Question about Computer Monitors

1 Answer

Lcd montior failure

Standby light comes on then cuts out. i removed the board that connects power and noticed charring underneath a heat sink with a 5 pin connector to the board. have tested with a circuit tester and get nothing from the pins. can i get a replacement or would you advise a new board.

Posted by on

  • Anonymous Dec 28, 2008

    power cuts in and out. Cords are all good

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 198 Answers

Standby light comes on then cuts out. i removed the board that connects power and noticed charring underneath a heat sink with a 5 pin connector to the board. have tested with a circuit tester and get nothing from the pins. can i get a replacement or would you advise a new board

Posted on Feb 20, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Monitor will not power up. was working fine last night, and now is not working at all. Just black screen.


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 & u r a professional..

however, 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 | LG Flatron 775FT 17" CRT Monitor

1 Answer

How to disable the resolution notice on VG930m


Use your monitor buttons to look for Resolution Notice and turn it off.

To disable the notice on ViewSonic 23" LCD Monitor , use the buttons on the
front of the montior to do the following:
* Press #1 button
* Use down arrow to highlight Setup Menu and press #2 button
* Use down arrow to highlight Resolution notice and press #2 button
* Select Disable and exit!!

To disable the notice on NEC LCD 1765 monitor
* Press button #5 on the monitor
* Scroll up and down the menu list with Montior Button #4 and then select
with Monitor Button #5. Go to "Advanced menu" set the Resolution notice to
OFF.

Nov 02, 2009 | ViewSonic Computer Monitors

1 Answer

Monitor Issue: 5 seconds of picture the monitor goes black.


I had this similar problem. I found out that there was a bad 1000uf, 16V cap on the power supply board. The cap is too close to a heat sink and over heated. I bought the cap at radio shack for $2, installed it so that it is far away from the heat sink. Monitor now stays on when powered up.

These monitors are difficult to open.

After removing the stand, you need to insert a flat screw driver at the bottom of the screen where two slots are located. Then work the screw driver around until the two plastic pieces are separated. Remove the cover plate and unscrew the push buttons. Unplug the monitor cords from the driver board. Unscrew the mounting screws from the power supply board and remove. You will need to pinch the plastic support in the middle of the board to remove. Unsolder the cap. It is located near a copper heat sink and the value will be on the cap. It will be buldged up on the top. You will see burn marks on the board surrounding the cap. Install the new cap and solder. Be careful not to solder across joints.

Reassemble and turn on. Should solve the problem

Dec 16, 2008 | Computer Monitors

1 Answer

Montior will not come on


internal board on the lcd has blown capacitors you will need to replace those on the power board to bring the monitor back up.

Nov 22, 2008 | Star Logic 17" LCD Monitor

3 Answers

Flat screen wont turn on


If your screen has been damaged, you have to replace the lcd screen.

Oct 03, 2008 | Dell E173FP 17" LCD Monitor

2 Answers

Monitor will not turn on


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}Cause of power goingoff: There is a bad 1000uF, 16V capon the power supply board.

Solution: Replace cap. Radio Shack sells a 1000uF, 35Vcap for $2. This will work.

Why did the cap gobad? The cap is too close to a heatsink and over heated.

What does this capdo? This cap sends a signal to an ICwhich keeps the monitor 'on' after the power switch is pushed. When the cap is weak, AC ripple voltage isapplied to the IC and it sends a signal to shut the monitor off.

Opening the Monitor:These monitors are difficult to open.

The two plastic pieces snap together and must be pried apartwith a flat screw driver.

After removing the stand, you need to insert a flat screwdriver at the bottom of the screen where two slots are located. Then work the screwdriver around until the two plastic pieces are separated.

Remove the cover plate and unscrew the push button circuitboard.

Unplug the monitor cords from the driver board and removethe screen.

Unscrew the mounting screws from the power supply board andremove.

You will need to pinch the plastic support in the middle ofthe board to remove.

Cap Replacement:

Cap is located near a copper heat sink and the value will beon the side of the cap. It will be bulged up on the top. You will see burnmarks on the board surrounding the cap. Unsolder the cap.

Install the new cap and solder. Make sure you connect + ofthe cap to + marked on the board.

Be careful not to solder across joints.

Keep leads long so you can bend the cap as far away from theheat sink as possible.

Reassemble monitor and turn on.

This should solve the problem.

Sep 06, 2008 | Dell E173FP 17" LCD Monitor

2 Answers

Xenon LCD monitor will not turn on..


time for a replacement with the amount of data supllied, also see if the light indicator button comes on, if there is power, then check the video plug and card, do another video card and see if that corrects the problem.

Jun 21, 2008 | Dell E173FP 17" LCD Monitor

1 Answer

Samsung 192N suspect power supply problem


I'm sure it is power board failure that need repiar or replaced the defectieve parts of your LCD .

Apr 18, 2008 | Samsung Syncmaster 192N 19" LCD Monitor

1 Answer

15in dell monitor model e151fpb


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Cause of power going off: There is a bad 1000uF, 16V cap on the power supply board.

Solution: Replace cap. Radio Shack sells a 1000uF, 35V cap for $2. This will work.

Why did the cap go bad? The cap is too close to a heat sink and over heated.

What does this cap do? This cap sends a signal to an IC which keeps the monitor 'on' after the power switch is pushed. When the cap is weak, AC ripple voltage is applied to the IC and it sends a signal to shut the monitor off.

Opening the Monitor: These monitors are difficult to open.

The two plastic pieces snap together and must be pried apart with a flat screw driver.

After removing the stand, you need to insert a flat screw driver at the bottom of the screen where two slots are located. Then work the screw driver around until the two plastic pieces are separated.

Remove the cover plate and unscrew the push button circuit board.

Unplug the monitor cords from the driver board and remove the screen.

Unscrew the mounting screws from the power supply board and remove.

You will need to pinch the plastic support in the middle of the board to remove.

Cap Replacement:

Cap is located near a copper heat sink and the value will be on the side of the cap. It will be bulged up on the top. You will see burn marks on the board surrounding the cap. Unsolder the cap.

Install the new cap and solder. Make sure you connect + of the cap to + marked on the board.

Be careful not to solder across joints.

Keep leads long so you can bend the cap as far away from the heat sink as possible.

Reassemble monitor and turn on.

This should solve the problem.

Dec 07, 2007 | Dell E173FP 17" LCD Monitor

2 Answers

No display


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Cause of power going off: There is a bad 1000uF, 16V cap on the power supply board.

Solution: Replace cap. Radio Shack sells a 1000uF, 35V cap for $2. This will work.

Why did the cap go bad? The cap is too close to a heat sink and over heated.

What does this cap do? This cap sends a signal to an IC which keeps the monitor 'on' after the power switch is pushed. When the cap is weak, AC ripple voltage is applied to the IC and it sends a signal to shut the monitor off.

Opening the Monitor: These monitors are difficult to open.

The two plastic pieces snap together and must be pried apart with a flat screw driver.

After removing the stand, you need to insert a flat screw driver at the bottom of the screen where two slots are located. Then work the screw driver around until the two plastic pieces are separated.

Remove the cover plate and unscrew the push button circuit board.

Unplug the monitor cords from the driver board and remove the screen.

Unscrew the mounting screws from the power supply board and remove.

You will need to pinch the plastic support in the middle of the board to remove.

Cap Replacement:

Cap is located near a copper heat sink and the value will be on the side of the cap. It will be bulged up on the top. You will see burn marks on the board surrounding the cap. Unsolder the cap.

Install the new cap and solder. Make sure you connect + of the cap to + marked on the board.

Be careful not to solder across joints.

Keep leads long so you can bend the cap as far away from the heat sink as possible.

Reassemble monitor and turn on.

This should solve the problem.

Mar 18, 2006 | Neovo E-19A 19" LCD Monitor

Not finding what you are looking for?
Computer Monitors Logo

Related Topics:

492 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computer Monitors Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18297 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Computer Monitor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...