Revive a GRiD 2270

[panips]

Got a GRiD 2270 from eBay in rough condition and spent weeks to fix it...


1. Power Supply (AC-DC Adapter)
Easy, let's 3d print one. There is a 10k resistor between the positive pin and center pin.
Input could be 8.5v to 12.5v, so a usb-c pd trigger with 12v works perfectly. And if your pd does not support 12v, it will deliver 9v instead which still works. But there is annoying beeping of low battery which must be turned off in the setup utility.


for copper foil:
https://www.tinkercad.com/things/9mo6qG ... 7K6yDHYtrs
for spring:
https://www.tinkercad.com/things/5RVSc6 ... 5HBGALdGl4

2. mobo issue
Powered on once but failed after about 2 mins. Spent about one week checking the problem but still cannot figure out the root cause. The only finding is that IDE got 3.3v instead of 5v, so either another 5v is connected or short N mosfet (red circled, drain and source) to force a permanent 5v for IDE (no sleeping and power saving support any more) It worked then, but not a fully repair.


3. cmos battery
Used a coin battery holder and a 3v. It's not rechargeable.

4. stylus holder



if the original screw is still here, use the blue one
https://www.tinkercad.com/things/dei2ok ... pZRSIPBjWs
otherwise try the orange one.

5. keyboard


W, T, Y, I, O, G does not work while FN key works, apparently it's the common line issue. Silver conductive paint could fix it, but you must be very careful.

6. hinge and swing arm

Nearly 100% of GRiD 2260/2270 units have broken swing arms. But You can 3D print a Hinge Patch or a full replacement arm.
https://www.tinkercad.com/things/bLc140 ... gcCcceoD8U

You can either 3d print the orange one as a temp fix, or the blue one for full replacement. If doing a full replacement, carefully punch out the pivot pin. Red one allows you to replace the upper pin with a standard screw for easier maintenance.


7. FDD
Ooops, it's totally broken but you can 3d print the belt using flexible resin...I just skipped it for the PCMCIA works fine.

8. LCD & Vinegar Syndrome
vinegar syndrome is common and not hard to fix. It is a Sharp LM64P806, which is swappable with LM64P831, LM64P873 and LM64P805.

The Result: After all that work, it's fully functional again.