yashsingh1/xdaforums huggingface dataset:
[HD2 General] ictimai:
Hi, my HD2 Leo seems to have the issue of freezing after 15 minut of surfing Internet via GSM. Since the issue started to occur in these hot weather days it should concern the topic of this thread.

How to conduct safely this reflow baking?

What connectors should be detached from the mainboard before placing it into an oven - could you provide detailed photo instructions?

On what side the mainboard should be lain - I suspect if turned upside-down then solder could flow out from already good connections, couldn't it?

WHEN should the mainboard be shuffled into an oven - onlly AFTER the required temperature is reached OR it should be heated slowly from the beginning and remain untuched into an oven from the very beginning (until the very end, i.e. until an oven cools down naturally)?

The question seems well founded since I would worry about sudden tmeperature changes, this produces strains which could result as mechanically damaging...

So please, provide more detailed information how to conduct this extremely risky and delicate experiment... ;)
[HD2 General] ialial:
Wow, is this problem common with all the latest products with Snapdragon chipset? In fact almost all smartphones are on Snapdragon, not only by HTC but also by SonyEricsson and Samsung. If not then speciffically which models are OK in this respect?

And which manufactures are the most trustable?

The latter question seems the more valid the more the problems seem made in purpose: just to make users switch to new devices more frequently generating such an artificial increase in demand. So, the greed, not just neglect! And also the matter of trust in particular brands...
[HD2 General] psytr0nic:
theoretically usful ... in pratice it seem only motoi_bogdan could solve his phone ..

none yet , I tried one but result 0% so sir let us know if another way is discovered to break snapdragon fire ?
[HD2 General] ictimai:
However which way have you tried: all MB put into oven or just hot air selectively on the chip (while remaining part of MB secured whith alluminium foil)?

If the latter then have you controlled temperature & time while heating?

Just asking as my local gsm service declared could do this without any problem (with hot air gun and controlling temperature & time) but also of course without any guarantee it could help. Is it worth trying?
[HD2 General] psytr0nic:
.

Maximum time is power on and just remove battery and replace to try power up , it hang on boot screen .

maximum time when phone on is 5 minutes phone commence heat .. tried alluminium foil . not tried hot air .
[HD2 General] motoi_bogdan:
it's a tricky job to do.

If you study the soldering process and the problem itself, the method should have a 100% success rate. However in reality, BGA soldering IS NOT DONE with gas/electric ovens, heat guns and crappy china made hot air solder stations. There is a HUGE difference between that and the industrial soldering stations used on manufacturers assembly lines. So, user experience, know-how, patience (etc), is required to compensate crappy tools. After some years soldering stuff i can almost smell a good solder joint and i simply know when to stop. Even so I managed to kill one phone because, as i've realized later, not all hd2 are soldered in the same way, some require lower/higher temperatures when resoldering etc.

If i look over the topic, there were 2 guys that have some success with this. One used an infrared smd rework station (~$1000 piece of kit) and manage to fix one phone after some attempts but with some other damage in the process and another one manage to fix a bunch of phones using some sort of contraption involving a pancake oven/plate. On another topic, i've told one other guy about this method and he quickly managed to revive his phone using it - it turned out the guy had experience with reflow/reball operations and did his share of such stuff over the years.

On the other hand, there were some guys trying to fix phones using heat guns, gas lighters, ovens and such stuff but most failed in the process (ranging from failure to epic failure).

Reheating is the only option known to work (heatsinks are applied to WORKING phones to PREVENT this problem, not to fix it) but i guess it should be done in a service center. Even there, they can't give you 100% chance it will work.
[HD2 General] showlyshah:
As far as i know, my hd2 getz fire on 3g and feels like in hotplate while uzing 2g data. No other thingz heatup my phone. I use it underclocked at 8xx mhz.

But the thing is i need to buy an htc phone(or may be galaxy nexus), and i want a decent 3g perfomer with out a lot of heat. I have a transformer prime with tegra3. It gives out lot of heat while playing games or so..( hd2 produce much less when compared to it for same task). So my question is that is there any htc phone (android) which is less "hot"? Any suggestions? I am not going for onex any way. What about evo3d/sensation? And if i cant get one from htc i will go for nexus series. I need a phone with good perfomance. And less heat issue. Do all qualacom chips heat up like hell?? Pls give suggestions.

HD2 HYPERDROID EXTREME EDITION V6.0.1 @ FIKERT KERNAL.
[HD2 General] motoi_bogdan:
all chips give up roughly the same amount of heat. Qualcomm is similar with exynos or tegra chips. Their thermal design is about the same. However, the actual feel that the phone is hotter or colder is related to a different aspect. Knowing the chips generate some amount of heat, manufacturers can chose to eiher dissipate this heat over the surface of the phone by using a metal plate in direct contact to the cpu's casing, or to try to keep the phone cool by placing a thermal insulator between the casing and the cpu area. The first method is more effective from the cpu's point of view and overall lifespan of the entire device, however it's also uncomfortable for the user since the whole phone would heat up. The second method will keep the phone colder, but overall board and cpu temperature will be higher since the heat doesn't have a way to get out and thus remains stuck between the thermal insulator layers.

An example of method 2 is the first revisions of the apple macbook air. While the laptop did had an aluminum casing and one would expect that it would help keep the cpu cool, in fact the cpu area is thermally insulated from the metallic chasis. Because of this the cpu could easily go up to 90-95 degrees celsius in full load. So I thought to remove that thermal insulator and make a bridge from the cpu metallic heatsink to the aluminum chasis. Once done, the cpu's max temperature dropped to about 70 degrees but temperature at the bottom of the case simply DOUBLED. It was hot as hell. So of course, from the cpu's point of view, 70 is more ok then 90 degrees, but the user experience was pretty bad since the laptop was uncomfortable to use. Apple thought that user experience must be 1st, hardware safety being 2nd. However the first revision of MBA was plagued with cpu overheating problems, because of apple decision. Only 2 generations later this problem was solved by redesigning the cooling system and motherboard.

HD2 was a similar case, the cooling system does not exist, the cpu is mechanically separated from other metallic components. Thus it overheats. If i remember right, hd2 was one of the first phones made by htc that incorporated a snapdragon chip. Well, first time was no luck, they got it wrong :)

I didn't solve your problem here, i didn't recommend a phone that doesn't heat up, instead i just pointed out that a phone heating up is not always a bad sign.
[HD2 General] Dad57:
I do the job as told in the topic, but with no result.

Video stress test ok but angry birds heat the phone up to 40°C and froze it.

Don't know if going back to WinMo will solve the problem
[HD2 General] archidune:
Oven soldering to come

Hello,

I'm about to buy an HD2 which obviously has overheating issues (blank screen, freezes, bat. removal).

The guy is on vacation right now, but will return on sunday (GMT +2 in France).

Hopefully the phone has not been sold yet.

I've read the entire thread: whatever may happen to the phone (dead or alive), you all did an amazing job, especially motoi_bogdan of course.

I'll give some news asap.

I came across some other interesting stuff about "home cooking":

http://www.computerrepairtips.net/how-to-reflow-a-laptop-motherboard/

archi
[HD2 General] psytr0nic:
no bad the link you shared .
[HD2 General] Slampisko:
Very cool thread (pun intended), thanks to everyone who contributed. I have an HD2 which was left with a broken touchscreen for about a year and now that I finally got it fixed, I got the overheating problem.

So anyway I'll try the oven trick soon as I have a chance and if it doesn't work, I guess I'll just have the motherboard replaced.

Good luck to everyone with reheating!
[HD2 General] EricTheViking:
Going to try an IRDA station on mine...

Dug my HD2 out the other day to use while my Lumia is at the menders, then remembered that before I retired the HD2 it had become almost unusable due to the overheating / 7 vibrations reboot problem.

Tried to power up the phone but it would only stay powered for a few seconds. Eventually I managed to get it to stay on for long enough to disable HTC Sense, and also lowered the back light level which allows it to stay on to receive emails and texts.

Anway, am getting an IRDA reballing station in the next few days and am going to try a reflow on the HD2 using the reflow station.

Thanks to all that have posted valuable information here, will let you know how I get on either way :good:
[HD2 General] mootmetal:
it would be great to find out a solution ...my hd2 had overheating problemes ..it causes battery drain: 60ma at standby and other weird problemes for example if i need to reboot i had to wait 2-3 mn after shut down otherwise it stuck on the second boot screen ...and i need to wait the same periode to access recovery or bootloader i tried everything .. in the end i said it harware related ...than i gave it to my wife and after a month or more unused all problemes desapeared ... and i have 7ma at standby ...i still have overheating ...but less than before.

i guess they have to make a phone with a fan inside :D
[HD2 General] EricTheViking:
Nope, threw a seven that time ;-(

Tried reflowing my HD2 processor on an IR rework station, but got the heat too high and popped the chip.

C'est la vie. Had nothing to lose as the phone was pretty useless as it was.

If anyone is interested I was using a T862 rework station, bottom plate pre-heat 180 degrees C for 5 mins. Lamp at 20mm above chip 215 degrees C for 6 pulses. Chip popped during 6th pulse.

Reckon it would have worked better to use 200 degrees C for the lamp and have the lamp at more like 50mm above the chip.
[HD2 General] psytr0nic:
before Reheat did you try the first method too ? avec Papiers aliminuim la ?

sa ta coûté combien cher Eric ton Matos ? la tu payer ou aussi !! grave si c'est en FRance .
[HD2 General] EricTheViking:
No, I didn't want to try the other methods as the IR rework station will give more controlled heat.

I've reflowed motherboard Gfx chips and north/south bridges with success, I just didn't realise how sensitive the smaller Snapdragon chips are to the heat. :)
[HD2 General] archidune:
R.I.P. (biscuit)

Bought it, cooked it once with no result (bootloop). So I put it into the oven for another round: dead. No reaction. Blank. Dark. Gone.

RIP.

Feel free to ask what to do and not what to do based on my late experience.

At least I tried and saw how marvelous phone from the inside ;)
[HD2 General] Igoritza:
Wow, where is OP's account number, to buy him some stuff .. ? :D

My HTC desire (Bravo) is really messed up! As it turns out - NO ONE before me had ever opened the phone, since bouhgt. and what do I find inside - no heat spreader ... ? a Pun is in place: Bravo HTC!

straight out from factory - without those 2, aluminum plate, and copper plate

My question is, since phone is new and unused, would this be OK system for applying cooling system into it:

1. putt thermal paste, a drop, onto the CPU

2. putt folded Alu foil (2,4,8,16 times ... ? ) over the thermal paste

3. putt on top of all that Aluminum plate that I just forged out of old CP GPU heat spreader

4. putt folded Alu-foil in shape of a smal block, on the place where this copper plate is on original Desire

5. eventually spread some fat copper wires from Alu-plate that is on top of CPU

would this do, just to meet manufacturer's standard ... ?
[HD2 General] vnkn0vvn:
Hi,

I am facing the same issue with my phone. At the moment running on WP 7.5 and android (dual boot).

It's frustrating that I have to stick it in the fridge or outside the window (now that is cold) every time I run an app or anything for too long. It was difficult to install WP7 as it had to be in the fridge all along :P.

I would like to know if there is a way to change the internal board (I mean the faulty part if that is possible) without any soldering work from faulty HD2 parts... lets say from eBay. If it's worth all the hustle.

There must be an easy way to solve this. Too precious phone to bin it like this.

Any suggestions?
[HD2 General] EricTheViking:
You could replace the board without the need for solder, but the difficulty would be obtaining a good board.

Even if you could get one off eBay you'd be at risk of buying one with the same fault.

The only way is to get the chip repaired using BGA rework and be prepared for the phone to die at the first attempt. If you don't have the BGA rework kit yourself you'd need to find someone that's experienced at reworking chips on mobile phones to have the best chance of success. Hot air guns, ovens and the like give you a very low probability of success.
[HD2 General] vnkn0vvn:
Sad to hear this. Such a good phone goes to waste... I probably wont be able to find anybody to fix it. I am better off using it the way it is but only as a spare phone and only in winter period :P .

Thanks,
[HD2 General] zaaaan:
Can you pleaseexplain me the steps to make heat sink foor HTC hd2.need it urgently

whhich metal.whic resin to use
[HD2 General] GRudolf94:
Not long ago I bought a quite beaten HD2, TMoUS. Glass adhesive gone loose, screen dirty from the inside, phone had been opened and badly fixed already. Guess what? No thermal pad over the EMI shields. Here's what I found: you can remove the board from the phone, place a thermal pad of the same greenish-blue kind usually found between the HD2's case and board (pad can be found inside dead laptops) between the CPU and metal shield. Then place another pad between shield and front frame. Put board back in. Place more pads between board and back case. Close it, you're done :grin:

Just as a side note: my phone, even though badly assembled, wasn't overheating. I also found that this works for Nexus One and Desire, those two also put out a lot of heat, and both share the same board.
[HD2 General] zaaaan:
experiment with hd2

Me too was facing HTC hd2 themal problems...

What I did today was

I just put toothpaste on the metal part on the PCB..and a copper foil on it...

till now. No freezes no reboots ...

lets see it in long term run....
[HD2 General] zaaaan:
where i can get this in dead laptops.by the way,i recently got some heat sink compound (white color)..and another one in sliver.which one to use?can i use this???? if yes then where to apply?
[HD2 General] GRudolf94:
Remove the CPU cooler, should find these slippery, rubbery pads on top of some components. Usually found in HP laptops, lots of them which had AMD CPUs failed easily, and they have this stuff inside. Can be found cheaply. Don't use thermal paste inside the phone, as it gets messy. The silver one is better, but still, inappropriate for use in a phone. I see you're using a Nexus One. You want to apply thermal pads between the QSD8250 chip on the rear side of the board (under metal shield, careful, shields held by copper tape) and the metal shield covering the QSD8250. Put a pad between the metal shield and the phone's display. Careful there, a pad too thick will force the display and break it. Last one, put a pad between the MicroSD slot and the aluminum frame of the phone. There already is a small pad there. Remove it.

Sent from my LG-P768 prototype
[HD2 General] butterfly666:
Nice one mate. In a couple of days I will recieve a hd2 with heat issiue as well. I will try the above stept with the pads maybe.

To be continued ;)
[HD2 General] tooAlive:
Man, great info on here!

I'm especially curious about your mention to use the oven. It's actually not too uncommon to place dead computer components in the over for a bit to fix broken solder points by reflowing them.

Curious to see how this turns out for you.
[HD2 General] butterfly666:
Tried it with the pads but no go... :p
[HD2 General] pataro:
Ideos S7 105 baked and works

Yesterday I baked in the kitchen oven the motherboard of my Huawei Ideos S7 105, and now almost every thing is working. Reboots and hangs finished!!!!!!

I've read the entire thread and recognice the problems I was suffering since a year ago.

So, better baked than bricked

But the oven fixed the problem.

Only colateral damage in one speaker, maybe due to a incorrect rebuild.

Its working fine with GPS, Google maps and every thing.

Before cooking it was only able to do hard work inside the freezer, for example load the last room.

Difficult unmounting the motherboard, specially screen connector, same as remounting.

Work in the oven was 10 min at 100 C and 5 min at 250 C, then natural cooling, half hour.

Rom ideos. s7 froyo from joenilan

thanks to all
[HD2 General] psytr0nic:
I read it once more yesterday , how usfull it is, I learned few things yesterday ...
[HD2 General] GnatGoSplat:
My phone is fine most of the time, although it slows down a lot in games. It also reboots itself in Antutu after the green genie benchmark - but not every single time, just about 90% of the time. Being intermittent like that makes me suspect heat.

I was just curious, is there any kind of silpad or heatsink compound between the SoC and metal shield? If not, I'm thinking that might help a lot more than an air gap.
[HD2 General] retrorobot:
So the procedure is this :

remove motherboard emi shield.

put motherboard with cpu facing up on the ceramic cup

turn the oven on 200 degrees , and wait ten minutes.

the heaters in the oven should be the bottom ones , not the top ones?
[HD2 General] xandros9:
nope, nothing.

today, i've torn down an HD2 i got recently and I'm debating what my next step will be. It seems to be a Stage 3 and I saw the 2011 update on OP's post #1 regarding heat sinks. But I'm still tempted by it as a lower-risk solution, but I read the more indepth note about that.

I think I'll try baking it and rolling the dice for lack of any other option once I pony up the courage. But then again it's useless anyway.

[MENTION=3866320]retrorobot[/MENTION]

looks like the gist of it, but you can't really say for sure. I've even seen temps of 400, but I'm pretty lost. I guess our best bet is trying to glean a ballpark temp from the success stories here.

(yes I know this thread is a little bit old)
[HD2 General] GnatGoSplat:
Thanks. I think a silpad between the SoC and shield would be a good idea. I have a Linksys router with a chip that gets very hot, it has a silpad between the chip and shield cover, and the entire metal cover gets VERY hot despite the chip being half its size so this method must work. If the shielded cover doesn't make full contact with the metal LCD chassis, then maybe another silpad between the shield and LCD chassis would further help to dissipate heat. My phone has not really reached even stage 1 yet, so this would probably be the best time to do something.

On the other hand, if I choose to stick with Android, there are better Android devices out there. In fact, my RAZR M is a better Android device. I mainly just keep the HD2 in the hopes of seeing new and cool development on it, but I haven't seen anything new and exciting come out for the HD2 for some time. I had hoped to see a bit more progress with WP8 for example. Maybe it's just time to move on.
[HD2 General] GnatGoSplat:
Took my HD2 apart. I found there is very little air space between SoC and shield. I put some heatsink grease on the SoC, put the shield back on a took it off, and saw grease on the shield so it looks like they are almost touching. I put some grease on top of the shield and only a little bit got on the LCD chassis, so they are almost touching, but not quite. I saw on eBay the silicone thermal pads come in 0.2mm and 0.5mm thickness, which might work between the shield and LCD chassis.

I did notice just with the heatsink grease between SoC and shield, and a little grease between shield and LCD chassis (though with rather poor contact), I can now play Fruit Ninja without any pausing or slow-down! It's never been like that before, so it seems my idea really worked. Might work even better if I'd used a silpad between shield and LCD chassis.

Sadly, when pulling the motherboard, I may have damaged the camera flex cable. My camera no longer works. Also, the flashlight works with delay and only through the Torch app that came with Tytung's CM10.1. I used to use Nexus One Flashlight widget, but it no longer works. Torch works, but is delayed. Volume works fine though. Thinking it might be a bad connection, I removed and reinstalled the flex, but same problem. Does this sound like a flex cable problem? I saw I can buy a new flex for $13 on eBay, but I'm not sure it's worth the cost, effort, and possible gamble because maybe it's not the flex.
[HD2 General] tauqeer512:
i am having the same problem please add snapshots for the first post have removed...

Tx
[HD2 General] tauqeer512:
put in micrwave after starting the oven audio 3.5 jack burn out with in first 5 seconds i plged out the oven switch instantly when i hear the burning sound..advice me how to proceed with this experiment safely

Thanks
[HD2 General] storkk:
Hi guys.

What about halogen projectors? :)

Today I was able to easily remove all components from a "normal" board, taken from an old UPS, by placing it on top of the lamp. After about one minute it was hot enough. I don't have a decent thermometer, but I bought one of those to put into the oven. Directly on the outer glass of the lamp it indicated 170ºC. Then I tried the same trick with a motherboard of a dead Motorola. This time I wasn't able to remove almost nothing. I then placed two pieces of aluminium foil on top of the lamp to cover the rest of the space that wasn't covered by the board itself. After that I successfully managed to remove all the components from the board, including the CPU and other chips. I didn't measure the temperature with the aluminium foil, but I think it must have increased to about 200ºC.

All this craziness was done cause I also have an HD2 with the odd problem discussed in this thread :( and I don't have a hot air station.

My HD2 even can only boot normally and work for some 5 minutes just fresh out of the fridge, otherwise - no way.

What do you think?
[HD2 General] 441Excelsior:
use electric oven (hot air) !!! NOT MICROWAVE!!!! it will kill your device instantly with microwaves
[HD2 General] abufaris:
i did all of ur steps bu the same,the same thing,but i found something,the device stop freezing,just restarting then stuck at green htc ,what do u thing the cause for?
[HD2 General] januszgorlewski:
About advertisement we can ask news writers to give us a hand? good idea?