What I had to do to get a laptop back to the customer before factory heat-sink is replaced.
|DV5-1124 motherboard without heat-sink|
It consists of a copper pad, plastic sheeting (on underside of pad) with a cut out hole. The copper bridge soldered to the pad was to act as a heat bridge to transfer heat to the original heat-sink. This is not a recommended repair, only a temporary fix. There were no guarantees presented with this method, and only allowed the customer time to use the important files until the correct part arrived. There were no temperature measurements taken after the 'fix' only run-tests.
|DV5-1124 motherboard with |
With the various model numbers of the DV5 series, it is wise to pay attention to the dash numbers of motherboard replacements. DV5-xxxx -
In this case: the original board was DV5-1125 and replaced with DV5-1124. The minor difference in the model number had larger implications. The original used shared video memory and the replacement uses on-board memory. Though more ram memory available is for Windows/applications/programs, an additional part (MMU heat-sink) was needed. I hate to do mods but had to in this case.
Note: plastic sheeting with cut-out for MMU ceramic was done because the chip has resistors on top, if there was no insulation it would present an opportunity for the copper pad to short the resistors,If laptop grabbed from bottom or picked up in an unusual manner. This would either blow the MMU chip, or cause improper memory addressing, depending on what section is shorted. MMU heat is transferred across bridge to larger mass of the main heat-sink. Engineering students may need to know thermal dynamics well to understand how heat travels.
Note: High Temperature hot glue was used on corners to hold copper pad to chip after thermal compound was applied to copper pad. The glue is easily removable when cooled, without pulling parts from motherboard.
Note: The 2cm rubber blocks were used to press the copper pad down when reassembled into case.
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Do Not Copy this method since it is a temporary repair!~