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ludi
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Re: Anyone repair anything today?

Tue Dec 18, 2018 8:27 pm

deputy dawg wrote:
Dell Latitude E7440 using our standard Windows 10 image....I eventually came across the solution in this video: https://www.youtube.com/watch?v=00xRSqyGnks (no sound)....Removing a screw underneath the keyboard fixed the problem. As soon as I did that the CPU started performing normally, and the guy who made the video claims he has fixed over 450 of these Latitudes this way with no side effects. I'm sure there is a perfectly logical explanation for this behavior, but who would have ever thought a factory-installed screw could cause such a specific issue?

Someone must have hit the infinite improbability drive, because you have landed in the portion of space where I have an autopsied E7440 carcass in the e-waste bin. Here is the area identified in the video:

Image

My best guess is that Dell designed this unit to a target size and weight and made cost-cutting sacrifices on the physical stress analysis. For example, a lot of these E7440s have a cracked bezel at the top of the keyboard, in-line with a hidden screw mount under the keyboard that indirectly secures the bezel to the bottom pan via the hinge steel. It is near the mounts for the left screen hinge, and the bottom-pan on the left side has less structure than the right due to the cutout for the cooling fan assembly. So the pan overflexes on the left side and the plastic bezel eventually fails at that point.

Here, as you can see from the pictures, the retention spring for the battery clip attaches next to the post supporting the problem screw. There's probably another stress point there and over time it warps the motherboard slightly and causes some kind of fault, which it then relieved when the screw is removed. Top side (under the keyboard shield) has a few SMT devices close by, bottom side (by the post) is fairly clear, no meaningful damage visible. It's not obvious to me what the exact failure mechanism is, but there you go.
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derFunkenstein
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Re: Anyone repair anything today?

Tue Dec 18, 2018 11:12 pm

just brew it! wrote:
ludi wrote:
derFunkenstein wrote:
Repair fail....What am I looking for, if not the valve stem? What could possibly still be dripping? Do these things only go in one way? Do I need to take out the new stem and rotate it 180 degrees? I'm stumped.

Do you have any corrosion or similar debris stuck inside the valve body that is preventing the stem's O-ring from sealing tight?

This seems plausible. Corrosion or mineral deposits sound like likely culprits to me.

OK so Delta faucets have another piece inside the valve body that might need replacement: there's a spring-loaded seat that if it doesn't seal against the metal part of the body, water will leak through. And those ALSO needed replaced. Fortunately I got those with my kit. Unfortunately I didn't know what they were for until tonight so I didn't do it last night. But now it's fixed. No more drip.

This video helped: https://www.youtube.com/watch?v=WgdKVAGZUKg
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ludi
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Re: Anyone repair anything today?

Mon Dec 24, 2018 3:40 am

Another year gone by, and another leaking toilet standpipe. Only wrecked a half-square-yard of interlocking flooring this time and lower access was open studs in the basement, so the repair it went faster than the master bath last year. It was an old 5gpf model I intended to replace soon anyway, in a restroom due for some additional light renovations, but (aaargh) not right before the holidays.

Granted this install probably lasted about 15 years, based on a best estimate of when it was last redone, but anyone who uses an ABS floor collar and secures it to a 3/4" plywood subfloor with exactly two screws deserves to be taken out behind the woodshed and properly switched with a green branch. There's no excuse for such stupid shortcuts. Nothing was obviously loose but the stool bolts weren't as secure as they ought to be and the whole assembly had flexed quite a bit during its abbreviated lifetime.
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derFunkenstein
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Re: Anyone repair anything today?

Tue Jan 08, 2019 9:13 pm

New Year's Eve I got my hands on an NES that was very glitchy for nothing. The guy didn't know what was wrong with it, but he threw it in with some stuff he had on CL that I actually wanted. It wasn't until this past Friday night that I took it apart to see if I could figure out what was wrong. As it turns out, one of the pins on the 72-pin connector got bent out of place and so the tile map was corrupted. You could turn it on and it'd start out OK but it got progressively worse over a few seconds and within 10 seconds it was totally hosed.

But that's an easy fix, a new 72-pin cartridge connector is $10. And then since this is a spare NES for me, I tried the expansion audio resistor mod. This article shows it very clearly, and it recommends a resistor in the 16k to 47k range. A post on the Everdrive forums used a three-way switch with two 47k resistors where you could add 47k or 94k of resistance.

I got the Weller soldering station y'all recommended to me, some 60/40 solder, and a kit full of resistors. Since I'm using an Everdrive N8 but the cart now has volume controls, I just put a plain old 47k resistor in it (and if a chip is too loud, I'll turn it down in firmware). You would not really want to do this with real Famicom carts, because carts with expansion audio chips have instructions on how to mix the audio with main system audio in order to keep volume levels even. With this mod, you lose that capability. So you should only do this if you're using a flash cart. Otherwise, use a 100k potentiometer and install it on the front of the machine so you can mix audio manually. It just varies from cart to cart.

Anyway, I'm thrilled. Baby's first hardware mod. Here's a pic: https://twitter.com/TVsBen/status/1082817194742960130
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liquidsquid
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Re: Anyone repair anything today?

Wed Jan 09, 2019 9:18 am

ludi wrote:
Another year gone by, and another leaking toilet standpipe.


A long time ago, while my wife and I were living in an apartment, a housing development was being built nearby. These were $300K+ houses (~1999) being touted as luxury homes. We took walks around there as we were interested in living there if we could pull off the price (we couldn't). I didn't feel so bad after I saw the homes being built.

Tile in showers directly on basic waterproof plasterboard, which is only waterproof on the surface layer. Tile directly on plywood floors. Standpipes directly on plywood. Roofs a bare minimum of strength with long beams over the garage that were sagging before the roofing was even added. Basements that literally had water squirting up out of the floor, even when it wasn't raining. The worst part was is this was salt water as there is a salt deposit only a few hundred feet below the surface there. Crap windows.

So we went looking for something with a little better foundation to it than to be stuck with a new overpriced house with a short lifespan. We wound up dealing with a huge bunch of different issues instead. Still, at least we have land instead of a postage stamp.
 
Chuckaluphagus
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Re: Anyone repair anything today?

Wed Jan 09, 2019 10:05 am

liquidsquid wrote:
A long time ago, while my wife and I were living in an apartment, a housing development was being built nearby. These were $300K+ houses (~1999) being touted as luxury homes. We took walks around there as we were interested in living there if we could pull off the price (we couldn't). I didn't feel so bad after I saw the homes being built.

Tile in showers directly on basic waterproof plasterboard, which is only waterproof on the surface layer. Tile directly on plywood floors. Standpipes directly on plywood. Roofs a bare minimum of strength with long beams over the garage that were sagging before the roofing was even added. Basements that literally had water squirting up out of the floor, even when it wasn't raining. The worst part was is this was salt water as there is a salt deposit only a few hundred feet below the surface there. Crap windows.

If you're not familiar with McMansion Hell, it's an entertaining blog by an architect cataloging the horrors of exactly the type of construction you're describing: build it big, build it flashy, build it cheap and build it wrong. She also writes a lot about architectural styles and practices, it's worth a read if you're interested.
 
just brew it!
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Re: Anyone repair anything today?

Wed Jan 09, 2019 10:45 am

Chuckaluphagus wrote:
liquidsquid wrote:
A long time ago, while my wife and I were living in an apartment, a housing development was being built nearby. These were $300K+ houses (~1999) being touted as luxury homes. We took walks around there as we were interested in living there if we could pull off the price (we couldn't). I didn't feel so bad after I saw the homes being built.

Tile in showers directly on basic waterproof plasterboard, which is only waterproof on the surface layer. Tile directly on plywood floors. Standpipes directly on plywood. Roofs a bare minimum of strength with long beams over the garage that were sagging before the roofing was even added. Basements that literally had water squirting up out of the floor, even when it wasn't raining. The worst part was is this was salt water as there is a salt deposit only a few hundred feet below the surface there. Crap windows.

If you're not familiar with McMansion Hell, it's an entertaining blog by an architect cataloging the horrors of exactly the type of construction you're describing: build it big, build it flashy, build it cheap and build it wrong. She also writes a lot about architectural styles and practices, it's worth a read if you're interested.

Our house isn't big or flashy, and has most of those issues! :roll:

I can also add: Bathroom light fixtures screwed into the drywall with no electrical box or conduit (electrical connection was to a couple of wires dangling out of the end of a loose run of armored cable). The fixture was also hiding a rather large, ragged hole in the drywall which looked like it had been made with a hammer.
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derFunkenstein
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Re: Anyone repair anything today?

Wed Jan 09, 2019 10:58 am

just brew it! wrote:
The fixture was also hiding a rather large, ragged hole in the drywall which looked like it had been made with a hammer.

When the light fixture is only 3 feet off the floor, you can guarantee it was an accidental hole. :lol:
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Chuckaluphagus
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Re: Anyone repair anything today?

Wed Jan 09, 2019 11:42 am

derFunkenstein wrote:
just brew it! wrote:
The fixture was also hiding a rather large, ragged hole in the drywall which looked like it had been made with a hammer.

When the light fixture is only 3 feet off the floor, you can guarantee it was an accidental hole. :lol:

When I was a kid, I put my foot through the wall of the living room, about 2 feet off the floor. My father's solution was to hang a large framed print that covered the hole for the next 25 years. :D
 
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Re: Anyone repair anything today?

Wed Jan 09, 2019 12:13 pm

Chuckaluphagus wrote:
When I was a kid, I put my foot through the wall of the living room, about 2 feet off the floor. My father's solution was to hang a large framed print that covered the hole for the next 25 years. :D

My parents did something similar...when I was a kid, my sister spilled some red Kool-Aid on carpet that was maybe six weeks old. That night, we rearranged the living room and a chair went there, and it sat there for around 12-13 years. Fortunately it wasn't in the middle of the room. :lol:

bonus: the padding was still red when we pulled up the carpet.
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Usacomp2k3
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Re: Anyone repair anything today?

Wed Jan 09, 2019 12:26 pm

We’ve got a painting in the bathroom where an inwall medicine cabinwt used it be.
 
ludi
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Re: Anyone repair anything today?

Wed Jan 09, 2019 4:07 pm

liquidsquid wrote:
Standpipes directly on plywood.

Nice to see them at floor level on new construction, although not always an option for existing rework. I've been using this to bridge the gap. In any case, I figure the minimum repair anyone should do is a brass or stainless steel repair ring and a minimum of four stainless screws into the subfloor. When I have access below, I use bolts with stainless threaded hardware and locknuts.
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liquidsquid
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Re: Anyone repair anything today?

Thu Jan 10, 2019 12:29 pm

ludi wrote:
liquidsquid wrote:
Standpipes directly on plywood.

Nice to see them at floor level on new construction, although not always an option for existing rework. I've been using this to bridge the gap. In any case, I figure the minimum repair anyone should do is a brass or stainless steel repair ring and a minimum of four stainless screws into the subfloor. When I have access below, I use bolts with stainless threaded hardware and locknuts.


I don't remember what I used for bridging the gaps, but I have marble landings for all the **** now, and the little trough around the rim of the landing prevents a lot of mess on the floor from kids who are completely unable to aim or lift a lid. The threat of imminent doom and dismemberment is not enough.
The rest of the floor is tile with cement backerboard. In fact at this point, if anything leaks, it will be contained within the room up to at least 1/2 inch deep. I didn't want to install a floor drain as that as too much work. But one of the first things I had to do in my house was rip out a ceiling below the upstairs bathroom and replace all of the joists and the plumbing around the toilet. Never. Again. I hate working over my head.
 
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Re: Anyone repair anything today?

Fri Jan 11, 2019 11:59 am

Debating tearing out the downstairs tub and replacing with a utility sink/shelf space.
Problem is that its all tiled so I would have to end up tearing out the entire bathroom and redoing the floor and all the drywall :(
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derFunkenstein
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Re: Anyone repair anything today?

Mon Jan 14, 2019 4:41 pm

More simple console mods, fixing what Nintendo and Sega should have all along. This time it's the PSG channels in a VA2.x Genesis model 2. The two square wave channels were attenuated more than they should have been, making Master System and some Genesis games sound weird. In Streets of Rage 2, the second part of the first level had no melody line, and that's been fixed. Popped a surface-mounted resistor and bridged the point with solder, and now it sounds just about perfect.

https://twitter.com/TVsBen/status/1084865528718680065
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