Question about Foxconn 45CMX socket LGA775 motherboard (16897)

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Chip set can i replace a heat sink on the chip set

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Generally yes. But if Foxconn glued the heatsink on, then it is problematic at best.

Usually the chipset heatsinks are not glued but do use some type of thermal tape or paste that transfers heat to the heatsink. There are typically two plastic inserts or screws that go from the heatsink THRU the motherboard and come out on the other side. This will require you to remove the motherboard form the PC case to do this mod.

You remove the heatsink, clean up the contact area with 90+% isopropyl alchohol with a lint-free cloth until the original goo is removed. Put a small amount of your new thermal paste such as Arctic Silver 5 (AS5) (about the size of a grain of rice) and spread it even over the chip's contact area with a credit card edge or other straight plastic edge tool. Using a baggie over your finger, smear a very thin coating of AS5 (or other) onto the bottom of the new heatsink. Put it all back together again and you should be good to go.

Posted on Jan 27, 2009


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Bad processor on my hp compaq

WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. - rules

The "CPU" or central processing unit, otherwise known simply as "the processor," is the primary "brain" of the computer.

Processors are very finely engineered components that are not repairable.

But replacing a failed processor is an option for the owner of any model Compaq Presario desktop computer.

Just check with HP/Compaq for the correct size and speed of processor for your motherboard before purchasing a replacement.

Turn off the computer and disconnect all cables.

Remove the cover.

Lay the computer down flat.

If there is a plastic hood covering an exhaust fan, remove it by pressing in on the indicated release tabs.

Examine the processor assembly.

The processor is a square chip that is covered by a metal heat sink with fins.

A fan will often be mounted on top of the heat sink; unplug its connection to the motherboard.

Two clips usually secure the heat sink assembly to the top of the processor.

Gently press down and slightly away on the flat end of a clip to release it.

Avoid using a screwdriver to release a clip a slip could scratch the motherboard.

Release the clips and gently remove the assembly.

The heat sink should separate, leaving the processor behind in the chip holder.

Clean the bottom of the heat sink.

Use a paper towel and a dab of solvent cleaner to remove the old thermal paste.

Set the clean heat sink aside.

Lift up the lever to unlock the old processor and remove it from the pin mount.

Insert the new processor chip.

Align the pins on the processor to the "cut off corner" or dot on the pin mount.

The processor should drop into the pin holes easily.

If the processor won't drop in easily, check the pin alignment.

Once the processor is inserted correctly, pull down the lever to lock in the chip.

Apply thermal paste to the bottom of the heat sink.

Apply enough paste to cover the area of the small gray rectangle on top of the processor.

Apply the paste with a spreader made from a piece of flexible plastic.

Spread the paste evenly to a thickness of two sheets of paper.

Check the heat sink mounting alignment and lower the heat sink onto the top of the processor.

Reinstall the mounting clips.

Reattach the heat sink fan to the motherboard if necessary.

Plug in the computer and monitor and boot.

If the machine won't boot or it emits warning "beeps," unplug the power and monitor, and troubleshoot your work until the computer boots successfully.

Shut down again and replace the exhaust fan hood.

Close up the computer and reboot.

Hope this helps

Nov 11, 2012 | HP Compaq dc5100 Microtower PC Desktop

2 Answers

Gateway ZX4300 Black Screen troubleshooting

Follow this guy's responce on youtube. Worked exactly for me.

Jun 30, 2012 | Computers & Internet

1 Answer

Replace stk392-110 ic's in Toshiba 42h81 tv

Kits are available but price is not real cheap---basically you have to unbolt chassis and release some cables inside to get enough room to pull chassis back and put up so bottom faces rear of set.

In this model both chips are near the middle of the set inside--unsolder all 18 pins on each and the 4 pins that hold each heat sink in---you remove the sink with chip still attached--clean the white grease off, apply new and replace both chips.

Works best if put front chip WITH THE HEAT SINK ATTACHED back in first and repeat with rear sink---it means when you install you have to get 18 pins plus the four pins for the sink installed in one shot.

May not be a task for a first time person.

Jun 05, 2012 | Toshiba 42H81 42" Rear Projection...

1 Answer

Chipset heat sink not detected

The chip set heat sink is not properly installed on the system board.
Ensure that chip set heat sink is properly installed on the system board.
To locate the system-board chip set heat sink, see "System Board Components."

Feb 18, 2011 | Dell OptiPlex GX280 PC Desktop

1 Answer

How to check and replace fuses and chips

this set has a big black chip (2) behind big heat sink aluminum block stk392-250 and the fuses are green very small around chips

Dec 18, 2010 | Mitsubishi WS-65907 65" Rear Projection...

1 Answer

Double imagery,with a yellow bow at the top and bottom,

Look at attached photos and tell me if they look anything like your problem.

Convergence problems are common, this set most likely uses two of the STK-392-150 CHIPS (attached photo of typical chips) and they are 2.5 inches wide and about 1.5 inches tall with 18 pins each. They are mounted to heat sinks with fins and a white heat sink grease is applied to the back of each chip (back is metal) to transfer heat quickly.

After 5-8 years the grease dries out and one of the chips overheats and fails.

This can be a do it yourself repair and if purchased on EBAY a pair of the chips will cost less than 15 dollars (I use a seller there).

Repair consists of getting at chips and replacing them--sometimes they will damage a resistor around them--easy to spot and the resistors are easy to test.

Under 25 dollars total parts cost.

I can assist anyone with this repair and have done hundreds of them myself---based on actual experience I know what to do here.

if the photos or this information told you something you did not know rate this solution as very helpful as I do this here for free.

SD TECHefac2e8.jpg

7869da3.jpgThis is a Hitachi set


Aug 23, 2010 | Hitachi 53FDX01B 53" Rear Projection...

1 Answer

Shadows on the picture


This model uses two convergence IC's----if 3 D one or both are bad.

Most of the time this set uses either two of the STK-392-120 CHIPS.

Both chips and any bad protection resistors around them need to be replaced and the set adjusted.

If you are able to do the repair yourself total parts cost will be under 30 dollars.

Some history for you:
This set like all rear projection2.gif tube type sets uses two chips---the ones in your set are Black in color--about 2 1/2 inches wide X 1 1/2 inches tall and are on either one large or two smaller heat sinks2.gif with fins on them.

When the chips are installed a white grease called heat sink2.gif compound is applied to the metal back of each---the grease transfers heat from the chip quickly to the metal it is bolted to.

After some years the grease dries out from the heat and one of the chips goes instantly.

You can buy a pair of the chips for your set on Ebay for less than 15 dollars plus shipping--

If you cannot do the repair yourself--shop around your area---most shops charge 300-400 for this type of repair. Whoever you get to do it make sure BOTH chips are replaced or you will have the same problem in a few months.

If you open the set and locate the chips---they will have the full STK number printed on them in white letters----there are about 12 resistors around them that need to be looked at--if any are discolored they need to be replaced. (MOST OF THE TIME THEY ARE ON THE FAR RIGHT SIDE IN THIS MODEL ON A VERY LARGE HEAT SINK WITH FINS)

If a shop says it HAS TO GO TO THE SHOP keep looking as any good tech can do this repair right in your home in about 1 hour---I know as I have done hundreds of them.

IF you can solder and are handy I will give you general instructions on how to do the repair and what you need---some people I talk to can either do it or have a friend who can do it for them---let me know

I can tell you what you will need aside from the parts and how to proceed with the fix---

If all this helped rate this solution---I do this here for free.


Regards, SD TECH

Nov 07, 2009 | Hitachi FDX Series 43FDX10B 43" Rear...

1 Answer

Do the heat sinks have to be desoldered out for replacing the convergence STK392-110 for Toshiba 43hx71 projection TV? Thanks

Yes----These are not the most easy sets to do this on---you will find on the bottom of the board 4 metal tabs for each heat sink---you have to unsolder them and all the pins on each chip------

The real problem is when you replace the chips (remember to put heat sink grease on the new ones) you have to put them back and get all 18 pins from the chip and the 4 pins from the heat sink to go into the board cleanly---

With both heat sinks and chips removed---check all the identical resistors around them---most are 1.8 ohm ----if you miss any of them you are going to have the same problem even if you change the chips--they can be checked like checking a fuse--no reading means open.

When I do these sets I usually put the Chip and heat sink that is towards the front in first---once it is in hold it in place and tilt the chassis up and solder the heat sink tabs in to hold it there--do the same with the rear heat sink and chip and then carefully solder all the pins on both chips in-----it is very important that all the pins on the new chips are perfectly straight or you will have fun getting them and heat sinks back in.

It is also a good idea to clean the bottom of the board where the chips were soldered in with acetone or denatured alcohol before you solder the new ones in--I suggest also using liquid solder flux before you solder all the pins in.

If you have success let me know and I can tell you how to get into the TECH menu which allows fine adjustment of the convergence ALL OVER THE SCREEN.

I am here to help people.


Oct 18, 2009 | Toshiba 43HX71 43" Rear Projection...

2 Answers

Blue Convergence wont move left and right

Near the middle of the chassis inside you should see two large metal heat sinks---the chips(2) are black and about 2 1/2 inches wide x 1 1/2 inches tall and should have the STK-392-110 NUMBER printed on them in white.

The hard part of this is first you have to unplug several cables so you can get the entire chassis tilted up so the bottom of the boards face the back of the set. You have to unsolder all 18 pins on each chip AND 4 metal pins on each heat sink--when you replace the chips(apply heat sink grease to them) the hard part is getting all the pins on the chips and the pins for the heat sinks lined up so they go back into the board.

Then holding a heat sink and chip in place solder each chip/heat sink back in.

IT IS A VERY GOOD IDEA WHEN YOU REMOVE THE CHIPS TO CHECK ALL THE DARK GREY RESISTORS AROUND THEM---most are 1.8 ohm 2 watt---they can be checked like checking a fuse--if one of them is open you will still have the same problem if you do not find and replace it---they are protect parts---if one is open--one of the chips got it.

After you replace you can go into the TECH menu and fine adjust the convergence--you can do the same in the customer menu but the TECH menu offers more places to adjust and saves these adjustments---I have instructions for getting into that menu if you need them.

If you can do the repair yourself you can save a lot of money as most shops get 300 or more for this type of repair--a pair of the chips can be bought on Ebay for about 12 dollars plus shipping.

If you have any questions or need advice reply to this posting here.


Sep 30, 2009 | Toshiba 43H70 43" Rear Projection...

3 Answers

K8S-LA mobo heat sink fell off.

That is the 'Northbridge' chip that provides the I/O interfacing for the main chip. The heat sink is normally held on with glue as you surmised, and should be re-done with a thermal conductive glue. The glue (a silver filled epoxy) is available from MCM electronics or from Mouser. Be sure to thoroughly clean the chip and heat sink before re-gluing.

Sep 01, 2008 | ASUS K8S-MX SIS 760GX CHIPSET SERIAL...

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