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The Vankyo V7000 (YG551) projector delivers a Full HD 1080p resolution with 3,800 lumens of brightness. It was released in 2020.

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Why is there a big brown/yellow/black blob on Vankyo projector screen?

The Blob is here. Started off as a speck and it continues growing. I received this projector from a friend and it's always been fine but recently it's been dimming out (not sure if that means I need a new bulb?) aaand started forming a blob in the corner of the screen. I ain't too tech savvy, but I'd hate to buy a whole new projector if I'm able to fix it myself or order parts for someone else to fix. Picture included..any suggestions or solutions greatly appreciated.

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The LCD panel is burned and very discolored. This is a very common failure in these cheap projectors. It can either be the LCD (very unlucky) or the polarizer filter (lucky), but they tend to cook the replacement part as well a lot of the time without a fan upgrade: Brown smudge/spot on the projection image about 1/6th of total picture. This is where a big issue comes from in repairing this...
Even portable Epsons like the PL 1751 tend to survive better with hot running lamps since the lamp is in a dedicated area, with a fan running full time to cool it down. The reason the nicer ones like the Epsons survive (even in compact form) is the fact they cool the lamp which these do not. The cheap units survive fine for short sporadic use, not being run for hours at a time.

Now, the bad news: These cannot be repaired economically; you just can't. The cost of parts exceeds the purchase price. The parts cost makes them interesting toys someone like me would buy if I could get the price right or it came with an expensive screen (at retail) I can use on a real projector (and abuse it in places I wouldn't abuse a nice unit like my Epson) well past the death of the crappy projector; otherwise I dodge these turds. The good news is IF YOU GET LUCKY, you can sometimes buy the good units with no real issue besides no testing for next to nothing, sometimes with a very sweet bonus of a low-hour lamp (or at least well under the average for that model). I have just bought the whole projector at that point, especially if it beats out my old one which needs a lamp (I will still buy a new lamp but the price justified the upgrade).

Look for a nice used Epson, BenQ, or Optoma with HDMI; beware of DMD death with used DLP units and be ready to move on; it's not a cheap fix either and I use the Epsons because I'm sensitive to DLP flicker (not present on 3LCD); it just can't be avoided on one-chip DLP; I haven't tried 3-chip DLP against my eyes bc I have no reason to knowing I can just get an Epson and have 3LCD. An office unit with XGA (1024x768) is fine, but many have insane amounts of lamp hours; budget for a lamp in the price you pay looking for NOS Epson) but the newer office units tend to at least be native 720p/1080p capable. HT units were rocking this for a decade early, but many have lamps that were discontinued (sold by Epson) and can only be purchased aftermarket (making sure you buy ones with the Phillips Osram P-VIP lamp from a place like Pureland Supply). If you can find them from a vendor like Pureland go for it, but I would favor a unit with OEM lamps I can still get from Epson as an indicator I can semi-lowball someone looking to get rid of a pile of lamps and take home 2 or more for the price of one from Epson.

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If the Vankyo 7000 is anything like the Vankyo v630w, the lamp cooling fan may need to be replaced to prevent the issue from recurring while replacing the damaged part. The design of the v630w is such that the polarizer is next to the large end of the lamp funnel (looks like a rectangular funnel, not sure what the technical name is) and the polarizer is what takes all of the heat from the lamp. The plastic polarizer film on the glass is what discolors after too much heat builds up. The LCD panel is probably fine.

My v630w, lamp cooling fan started screaming three days ago, so I promptly turned it off and ordered a 92mm ball bearing fan from Amazon. I replaced the fan tonight and it is now running much quieter but I think the fan was probably under-performing for a few months now because i noticed the right side of the screen has been developing a shadow, so I

ordered a replacement polarizer glass from AliExpress tonight.

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I would check the polarizer glass to see if it has been discolored. If it is, order a replacement for your projector model (there's a seller on AliExpress who is selling replacement polarizers for my Vankyo v630w). If you have to replace the polarizer, you probably should consider replacing the lamp cooling fan as well, even if it's not making any loud noise yet (mine had just started screaming). In my case, I believe the fan may have been bad for a few months which led to the shadow forming on my polarizer glass.

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Unfortunately, the dark spot on my Vankyo V630W isn't caused by a burned polarizer glass. I flipped the polarizer over (rotated it in the slot 180 degrees clockwise) and the dark patch which started on the left side of the screen, is still on the left side. I figured after that, that it must be the LED lamp module has bad leds on it, so I just installed a new 4046 LED lamp module (which was a real PITA too). It still has the dark spot. I decided to again rotate the polarizer but again it still on the left side.

I don't think the Fresnel lens is the cause, nor the keystone adjustment (another Fresnel lens that pivots). All I can figure is that the LCD panel is going out or it has its own polarizer film stuck to the panel, that has browned due to excessive heat. The image is still visible even though there's a dark spot over it.

Fortunately, a couple of months ago I bought a used Viewsonic DLP projector for $275 on Amazon, so it's not a big issue. I only use this one to trace sewing patterns now.

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I confirmed the issue on my Vankyo v630 is the LCD panel has a dark zone on the left half of the screen (it looks like the polarizer that is built into the panel might be burned or scorched).

I found a source on Alibaba for a new LCD panel for this projector (M19 is the generic model), and I've purchased one (for $20.00 US and $18.60 delivery and import fees or DDP).

I hope to receive my new panel in 2-3 weeks, probably by the first of August.

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