Re: Vizio v705-H1 half of display messing up
Here are more pictures. Its really hard to notice when all the colors are dark. Its bright colors that cause it to happen....
Jtroutt19
Senior Member
Last Activity: 03-12-2023, 01:49 PM
Joined: 08-13-2011
Location:
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Vizio v705-H1 half of display messing up
Hello,
My main living room tv just started doing this today all of sudden. Hoping it will be something simple like a replacement board. Any ideas?... -
Re: Samsung UN55KS800DF
So this doesn't have the normal tcon board....Leave a comment:
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Re: Samsung UN55KS800DF
Borrowing an O-scope is prolly gonna be a problem. Not sure I know of anyone with one. I will ask around.Leave a comment:
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Re: Samsung UN55KS800DF
no the OSD does not work.Leave a comment:
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Re: Samsung UN55KS800DF
Ok purchased new main board. Now I'm getting a display but it's showing up like this?...Leave a comment:
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Samsung UN55KS800DF
Hey guys this unit power cycles with no image but backlight does come on and then shut off. Unplugging the cable in the picture makes the backlight stay on but no response other than that from it. I am assuming main board is faulty wanted to double check before I spent money. Thanks!!... -
Re: LG 65UB9200 no image or sound
Yes back light does come on. I do not see any dim spot or anything. Looks great.
This mean I am looking at a bad main board correct?
Or would it be possible to repair the main board? What causes this particular issue?Last edited by Jtroutt19; 08-08-2018, 03:21 PM.Leave a comment:
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Re: LG 65UB9200 no image or sound
No I hear a click from the power supply like it is turning off. Then nothingLeave a comment:
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Re: LG 65UB9200 no image or sound
ok here are Voltage for the main connector. First column is power off second column is power on.
[CODE]
Column 1 OFF:ON Column 2 OFF:ON
SIN- 0v:0v V-SYNC- 0v:0v
SCLK- 0v:0v GND
GND GND
24v- 0v:24.8v 24v- 0v:24.8v
24v- 0v:24.8v 24v- 0v:24.8v
GND 24v- 0v:24.8v
12v- 0v:11.78v GND
12v- 0v:11.78v 12v- 0v:11.78v
12v- 0v:11.78v 12v- 0v:11.78v
GND GND
3.5v- 3.5v:3.5v...Leave a comment:
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Re: LG 65UB9200 no image or sound
Ok I remember being told that before now. Sorry. I will get that info first thing tomorrow.Leave a comment:
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LG 65UB9200 no image or sound
You can hear the initial click from the power supply when you hit the power button but there is no image no backlight and no sound.
Less than 1v per led pin at the connector for the backlight.
When the unit is on voltage at the main board connector is good. There is a small red led on the power supply board towards the backlight connector. It flashes 5 times and then pauses for about 7 seconds before flashing again.
Is the P/S bad?... -
Re: Questions about leds in series.
Yeah no that is not what I am using. I soldered the leds to the Star MCPCB board myself both leds and the MCPCB’s were purchased through mouser. The star boards are then attached with some thermal glue to a large heat sink. A fan will be mounted if needed. I am not planning on running these past 80%. Thats said I realized a fan could not hurt it will just lower the temp and in effect cause the leds to last longer. I plan on monitoring temps for the first 24 hours to see high high they get. Probably wire up a quick temp sensor with arduino...Leave a comment:
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Re: Questions about leds in series.
The reason I was just going buy a driver made for driving leds. I understand what you are saying though.Leave a comment:
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Re: Questions about leds in series.
[url]https://cdn.badcaps-static.com/pdfs/d3aa222cc3fb1a96f6e6d92fe64ea173.pdf[/url]
Data sheet for themRe: Questions about leds in series.<...sheet for themRe: Questions about leds in series.
[url]https://cdn.badcaps-static.com/pdfs/d3aa222cc3fb1a96f6e6d92fe64ea173.pdf[/url]
Data sheet for themLeave a comment:
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Re: Questions about leds in series.
I looked st those drivers the meanwel you mentioned but came across the MeanWell HLG type A ones as well figured it would suit my purposes betterLeave a comment:
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Re: Questions about leds in series.
Ok great info thank you.
This is the link to the driver I was thinking of using
[url]https://www.ledsupply.com/power-supplies/mean-well-hlg-series[/url] the type A one which from the description says this
The A-type HLG products are IP65 rated and include on-board internal potentiometers where the output voltage and current can be adjusted. These models have the two black circles that you see on the top side of the product. This is where the adjustment is made. The range of adjustment is noted for each model in...Leave a comment:
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Re: Questions about leds in series.
Ok maybe I am not explaining my thoughts correctly. I am trying to learn here.
I know a typical leds works over a range of currents. I am also aware they are current driven devices and no I am not wanting to drive the leds at full power. I am not wanting to do a sloppy design I am wanting to understand the why behind the correct design. Not oh it’s just that way. I want to know why it is that way.
I am not against accepting reality. But again I want to understand that “reality” I have thought I have...Leave a comment:
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Re: Questions about leds in series.
Why is that. Why the difference between resistors and diodes. Because resistors will drop an amount of voltage based on its resistance. Don’t leds have an internal resistance that allows it to drop a certain amount of voltage?Leave a comment:
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Re: Questions about leds in series.
A lot of what I am reading elsewhere says that you can run different Vf leds in series and that in parallel they would need resistors. I did a little experiment last night and setup a little 15 led string of blue and red. I powered with right at 40v every led cane on and the string was pulling 400mA. Using an infrared temp gun each led was heating up the same. I am going to get an adjustable driver both current and voltage and try it again with corrrct voltage to drive them at 80%.Leave a comment:
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