Hi! Help me please troubleshoot this laptop.
Recently, about 3 moths ago, laptop came to my service with code 43 on discreete nVidia VGA card N18P-G62-A1. For some time user was running 3D games on integrated video. Mats had shown errors with VRAM chip. I`ve decided to replace all of them and also had to reball videochip. Everything worked fine.
Now it returned with no image on LCD nor HDMI. Still, laptop seem to boot fine, it plays logon sound, connected USB devices are recognized when plugged in. But no IGFX voltage appears on CPU, only for short time (fraction of second) during power up. Switching node waveform of this supply seems to have no problems, like voltage just powers down on external command. Flashing BIOS with dump from downoad page gave no result. CPU (SRH84) resistances are R_vccio= 40, R_vccsa= 14, R_vcccore= 1.5, R_vccgfx= 4.
There is other problem, thermal grease was pushed out from one end of CPU silicon, while i`ve definitelly put it there. I believe it happened due to excessive heat on IGFX. I`ve used Thermalright TF8. All thermal pads also was replaced with new during previous repair.
What can I try besides CPU replacement? Could it be PCH problem?
Recently, about 3 moths ago, laptop came to my service with code 43 on discreete nVidia VGA card N18P-G62-A1. For some time user was running 3D games on integrated video. Mats had shown errors with VRAM chip. I`ve decided to replace all of them and also had to reball videochip. Everything worked fine.
Now it returned with no image on LCD nor HDMI. Still, laptop seem to boot fine, it plays logon sound, connected USB devices are recognized when plugged in. But no IGFX voltage appears on CPU, only for short time (fraction of second) during power up. Switching node waveform of this supply seems to have no problems, like voltage just powers down on external command. Flashing BIOS with dump from downoad page gave no result. CPU (SRH84) resistances are R_vccio= 40, R_vccsa= 14, R_vcccore= 1.5, R_vccgfx= 4.
There is other problem, thermal grease was pushed out from one end of CPU silicon, while i`ve definitelly put it there. I believe it happened due to excessive heat on IGFX. I`ve used Thermalright TF8. All thermal pads also was replaced with new during previous repair.
What can I try besides CPU replacement? Could it be PCH problem?
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