Quick Checks
1.Take of all non onboard device : processor , memory / SODIM , bloutooht , webcam , modem , wifi , card reader etc.
2.Check and test processor/SODIM, then switch it on again .
3. Do a physical check on the motherboard components: memory sockets loose , component crashes , burns , cracked , broken or any form of physical damage .(Make a replacement if any)
4.Check processor vcore voltage ( schema apply ) INDUCTACE ( R36 , R45 , R56 ) / capacitor ( 330uf – 220uF – Tokin nec super capacitor ) range 1.0VS~1.5VS to normal operate.
Example Vccore IC:ADP3166 ADP3170 ADP3421 AIC1567 CS5322 FAN5056 ITC1709 MAX1710/MAX1711/MAXl712 HIP6004 , ADP3212’MAX8760 , MAX8770 , MAX8771 , ISL6260 , ISL6265A , ISL6266A , ISL62882 , ISL6262A,ISL6218CV – T , ISL6269CCR .. etc
STEP 2
Check all memory and power voltage conductors and ground socket interface memory Vccram normal operational voltage 1.8 V and 0.9VTT for (DDRII) and 1.5V/0,9VTT for (DDR3)
Read also:How To Check 3v_5v Regulator On Motherboard
Examples of memory / power SODIM ( schema languages : VDDR / POWER MEMORY / VTERM / DDR PWR ) ic examples : (MAX8794 NCP5201 SC1486/SCl486A SC2616 TPS51020 ISL6520 ISL6537 CM8501 , ISL6224 ISL6225 , TPS51116EGR , RT8207A … etc ) .
STEP 3
Check voltage on S.I.O /EMBEDDED CONTROLLER chip. SIO managed alot of signal,starting from power button signal,switching VALW to VS power and stepping process signal sleep state.We can detected normal ic and firmware bios from confirmation signal of RSMRST#3.3V .If SPI setting ,IC bios and firmware not working ,this SIO will not work.
SIO chip samples are :WINBON/ENE/ITC/NOUVOTON/ PC97338 , PC87392 , FDC7N869 , FDC37N958 , LPC47N227 , LPC47N267 PC87591S / PC 87591L / PC 97317IBW/PC 87 393 VGJ PC87591E , WPC8768L , KB926D etc.
STEP 4
Check voltage and ground at the thermal sensor ic.Thermal sensors ( heat sensor ) is a sensor chip that detects heat safe limits to maintain security motherboar chips. almost all laptops have a thermal sensor to microprocesor and some motherboards have a thermal Graphic chip to chip .
Thermal sensor will give orders to the bios if it detects a maximum heat limit to disconnect power to the processor or vga or just turn off bootstrapping ( command to boot ) and stop the interface between components that aims to keep the excessive heat damage the chip.
Detect due to frequent excessive heat can cause thermal sensor or a faulty memory detection and sensor commands do not get along ( Fals alarm ) . Thus the chip detects heat tempratur maximum continuous conditions , although they are not.
If the sensor is already damaged and could not be reset we will have to replace the sensor chip that is still accurate .Ic examples :ADMI032 , EMC1402 , EMC4402 , EMC4401 , GMT781 , G768B , MAX6642 , MAX6657 , SMC1423 .. etc
STEP 5
Check voltage or frequency of the clock generator .Examples of clock generator chip :ALPRS355B MLF64PIN , CK505 , CK408 , K410M , CY2854LVXC , ICS9LPRS387 , ICS9LPR600, ICS951412 , ICS954213 , ICS9LPR363DGLF – T , ICS950810 , SLG8SP626 , SLG8SP513V , SLG8LP465VTR,SLG8SP553V , SLG8LP55VTR , SLG8SP513VTR … etc.
STEP 6
Check Chip power
STEP 7
Check chip signal and state trigger.
STEP 8
Check Bios microcontroller system(including check for S.I.O or embedded controler)
STEP9
Check SB(Southbridge)/NB(Northbridge) if faulty reflow and reball~replace the chip . ( Fixing ball lead / tin loose chip due to heat. Eamples of chips :SB/NB/ CHIP:PC97338 , PC87392 , FDC7N869 , FDC37N958 , LPC47N227 , LPC47N267 PC87591S / PC 87591L / PC 97317IBW/PC 87 393 VGJ PC87591E etc.
STEP 10
Check Graphics Chip: ATI , NVIDIA , S3 , NEOMAGIC , TRIDENT , SMI , INTEL , FW82807 , and CH7001A , etc. .
STEP 11
Check graphics power supply GPUCORE / GFXCORE / VCVOD / GRAPHIC POWER Examples:MAX8792ETD + T , MAX8792ETD , ISL6263 .. etc