Re: LH70BVPLBF/ZA samsung 700DX2 power issue
[url]http://m.ebay.com/itm/182472333357[/url]
This is what I bought to replace the ccfl's. 10 meters of the cool white 5050.Re: LH70BVPLBF/ZA samsung 700DX2 pow...ol white 5050.Re: LH70BVPLBF/ZA samsung 700DX2 power issue
[url]http://m.ebay.com/itm/182472333357[/url]
This is what I bought to replace the ccfl's. 10 meters of the cool white 5050.
Tonycjr23
Member
Last Activity: 04-23-2017, 12:25 PM
Joined: 03-25-2017
Location: Providence Rhode Island
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
I'm not really worried about hotspots in the pic, there's a ton of room to mess with positioning of the strips once they're all wired in now that the ccfls have been removed, my question is where can I find 12v at the needed 6Amps for this home made led "array". I bought a separate power supply for them just in case I couldn't find it but I'm not even worried about heat dissipation because the entire surround is aluminum so all the heat will be dispersed well, I'm more worried about safe operation and not having to do the hokey...Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
As far as a kit i realize I'm on my own with it. There is actually a ton of room on this thing inside the casing to hide a power supply, a power supply of which based on my math will need to be 12v and at least 10 amps for the length as far as I'm reading I'll need at least 10 meters of led tape which is about 600 led's, and laid out horizontally I should only need 6 pieces at most. the tape I'm going to use has 5050 led's and from what I read I should use is coolest white possible, please correct me if I'm wrong about my choices and...Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
Well honestly I'm not above turning it into a light box with a separate driver to power the led's without having to tap into the existing power. but please save me a lot of aggravation and tell me whyLeave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
I've concluded that the ccfls are actually bad, I can get a picture with the inverters all unplugged but no backlight, my goal now is to replace them all with an led array, is this a futile attempt at resurrecting this thing? How easy is it to replace them with an led array, it's a pretty sweet unit judging by the others I've seen still operational. Any tips in advance to adapt this thing to led's would help greatly, thanks in advanceLeave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
well I unplugged each inverter board and plugged them in one by one until the set turned off, turns out it was the number one board that was causing the fault and causing it to shut off. Is that typical of an lcd monitor where an inverter board will cause it to shut down entirely? what are the chances of that being my only problem and it not being either the circuit from the board feeding the number one or possibly being the ccfl bulb itself? the monitor is considered digital signage so its made for 24/7 use. it has cooling fans for each...Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
So a small update, I got down to the capacitors and they were all metered out to be good. I started pulling the jumpers between components and I came to the inverter controllers, with all of them plugged in the set turns off, so I started unplugging them one at a time and pressing power, sure enough one of them finally made the set turn off with being connected and when disconnected the set stays on fine but no backlight. I ordered a replacement on eBay that identically resembles the board I pulled except for a few numbers on the serial...Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
How would I do that safely? I realize that one crossed trace or a wrong probe tap somewhere and the units cooked, plus the mix of high voltage I would like to not zap all of it, or myself, can a rectifier be tested with the board removed? And the capacitors? Can they be accurately tested without the board installed? I feel like they're all basic questions but they're legitimate questions, I want to do this right, thank you for all the help in advanceLeave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
The clicking I'm not too worried about, I know relays make clicks, it's that hissing like its a bad cap somewhere that I can't see, do they ever leak from the side with the leads?Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
Is the hissing even a problem I should worry about?Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
I'm not able to Check temperature because it will not stay on for more than 2 seconds, but is the noise anything I should consider suspicious?Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
I figured out how, working my way through the forum little by little, electronics repair intrigues me so I will be posting a lot and have a lot of questions as silly as some may be
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
The first picture is the board that is suspected to be the trouble, it is the one making the noise yet just by a quick view it doesn't look like any caps are bad
The second pic is the group of caps I've narrowed the noise down to, does anyone see anything out of the ordinary or suspect to cause trouble?...Leave a comment:
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Re: LH70BVPLBF/ZA samsung 700DX2 power issue
I'm operating on my phone right now but last night I seem to have narrowed down a cluster of caps that seem to be making the noise I'm describing, it's almost like the sound that firewood makes when it's thrown into a fire without curing the moisture all out of it.
Does anyone have an idea as to how I can post the pics I've taken from my iPhone photo gallery or do I have to upload them to flicker or a photo storage place, it won't allow me to upload pics without a URLLeave a comment:
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LH70BVPLBF/ZA samsung 700DX2 power issue
Hi guys, this is my first post so ill be as descriptive as possible, I have a display that was given to me, the model number is LH70BVPLBF/ZA
I realize its a monitor, not a tv, it was given to me by my place of employment because they didn't think it was worth troubleshooting and repairing given the cost of newer cheaper units but me and my mechanical brain says wow, a 70 inch dumped on me for nothing. BUT OF COURSE!!
anyway, plugging it in and hitting power leads the unit to cycle on, its a display that's got cooling fans in it so it was designed for 24/7 usage like the... -
Re: New Members - please post your introductions here
Well here's my hat! Even though my dang head is so big I've never physically worn a hat in my life, I'm Tony, not certified in anything besides having a serious mechanical brain and determination to figure out how things work, I'm Hoping to learn a lot from you guys and can't wait to make my first post and learn my first board level repair. There's something about being able to say for one, I saved an expensive piece of electronics from the trash got more life out of it, thanks guys and galsLeave a comment:
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