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Go Back   GSM-Forum > GSM & CDMA Phones Hardware Repair Area > Hardware Equipments for GSM > RE-7500 Reworking System & iSolder

RE-7500 Reworking System & iSolder the Infrared Reworking System - Product By Jovy Systems. & iSolder the intelligent soldering machine

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Old 11-21-2009, 01:01   #31 (permalink)
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TNX, I will give them a try. Looked into the TEC and seems to me as though you will not be able to control the quantity of heat that it will generate with the small fan/heat sinks that are in the laptops. may need a controlling circuit. Sounds like a lot of R&D to me. Good luck.
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Old 11-21-2009, 01:22   #32 (permalink)
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on compaq f500 for example, the video chip is embedded in the northbridge chip, (nvidia g6150) .

on inte lcore2duo based machines the wifi never fails before the video section because the northbridge of these machine (intel 945-965) is very strong and never fails. the only fails happen is the grafic nvidia chip, in almost cases due to fan clogging
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Old 11-21-2009, 01:27   #33 (permalink)
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forget peltier cooling... you will be in trouble with a lot of moisture that will liquify on the cold side of the plate causing shorts when the drops rheach the motherboard.
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Old 11-21-2009, 15:48   #34 (permalink)
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thx a lot

great, i never thought the northbridge was the cause of the wifi problem on the hp amd systems. everything i have learned to do is due to experience and webresearch. my associate has an electrician degree but he doesnt have a clue on this hp issues. he taught me how to heat the video chip and he thinks the wifi issue is caused because the "lane" (i dont know how do u call this in english, but i actually mean the electric path on the motherboard) of the wifi goes in the same video chip lane. so by heating the video chip he fixes the wifi issue. he will be surprised when i tell him about the north bridge problem. by the way do u know how much temperature can the nvidia video chip resist? what is the hottest i can get without burning it? and regarding the problem with the northbridge: does it have to be replaced? or just heated?
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Old 11-21-2009, 16:52   #35 (permalink)
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i don't know exactly, you have to look to the datasheet if you can find it.

i think something about 250 degrees celsius, but only if the chip is stored with a maximum percentage of moisture of 10%.

increasing the moisture level , increasing the chances to damaging it by popcorn effect even at lower temp
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Old 11-22-2009, 00:42   #36 (permalink)
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Wifi is on the PCI bus, so whatever chip controls that would be affected. My guess would be the GPU is not part of that circuit.
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Old 11-30-2009, 22:14   #37 (permalink)
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The temperature for heating lead free based NVIDIA GPU chips in laptops like HP DV2000/6000, Compaq V3000 series, etc boards is 215 degrees centigrade. You can go upto a maximum of 225 degrees only if needed and generally 215 degrees will do the job. Through the experience of a colleague of mine the Nvidia GPUs get permamnently damaged at 240 degrees centigrade, so please don't reflow at temperatures above 225 degrees. I use 225 degrees sometimes to remove NVidia GF 6150 , but there are times even when 215 degrees is enough.

Best regards.
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Old 12-11-2009, 10:08   #38 (permalink)
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which chip is actually the north bridge chip on a dv6000? my wireless is not working even after the GPU reflow - video works great though
and which chip is for the battery charging - i know alot of these have battery problems where it does not charge
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Old 12-11-2009, 16:42   #39 (permalink)
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actually i have a 6925se version
there seems to be one nvidia northbridge chip and there looks like a southbridge nvidia chip by the pci slots - that would be the southbridge correct? could that one cause the wi-fi problem also?
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Old 12-14-2009, 04:48   #40 (permalink)
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its a 6125se not 6925se

my laptop is a 6125se not a 6925se
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Old 12-14-2009, 09:15   #41 (permalink)
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in HP dv6000 series the northbridge is the NVIDIA GF6150 GPU.
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Old 12-14-2009, 14:31   #42 (permalink)
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Wi-Fi Trouble still

I have reflowed that chip several times and still no wi-fi
even tried to reflow the southbridge to fix the issue

before a reflow worked on this board and the last time i put some pressure on the chip during reflow and the wi-fi has not worked since - not sure if that did it or something else - video has been great

sometimes when i trun

also is the northbridge chip the reason for the battery problems in these boards where it won't charge a good battery?

thanks
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Old 12-18-2009, 01:05   #43 (permalink)
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Is the hardware not being recognized in device manager?
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Old 12-18-2009, 06:33   #44 (permalink)
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yea nothing in device mgr

i've tried pressing on the card and it does not get detected - works fine in another machine - don't know if i can do a voltage check some where or if its in the data circuit - i also tried reflowing the southbridge too but no luck so far - any ideas?
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Old 12-18-2009, 23:39   #45 (permalink)
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Are you referring to the Wi-fi card. You are working in the dark if you don't have the schematic.
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