Telefunken T39FX182DLP 39"? I put there 167V through a 4.7K resistor, but I've got 167V on the LEDs despite that resistor being in series with the LEDs, I tried then with 100ohm and with no resistor and the backlight is the same, barely lighted. I want to sweep that board for a different one, with a simple design that I have, but I need to know the voltage.
@@MrReeceyburger123 Is there a maximium current these leds can draw above which the driver circuit will shut them down? I read somewhere that there may be a 200ma upper limit which the driver circuit will suddenly role back.
Hi there just wondering if you could help diagnose my TV witch turns on for a minute lighting up backlights then powering down it has a vestel 17ips20 power supply any help would be much appreciated many thanks
I've got 17IPS20S that works ok for few hours. But then it switches the backlight off. If I turn the TV off and wait for few minutes I can get backlight again for few seconds and than it turns off. It would be better if it would stay off all the time for the diagnostic purpose. Any ideas about this problem? When it's working I get 167V between chasis and red wire and 25V between chasis and black wire.
Hy my friend! I have the same board, and i have repair it but the tv not go on ! If you press the on bottom the red Stand by led blinks 4 or 5 times and then nothing happens. The power supply is working and i have 121 Volts on the white connector to the LEDs. and also I have 12v on the black connector! What else can it be ???
Hi I have a 17ips20 r6 I get a flash from the backlights when first turned on then black screen the diode to the led fluctuates between 83-85v any ideas thanks
unfortunately it is not always so easy my card seems all ok but no led I also changed ic mp3394s but nothing always in protection! changed the mosfet but nothing
Hello, I have the same problem and the same card. I wanted to know what should be the output voltage at the connector CN501 (connector that powers the LEDs)? I have 100V, so is it the right voltage and is it the LEDs that are dead or not? Thank you.
One might check first, if he has about 400V on big caps, as measured here. If it is way lower, this may involve earlier stage, just like it was suggested. Even though this earlier turned to be caused by short at the end, being connected.
Some good info. I'm looking at a polaroid 49" curved screen. I unplugged the LED's when i turn the screen on it flicks to 200V DC on each of the 2x outputs and then drops slowly down to around 2V dc as the 2x 250V caps discharge with only the multimeter connected. Could it be feedback from the brightness control, perhaps the opto isolator or even the driver fet for the transformer from the switching side to the dc side. Any ideas?
where did you get your mps3349 chips from? I have a vestel 17ips20 in the back of my TV and its measuring at 120volts I assume its that chip that has gone down. need to find out where to buy. cheers
I have the same psu problem, but I have 120volts steady on the six diodes and 380volts on the left cap.Also I hear a strange sound coming from the pcb.Any idea?
There is a few models using the referebce 17IPS20. My 55ao2usb is compatible with 17IPS20 taken from other models ? The tv is shutting down the ledpanel after some heavy work like, 3D movies from PC HDMI, and one or 3 times using the internet. I want to replace, but I dont know If a can use any 17IPS20
It can stand days weeks without shutdown just the screen (sound continue play), but when I connect the PC+HDMI to see 3D movies, the tv only can take some ~30min, then I need to turn off and on again in the remote, and everthing is ok
MY Vestel 17IPS20 is for an 40" TV and has the issues that i have no 100v on the output for the Backlight. but who can i find the Schematics for this. The backlight turns on for under one second. After i turn on the TV
@@MrReeceyburger123 Ah I have the exact same board and 40 inch panel. What is a typical current draw from these leds?. I have used an external power supply and the leds are drawing 150ma, is that normal?
I to every one, I have a 171PS20 and C312 is missing , does any one no the value of it please. The cap is across Q301 on the big black heat sink, just it`s pin`s there.
Very nice video,I enjoy watching all of them from you.I would really love to see you troubleshoot main boards as well as you do power boards.
Cheers buddy, I have done in the past theres a couple of videos on my channel :)
So. One only little capacitor SMD shortcircuited was the whole problem?
My mama!!! Spend lot of hours to find it. I hope it deserve the work.
Congratulations.
Thanks
Thanks man nice one.
Really good informative video's..I have the same board on a jvc led tv..but have no standby led..can you point me as to where the problem could be...thanks
That was very difficult failure! Nice work.
Cheers :D
Damn, mine needs a new led control chip, maybe the same as yours but I'm not sure
Siempre los putos C , Diodos y MosFet -N y menos paro tambien una Resistencia en el circuito de Hig ...... Saludos.
Please, do you have the pinout for the connector to the power supply board?
I cannot get any information on this. I would like to know which pins are ps_on, bl_on etc.
As to C525, I came today across notion, that this ceramic cap can be replaced by 47uF 100V electrolyte. You find space provided for it on the other side, marked C521. Both ceramics (similar third one, too) are reported as frequent to fail. Thanks for your lesson!
hi fella fantastic video m8, i fix tvs for a hobby love doing it, i've got a polaroid, p40led14, with no backlight i've tested the red wire 117 volts coming off it and stays there, but at this voltage does it like one of the leds has shorted, thanks for your time,
Hi mate thanks for the comment, if its stuck at 117 volts the driver chip MP chip as shown in the video is normally the cause.
hello reecey, cheerrs for videos and all you do but have yet to find a fix for same model except all works great and then backlight goes out after 3 mins, only way to correct is to turn off and then on again, but same issue after 3 mins. My question is, surely this cant be a backlight issue if all working great then cutting off every 3 seconds??? sound is on all the time. What is telling the backlight to cut off??
REECE dont forget you changed mainboard so actual time of tv use is not correct , as mainboard was replaced,
Dear Sir, thank you for this video. I have a problem you described at 2:00. After turn on the TV here is a spike of output voltage to about 185V DC but it last 1 or 2 sec, after that it goes to 120V and not 160 as you said. So according to this, LED is failing and power board is most likely OK. Is that true?
did you manage to fix this? got the same error
@@franzjonshon7195 No, the faulty Tv is sold as parts…
@@asv5769 damm it, did you check if the leds were ok? i just opened it and found 2 leds not working properly
hello mate, thank you very much for the well detailed video and explanation. i have the same board and i think it has the same problem so i have to replace c525 cap but when searched online there are 2 different types of it. 1uF 50V 10% x7R 1206 SMD cap and 1uF 50V 10% x7R 805 SMD cap i believe these are different size of the same cap but can you please confirm which is the one you used ? cheers.
Hi I’ve I’m in process of fixing my VESTEL board it’s for a 55 inchs Samsung model 17ips20 board number 071114 R9..
Total led strips 12 . An got 7 leds on each strip 84 leds in total 3v Each .
They are driven by 4 wires feds on the power board 2 for each set of 6 strips .
I’m getting only 104 v from each fead and getting very low brightness on the leds . Do you know why they are so low and maybe the fault or what’s the leds feads volta output ? Thanks ,
Hi. Thanx for the detailed video!!
I have got a 40" with no backlight: There are 125V over the six hughe diodes where 180V are supposed to be. 125V as well on the diode a bit higher on the top right side. Over the hughe cap on the left side there are 380V. So, I have changed the driver MPS3394 and the MOSFET MDD14N25. But there is still no backlight. In regard that the TR300 seems to be driven well with 380V, what else could it be?
osoletio did you find a solution? I have exactly the same symptoms. What should I check?
Glad I found your video, I've the same issue, no backlight. I have just under 160v on LED+, changed the backlight driver IC, at startup, backlight flashes just enough to see boot picture. So, I guess it's shutting LED drive down, would I get this if some LED have failed?
I guess picture wouldn't come at all. Most likely power supply at the issue.
This repair was some time ago@@seksualusisI think the issue was burnt out LED's which killed the original backlight driver, I fixed that then it fired up but because the wring current was flowing it shut down.. Then I trashed the TV by cracking the panel but I fixed the back lights!!! I then purchased a backlight tester and used it fixing another TV that ended in disaster, got lightening damaged psu PCB, replaced that with one of millions found on eBay, fired it up, no backlight.. Seller said, oh yes, it'll be your backlight, checked them, nothing wrong with backlight, all lit up same brightness then... Cracked screen putting it back together... Damn TV repairs.. Got a refund but was really cheesed off destroying what would have been a cheap repair.
@@nickjones886 Still fighting mine. It has no base operation voltages (like 12V for mainboard), but has 300V from rectifier/PFC. The problem is, it is quite crappy design, scheme shows elements that are not actually present, and in current situation complicated to discover what is at the failure, as it is chicken/egg, not something sequential. May have to learn in detail how this power switching circuit is supposed to operate.
Any idea why there would be variable voltage on the LED output circuit?
Tested all LEDs and they all illuminate individually. Might there still be a problem with them?
Hello Reecey! I have the same power supply! After replacing three shorted diodes sb5100 now my tv turns on but after the philiphs logo i hear a wistle sound and the tv turns off and again on and does the same thing. I cheched that all led turns on and they do. Also updated the firmware!I messured the voltage on the output for the led lights and i have 190 in the beggining and 150 later. what could be wrong?
EN ESPAÑA DECIMOS...TE MUEVES MAS ..QUE LA COMPRESA DE UNA COJA ..JAJAJAJAJA UFFF ME HAS PUESTO DE LOS NERVIOS
Can you just put a resistor on the negative side of the leds to ground for a fixed brightness?
I’ll let you have a play with that theory 😉
forget all that if the drive is overloaded with too much white lite put 300 ohm resister in line with the positive
Hi there. Great videos>
Can a 17IPS20 board (same Voltages and screw positions?) be swapped out no matter what makes the TV is? I believe Hitachi, Polaroid and Bush all use this board.
Check for product codes to match, also if LED connector meets your plug. There are variations out there.
Hi Reece, I wondered if you could shed any light on my tv. My backlight works fine when the brightness is dimmed down but when the backlight is turned up it cuts out completely. I am now watching tv with a low brightness screen. Also when a usb device is plugged in - this cuts out the backlight too. Could you help please?
Hy, what should be the voltage output normally for a Telefunken T39FX182DLP 39"? I put there 167V through a 4.7K resistor, but I've got 167V on the LEDs despite that resistor being in series with the LEDs, I tried then with 100ohm and with no resistor and the backlight is the same, barely lighted. I want to sweep that board for a different one, with a simple design that I have, but I need to know the voltage.
Is there a maximium current that the power supply will allow to the leds and what would be an allowable current??
The PSU output is designed for each panel size worth if leds 😁
@@MrReeceyburger123 Is there a maximium current these leds can draw above which the driver circuit will shut them down?
I read somewhere that there may be a 200ma upper limit which the driver circuit will suddenly role back.
Red is negative on these vestels on the backlight connector ..daft
Hi, I have a problem with this power supply. The TV has no backlighting and the voltage on the connector that goes to the LEDs is 65V and not 115V.
The same
My case exactly. I also have about 300V on big caps, instead of 400V. These ceramic caps are first suspects, if not around.
Can I use a backlight boost board to bypass the curcuit
Hi there just wondering if you could help diagnose my TV witch turns on for a minute lighting up backlights then powering down it has a vestel 17ips20 power supply any help would be much appreciated many thanks
I've got 17IPS20S that works ok for few hours. But then it switches the backlight off. If I turn the TV off and wait for few minutes I can get backlight again for few seconds and than it turns off. It would be better if it would stay off all the time for the diagnostic purpose. Any ideas about this problem?
When it's working I get 167V between chasis and red wire and 25V between chasis and black wire.
Hy my friend! I have the same board, and i have repair it but the tv not go on ! If you press the on bottom the red Stand by led blinks 4 or 5 times and then nothing happens. The power supply is working and i have 121 Volts on the white connector to the LEDs. and also I have 12v on the black connector! What else can it be ???
what is the voltage coming out of the diodes screen? Its 180v?
Hi I have a 17ips20 r6 I get a flash from the backlights when first turned on then black screen the diode to the led fluctuates between 83-85v any ideas thanks
thanks!
No worries :)
Can you help backlight goes off after some time charged power supply charged motherboard can it be a led
Hey. do not tell me that the mosfet is on the position of q505?
unfortunately it is not always so easy my card seems all ok but no led I also changed ic mp3394s but nothing always in protection! changed the mosfet but nothing
That's completely different to the 17IPS20 board in my tv mine doesn't have those 6 diodes and before you say mine must be the p version it's not
hello 17IPS19-5P power supply , no back light !!! i check the VCC 24V only ??? please can you help me ?
I have the same PSU but it is clicking like a clock continuously what can be the problem?
I'm getting getting crackling on power but no power led... no back-light at all. Capacitors all look fine. Any ideas?
Its the board without the row of diodes.
Sounds like a short on the board somewhere. You need a DMM to test, power disconnected.
Hello,
I have the same problem and the same card.
I wanted to know what should be the output voltage at the connector CN501 (connector that powers the LEDs)?
I have 100V, so is it the right voltage and is it the LEDs that are dead or not?
Thank you.
One might check first, if he has about 400V on big caps, as measured here. If it is way lower, this may involve earlier stage, just like it was suggested. Even though this earlier turned to be caused by short at the end, being connected.
Some good info. I'm looking at a polaroid 49" curved screen. I unplugged the LED's when i turn the screen on it flicks to 200V DC on each of the 2x outputs and then drops slowly down to around 2V dc as the 2x 250V caps discharge with only the multimeter connected. Could it be feedback from the brightness control, perhaps the opto isolator or even the driver fet for the transformer from the switching side to the dc side. Any ideas?
Hmm is the 200v there then collapses with the leds in ?
What did he use to check the cap, diode mode or resistance mode?
hi mate i have a 17ips20 power supply and also have no backlight, if one led goes out will it prevent the others working?. tia
Yes.
where did you get your mps3349 chips from? I have a vestel 17ips20 in the back of my TV and its measuring at 120volts I assume its that chip that has gone down. need to find out where to buy. cheers
Hi mate I got the chip off an ebay seller called Tekkid he sells them for a good price.
+MrReeceyburger123 I can't seem to find him on eBay. the chip I have is mps1333 could you find a link and post it please. thanks. dan
Hes sold out thats why just checked :L
I have the same psu problem, but I have 120volts steady on the six diodes and 380volts on the left cap.Also I hear a strange sound coming from the pcb.Any idea?
What you tested ?
I have change MP3394S controler,I have checked all mosfets Q301,Q211,Q100,Q502,Q101, are OK ,all diodes are ok.C525 OK, C127 OK.
Hi my TV voice works but not video. What is the problem?
There is a few models using the referebce 17IPS20. My 55ao2usb is compatible with 17IPS20 taken from other models ?
The tv is shutting down the ledpanel after some heavy work like, 3D movies from PC HDMI, and one or 3 times using the internet.
I want to replace, but I dont know If a can use any 17IPS20
Replace the mainboard if its turning off randomly.
It can stand days weeks without shutdown just the screen (sound continue play), but when I connect the PC+HDMI to see 3D movies, the tv only can take some ~30min, then I need to turn off and on again in the remote, and everthing is ok
Replace the mainboard.
MY Vestel 17IPS20 is for an 40" TV and has the issues that i have no 100v on the output for the Backlight. but who can i find the Schematics for this. The backlight turns on for under one second. After i turn on the TV
www.arizanotlari.com/2018/07/vestel-regal-seg-lcd-led-plazma.html#more
What size tv is this?
40"
@@MrReeceyburger123 Ah I have the exact same board and 40 inch panel. What is a typical current draw from these leds?. I have used an external power supply and the leds are drawing 150ma, is that normal?
I got positive to negative 0 in led output, but positive to chasey its 157v. What could be wrong?
Samianas230 just find out for yourself
Negative
Please tell me: what is value of capacity of this C127?
i realize it's quite off topic but does anybody know a good place to stream newly released tv shows online ?
@Bentlee Briar Try Flixzone. Just google for it :)
@Bentlee Briar I would suggest FlixZone. You can find it by googling =)
got a jvc tv with a 17IPS20 board , powers on but picture is faint , what is the problem please
Hello please post on badcaps.net I will help there.
I to every one, I have a 171PS20 and C312 is missing , does any one no the value of it please. The cap is across Q301 on the big black heat sink, just it`s pin`s there.
5:47 i just blew out the tv with that :(
:(
I to every one, I have a 171PS20 and C312 is missing , does any one no the value of it please.
whare do i get a mp3994s mate
or MPs 1344
but ime not saying ignore video as its good but a quick fix 300 ohm