[Q] hd2 Touch screen not working any more

Same ploblem here, and my solution is on the end call botton, just push a bit hard and moved it around for few seconds and that will make screen respond again , at least is a temp fix untill you change the touch screen ,looks like the problem is on the plug under the end botton , hope this works for you ...

Same here

Efffff My Life......... Errrrrrrrrrrrr i bought this.

Full LCD Display + Touch Screen Digitizer (fit together solderless already) for HTC HD2 HD 2 ii Leo T8585 T-Mobile ~ Replacement Repair Pasts

from Amazon

i'll let u guys know how i did. wish me luck.

lude219 said:

I hear ya...

Both on android SD and NAND, i did feel that the phone runs a bit warmer than on winmo. I'm not an expert in android or anything, but does the 16M color on android has something to do with it? I don't know if it's a graphics driver issue or hardware, but something tells me the HD2's stock capacitive screen couldn't handle that much color cramming down it's pipeline.

Click to expand...

Click to collapse

lude219 said:

I hear ya...

Both on android SD and NAND, i did feel that the phone runs a bit warmer than on winmo. I'm not an expert in android or anything, but does the 16M color on android has something to do with it? I don't know if it's a graphics driver issue or hardware, but something tells me the HD2's stock capacitive screen couldn't handle that much color cramming down it's pipeline.

Click to expand...

Click to collapse

The HD2's screen was designed to handle 16M color...the HD2 was designed under the presumption that it would be upgradable to WP7.

I think what's causing a lot of issues are the hacked drivers (including the graphics drivers) needed to run the Android ports. They don't run as efficiently as the stock drivers, consume more battery, and in turn generate more heat.

I have not used android at all, only WM6.5. But after update got same proble
I think it is a tru age do his job.

well, i will try to sort out some of the "myths" relating the touchscreen

1. touchscreen fails because of color reproduction by the display (16mil color problem etc) FALSE

Yep, the touchscreen is placed just above the display and most people think of it like a part of the display itself. In fact, from the electronics point of view, it has nothing to do with the display. It's not connected electrically to the display, not even to the graphic processing chip. It has nothing to do with them. To try to make an analogy, the touchscreen is to the phone like a mouse or keyboard is to a PC. A peripheral device used for data input. It connects to a different jack on the back of the pc and it's pretty much stand-alone. Of course, if your pc monitor or video card could get busted, you wouldn't blame the mouse. Or if you cannot see the cursor, you couldn't blame the video card. They're just different things. So.. whatever you display on the screen, whatever resolution or colors, be them right or wrong for that specific display.. the touschscreen itself won't have anything to do with it. For it to die in relation to such things.. hmm.. it would be like your mouse to die because you set up a wrong screen resolution or an improper video driver.

2. Touchscreen can die because of android (or other os) or because of improper firmware - FALSE

A capacitive touchscreen is a pretty passive device. It only sends data, never receives them. You cannot set a touchscreen not to work or feed it with wrong data for it to malfunction. Just like a mouse. You can only make it not recognizable by the OS if you mess up with some drivers/settings. But you cannot kill it this way.

3. Capacitive touchscreens are sensible to electrostatic discharges and can be killed by larger ones. - again FALSE (well.. at least in normal conditions)

Most capacitive screens use glass as middle layer for the conductive plates that form the actual touchscreen. Glass is being used because is a stronger electrical insulator then plastics, most polymers etc. It also gives the display underneath it, maximum visibility. However, what you touch on the surface of your phone's screen is not actually glass (be it the gorilla variety or other kinds). The screen is coated with some indium tin oxide that acts like an electric conductor. It will take up small electrostatic charges present in your fingers. These charges will disturb the electromagnetic field created by this conductive layer and the similar one underneath the glass insulator. This disturbance is measured and recorded as a "tap". So yes, the display works by using small electrical currents. Guess that's why i heard the "large-electrostatic-discharges-kills-touchscreen" theory. Technically it's possible. But the electrostatic discharge must hit both conductive sides of the touchscreen in order to pass on to the controller chip. In order to break the atomic bonds of such strong insulators like glass.. you will need an insane amount of voltage AND current. A rough estimate by me (i've worked with experimental high voltage devices) based on the thickness of the glass, let's say about 60-100.000 Volts at a minimum of 100mA. That would easily kill a human, couple of times in a row and still the touchscreen could survive. Trust me, if somewhat that amount of voltage gets on the screen's surface, your phone will be the least of your problems.

4. mechanical shocks kills capacitive touchscreens even if they don't actually break them. Mostly TRUE

Actually, the screen is pretty tough, if it won't break in the initial impact, most probably you won't have problems with it. However the motherboard, connectors and components.. aren't that tough. The most often way for a touchscreen to die is that it's controller chip (the thing that interprets data coming in) breaks, comes loose, has some imperfect contacts etc. The edges of the screen may also contain small ribbon like - cables that can be easily damaged or broken, even if the screen itself looks ok.

5. depolarizing a capacitive touchscreen will kill it - TRUE .. and pretty cool, reminds me of Star Trek

Simply put, a capacitive touchscreen draws some amount of power in order to keep the conductive areas to a certain electrical potential. This is needed for a small electrostatic field to be maintained over the screen surface. When your finger touches the screen, it induces it's own electrostatic charge, and those combined will produce a small spike in that field that the controller circuitry knows to interpret as a "tap" (click, touch .. whatever). If the pathways that lead the current to the screen surface get damaged, the screen won't generate this field so .. simply put, will become non responsive.


No. 5 is my personal guess on the cause of touchscreen failures. I guess that a small conductor strip (reeaaally small wire) drives the current on the upper part of the screen and somehow can be broken and depolarize the upper electrodes and indium tin oxide layer. I don't know it's location and i would require a microscope to examine the screen surface. However, since there's been some talk about the lower part of the screen, the red button area etc, it seems that either the problem is located on the screen level - this strip has been broken and thus, the capacitive matrix was depolarized, or like pvii said, there must be some sort of faulty tracks on the pcb underneath.
I'll be getting another HD2 for testing, i'll try to look into this problem but as I see it, it won't be very do-it-yourself fixable.