how big a piece of copper or aluminium am i going to need to prevent overheat issues, those pics show that there is not much space for fitting a heatsink inside.

edit: i just remembered that i can easily get copper or aluminium fins off an old cpu heatsink i have so that means i got plenty of parts available.

actually i think i can understand why the cpu is overheating its the rf shield covering it. it makes the cpu behave as if its in an oven, localised temps inside the rf shield will become much higher over time inside the phone. a simpler mod can be done here to deal with the issue, but i will have to wait till i get a hold of a hd2 to start experimenting with it.

the "heatsink" mood is useful to prevent cpu soldering failure, not to fix it once it occurs. I usually make such a mood after i reheat the cpu and test the phone.
At first i was thinking it's a simple high temperature problem (ex. cpu must not exceed 50 degrees celsius) so i made the heatsink mood. It ameliorated the problem but did not effectively solve it. Later on, i've reheated the phone, only this had effectively fixed the problem. I left the heatsink on the cpu because i was concerned that without any means to dissipate heat the cpu soldering can fail again after some time. The role of the heatsink is NOT TO LOWER THE CPU TEMPERATURE, BUT TO SPREAD IT OVER A GREATER AREA. The cpu fails because it is very hot, the surrounding pcb near it is rather cool, the soldering thus expands at a greater rate then that of the surrounding materials. The 50 or so, degrees celsius that this chip can output ar not the real problem (it can work just fine even at 70-80 degrees - according to datasheets). The soldering and the pcb design are more of a trouble here.

yes if i do the mod its going to be done on a new hd2 which has not had any previous overheat issues. so the mod should hopefully keep it safe for long time.

yep, i wont solve the current problem, well it can prevent one in future. the rf sheild cant be removed that simply, since removing it can cause interference and can cause problems with cpu.
well i recomend to remove the thermal foil (that one which is used by htc over the cpu compartment), and replace it with a copper heatsink. or remove every thing over the cpu, glue in a heatsink directly over cpu( can use any size, that fits inside the shell). done.

well i never had a thermal problem untill now, coz i take too much caution about keeping my phone cool. so i never opened it. well now i am planning to open it cox i want to solve that "heat issue" and "charging stop" problem by heat sinking the power control chip. ( i want to check it, if it helps).

so my doubt is how u guys opens the device?? is it that air plunger method u use to pull out the screen or smthing else?

Sent from my HTC HD2 using xda premium

My htc desire has a somewhat different problem.. It reboots after switching on mobile data(not wifi). Can a similar solution help in a HTC DESIRE? ?

Originally Posted by gpkumaran

My htc desire has a somewhat different problem.. It reboots after switching on mobile data(not wifi). Can a similar solution help in a HTC DESIRE? ?

it,seemz more lik a software problem. try another kernal,rom and radio

Sent from my HTC HD2 using xda premium

Originally Posted by showlyshah

it,seemz more lik a software problem. try another kernal,rom and radio

Sent from my HTC HD2 using xda premium

no brother... It's definitely due to overheating(although it doesn't get too much hot)..
From what i've found out,

1.It is reduced with using HAVS kernel with undervolting(while using svs kernel, it just reboots but while using havs kernel it just hangs up requiring a battery pull)..

2.And it's reduced with underclocking.. But not completely solved by either of these..
One thing which is different from the problems mentioned by other users is that it gets a lot more time to reboot while browsing through wifi(with 2g/3g data off) but reboots almost immediately with Data on.. Pls help bro..

Hi,

As I have the same problem with my HD2, I just would like if the use of a soldering flux and a Heat Gun could be a good way to enhance the soldering state of the CPU. Because, the CPU overheating could be a soldering problem. So,may be, if we are able to enhance the solder of the chipset, maybe it could be possible to enhance the conductivity between the pcb and the CPU ...

A friend of mine use this method on a Game console and the result was really impressive ...
So, Add soldering flux on the pcb and CPU pins and overheating the pcb with the Heat Gun to activate the soldering flux between the solders and the pins ...
May be a way, but I don't know how to disassemble the HD2

If someone try this method, please post a feedback
....

Nope, will not work, It is a surface mount chip.

Sent from my NexusHD2 using XDA

hd2

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Is there a video of this?