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Green light constantly blinking. No image on the monitor. Burnt spot on circuit board by the heat sink. Need schematic to identify resistor to get replacement

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Unfortunately, most consumer devices to not have freely available schematics. Plus, the chances of the resistor in question being the only faulty part is low, as something must have caused the resistor to be overpowered.

Posted on Mar 07, 2008

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Flashing green light on the circuit board. No power at all


I suggest it is the mother board or the power supply. Go to the Dell website on a friend's PC and download PDF manuals pertaining to your model. The battery may have enough power to light an LED.

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Green light flashing on circuit board


Is there any problem with it?? I think you may be referring to the LAN adapter's blinking green light, if if is blinking while the computer is on and an ethernet cable is plugged in it is perfectly normal... otherwise please elaborate on the problem.

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The monitor is turning off


check for "hot spots" around the monitor, a heat sink may have come off or the heat is making a crack in the pc board to expand and break contact with power suppl

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SIR... MY LG 700E MONITER START OFTER 20 MINUTS OF SWITCH ON... WHAT SHOULD I CHEACK IN CIRCUIT OF MONITER...??


This is fault within the main mother board, can be related to the power supply or the processor secttion but is sure a lowering of value in capacitors.
If you are able to open the monitor and use a Hair dryer, the spot will be identified immediately as a heating in sections of the power or the board will switch on the monitor and thus confirm the area which can be pinpointed with a closer heating.
replace the suspected capacitors with the correct value , insert into the PCB with the correct polarity.

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Dimension 3100 wont turns no power button light there is also an green light on motherboard cpu and power suplly fans working but wont bot up


Contact technical assistance.They will most likely ask you to send it back to repair.

This chart is where I got my conclusion.

Power Light

Problem Description

Suggested Resolution
Solid green
Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
A configuration error exists.
Check the diagnostic lights to see if the specific problem is identified.
Solid yellow
The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.
If the Dell Diagnostics is running, allow the testing to complete.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
Solid green and a beep code during POST
A problem was detected while the BIOS was executing.
See "Beep Codes" for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified.
Solid green power light and no beep code and no video during POST
The monitor or the graphics card may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified. See "Video and Monitor Problems" in your Owner's Manual.
Solid green power light and no beep code but the computer locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified. If the problem is not identified, contact Dell for technical assistance.

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1 Answer

System was up an running then, Then shut down


It sounds to me like it overheated and something burnt out, but I could be wrong. The main pieces in a desktop computer are: power supply, motherboard, cpu, ram, and video card (which is on the motherboard for lower end systems.)
Each one will need to be properly tested to find out which part(s) is(/are) failing, and the failing part(s) will need to be replaced.

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1 Answer

My pc doesn't work


i gotta know 1st what is ur system configuration..is all ur system is getting power on..is there any sound coming out of the system..
assuming that the bios has not been flashed in a wrong way & u r a professional..

before u proceed to complex checkups..check the mains power supply- the fuse/switch/wirings/power cords/other associate circuits..

probably itz either minor case of loose ram/improper ground/cmos battery..
or major case of faulty or defective smps/cpu/main board short/display adapter or card/monitor

..plz do check the following as in order:..

1) in power on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..

2) if u hv a graphics card, replace with a standby or onboard and see..

3) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..

4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

5) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..

6) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink Compound" (available in local electronics chip level spare market) between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it tightly in position..

7) the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or pwm switching regulator circuit..look for defective protector-transformer/resistance(esp 4.7k)/mosfet..

8) if itz not the smps, then it must b ur main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(esp above 1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)....

always better to seek advise from ur system admin/vendor....

Nov 12, 2009 | HP PC Desktops

2 Answers

My monitor has no display at all


very incomplete thread..i gotta know 1st what is ur system configuration..is all ur system is getting power on..is there any light on cabinet glowing (the power n hdd)..is there is power light coming on ur monitor..is there any sound coming out of the system..or the set is dead..??..

considering that the system gets on but u get no display and assuming that the bios has not been flashed in a wrong way..

probably itz either minor case of loose ram/improper ground/cmos battery..
or major case of faulty or defective smps/cpu/main board short/display adapter or card/monitor

..plz do check the following as in order:..

1) in power on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..

2) if u hv a graphics card, replace with a standby or onboard and see..

3) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..

4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

5) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..

6) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink Compound" (available in local electronics chip level spare market) between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it tightly in position..

7) the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or pwm switching regulator circuit..look for defective protector-transformer/resistance(esp 4.7k)/mosfet..

8) if itz not the smps, then it must b ur main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(esp above 1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)....

always better to seek advise from ur system admin/vendor....

Nov 12, 2009 | Dell Dimension 4600 PC Desktop

1 Answer

Need value of resistors R7A4 and R753 in a Gateway VX700 monitor. Chassis family V8705. Board bears the codes CT920A2600 and CT920A2600. The resistors are physically located around the high tension...


long time since i worked on one of those chassis but if i remember right there both 250k ohm 1/2 Watt carbon in series
but its more common for them to go open circuit if there burned you better check out the rest of the circuit around the LOPT stage

Feb 28, 2008 | PC Desktops

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