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Troubleshooting Some Common Faults in BIOS

Troubleshooting
Some Common Faults

              1. Single short Beep i.e.
acceptance Beep (System OK) But no display on monitor.
Sol:
1 Check the monitor is on.
2
Check the AC socket
3
Check the brightness & contrast of monitor.
4
Check the VGA connector/ Physical condition
5
If all these are ok than Replace the Monitor
              2. No display, No acceptance Beep
But System is Switching ON & there is continue long Beep
.
Sol:
1 this problem is related with RAM.
2
Clean the Memory module
3
Check the memory chip by Replace ok RAM
4
RAM‘s Clock not match with MP clock
5
If memory chip is ok than problem on M/B
6
Check the transistors related with memory chip
Does
it show accurate voltage or not
(3.3v
SDRAM, 2.5 DDRRAM)
7
If voltage is not proper replace the transistors’
              3. No display, No acceptance Beep
but System is Switching ON/OFF properly, NO continue long
Beep, But Monitor is
OK.
Sol:
1 Check the loose data & pwr cables connectors.
2
Check the 12V power connector of M/B
3
If problem is still processed then remove all the devices from the system
& check the display of M/B only
4.
IF now POST screen is display than devices
Conflict
with each others
5
IF POST Screen is not display than Check the   RAM
4. No
display, No acceptance Beep No long Beep, System is not Switching ON.
Sol:
1   Check the AC Socket & UPS also.
2
Check the loose power connector/cable (system cabinet)
3
Check the M/B power connector.
4
Check the SMPS (power supply).
5
Check the front panel LED header connector
Cables
6
Check the CMOS clear jumper (it may be on
Clear)
7
If all these are ok than check the display
With
M/B, RAM & mP
8
If system is not switching than M/B faulty
5.
System Restart again & again completing the POST.
Sol:
1 firstly Check the all cables, converter,                              
   
Expansion Cards it may be loose tighten them
2
Check the M/B power connector it may be loose
3
Check the actual fault i.e. H/W or S/W (CMOS)
4
SMPS may be bad or low watting
5
Remove the UPS & CVT from the system
&
check the actual faults1
6
Check the RAM by replace healthy RAM& mp
7
Check the jumper setting on M/B/Over clocking
8
mP heat sink may be jam, lubricate the fan
9
If all these are ok & problem is still processed
Than
M/B faulty
6.
System Restart suddenly running time
Sol:
1 Check the loose power connector/ AC Socket.
2
Check the loose power connector of devices
3
The UPS & CVT also create the problem
4
The heavy load like air conditioner heavy
Motors
should be on the separate line then
The
computer power line
5
The SMPS may be bad
Note:
In the case of dust system also restart& hang
Or
dust may also decrease the
Performance
of system (speed)
             7. System Hang up /Halted
Sol:
1 Check the actual fault i.e. H/W or S/W (CMOS)
2  
Check the CPU Fan it may be bad
3   
Remove the dust & dirt
4   
Check the all cables, converter, Expansion
.   
Cards it may be loose, tighten them
5     
Check the external peripheral that can be
Connected
to a system
6   
Check the jumper setting on M/B
7    
If all these are ok than remove all the devices
I.e.
HDD, Optical Drives etc & Check
M/B,
RAM & mp display
          8               If
system hang in CMOS than Replace the
RAM
Motherboard
Testing (Debug Card)
Code
OK     Memory
Error            
      mp Error
00
          
C0                          
BC
FF   
       
C1                          
EA
7F           
C2
2F           
C3
26           
D0
27           
D1+continue long Beep
28etc      
D2
D3
60
POST
Fault
                1.K/B Error/ NO Keyboard
present
Sol:
1 Check the loose cable connector
2
Cable may be bad (Keyboard)
3
K/B itself may be bad
4
Check the physical condition of K/B connector
on
M/B
5
If all these are ok & problem is still processed
than
replace the keyboard port
2.Floppy
disk drive Fail
Sol:
1 Loose data & power connector of FDD
2  
Data cable may be bad (FDD_
3  
Load the CMOS defaults
4   
Floppy disk drive itself may be bad
5   
Check the physical condition of FDD ports
on
M/B
                 3.CMOS Checksum error
Sol: 
1 CMOS battery has gone bad replace it.(weak)
2
Check the CMOS jumper it may set on clear
3
If all these are ok than check the CMOS battery  rack it may be bad
4.Invalid
System Disk, Insert System Disk & Press enter when ready
OR
Disk Boot failure, Insert System Disk & Press enter when ready
OR
Disk I/O errors
Sol:
1 Hard Disk check in POST Detected or not
2
If not Detected Check the power & data cable
3
Data connector may be bad on HDD
4
Check the Master/Slave jumper setting.
5
Also check BIOS setting (device may be
Disable)
6
Check the root directory (C 🙂 it may be
                 5.Computer gives message: Your
computer has a serious problem Back up your data& replace
Your
HDD as soon as possible
Sol: 
you have must enable your SMART
Option
in CMOS, this option check the
Bad
sectors on HDD
Follow
the error message & back up your
Data
on to another drive, if you’re HDD has
Under
warranty, than replace If not than fix
The
bad sectors with NDD
                Your POST screen some times
Hangs up
                 Sol: 1 Check the power
connector of devices
It
may loose
2.
Data cables also may be bad
3
Remove all the Pwr & Data cables from
Devices
4.
Go to the CMOS setting if system not hangs
Now
than devices create problems
On
POST Primary master show none
Secondary
master show none
Sol 
.it means devices are not detected
Check
the power connector &data cable it may
Loose
or bad
2
Check the jumper setting (Master, Slave)
        3            Check
CMOS Setting
        4             If
problem is still processed than Check the IDE
               Port on M/B it may bad. Replace
the IDE port
Motherboard
faults
        System/ Motherboard is giving the
display but restart again &again after completing  
          
thePOST                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Sol:
1 first of all visualizes the M/B carefully. There can be some burnt or damage
track            
        components
2
check the electrolytic capacitor it can be damage
3
checks the crystal oscillator mounting near the clock generation chip replace
it
4
The clock generation chip may be bad
5
Bad BIOS
6
Reinsert the BIOS
7 Press
the north bridge and the south bridge chipset    with a great
force with the help of your thumb.
.
                M/B is dead no display on
monitor and the DEBUG card is giving 00; FF; 88 codes             
                but it is switching on
properly.
Sol:
1 First of all checks the physical condition of M/B i.e. burnt or worm out
tracks on the M/B.
2.
BIOS may be bad or incorrectly flashed
3.
check the electrolytic capacitor if found
bad                   
      replace it.
4.
While replacing the electrolytic capacitor you should take care for 1. The
volume or WVC work voltage and capacitance should be same 2. Capacitor size
should be same 3. Polarity should be correct otherwise it will blast after some
time.
4
bad BIOS replace the BIOS with the same
5
super I/O chip may be bad replace it.
6
check the voltage regulator i; e MOSFETS
replace            if
found bad
                M/B is dead no display on
monitor & the DEBUG card is             
                giving      
C0;C1;C2;C3;D0;D1;D2;D3etc. it is switching on properly also the  
                internal speaker is giving the
continuous long beep.
Sol:
check some burn or worn out track near the RAM slots and Mp sockets
2 :
check the operating voltage i;e 3.3 V for SDRAM and 2.5V for DDRSDRAM into the
RAM slot.
If
this voltage is absent then replace the voltage
Regulator
[MOSFETS]
3
clean the RAM slot with acetone .it may be dirty or corrosive camp
M/B
is dead and is not switching on.
Sol:
1 check the physical condition of M/B i.e. tracks
2
the super I/O chip may be bad. Replace it.
3
south bridge chips may be bad.
4
some times the M/B inner layers may be damage so in this condition the M/B
cannot repair further.
                The M/B is switching ON/OFF
properly & is giving the display but it hanghalt after completing the
POST or after 10-15 minutes.
Sol:
1 check the physical condition i;e tracks & Open
Burnt
capacitor
2
check the M/B’s power connector .it may be
Dry
solder or spark.
3
check the electrolyte capacitor
4
Also check the voltage regulator i;e MOSFETS
5
Some time the BIOS may be or incorrectly
Flashed
so reflash or replace it
                 M/B is giving the display but
the K/B is not working and during POST the following                      
                 message is display.
“Key
board error”
Or
“No
key board present”
1
The K/B connector may be dry solder
2
Some time there is some burnt track or
component
near the K/B connector
3
if still problem proceed than bad super I/O chip
              The M/B is giving the display but
parallel port is not working
Sol:
1 Check the resistor network mountings near the
parallel
port
2       Check
the track from parallel port to super I/O chip
3      Dry
soldered or bad parallel port
4      Some
time the super I/O chip may bad
5      Replace
the super I/O Chip
        The M/B giving the displays but one of
the serial port is not working
Sol:
1 serial port may be dry solder
2
check the track from serial port to GD75232
chip
and from GD75232 to Super I/O chip

GD 75232 chip may be bad
4
some time super I/O chip may be bad
Ø                        M/B is giving the display
but FDD connector is not working
Sol:
1 dry solders FDD connector
2
Bad floppy drive connector
3
visualize the physical condition of connector
and
tracks between the FDD Connector and
super
I/O chip
4
the super I/O chip may be bad
           The M/B is giving the display but
not audio out put
Working
Sol:
1 check the audio controller is not disable trey
 jumpers on M/B some times
The
audio controller is disabling through
BIOS
so first of all check these setting
2
If these are ok then check the crystal
Oscillators
and voltage regulator IC
LM
78xx; LM 317; LM 334mounted near the
audio
controller chip
3
Bad BIOS so either replace it or refresh it
4
The audio controller may also be bad.

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