Re: Samsung ln46b530p7n dark colors messed up
I took some more pictures of the issue, and then the issue went away and the colors were normal. So far it's stayed that way, but I'm mostly expecting it to go back at some point. So now it's fixed? I'll update you if it comes back and I need some input.
RoboDisko
Member
Last Activity: 08-27-2019, 06:00 PM
Joined: 12-23-2013
Location: Idaho
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Re: Samsung ln46b530p7n dark colors messed up
I forgot to mention that I have reseated both ends of the LVDS cable, as well as the 2 cables from the tcon to the 2 top distribution PCB's that probably have a name that I don't know. This didn't change anything. Didn't inspect them carefully though, so I might go through and inspect/clean.Leave a comment:
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Samsung ln46b530p7n dark colors messed up
Recently got the listed TV. On the TV, 0 levels of color are black as you would expect, but 3-127 of each color are all about the same mid-color shade. 1 and 2 are rapidly approaching the mid shade of the color. Values above 127 look about right. So images that are only bright look totally fine, but anything that's more dark looks wrong. This persists on TV generated test patterns. I've factory reset the TV with no change. It's been a while since I've repaired a TV, and I'm not sure where I should start. Maybe TCON? Just looking for ideas. The problem allegedly started when the TV was moved.... -
Re: Component identification on graphics card
I'm guessing you're 100% right! I can find product offerings that meet those specs with the same physical package size as the ones I desoldered. Man, those suckers can be pricey! Mouser lists 330uF tantalum 7343 caps up to $30 each! Lucky, the ones I want are also the cheapest at $.73 each! (lowest ESR, one voltage range higher than I think I need) I'll get some ordered and let ya know how it goes.
By the way, anyone have a use for 16 b330a diodes?
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Re: Component identification on graphics card
Ultimately, all of the capacitors are connected in parallel, as well as all the downstream logic. Line reads about 3 ohms on one and 4 ohms on the other. The non-working one that I'd expect to be shorted is the 4 ohm one.
I was adding leaded solder to the joint, but the quality iron wouldn't melt the joint to spread the lead, and by the time you melt the joint with the higher temp iron completely, I found it more effective to pull it off instead of trying to mix up a reasonable solder blend. This certainly isn't my first...Leave a comment:
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Re: Component identification on graphics card
And just before someone suggests removing and testing a component, I would like to add that I have attempted pulling 2 of the caps already. They use some crazy high-temp solder, and my "good" soldering iron isn't hot enough to melt it. (It's a metcal fixed temp.) My cheap-O adjustable soldering iron does get hot enough to melt it (It'd get hot enough to melt itself if you let it,) but by the time the component comes off, there is typically not enough of it left for an accurate test. If it comes to it, I'll pull one off and...Leave a comment:
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Component identification on graphics card
Hey. I've got a pair of 980ti graphics cards that I'm trying to get working. I bought the pair of them 'broken,' but one of them was working great. Then one day I noticed it wasn't working as well, but still working ok. Due to unbalanced power draw on the 2 pcie power connectors as well as early power throttling, I figured it was a VRM issue. Took it out to fix it up.
These cards have an 8 phase VRM. On the output there is a pair of components is parallel that look like diodes. On the non functional card, 2 of these components appeared burnt. On the functional card, 1 appeared burnt.... -
Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
Ok there are 2 different sets of IGBT's, and the one that is putting out the heat, and thus I expect is the problem, is the one that has the same model # IGBT's as it originally had.
FYI I'm doing component swaps on the original 1080p board, using the 720 for parts. So the coils are the 1080p coils. And a quick visual inspection, the coils appear the same. I didn't measure them or anything....Leave a comment:
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Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
Ok.
I looked again and I found another one of the fgpf... ones. Swapped it in, turned it on, it turned on.
And moving along to my next problem...
After turning it on, it seemed to make more noise than I remember it having made with the 720p board. After about 30 seconds I could start to smell something, so it went back off. It seems that the IGBT I replaced first (Q4101) was putting out significantly more heat than it seems it should. After 30 seconds of being on,...Leave a comment:
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Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
Ok I've ran into a question.
Original setup had 2 JRP30H1's in parallel. Collector and Emitter were both directly connected, and the bases both have a 15 ohm resistor to the same driving source, so 30 ohms base to base. One of the JRP30H1's has failed.
My replacement board has only 1 fgpf4536 in the same application. Would it cause issues to run the fgpf4536 with the RJP30H1 in parallel, instead of 2 matched IGBTs?Leave a comment:
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Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
I need to remember that I have a functional board to compare stuff to, to see if it is good.
I had already checked the resistance of whatever was connected to the base, and it is 10K on both boards, so I'm going under the assumption that whatever drives it is still good.
Looking a little bit further, I found 2 areas that I though were both VS and that is why they were shorted are actually not supposed to be shorted. Looks like another bad MOSFET. I'll...Leave a comment:
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Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
I checked the resistance on the base of the MOSFETS and found one that had the base shorted to the other leads. After removing Q4101, VS and ground were no longer shorted. I pulled the Q4101 from the replacement (720p) board, and I noticed that they were different models. Looking at the data sheets made it appear that they were similarly specced from different manufactures, so I went ahead and put the MOSFET on the original broken board. VS and ground remained not shorted, so figured everything was...Leave a comment:
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Re: Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
Would have been nice to know before I bought the replacement. Oh well.
They had a 1080p yesterday for 19.50 FS! Looks like its gone now though.
That is kind of what I was thinking.
Any tips for identifying which of the 12 MOSFETS on it is bad? Is desoldering each of them individually my only option?...Leave a comment:
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Replacement X-main board with fewer components (Samsung Plasma PN51D530A3FXZA)
Hey. I'm fixing a PN51D530A3FXZA Samsung plasma TV Dated October 2011.
I figured out that there was a short on VS and traced it to the X-main board. I ordered a replacement board which came today. The replacement board is the same PCB and revision and model # etc, but has fewer components mounted on it. It has a total of 2 fewer MOSFETS, 2 fewer large capacitors, and several fewer small components. I didn't notice that it was different on the listing, but noticed fairly quickly when I had it in hand. I decided to install it anyways and see if it worked.
The TV seems... -
Re: New Members - please post your introductions here
Hey all.
I'm big into 5 spanning areas of interest
Software-Computers-Electronics-Robotics-Mechanics
As you can see, electronics is kind of at the center of all of my interests.
I fix TV's for people, and sometimes I need more help than is already on the internet. That is why I have come here.Leave a comment:
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