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Adding a 2nd fan LAPTOP, only (1) fan header. THE ONLY OPTION to add the second fan is to use a 5v 3-wire OEM fan

post #1 of 6
Thread Starter 
On a LAPTOP I'm wanting to add another fan. (Internally within the case.)

Laptop in question is known to run hot.
As it is currently - existing fan (3-wire 5v, .35amp) runs on LOW speed all the time, Upon any minor cpu access @ around 63C fan ramps up in speed to HIGH which is highly irritating.

Cooling system as been cleaned /new thermal paste applied.

DUE TO SPACE CONSTRAINTS (It's a Laptop) THE ONLY OPTION to add the second fan is to use a 5v 3-wire OEM fan.

There is (1) 3-Wire fan header on the board feeding the existing 3-wire 5v .35amp fan. The motherboard is silk-screened for a 2nd fan, BUT there is NO FAN2 HEADER.

EDIT: There is a unused solder pad labeled CN29 on the laptop's motherboard the cable from FAN2 would attach if it had one, but this model laptop (AMD Cpu'd version) was never offered with the option for a 2nd heatpipe /fan 2. Higher spec'd models with Intel CPU did have option for a second heatpipe assembly /Fan.
(This being shown in thread linked to above)

If they used the same size traces and the chipset between the Intel and AMD versions I wouldn't be freaking out.

Since I don't have a Intel version of the board handy, and /or additionally a SERVICE MANUAL / MAINTENANCE MANUAL to look at it's a crap shoot.

BTW: Laptop is a TOSHIBA Satellite 18.4" P505D-S8935, AMD CPU RM-74, Radeon 3200 GPU
Yes a dog, but the price was right and I'm trying to save it from going to a landfill.


Current draw of existing fan and the additional fan I am wanting to add is .35amp each.

From my research the existing fan is "Voltage" (3-wire) vs PWM controlled (4-wire).


What are my options?

Major concern is "extra" current draw KILLING the FAN1 header. Unlike a desktop on laptops it is expected a bad fan is going to be replaced with the EXACT same spec'd fan which means most likely if the header is designed at .35amp draw it won't handle much more than that.





***************************
Oh,

Here is a thread on what I'm trying to do, but alas NO ONE HAS POSTED ANY USEFUL INFO.

http://www.overclock.net/t/1470638/laptop-toshiba-p505-series-cooling-mod-double-capacity-of-stock-on-the-cheap-pwm-mod/0_100




.**************

Word tags:

Add additional fan to Laptop
2nd internal fan
Laptop
505 series
Increase cooling
Throttling
Reduce noise
Temp Temperature
Overheat, Overheating
3-wire, 3-pin auto speed control controller
Heatsink
Heatpipe
Edited by WeAreNotAlone - 3/5/14 at 11:06am
post #2 of 6
It'll be fine anything under an amp. I've seen the same header used on GPU fans pulling over an amp tongue.gif
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Ayase Eli
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by DaveLT View Post

It'll be fine anything under an amp. I've seen the same header used on GPU fans pulling over an amp tongue.gif

LAPTOP FAN HEADERS are rated at 1amp?

There is a unused solder pad labeled CN29 on the laptop's motherboard the cable from FAN2 would attach if it had one, but this model laptop (AMD Cpu'd version) was never offered with the option for a 2nd heatpipe /fan 2. Higher spec'd models with Intel CPU did have option for a second heatpipe assembly /Fan.
(This being shown in thread linked to above)

If they used the same size traces and the chipset between the Intel and AMD versions I wouldn't be freaking out.

Since I don't have a Intel version of the board handy, and /or additionally a SERVICE MANUAL / MAINTENANCE MANUAL to look at it's a crap shoot.

BTW: Laptop is a TOSHIBA Satellite 18.4" P505D-S8935, AMD CPU RM-74, Radeon 3200 GPU
Yes a dog, but the price was right and I'm trying to save it from going to a landfill.

PS: The fan being added is from one of the High-end spec'd Toshiba Qosmio X505 Series .... it pulls the exact same amps the as shipped with fan does .35amps. I don't know the full history of the 505 SERIES but I don't see any laptop fans for the Qosmio X505 Series using fans over .35amps.

Processed By eBay with ImageMagick, z1.1.0. ||B2




.
Edited by WeAreNotAlone - 3/5/14 at 11:18am
post #4 of 6
Ahh ... I'm sure 0.5amps is the upper peak limit then.
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Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm ID Cooling Frostflow 240L 
CoolingCoolingCoolingCooling
ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 x2 Phanteks F140SP 
CoolingMonitorKeyboardPower
Delta AFB1212SH x2 Dell U2713HM CM Storm MECH FSP Aurum PT 1200 
CaseMouseMouse PadAudio
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CPUMotherboardGraphicsRAM
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FSP Aurum PT 1200 CM Storm Mizar 
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Ayase Eli
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Testbench
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CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 ASRock X370 SLI Killer Zotac GTX1070 "FE" with ID Cooling Frostflow 240G Crucial BallistiX Sport LP 16GB 8x2GB 
Hard DriveHard DriveHard DriveCooling
Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm ID Cooling Frostflow 240L 
CoolingCoolingCoolingCooling
ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 x2 Phanteks F140SP 
CoolingMonitorKeyboardPower
Delta AFB1212SH x2 Dell U2713HM CM Storm MECH FSP Aurum PT 1200 
CaseMouseMouse PadAudio
Phanteks Enthoo Pro Logitech G102 Tesoro Aegis X3 Virtus.Pro AKG K7XX 
CPUMotherboardGraphicsRAM
Intel i7 6700k Gigabyte Z170X-UD5 Depends Depends 
Hard DriveCoolingMonitorKeyboard
Plextor M5S Depends Dell U2312HM CM Storm Quickfire Rapid-i 
PowerMouse
FSP Aurum PT 1200 CM Storm Mizar 
CPUMotherboardGraphicsRAM
Intel i7 2600 4GHz Gigabyte Z77X D3H Intel HD Graphics 2000 obviously Kingston HyperX Genesis 4X4GB DDR3 1600 
Hard DriveCoolingCoolingCooling
Intel 530 240GB Deepcool Captain 240 Arctic Cooling Bionix 140 Delta AFB1212L 
OSPowerCase
Windows 10 Pro CoolerMaster G750M NZXT Switch 810 
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by DaveLT View Post

Ahh ... I'm sure 0.5amps is the upper peak limit then.


Any thoughts on a 3-wire control scheme?

If it had a 4-wire header on the board, I'd use a powered PWM splitter.... But FAN1 header and the fans themselves are 3-wire.
I don't care about the BIOS reading the speed of the 2nd fan, only some kind of automated control scheme to kick in the "additional" fan to high if needed.

Sort of thinking with the SECOND HEATPIPE assembly that is being added which will (*Almost) double the cooling system capacity the 2nd (5vdc) fan (FAN2) could be hardwired @ 3vdc.... no control circuit would be needed.

******************

RM-74 / Radeon 3200 STOCK Heatpipe assembly: CPU at beginning of heatpipe (Section with (3) attachment legs, GPU afterwards (yuck)






What I plan on doing is "FLIPPING" the second assembly so the section with the "tits" on each heat-sink assembly are interlocking and bond them them with thermal epoxy. End result looking something like this after cutting off the 3rd leg /all legs off the second heat-pipe assembly.

Figured it will *"almost" double the cooling capacity, the net effect fan speed will be reduced /fans won't ramp up during transient CPU spikes.

Processed By eBay with ImageMagick, z1.1.0. ||B2




PROBLEMS:
1: The two heat-pipe assemblies interlock PERFECTLY, but #2 heat-pipe will have to be bent so both heat-pipes are at the same "height"....
(You can see the offset in pics of stock heatpipe)

2: Extra weight of additional heat-pipe is a factor. Got to support it somehow.

3: Fins (Radiator) of 2nd CPU heatsink which is being added is around 16mm in height, and GPU cooler shown in pic is a little less than 13mm so that creates a slight problem as motherboard is directly above the 2nd heatpipe... either I cut down the fins... or heat up the lower base (PC-ABS) and remold it /cut it /reshape it to allow for the extra depth needed.



CONCERNS:

1: Sections that will be " bonded" are in the region of the heatsink that are designed for GPU vs CPU section, so I have concerns added pipe will add exactly 100% more cooling capacity

2: The additional heat-pipe may add too much cooling capacity.
.
Edited by WeAreNotAlone - 3/5/14 at 1:02pm
post #6 of 6
Could you use a small voltage control on 2nd fan and adjust it with a small screwdriver though a hole in case?

I would not worry about over-cooling. My sig system idles very near room temp and never goes above 50c.
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Overclock.net › Forums › Cooling › Air Cooling › Adding a 2nd fan LAPTOP, only (1) fan header. THE ONLY OPTION to add the second fan is to use a 5v 3-wire OEM fan