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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.

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  • Anonymous Dec 28, 2008

    power cuts in and out. Cords are all good

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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

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I have a 65' Mitsubishi projecton TV Model WS-55859. It will not "start" ie: no sound or picture. I hit the reset button and the green light flashes for about 1 minute. I then wait about 1...


Dean,
Most of the shut down problems with this model series are caused by the convergence IC's failing
causing one or more of the 5 amp micro fuses to open. These are located on the power supply board centered in the middle of the chassi. These micro fuses are small green componets, and kind of look like resisters. there are usuallly 5 of these and they are located left of the transformer. to check them, unplug the AC power to the set. Use a ohm meter and they will read open if they are bad. As far as the convergence IC's, they are mounted on the big heat sink also on the power supply board. You will need to remove the power supply board to replace these. Be careful to remove all the screws in the center of the board, around the edges, and on the back of the heat-sink. The IC numbers will either be STK392-540, or STK 393-110. Use extra care when unsoldering the old IC's to make sure you do not damage the solder pads. I do recommend heat sink compound being used on the back of the IC's to prevent premature failure. Radio Shack should carry some.
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I'm having serious issues with my Dell Dimension 9200 desktop. I left my computer on overnight and during the night I had a 5 minute power failure. Now when I try to turn the computer on, it does not boot...


though itz not known to me if u r using an ups or invertor or cvt..
is any light blinks up..??..esp. on the monitor or set dead..

DO IT ONLY IF U R A PROFESSIONAL..
however..plz do check the following as in order:..
the Hardware part:..
1) check mains/power supply..the fuse, switch, wiring n associated circuitry..

2) [in case of desktop] 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)..
check the battery n adapter [main power], in case of laptops..
replace with a standby n see..

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

4) open the cpu n see if heat is generated..if not..replace the cpu n see..

5) 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..

6) on main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(espabove1000mfd)/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)..
replace with a standby n see..

7)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..

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

plz give priority to steps(2, 4 & 6)..

if u r not a professional, always better to seek advise from ur system admin/vendor....

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1 Answer

When powering up the system the power light comes on the HDD led comes on and then the system shuts off, tested battery, reseated RAM and tested using a known good HD. N/C


humm..if itz not the battery or hdd..i guess itz probably the system board..this is a typical insufficient Wattage/Oscillation/Frquency generation problem, in most of the cases..

DO IT ONLY IF U R A PROFESSIONAL..
however..plz do check the following as in order:..
the Hardware part:..
1) check mains/power supply..the fuse, switch, wiring n associated circuitry..

2) [in case of desktop] 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)..
retest the battery n adapter [main power], in case of laptops..
replace with a standby n see..

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

4) open the cpu n see if heat is generated..if not..replace the cpu n see..

5) 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..

6) on main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(esp above1000mfd)/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)..
replace with a standby n see..

7)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..

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

plz give priority to steps(2, 4 & 6)..

if u r not a professional, always better to seek advise from ur system admin/vendor....

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2 Answers

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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....

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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
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1 Answer

Only standby red light comes on. power button or


There is a failure on one of the circuit boards, and or the power supply itself. The main uPC, or the power supply controller is putting the main power supply in to protect mode.

You would have to send the set for factory service to resolve this issue.

Jerry G.

Oct 10, 2009 | iLO 3200 32 in. LCD Television

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.

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