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" No Display " Problem
Lets Discuss about no display problem as this type of problem is very basic and you will come across of this problem very frequently .before proceeding we will first know what is the basic hardware required to get the display on a monitor.
Basic hardware required to get the display
1) SMPS
2) Motherboard
3) Processor with heat sink
4) Memory
5) Display card (optional)
first ,focus on to these above mentioned hardware to segregate the problem
Now , we need to troubleshoot each and every piece of hardware in details .First we will segregate the problem between Pc and monitor .when you start the system then Pc Starts and check Three LED Num lock, Caps Lock ,and Scroll Lock Of key board Glows for a while and After that if you press num Lock it should be ON and OFF that mens SMPS , Memory ,Motherboard and processor is Ok and then it,s a problem with monitor not with the system .
Testing the Monitor
Most monitor have a built -in POST .This enables you to check that the monitor is working properly and and to check if the monitor is receiving input from the system .You must use the POST check that the monitor is working properly ,especially when you get a new monitor for the system
The POST Also display a message such as sync OUT of Range if the Monitor cannot handle the Resolution or frequency sent by the video adapter .This message also appears if the signal Cable is damaged
( Use of POST to check if the Monitor is Working )
check that the monitor power cord is connected to the power supply.
1) check if the signal cable is connected to the system .if connected , Disconnect it.
2) Switch the power supply on '
3) switch the monitor on A message will appear on the display screen to show that the monitor is working but not reeving signals from the system
Note :- The message mentioned in step3 does not appear in every monitor.
4) Switch the monitor and the power supply off,
5) Reconnect the signal cable to the system
Troubleshooting SMPS
1) check the AC line
2) check the power cord and Line Voltage selector switch whether it has been set to 230 VAC
3) Remove all daughter cards, FDD,HDD and supply connector and check the PG signal (+5 VDC Gray).
4) port pin No . 14 & 15 as show in image to see that fan is rotating and then check the O/P voltage by DMM.
5) if the SMPS does not work when connected to motherboard then check whether there is a problem with SMPS
ATX Power Connector
This is a 20 pin connector with 6 type of voltage coming out of it . ATX styel power connector for the ATX/NLX power supply .ATX/NLX from factors use the ATX style power connectors .This style has a single 20-pin connector Show the ATX style powers connector .The color on the pin denotes the color of the wires and given the respective voltages .
Troubleshooting Memory ...
1) Clean the Memory With the help of eraser and clean the slot and then place the memory properly and check whether you are getting the display or not
2) if there is no display , then change the slot
3) Swap the memory with another working memory (ether you can carry a memory modul or take it frome another working Pc but the specification should be same )
Replacing the memory
There are two basic type of memory currently used : DDR2 and DDR3 is still available. but unlike to be installed in any currently sold PCs .Beyond the type of memory,each memory type also has a related speed to that RAM as well. Below is a chart detailing the order of the type and speed in order of slowest to fastest :
* DDR2 400 MHz or PC2-3200
* DDR2 533 MHz or PC2-4200
* DDR2 667 MHz or PC2-5300/PC-5400
* DDR3 800 MHz or PC3-6400
* DDR2 800 MHz or PC2-6400
* DDR3 1066 MHz or PC3-8500
* DDR3 1333 MHz or PC3-10600/PC3-10666
* DDR 3 1600 MHz or PC3-12800
These speeds are all relative to the theoretical bandwidths of each type of memory at its given clock speed when compared to another .A computer system will only be able to use on type (DDR2 or DDR3) of Memory and this should only be used as a comparision when the CPU is identical between the two system ..
Troubleshooting Motherboad
1) check the CMOS battery voltage for3 volt : if this is less ,you may not get the display
2) Check motherboard for on Account of overheating of equipment
3) check it processor is getting core voltage .put your finger On top Of the processor so that you can understand wheter processor is getting voltage or not.if it is over heated then processor or power section problem..
4) Check VCC on mother board for V core voltage
5) Update Bios from motherboard driver CD or you can download from the internet.
6) check North Bride and south Bridge ICs physically for loose connection or dry soldering .
7) Replace BIOS and Check.
8) Physically observe any scratches or discontinuity in PCB path
9) Check for burnt ICs or components
10) check regulator ICs and MOSFETs
Checking CMOS Battery
Most computer will boot with a CMOS battery ,otherwise they wil lose their user settings within the CMOS ,in some case ,motherboards will not boot at all if the CMOS battery voltage is Low
1) Check CMOS battery Voltage with the help of multimeter ,and clear the Cmos
2) The nominal voltage for the CMOS battery is approximately 3.1 to 3.3 Volts .if the Voltage is Lower than 3 Volts then replce the CMOS Battery
3) Removing the CMOS battery can Also clear the CMOS setting .
Troubleshooting Processor
1) Remove the Processor and dab some thermal paste and place the Processor properly
2) swap the processor with another working processor. Processor should be of same specification
3) Remove the memory from the motherboard from the motherboard and check if you are able to get some beep sound and if you are not getting then the trouble might be on account of a faulty processor
Using PC Analyzer /Debugging Card
1) install Pc Analyzer card in a PCI slot
2) start the system
3) you will see hexadecimal code i.e error code on the LCD panel..
4) Refer To the manual that Comes with the PC Analyzer Card and get the Solution.
Thank You :)
Lets Discuss about no display problem as this type of problem is very basic and you will come across of this problem very frequently .before proceeding we will first know what is the basic hardware required to get the display on a monitor.
Basic hardware required to get the display
1) SMPS
2) Motherboard
3) Processor with heat sink
4) Memory
5) Display card (optional)
first ,focus on to these above mentioned hardware to segregate the problem
Now , we need to troubleshoot each and every piece of hardware in details .First we will segregate the problem between Pc and monitor .when you start the system then Pc Starts and check Three LED Num lock, Caps Lock ,and Scroll Lock Of key board Glows for a while and After that if you press num Lock it should be ON and OFF that mens SMPS , Memory ,Motherboard and processor is Ok and then it,s a problem with monitor not with the system .
Testing the Monitor
 |
| Testing monitor |
Most monitor have a built -in POST .This enables you to check that the monitor is working properly and and to check if the monitor is receiving input from the system .You must use the POST check that the monitor is working properly ,especially when you get a new monitor for the system
The POST Also display a message such as sync OUT of Range if the Monitor cannot handle the Resolution or frequency sent by the video adapter .This message also appears if the signal Cable is damaged
( Use of POST to check if the Monitor is Working )
check that the monitor power cord is connected to the power supply.
1) check if the signal cable is connected to the system .if connected , Disconnect it.
2) Switch the power supply on '
3) switch the monitor on A message will appear on the display screen to show that the monitor is working but not reeving signals from the system
Note :- The message mentioned in step3 does not appear in every monitor.
4) Switch the monitor and the power supply off,
5) Reconnect the signal cable to the system
Troubleshooting SMPS
 | |
| SMPS |
1) check the AC line
2) check the power cord and Line Voltage selector switch whether it has been set to 230 VAC
3) Remove all daughter cards, FDD,HDD and supply connector and check the PG signal (+5 VDC Gray).
4) port pin No . 14 & 15 as show in image to see that fan is rotating and then check the O/P voltage by DMM.
 |
| Check SMPS |
5) if the SMPS does not work when connected to motherboard then check whether there is a problem with SMPS
ATX Power Connector
 |
| ATX Power Connection |
This is a 20 pin connector with 6 type of voltage coming out of it . ATX styel power connector for the ATX/NLX power supply .ATX/NLX from factors use the ATX style power connectors .This style has a single 20-pin connector Show the ATX style powers connector .The color on the pin denotes the color of the wires and given the respective voltages .
 |
| ATX Color Coding |
Troubleshooting Memory ...
 |
| RAM |
1) Clean the Memory With the help of eraser and clean the slot and then place the memory properly and check whether you are getting the display or not
2) if there is no display , then change the slot
3) Swap the memory with another working memory (ether you can carry a memory modul or take it frome another working Pc but the specification should be same )
Replacing the memory
There are two basic type of memory currently used : DDR2 and DDR3 is still available. but unlike to be installed in any currently sold PCs .Beyond the type of memory,each memory type also has a related speed to that RAM as well. Below is a chart detailing the order of the type and speed in order of slowest to fastest :
* DDR2 400 MHz or PC2-3200
* DDR2 533 MHz or PC2-4200
* DDR2 667 MHz or PC2-5300/PC-5400
* DDR3 800 MHz or PC3-6400
* DDR2 800 MHz or PC2-6400
* DDR3 1066 MHz or PC3-8500
* DDR3 1333 MHz or PC3-10600/PC3-10666
* DDR 3 1600 MHz or PC3-12800
These speeds are all relative to the theoretical bandwidths of each type of memory at its given clock speed when compared to another .A computer system will only be able to use on type (DDR2 or DDR3) of Memory and this should only be used as a comparision when the CPU is identical between the two system ..
Troubleshooting Motherboad
 |
| Motherboard |
1) check the CMOS battery voltage for3 volt : if this is less ,you may not get the display
2) Check motherboard for on Account of overheating of equipment
3) check it processor is getting core voltage .put your finger On top Of the processor so that you can understand wheter processor is getting voltage or not.if it is over heated then processor or power section problem..
4) Check VCC on mother board for V core voltage
5) Update Bios from motherboard driver CD or you can download from the internet.
6) check North Bride and south Bridge ICs physically for loose connection or dry soldering .
7) Replace BIOS and Check.
8) Physically observe any scratches or discontinuity in PCB path
9) Check for burnt ICs or components
10) check regulator ICs and MOSFETs
Checking CMOS Battery
 |
| CMOS |
Most computer will boot with a CMOS battery ,otherwise they wil lose their user settings within the CMOS ,in some case ,motherboards will not boot at all if the CMOS battery voltage is Low
1) Check CMOS battery Voltage with the help of multimeter ,and clear the Cmos
2) The nominal voltage for the CMOS battery is approximately 3.1 to 3.3 Volts .if the Voltage is Lower than 3 Volts then replce the CMOS Battery
3) Removing the CMOS battery can Also clear the CMOS setting .
Troubleshooting Processor
 |
| Processor |
1) Remove the Processor and dab some thermal paste and place the Processor properly
2) swap the processor with another working processor. Processor should be of same specification
3) Remove the memory from the motherboard from the motherboard and check if you are able to get some beep sound and if you are not getting then the trouble might be on account of a faulty processor
Using PC Analyzer /Debugging Card
 |
| Analyzer Card |
1) install Pc Analyzer card in a PCI slot
2) start the system
3) you will see hexadecimal code i.e error code on the LCD panel..
4) Refer To the manual that Comes with the PC Analyzer Card and get the Solution.
Thank You :)
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