Hey guys. So no backlight at all. not even a flash. I'm getting 330 volts at the connector for the back light. Would mean I have a problem with the strips themselves correct?
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Re: hisense 55K20DG no backlight
Pictures of the boards with the back of the tv off may help you more with fixing your fault
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Re: hisense 55K20DG no backlight
Here is picture of backlight strips. Burned out but whyAttached Filesif you find these attachements useful please consider making a small donation to the site
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Re: hisense 55K20DG no backlight
They drive those LED to the max and with poor heat management.
Once you get it fixed you should then turn down the backlights level to as low as you can.
Yours is not as bad as the one in LG TV's.
https://www.badcaps.net/forum/showth...ht=LG+47LN5790Never 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: hisense 55K20DG no backlight
I had a Samsung 40" about a month ago that the led's got so hot it and shorted it caught the white diffuser sheet on fireDid I leave the soldering iron on?Comment
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Re: hisense 55K20DG no backlight
wow thats nutz! Thanks for the pictures. Time to order some parts.Comment
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So I have this Hisense tv where the backlight does not come on. But when it is turned on, when I shine a flashlight on the screen, I can clearly see the splash screen then it turns off. I looked at the mainboard and was expecting to see bulged capacitors, but they all look fine. I unplugged the backlight from the mainboard, and get the same symptoms (i.e. no backlight, dark splash screen then just a black screen). Is this just a backlight issues? Do Hisense tvs turn off by itself if the backlights are unplugged or are bad? Or is this a mainboard issue?
TIA. -
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 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... -
My tv still has backlight when turn on, 12v on tcon board but no picture and 6 flashing red light at power button. I already disconnected each ribbon cable in turn but the screen only had backlight and nothing changed. -
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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