Hey all well I just replaced the defective power supply in this funai made 22 inch led tv.I would have just repaired the power supply but it blew some components out on the hot side and finding all these components would exceed what they use power supply would cost on eBay. So anyways now that I put it back together what is going on is it seems there is a strobe light effect on LED backlighting its really consistent Flickr and it's super fast in you can hear the power supply ticking as the strobing is going on. I pulled the panel apart and every single LED is lighting up so it doesn't seem like its a burned-out LED. Has anyone run into this before on a backlit LED edge lit TV yet?
-
Did I leave the soldering iron on? -
Re: 22me402v led tv strobe light effect
Does anyone know around what voltage these leds are supposed to operate at?.Did I leave the soldering iron on? -
Re: 22me402v led tv strobe light effect
For a 22inch if it has a single strip of LEDs around 40 to 50V.
Check the voltage across the 200/400/450V capacitor.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 22me402v led tv strobe light effect
Thanks Tom. Yes im getting 41v from ground to the middle pin. There's 5 pins total. Middle.pin seems to carry the voltage.
And yes one light strip.Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Voltage across main cap is 165.4vdc. The main cap is a 200v 100mfd.
The 5 pins out to the led strip are
1. Led4
2. Led3
3. NC
4. V LED
5. NC
6. Led1
7. Led2
power supply model ba21n0f0102Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
by the way I forgot to mention that the flickering effect on LED strip seems to be that of they are not lighting up to their full capacity so the screen is real dim when those LED's are flickering it's almost like they're loading down or something. Seeing them flicker is almost like looking into a strobe light. Thats how fast the flickering effect is.Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Approx how many LEDs on each strip?
40V is only enough for about 10 to 12 white LEDs. I'm guessing it has around 40 to 50. The way these designs work is they put four parallel strips of series LEDs, one end attached to 40V and the other going to a constant current sink, that's the outputs LED1,2,3,4 which should measure near 0V. That way each chain of LEDs gets the same current. LEDs aren't perfect, their voltage drop and hence current through them varies, which means they can't be directly put in parallel.
What can happen is if the constant current sink can't regulate the current they will flicker.
Can you post some clear detailed photos of the power board? Top and bottom sides.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 22me402v led tv strobe light effect
Last edited by freakaftr8; 09-22-2013, 09:04 AM.Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
See photo..Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
-
Re: 22me402v led tv strobe light effect
Yes that is the connector. And the other part is the regulator? All pins led 1 thru 4 all registered around 0v
there are 34 leds on the strip.Last edited by freakaftr8; 09-22-2013, 09:48 AM.Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Probably, can you get the part # of it?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 22me402v led tv strobe light effect
Really hard to read.
Ai
209pcDid I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Try an angled light or using the macro mode on a camera.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 22me402v led tv strobe light effect
I guess what I'm getting at is there any chance the LED strip to be bad or is this bad power supply you think
what I see on the ic is all I can getDid I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
I think it's probably a bad power supply more than an LED problem.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 22me402v led tv strobe light effect
Ok. Thanks I'll talk to the people I got it fromDid I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
I just got to thinking about something. Whats the possibility that the mainboard is throwing it for a loop. In the bl_on or bl_dim? Ones at 2.9v and the other is at 3.3v when on. These voltages are taken off the ribbon connection between the mainboard and the power supplyLast edited by freakaftr8; 09-22-2013, 12:58 PM.Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Yep thats it! Was that you're problem with yours?Did I leave the soldering iron on?Comment
-
Re: 22me402v led tv strobe light effect
Huh, can't find anything on that chip...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
Have had two Acer K272HUL monitors die with the same symptoms:
- Blue power light is illuminated while the monitor is plugged in
- Black screen (no splash screen, etc.)
- Power button doesn't do anything
Opened it up and checked for bad caps and components, evidence of burns, etc. - everything looks fine.
Power supply voltages are fine.
There are some signal lines on the power supply harness that goes from the power supply to the logic board, not sure what these should be at.
Anyone have any ideas?...12-09-2023, 10:22 PM -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.
i know that in linear power supply the noise will be very low comparing to SMPS supply....
Comment