Question about Samsung SyncMaster 793DF 17" CRT Monitor

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Monitor Problem When I push th power switch, the green light won't come on when switch on. No picture, no green light . Pin3 DP904C is 11 - 12v DC

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The power is for the monitor to work

Posted on Apr 05, 2009

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Its a power prblem
u need to change the internal power conector

Posted on Feb 14, 2009

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What causes the power brick green light on Dell's 2001fp lcd monitor to 'dim' when connected to the monitor & full brightness when disconnected?


It can be due to bad DC filter caps in the brick or the monitor has short circuits inside and drawing too muck current.
See picture of bad caps here: http://s807.photobucket.com/albums/yy352/budm/Bad%20capacitors/

http://en.wikipedia.org/wiki/Capacitor_plague

The power supply is rated at 20vdc 4.5amp. You can try loading it with 24v bulb rated at 40~50watts and see if it maintain 20vdc output, it should since it is regulated power supply.

Jul 09, 2010 | Dell UltraSharp 2001FP 20.1" LCD Monitor

1 Answer

The DELL E172FPb LCD Monitor (switch light flicks green)scr black


You need to open it up and inspect the componente inside, look at the fuse and the transistors in the inverter circuits first, also look for sign of over heating on the board, see pictures here for the guide: http://s807.photobucket.com/home/budm/allalbums

Mar 20, 2010 | Dell E173FP 17" LCD Monitor

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Samsung lcd monitor 153V has no display power indicator (green) is ok found 1 ic AE3U1T burnt. is this ic available or has the psu and backlight panel pcb to be changed.. dtgandhi@gmail.com


Samsung 153V LCD Monitor Power Supply Repair Tips


Troubleshooting Samsung 153V LCD power supply is just like troubleshooting those CRT type. This monitor came in with no power symptom. If you are first time repairing this type of power supply, I recommend you to first remove the switch mode power transformer. Then test every single component in the primary section, before you continue to check the secondary section.


You have to be good in testing basic electronic components in order to detect the fault. You can always browse through my website just in case you do not know how to test basic electronic components. If you do not know the right way to check, you might miss out a bad component and this will lead you not able to solve the problem. After carefully checking all the components in the power supply section, I found the filter capacitor do not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power IC TOP247F blown!.


Testing the SMPS (switch mode power supply) primary winding with a **** smith fly-back tester, shows green bar which indicates good winding. What we left here were the secondary diode and filter capacitor. Upon checking them with analog meter and ESR meter, found all of them to be good condition. Other area like main board and inverter board also looks okay (Power failure rarely affect these two circuit). Now we have confirmed that only five components found to be faulty.


One by one the components were replaced (except one fuse) and just before you switch on the power supply, make sure you connect a 100 watt light bulb across the live ac line. Once it is done you can then proceed to switch on the LCD monitor to look at the brightness of the bulb.

If it very bright, this suggests that there are still short circuit somewhere in the power section. If it dim or totally goes off, you can now place your red probe to the secondary side to check if any dc present at their respective line. If there are DC voltages present at the output, you can switch off the power, discharge the filter capacitor (for safety purposes), remove the light bulb and connect back the new fuse to its original location.


You are now hundred percent sure that the LCD power supply won

Mar 23, 2009 | Samsung SyncMaster 153V 15" Flat Panel LCD...

1 Answer

When power light is green I have no display on the screen


dwanlesso6, Please tell me brand of monitor and if it is LCD/FPD and size 15,17 19 etc. If it is an LCD then it is possible that the DC power supply and or inverter board has failed. Here is short PS101 lesson. All electronic things (Stereo, printer, radio, computer, TV,) all require DC voltage. You get AC Voltage from outlet on wall. the two don't mix. ever!! All the above mentioned things have AC to DC power conversion circuits. They are called power supplys. Only your's and everybody's LCD monitor has two. One makes DC for the monitor logic/digital kinds of stuff, 5.0volts and also makes a
second and higher voltage ( 12v or 15v or 24v) to send to the other power supply which is called an inverter power supply. The inverter PS changes DC into a higher frequency Square Wave AC voltage to power up the Fluorescent Tubes that make your display "bright white" !! Do you own any of those new style light bulbs. You know... the ones that look like small coiled fluorescent tubes and screw into the same socket that previously held the old filiament type of light bulb. Well your dealing with the same technology in your monitor. Just for kicks, you can go to www lcd-monitor-repair. com. Don't pay any attention to the 'advertisement' !!!! just look at the pics of what is inside an LCD/FPD.
The advert just wants you to buy books on LCD/FPD repair.. The best advice I can tell you is try to locate some repair shop that specializes in FPD troubleshooting&repair. Hell, I too am waiting for this 19in GatewayFPD to die. Hope is later.. not sooner, or I'll be in same boat w/LCD/FPD for anchor. Good luck. I'm lmistyrel @ aol north of Chicago been in electronics >3decades

Jan 12, 2009 | Westinghouse L2046NV Monitor

2 Answers

Monitor Problem


First check the power switch with a multimeter,if its correct then check the power supply part of the monitor circuit. If you are having any problem with that part change the FET with another.

Aug 27, 2008 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Dell LCD E207WFP (Switches on Briefly then goes Off)


two case trouble reason and need to do:
1) back light driver (inverter) works not stable and DC power protect. it near some component damage, should repair inverter by egineer.
2) back light (lamp) over life cycle so protect by the inverter, should change new lamp (regular parts)
3) DC power supply not stable or component over life( wave filter capacitor), should be replaced

Aug 03, 2008 | Dell E207WFP LCD Monitor

2 Answers

Monitor won't come on


Check the power cable of the monitor make sure everything is properly connected.

May 10, 2008 | Acer AL718 17" Flat Panel LCD Monitor

1 Answer

Power button flashing green on and off. No Picture


What type of monitor do you have? I need to no if the power supply or cord plugs directly into the LCD Monitor? These questions are important! Please answer these questions, I will be able to give you an answer!

Nov 25, 2007 | Acer AL1916W 19" LCD Monitor

1 Answer

Blank Screen..Will not power off


The flash light test only works with lcd monitor as they have back lights. Double check the connections again, also, if you can borrow a monitor try it on your pc, it may be your graphics driver needs to be uninstalled and re-installed, but you will need a monitor to see.

Dec 13, 2006 | Proview PS 776 Monitor

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