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Terrible noise (fan). How to open and fix device?

Hi there,

I bought a “Cleargrass” air quality tester from China:

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Great device (while it worked), great build quality. See https://qingping.co/air-monitor/overview (Google translate helps with the Chinese) for more details.

A few days ago, it started to make terrible noise:

I guess it’s an internal fan. The device has a particulate matter air quality sensor. The way it works is: sucks in air and counts particles via laser reflection. So it definitely has a fan that’s also visible here in the explosion chart and video:

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The device looks really solid and has no visible screws.

Two questions:

  1. Any idea how I might be able to open it?

Is it glued together? Would that mean: put a hair dryer at the back of the device and try to pull off the lid on the back (see explosion chart)

  1. If I can open it, do I have a chance to fix the fan, as it seems to be a whole sensor module from the explosion chart.

Would appreciate any help. It’s a great device but the noise is terrible. Would be a shame if I had to throw it away.

Thanks,

Holger

No idea how to open it, I don’t even see a way to open it:

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(And FYI: I sent the Chinese manufacturer an email, but no answer)

—-

Update: removed back lid:

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Respondido! Ver a resposta Também tenho esse problema

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Thanks, the back was clipped in indeed. But removing the back lid kind of lead to a dead end: (see last picture in the original post)

So I'm afraid I need to open the device from the front.

My best guess would be that the glass LCD is glued on and I need to remove it - but then again I have hardly any experience with repairing modern electronic devices.

Any educated guess from you guys?

Would that mean as next steps:

- heat up LCD

- pry off screen / try to pull off heated LCD with a suction handle ?

por

Hi,

Did you look under the "feet" shown in the 2nd last image above to check if there are any screws there holding it together?

Looking at the image of the exploded view of the product (3rd image down), when you look at it closely there appears to be 2 "threaded" type tubes?? shown on the bottom casing (for screws maybe?), that may line up with the feet position.

Worth a look anyway

por

I have the same problem. How you managed to open it? From the back?

por

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Hello. Yesterday i tried to open it. Fan noise is horrible.

But no luck.

Update (03/22/2020)

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Screews free feet

Update (03/22/2020)

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here was glue

Update (06/07/2020)

bolts are there

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Update (03/22/2020)

Just use car engine oil for fan. And noise should be gone.

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Did you manage to repair it?

por

Hi i have the same problem, did you manage to solve it?

por

How to disconnect the cables from the display, button, etc?

por

It is standard cable connectors. Need to remove the button assembly.

por

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please help to find compatible spare fan for this device.

i’ve disassebled and assembled it, added silicon get as lub but fan does not spin - so device shows low values of pm2.5 - all other seems ok.

now will try to attach photos wich shows how to make aluminium case removal easer.

you just need to make few mm notch to take it back, not front

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I have ordered this one. It works nicely for the replacement :) https://www.aliexpress.com/item/40010517...

por

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It's probably a screwless case, this is preferable in assembly for cost and ease of assembly. Looking at the pictures I would take a best guess on where to try a prying tool. Probe around any seams you find and gently lift them. They should release if it's a snap together case. Start with the back.

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Still no luck, I can’t figure out how to remove the front without breaking it.

I did apply an iOpener - but still couldn’t open it.

Something weird happened, though - the noise was gone after I applied heat from the iOpener. It lasted for a few days, but now the noise is back.

Anyone know why the heat helped? Any more ideas on how to remove the front?

por

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I have fixed mine by removing back lid , then with syringe and needle ive dripped small amount of oil for sewing machines directly to the center of the fan. With no need to disassemble the whole unit.

Update (10/26/2020)

@papikus U can use butter knife or something similar , and press it from the corners between monitor's body and plastic backplate (lid) where charging port is, then slowly wiggle it to separate off back plate from rest of the body. Backplate has 4 hooks in corners that holds it to the body so do it slowly not to crack them.

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https://freeimage.host/i/fE5Nvj

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How to disassemble the device?

por

I tried it but it did not solve the problem.

https://freeimage.host/i/B3dMog

No effect at all!

por

I have checked your picture. You have placed it on display, that way psb is in vertical position and oil will just pass by the fan and go to internals.

You need to hold it on its feets (like it usually standsl and and oil it that way as it will fill fan base and oil it. It better to use @ilgiz post to disassemble device and that way you will have direct acces to only fan and it will be easier to oil it up OR to replace the fan.

por

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I opened from the back side.

  1. Remove the back plate
  2. Make two holes in order to remove stoppers (Check ilgiz 's post)
  3. Push from the back and remove the metal cover
  4. Remove screws using screwdriver

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Thanks for your answer.

1. Done.

2. I need to make a 2 holes in those 2 spots? You mean in the plastic cover? Why? Is not a problem?

por

Yes, if you want to open from the back side (which is much easier than the front side).

The spots where marked with red arrows in his picture work as stoppers which anchors the inner plastic case with the outer metal case.

> Is not a problem?

I think that's not a problem. The inner case and outer case are still be tied with their friction force and the back panel also helps.

por

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I made 2 holes in the spot from the image above but no sign to get it out. You can see the holes in the image attached. Any ideas why it does not pull out?

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Maybe... too shallow and a bit small? Can you see any metal inside the holes?

FYI: I have updated my post and attached a photo, so that also may help.

por

I made this mess and still cannot open it. :( [image|2480219]

por

Mada, try to PUSH it from back to front - it will come out from the front. I made the same mistake, was trying to pull black plastic back.

por

Got it, thank you very much for this information. But now I have another problem, somehow I did touched something inside because I don't get any information about temperature and humidity. Do you know what can it be?

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I made this mess and still cannot open it. :(

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Holger Mayer será eternamente grato(a).
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