HOW TO CHECK NO DISPLAY PROBLEM ON CIRCUIT

 PROCEDURE :

1a.Take of  all non onboard device : processor , memory / SODIM , bloutooht , webcam , modem , wifi , card reader etc.
1b.processor/SODIM  tested , SWITCH on again .
1c. physical analysis components : memory sockets loose , component crashes , burns , cracked , broken or any form of physical damage .(Make a replacement if any)
1d.check procesor  vccore voltage ( schema apply ) INDUCTACE   ( R36 , R45 , R56 ) / capacitor ( 330uf - 220uF - Tokin nec super capacitor ) range 1.0VS~1.5VS to normal operate.
example ic / chip For cpu power is : ( VCCORE / CORE CPU / CPU DC / POWER processors )
 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 )

1e : check for 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)

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 ) .

1f.cek voltage on S.I.O /EMBEDDED CONTROLLER chip
S.I.O managed alot of signal,start from pwr button signal,switching VALW to VS power and steping proces 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 S.I.O will not working.
This S.I.O programe by microcontroler .(download example S.I.O datasheet to get more information)
S.I.O 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 ) .

1.g.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 ( protect error ) .

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.

To reconcile the sensor detection is by lifting the chip from the motherboard and put back to give the induction . 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

1.h.cek voltage or frequency of the clock generator .

sample clock generator chip :
ALPRS355B MLF64PIN , CK505 , CK408 , K410M , CY2854LVXC , ICS9LPRS387 , ICS9LPR600
ICS951412 , ICS954213 , ICS9LPR363DGLF - T , ICS950810 , SLG8SP626 , SLG8SP513V , SLG8LP465VTR,SLG8SP553V , SLG8LP55VTR , SLG8SP513VTR ... etc.

2.a.Check Chip power
2.b.Check chip signal and state trigger.2.c.Check Bios microcontroller system(including check for S.I.O or embedded controler)
2.d.SB/NB/Chip analyses .
2.e Reflow~reball~replace the chip . ( Fixing ball lead / tin loose chip due to heat )


note : Chip -level is not described in detail on the basis of the material .
sample chips :
SB/NB/ CHIP : - ( PC97338 , PC87392 , FDC7N869 , FDC37N958 , LPC47N227 , LPC47N267 PC87591S / PC 87591L / PC 97317IBW/PC 87 393 VGJ PC87591E etc. ) .

- Graphics Brand : - ( ATI , NVIDIA , S3 , NEOMAGIC , TRIDENT , SMI , INTEL , FW82807 , and CH7001A , etc. .

GPUCORE / GFXCORE / VCVOD / GRAPHIC POWER

MAX8792ETD + T , MAX8792ETD , ISL6263 .. etc