Nvidia GPU chip problem

[c14h3r]

Hy folks,
I've read all the pages on this thread and i'm glad that finally i found something on that theme.
I don't reball or reflow chipset's yet but i'm confronting a problem a don't know if is my mistake or hardware failure.
So let me start: it's about a Fujitsu Esprimo Mobile (don't remember exactly the model so i'll skip it) equiped with Intel T4400 and an nvidia 8200M G video card (integrated in MCP79 if i'm not wrong). The notebook stops every 30 min (suppose it was used on bed or other soft surface). Kept on table it stopped after 12 hrs. I installed HW Monitor for temperatures and i got: CPU 70 - 75 C, GPU 80 - 85 C in idle. I opened the back cover, clean up the fan and radiator, removed the silver foil and paste under and replaced with arctic silver 5. After power on, there was a slight difference on CPU temperature ( 3 - 6 C in minus) but the GPU still hot. I opened again and carefully removed the thermal pad from the GPU radiator. I substituted with an aluminum shim (same thickness with the thermal pad on pressure zone), cut on the crystal dimensions, put thermal paste between crystal and shim and thermal paste between shim and radiator. I must specify that the GPU radiator is a copper plate built in a aluminum plate. Power on again, start the temp monitor and surprise, i gained about 10 C in minus in idle for the GPU. In stress tests (Video card stability test and Burn In Test) the peak temperature was 90 degrees for a second the rest being set at 87-88 degrees for about 4 hours of stress. Now the idle temperatures are CPU 45 - 50 C, GPU 70 - 74. Upon my opinion they are still high or maybe i'm wrong. I don't know the max operating temperature for GPU or chipset as for CPU the max operating temperature is 105 C. Do you have any idea or advice for me to lower more the temperature? Thanks in advance.

[Dan Collins]

c14h3r, sounds like the damage is already done. You will need a reball before the chip gets damaged. CPU temps should not exceed 70C for good working laptops. If you cannot get better temps, replace the CPU. And another point, it is impossible to keep temps low during prolonged 100% CPU usage. The poorly designed cooling systems cannot maintain cooling. Bottom line is most laptops cannot handle CPU or graphic intensive applications. It is a fact of physics. Use a desktop where you can install decent cooling units.

[c14h3r]

Thanks for reply and your time. I forgot to specify that the laptop is not mine and was used mostly in bed (that's i suspect). After changing the thermal paste, in full load, the CPU gets 66 C (that's OK) and is constant. The GPU tmeperature in full load reaches 87 - 88 C... while in idle the CPU is on 50 C most of the time (droping from time to time to 45 - 43 C) with a plus of 2 degrees while general use (not gaming) and the GPU is on 77 - 79 C constantly. Maybe is not so bad but i want to be sure before taking any actions.

[Computek]

Originally Posted by gatolt

Hi
Does anybody have experience reflowing MacBook PRO GPU. Laptop will not boot-just fans spins for couple of seconds and then turns of. But if I remove memory laptop gives beep code and it will not turn off until I will not switch it off. I guess POST will not go beyond memory test and will not reach GPU. Just question- will reflow help? It is nVIDIA G84 GPU famous for failure. Any ideas?
Thank you

newbie to the forum but an experienced computer tech (About to finally stop being lazy out sourcing BGA work and do it myself)..

Was searching for tips on removing that *** awful epoxy resin and there doesn't seem to be an easy solution [sadly] when I spotted this post which I might be able to offer a ray of hope for folk.

if you contact Apple customer care you can actually get the MBP repaired free of charge . i.e. replacement MB if it is suffering from the nVidia GPU issue. Only happened on certain models and covered the 8400 and 8600 family of chips. (If I remember correctly). Apple actually took a class action against nVidia and won leaving them to foot the bill for any failure of MBP's due to the issue. Source (Actually one of many sources)..

You need to hassle Apple C.S. they then arrange (Via your serial number) for you to take to one of there approved repair centers. Repair is free. (I had it done not long ago on a friends MBP)...

Hope that helps..

n.b. Any good tips for removing that resin?

[Nicpoe]

How can i set the graphics speed and cpu core voltage to lower values?

[kerim92]

hi experts,

i've always done chip reball, change or chipset voltage problems successfully.

many dv6000 amd boards has gpu and bridge problems. but sometimes customers bring really bad boards. i was have 125pcs dv6000 dead motherboard. all motherboard saw many repairman's hand. not all boards are in good conditions. i repaired 80 pcs of them. many of them has gpu and other bridge, chips or power problems. now remained 45 motherboards that all have 1 long 2 short beep problem.

i have a test mobo. there are no chipsets on that.
i am testing all chipsets on that mobo.

So i ever put tested and working gpu's on that 45 mobo.but still board give me 1 long 2 short beep gpu problem and no success.
followed voltages, looks like fine. max's 1993-2 also looks like fine. all L's and 0 resistors back of gpu looks like fine. i try to change them.. no luck.


now that mobo's waiting to repair. in this reason i wanna know expert's opinion.

Thanks in advance....

[kerim92]

Originally Posted by Nicpoe

How can i set the graphics speed and cpu core voltage to lower values?

you can, if you know assembler or bios editing programs.

if cpu overheat you can edit your windows power managament settings "cpu performance" you can access it on your windows bar battery icon.

you can change cpu performance value to %100 to %70.

i do it to all repaired mobo's operating systems. 65c cool down to 38c idle.

[hifihifi]

hy

--------------------------------------------------------------------------------

hi experts,

i've always done chip reball, change or chipset voltage problems successfully.

many dv6000 amd boards has gpu and bridge problems. but sometimes customers bring really bad boards. i was have 125pcs dv6000 dead motherboard. all motherboard saw many repairman's hand. not all boards are in good conditions. i repaired 80 pcs of them. many of them has gpu and other bridge, chips or power problems. now remained 45 motherboards that all have 1 long 2 short beep problem.

i have a test mobo. there are no chipsets on that.
i am testing all chipsets on that mobo.

So i ever put tested and working gpu's on that 45 mobo.but still board give me 1 long 2 short beep gpu problem and no success.
followed voltages, looks like fine. max's 1993-2 also looks like fine. all L's and 0 resistors back of gpu looks like fine. i try to change them.. no luck.


now that mobo's waiting to repair. in this reason i wanna know expert's opinion.

Thanks in advance.... ------------------

Have you tried to replace the Nothbridge with a NEW chip?

[Trion]

@kerim92,

Replace GPU with new ones.

B.R.

[hifihifi]

This MOBO won't boot. Standby LED is working.
The +3,3V is like comming through the +2,5V (DDR).

Without schema it is hard to find the problem.
Has anyone an idea or the schema?

[kerim92]

Originally Posted by Trion

@kerim92,

Replace GPU with new ones.

B.R.

i have new or tested (by me) chipsets into my stock.
i try new chipsets too. north, south and gpu...
not chipset problem. (motherboard chipset place good, ways and points good too)

if you read my post carefully you can see i try every time tested and working chipsets... if a gpu not work on bad mobo im tryin' that chip on my test mobo for try. i see all time gpu good. and past 3dmark05 1024*768 with 1g ram...

this is not chipset problem. all voltages are good too. was try update bios and change bios eeprom too.


really bad problem. still no solution

[Trion]

Have you checked signals on the board with an oscilloscope or logic probe? Could be broken tracks or some other faulty components. Without actually having the board for testing its not easy to guess whats wrong with it.
In laptop repair there's so such thing as 100% repair success. Most repairers are happy with 70-80% success rates. Even this can be quite profitable and good for the environment too besides helping with people's budgets.

Sometimes the 20-30% of non repairable boards come all at once..... Its all about numbers, chance and statistics.

[Nicpoe]

Have anyone repaired a Aspire Laptop? The Northbridge Chip mcp67mv-a2 is very hard to find and expensive too. Any Alternitives there?

[Trion]

@Nicpoe,

The NVIDIA MCP IC is a very problematic IC used by Acer and Compaq. As of now only 50% chances with new MCP ICs. Don't know why NVIDIA decided to integrate North and South bridge into one chip when there's so much space inside 14" and 15" laptops. I could understand if they were trying to fit it into a netbook. But its so small and as per Nvidia design specificartions the specified heatsink as usual is too small to cool the chip and with lots of use the chip fails.

[oudeh528]

im looking for what temp the gpu need to be in and for how long to fix the heat problem and if somebody have the same info for xbox 360 and ps3 i will appreciate it very much