Recent Topics
super tech oil filter good for 5,000mi intervals?
by TexasTea
5 minutes 8 seconds ago
Pennzoil Platinum Meijer $9.99 w/ Mperks
by Spartanfool
38 minutes 38 seconds ago
Need Brighter Headlights in 2002 4Runner
by Gebo
59 minutes 57 seconds ago
Hybrid MPG Calculation?
by AirgunSavant
Today at 11:05 AM
Vredestein tire rebate 10/1-12/31
by slacktide_bitog
Today at 09:54 AM
Deepwater Horizon Movie
by 2015_PSD
Today at 09:39 AM
Dash swap: Cavalier
by supton
Today at 09:37 AM
Quality in re-manned parts between parts stores
by dlundblad
Today at 06:45 AM
Found a use for the Lubegard Biotech/0w20 Edge
by Marco620
Yesterday at 11:59 PM
Whats in your oil stash?
by Farmer
Yesterday at 10:55 PM
350z Junker
by FranklinJL
Yesterday at 10:53 PM
Oil for high-miles 2009 Hyundai Accent?
by cbuck
Yesterday at 08:53 PM
Newest Members
Gunnman, jtoz, Jeff_Ferg, Kaiser, DanielStone
59229 Registered Users
Who's Online
63 registered (2002 Maxima SE, 4WD, 01rangerxl, 901Memphis, Al, 5 invisible), 1940 Guests and 14 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
59229 Members
66 Forums
255128 Topics
4191483 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2167381 - 02/10/11 03:27 PM Took Apart Digital Tire Pressure Gauge - Fail!
George7941 Online   content


Registered: 05/10/05
Posts: 1814
Loc: Toronto, Canada
So, my Accutire gauge, after nine years, displays L. It came with a ten year warranty, including the battery. I e-mailed Accutire about getting the battery replaced but they did not reply.

I took the gauge apart to replace the CR2032 battery. Here are some pictures










I put it all back together but now it will only display 01.0, no matter what the pressure is. It looks like I will be buying another gauge.

They have a weird way of mounting and connecting the LED display. The black strip, just above the display, in the first picture, is the contact strip that connects the display to the circuit board. What is strange is that I see no corresponding contacts on the back of the display. In the third picture, you can see the row of contacts on which this strip sits. Anyone know how this works?
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#2167491 - 02/10/11 05:16 PM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
Been there done that but not on a tire gauge.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

Top
#2167522 - 02/10/11 05:56 PM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
Eddie Offline


Registered: 12/07/03
Posts: 8328
Loc: Florida, Cape Coral
Did you ground yourself before taking it apart? Static shock with ruin the components on the board.
_________________________
CX5 Touring 2.5L :-)

Top
#2167612 - 02/10/11 07:50 PM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
Vizzy Offline


Registered: 04/26/09
Posts: 1183
Loc: Canada
Originally Posted By: George7941
So, my Accutire gauge, after nine years, displays L. It came with a ten year warranty, including the battery. I e-mailed Accutire about getting the battery replaced but they did not reply.

?


Why didn't you call them or e mail again?

I would have. If it has a 10 yr warranty you should have made them honor it.


Go ahead and put the thing back together with the old battery in it as well. Contact them again and send the old one back to them.

Top
#2167655 - 02/10/11 08:47 PM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: Vizzy]
George7941 Online   content


Registered: 05/10/05
Posts: 1814
Loc: Toronto, Canada
I did not ground myself, so it is possible that some static damaged some component. I will be more careful next time.

It is going to be a hassle getting them to change the battery since they have changed the battery warranty on their current products. I have the original package on which it explicitly states that the battery has a lifetime warranty


Since I paid less than ten dollars for it and shipping it to them from Canada will cost me a few dollars, I am not going to go thru the trouble of getting them to honor the warranty.

I am still curious as to how the strip makes contact with the display module.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#2167832 - 02/11/11 04:13 AM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
Rick in PA Online   content


Registered: 01/04/03
Posts: 2875
Loc: Southeastern, PA
Not sure if the contact strip is like this, but it's one interesting low cost type that I have encountered. They take very thin alternating layers of conductive and non-conductive rubber and bond them together in a many, many layer sandwich. Then they dice the sandwich across the layers to make a strip that has a large number of conductors perpendicular to the strip. The layers have to be smaller than the contact pitch on the circuit board. Then they just lay the strip across the contacts on one circuit board and press the contacts of the second circuit board to the rubber sandwich. The edgewise conductive rubber layers make contact between the circuit boards. It's a low cost method of connecting circuit boards for low power applications such as driving an LCD.
_________________________
A wise man told me:
"Heat is your friend." and "Any oil is better than no oil."

Top
#2167935 - 02/11/11 08:11 AM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
George7941 Online   content


Registered: 05/10/05
Posts: 1814
Loc: Toronto, Canada
That is it! The strip is made of many (maybe 50) layers of rubber.

What is still puzzling is that there are no visible contacts on the LCD module.



The white rectangle is the back of the LCD and it is recessed inside the clear rigid plastic frame. The strip is mounted on the one of the long edges of the rectangle and I don't see what it is making contact with.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#2168098 - 02/11/11 11:12 AM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
ARB1977 Offline


Registered: 06/12/05
Posts: 4781
Loc: North Texas
Ten years for ten dollar gauge...not bad. Just go get another one.
_________________________
2015 Tacoma 4.0L 30K (as of 5-24-16)
Mobil One EP 5W30 / Toyota filter

2008 CRV 2.4L 151K (as of 08-13-16)
Maxlife 5W20 / Fram TG filter

Top
#2168656 - 02/11/11 09:47 PM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
wapacz Offline


Registered: 11/21/05
Posts: 935
Loc: MI
When you get L it mean the internal battery is dead from my understanding. The way I figure it is that the internal battery keeps some form of calibration for the sensor. When it dies the calibration is lost and it only displays 1.

Top
#2168813 - 02/12/11 04:31 AM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: George7941]
Rick in PA Online   content


Registered: 01/04/03
Posts: 2875
Loc: Southeastern, PA
Originally Posted By: George7941
That is it! The strip is made of many (maybe 50) layers of rubber.

What is still puzzling is that there are no visible contacts on the LCD module.



The white rectangle is the back of the LCD and it is recessed inside the clear rigid plastic frame. The strip is mounted on the one of the long edges of the rectangle and I don't see what it is making contact with.


Not sure what they're using for contacts, but I have a guess. They may have to route the electrical charges over the clear LCD display, so they might be using something that's clear and conductive. Years ago, I came across tin-oxide coated glass. It was clear (maybe a bit of tint) but the surface was very conductive. You could measure the surface resistance with a standard multi-meter. It was an interesting material. I'll bet there's contacts there, they're just not visible.
_________________________
A wise man told me:
"Heat is your friend." and "Any oil is better than no oil."

Top
#2169944 - 02/13/11 11:43 AM Re: Took Apart Digital Tire Pressure Gauge - Fail! [Re: Rick in PA]
George7941 Online   content


Registered: 05/10/05
Posts: 1814
Loc: Toronto, Canada
Right again! I took a close look at the LCD module and if you look directly at the transparent edge of the module, nothing is visible but, if you look at the edge at a very shallow angle, the strips become visible. They match (spacing and width) the contacts on the printed circuit board.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top