Re: LG 55UB820V 4K Powers up but No Backlight
voltage at dr on pin is 1.56v and stays at 1.56v when backlights turn off
voltage at dr on pin is 1.56v and stays at 1.56v when backlights turn off
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Re: LG 55UB820V 4K Powers up but No Backlight
i wonder if the voltage is too low budm maybe able too advise but with this mainboard atleast the dr on voltage stays on when backlights go off so possible failed/failing led maybe budm has some thoughtsComment
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Re: LG 55UB820V 4K Powers up but No Backlight
Update:: sourced a replacement backlight from a new tv broken screen in transit. collecting it this evening.
In anticipation of fitting the replacement backlight assembly I have again stripped my screen to remove the suspect backlight and have found 1 led not working, I have just replaced the open led and the backlights now come on and stay on,no screen panel fitted though
So I assume once the replacement backlight is fitted all should be well, fingers crossedComment
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Re: LG 55UB820V 4K Powers up but No Backlight
yes lets hope the replacement leds fixes your issue.Comment
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Re: LG 55UB820V 4K Powers up but No Backlight
TV is now back together and working with my original led's after replacing the open led, The replacement backlight did not fit my tv,
My screen is LC550EQE replacement screen is also LC550EQE but backlight fitted in the replacement screen is slightly different, ie screw mounting holes slightly different positions, and five less led's on replacement screen.Comment
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Re: LG 55UB820V 4K Powers up but No Backlight
Glad it was a easy fix lg leds do seem too fail a lot remember too turn the backlights down may help save the other ledsComment
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Re: LG 55UB820V 4K Powers up but No Backlight
With LG you may have to turn the backlights setting to 65 for ALL the inputs.Comment
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Re: LG 55UB820V 4K Powers up but No Backlight
Yes have turned backlights down to 70, watching the tv now still fineComment
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Re: LG 55UB820V 4K Powers up but No Backlight
Excellent!Comment
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Re: LG 55UB820V 4K Powers up but No Backlight
for anyone following this thread, i have same issue, but i got brand new LED strips from LEDBarz here in the UK, all the LEDs and string test ok but DR on is missing. now i jumped 3.5v standby to DR_on and the backlights fire up when tv is switched on. is it safe to leave this cable jumped or will it cause damage ? any help appreciated thanks.
and also the tv is stuck on LG screen, does it need a replacement main ?Last edited by Mikeyboy2007; 03-12-2022, 08:23 AM.Comment
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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, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC... -
Hi all!
I've recently run into an issue with my Samsung UN55H8000AF LED TV displaying no image. I've done quite a bit of research in terms of what could be wrong with it. Below are the steps I've taken prior to reaching out here for some assistance:
1. I've tried replacing the T-Con board (BN95-01594A), twice and have still experienced the same issue with all the boards I've tested with.
2. I've tried to remove one side of the ribbon cable that goes from the T-Con board to the panel and still not getting any image on left or right side.
3. I've checked voltages... -
Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.
First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...
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