I picked up this TV with a crazy issue and I can't figure it out. It powers on, the backlight flashes for a second with a screeching noise on the Power supply then goes out and the red LED on the power supply starts flashing. I removed and checked all the caps, including the ones under the heat-sink and they seem to be good. I didn't notice any dark spots on the panel indicating a bad CCFL so I am stumped for now. Any help would be GREATLY appreciated. Pictures below
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2 ea - Samsung 52"
Samsung 60" -
Re: Polaroid TLX04243B Backlight flashes then out
First thing to try is to heat the Psu with a hair dryer and see if doing that keeps the backlight up. If not will help you further.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/ -
Re: Polaroid TLX04243B Backlight flashes then out
Ok, right do you know how to check the inverter transformers ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Polaroid TLX04243B Backlight flashes then out
No, but i can learn real quick.. do i need to remove them?Craigslist Picks & Fixes
2 ea - Samsung 52"
Samsung 60"Comment
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Re: Polaroid TLX04243B Backlight flashes then out
No you can keep them on the board, have you a Dmm ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Polaroid TLX04243B Backlight flashes then out
yes i pulled them off and tested them with my dmm.. i got 1 ohm on the primary and 13 ohms on the secondary.Craigslist Picks & Fixes
2 ea - Samsung 52"
Samsung 60"Comment
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Re: Polaroid TLX04243B Backlight flashes then out
Is that for both on the secondary output ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Polaroid TLX04243B Backlight flashes then out
Yes. it is.Craigslist Picks & Fixes
2 ea - Samsung 52"
Samsung 60"Comment
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Re: Polaroid TLX04243B Backlight flashes then out
https://www.badcaps.net/forum/attach...7&d=1459812008
The 3-leg device on the middle of the board is soldered properly? It looks like it was removed and put back in place with bad soldering works.
Also check the capacitance of those two big brown poly caps by the inverter transformers.
How is the DCV on the main filter cap, about 380~400VDC and steady?Last edited by budm; 04-05-2016, 05:07 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Polaroid TLX04243B Backlight flashes then out
He desoldered that to get at the caps though. But it does need to be properly resoldered.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Polaroid TLX04243B Backlight flashes then out
There's a few poor solder joints but the image is not well focused so there could be more bad jointsAttached FilesWilling to help but I'm no expert.Comment
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Re: Polaroid TLX04243B Backlight flashes then out
Oh yea, I took the pictures before i soldered the parts back after taking off the heat sinks and replacing the caps. everything is soldered properly that i took off..
SO now i also have a 32" version (FLX-3211B) doing exactly the same thing.. It has a smaller Power supply P/N: IPOS 150. on this one there the red light of the power supply does not flash, it's just a solid red.. exact same symptomsCraigslist Picks & Fixes
2 ea - Samsung 52"
Samsung 60"Comment
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Re: Polaroid TLX04243B Backlight flashes then out
Going back to the Polaroid set, do you have all the dc supplies as given alongside each of the connectors?Willing to help but I'm no expert.Comment
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Re: Polaroid TLX04243B Backlight flashes then out
Disregard this post, wrong TVComment
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this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered... -
Hello everyone! I've found this television, and I began troubleshooting it.
First, the television kept rapidly power cycling. I've warmed up the capacitors with a hairdryer, and after 3 dimmed red blinks, the backlight turned on, then turned dim, and no picture was present on the screen.
I believed that this was caused by a bad power supply producing insufficent power (I've measured 3.5v on the 5.2v rail), so I've blindly recapped the board.
After the recapping, all the voltages stableized, however, the issue in the title still remains.
I could... -
Hello all,
Am trying to figure out this backlight issue with this A1990 Macbook Pro.
Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure... -
Hello, got an iPad Pro A2378 12.9 5th gen with no backlight. Got another test unit without screen, tested the screen, still no backlight with the test unit.
Figured out the backlight on the screen was bad, ordred a new backlight from mobilesentrix, *carefully replaced it* without damaging the lcd, oh well.
Final result, issue is still there, the screen has no back lights. So i'm back to square one, with 3 hours less and 100$ out, issue still on the screen.
The panel is still ok, i can see the apple in the middle of the screen when it kicks in, just no backlight.
Anyone...
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