Model -HP 6465B No -Display Power On
Posted: Sat Sep 02, 2017 12:52 pm
Tips N Tricks no-3
Model -HP 6465B
PCB -6050A2395501-MB-A02
Problem Reported - POWER ON NO DISPLAY
PSU Readning - shows up the load of 0.23 amps and keep on restarting
OBSERVATION - TON MISSING AT VCORE IC
Laptop arrives in power on no display condition when connected to PSU it.. shows up the load of 0.23 amps and keep on restarting . Searched for schematic but unavailable , so start step by step checking, first checked for all VS supplied for availability and found ok but vcore is missing,
So searching same chipset for other schematic for cross reference with same vcore ic ..
Found that almost all requirements was available of vcore ic , like , VCC, VDD, VRON was available . but TON pin has no voltage the pin is connected to a resistor and when tested the resistor for value found it open
While the reference schematic says that it should be around 100k
Just changed the resistor and vcore started generating
As the board had no marking reference for resistor I have marked it in the pic.
Job done
Model -HP 6465B
PCB -6050A2395501-MB-A02
Problem Reported - POWER ON NO DISPLAY
PSU Readning - shows up the load of 0.23 amps and keep on restarting
OBSERVATION - TON MISSING AT VCORE IC
Laptop arrives in power on no display condition when connected to PSU it.. shows up the load of 0.23 amps and keep on restarting . Searched for schematic but unavailable , so start step by step checking, first checked for all VS supplied for availability and found ok but vcore is missing,
So searching same chipset for other schematic for cross reference with same vcore ic ..
Found that almost all requirements was available of vcore ic , like , VCC, VDD, VRON was available . but TON pin has no voltage the pin is connected to a resistor and when tested the resistor for value found it open
While the reference schematic says that it should be around 100k
Just changed the resistor and vcore started generating
As the board had no marking reference for resistor I have marked it in the pic.
Job done