Hey guys, bit stumped with this laptop after replacing 2 blown components i.e., MP86493, MP2979A.
To begin with, this laptop was dead-dead.
Now with replaced (visibly) blown components, i do get some progress; after connecting battery or main cable;
I tried to emergency flashback the Bios but its not recognising USB. Also tried various RAM sticks.
There is no 'heat' at all from the smaller die (PCH?) on the CPU chip ? Even the coils to it are cold, but voltage is there at the coils/mosfets.
There are no shorts on the board as far as i can tell... also tried injecting 1V, 2A at cold coils and nothing heats up on thermal camera?
Grateful for any guidance/pointers on what to test/check next ? cheers
Burned Chips replaced;
MP86943 MP2979A
To begin with, this laptop was dead-dead.
Now with replaced (visibly) blown components, i do get some progress; after connecting battery or main cable;
- am getting white power led
- 5-long-flashes on CAPS Lock and NUM lock
- then, fan full speed
- CPU heats up some (smaller die PCH, does not)
- always constant black screen no matter what's tried
- no USB recognition
- no HDMI output
I tried to emergency flashback the Bios but its not recognising USB. Also tried various RAM sticks.
There is no 'heat' at all from the smaller die (PCH?) on the CPU chip ? Even the coils to it are cold, but voltage is there at the coils/mosfets.
There are no shorts on the board as far as i can tell... also tried injecting 1V, 2A at cold coils and nothing heats up on thermal camera?
Grateful for any guidance/pointers on what to test/check next ? cheers
Burned Chips replaced;
MP86943 MP2979A
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