Question about Philips 23PF9945-37 23" Flat Panel LCD Monitor

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Shorted Capacitor on LC 03 Scaler Board 3139 123 5680.4 v1 wk 319.5

Do you have a value for the surface mount component #5474 on the B side of this scaler board?

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Re: Shorted Capacitor on LC 03 Scaler Board 3139 123...

BEAD 100MHz at 120ohms

Part# 242254945333

Posted on Aug 20, 2008

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Monitor turns goes black and comes back on every 10 secs planar PX2210MW

The Planar PX2210MW is notorious for bad electrolytic capacitors. Specifically capacitor C804 on the power supply board. . This is a 1000uF 25volt capacitor. That capacitor was usually made by Hermei and it was purple. Normally, the top of a capacitor will be flat. When it fails, it will be curved upward and there may be some brown material leaking out.
If the monitor still will not work after replacing C804, the problem could be Q805 or Q806. These are located on the under side of the board. They are small black surface mounted chips. There are 8 pins on these chips. I have seen both AO4620 and APM4548A part numbers used. These chips contain a pair of MOSFET transistors. One transistor is n-channel and the other is p-channel. Look for a short in one of the transistors. I have repaired several of these monitors. C804 is always bad. How ever, in three cases, Q805 or Q806 was also bad 12c1ec2c-5a6d-4352-af31-150a0a92514c.jpg c9a53aae-2999-45c7-ad78-44ba51ac5a6c.jpg 795d93fe-9678-46c2-820a-767bea9babb0.jpg

Jul 25, 2013 | Planar PX2710MW Monitor

2 Answers

When you power on the monitor a loud buzzing noise is made and then the monitor shuts down

Hello, welcome to Fixya!

This sounds more or less like one or more bulged capacitors on the power supply board inside the monitor. Usually, excess power is what affects these capacitor most of the time.

Unplug the monitor from the wall, get a screw driver, open the monitor back cover in order to gain access to the panel/board. Look for any visible bulged capacitor. If you don't find any, use a ohm meter and continuity tester to read the capacitor and other component on the panel so that the fault can be detected.

If you find any faulty capacitor or other component, use a soldering iron to remove the faulty component, take it to any electronics parts store or visit

Get the exact value of the defective component and solder it back. Power should be restored after doing do.

If the above task too technical for you, ask a family or friend who has the ability to assist you. (Two good heads are better that one)....

If you are still having any difficulty, please let me know and I will respond to you.

I wish you good luck.


Nov 03, 2011 | Acer X233H 23" Monitor

1 Answer

I have a hpl1706 monitor,it has a problem of starting,when i switch it on the power led starts blinking all the time but the monitor does not does not start at all,i am little good at repair work so i was...

there are 3 capacitor in the power supply section on the circuit board, you will have to change all 3 capacitors the value of the 3 capacitor are 1000uf/10v and all 3 are soldered at one location, you need not search for those capacitors, if you see the component side of the board you will find those 3 capacitors either difused or burnt out.

Sep 06, 2011 | HP L1706 17" LCD Monitor

1 Answer

The power supply blew a capacitor and a surface mount fuse for the 5 volt to the video board. After replacing all the capacitors on the power supply board and the fuse, the LCD will come on with mostly...

Soory for the bad news but the problem is in the T-CON board (where the surface mounted fuse is blown, which means that it had shorted out components somewhere).
Not much you can do but replacing the LCD panel since the T-CON board is intergrated with the LCD panel.
Switched +5VDC at the T-CON board is steady with no AC ripple?

Basic LCD monitor and TV troubleshooting guide:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Dec 16, 2010 | ViewSonic VX2235wm LCD Monitor

1 Answer

My Samsung 2493hm monitor quit working after a power surge. The power light flashes slowly but nothing else happens. Can it be repaired at a reasonable price?

Dear showmetoo99,

Surely favicon.icofavicon.icowiki-favicon-sharpened.pngoneriot-favicon.icoyou can fix it yourself with a very low cost.

I will explain how to:

  • Open the case of the LCD
basically in all LCD monitors have two circuit boards (power supply board and system board)
  • After you open you will see the two boards are

  • You see a board that has a socket for the power source. wrote that the board we're looking for (power supply board)
  • Remove all cables connected to the board and take out the board. (get noted before you unplug it)
  • Now you see it components on board, we looking for capacitor.(see picture below)

  • Looking for damaged capacitors, physically you will see a capacitor on the top like a bloated (see picture below)
  • Replace the damaged capacitor with the same value that you can see on the surface of the capacitor. (In this step you need any soldering tool)
My advice: replace capacitors with higher voltage, like 10V replace with 16V or 25V will be fine.

Feb 02, 2010 | Samsung Computer Monitors

1 Answer

1/8 inch wide vertical streak on dell lcd monitor grey-green

There are loosed contacts between scaler board and flex-cables, at least those where you have color lines. These cables are glued with anisotropic compound and not such easy to fix, to make it right you shall heat junctions to certain temperature and press the cable down to surface with certain pressure, which is specified for compound used in there - consider as unknown.
The easiest way to get rid of these lines is to press flex-cables with something like piece of foam rubber.
Disconnect all cables coming from the display to boards, take the chassis off, unscrew metal cover from back side of display to get access to the scaler. Now, if you can, connect display back to boards (you may need to take boards off the chassis) and turn on the monitor. This will help you to find exactly loosed spot. Gently pressing to junctions of flex-cable to scaler PCB with finger observe the behavior of color lines on the display. Then put there thin piece of foam and fix with metal cover. That will work for awhile.

Sep 12, 2009 | Dell E173FP 17" LCD Flat Panel Monitor

1 Answer

Viewsonic VP211b No Power

I have fixed several of these.
The most common fail on the Viewsonic VP211b is a blown fuse on the inverter board. Check fuses F1 and F2. These are Fast Blow 2.0 Amp surface mounted fuses, case style 1208. Available at Newark Electronics, part number 64R8010. They are located on either side of connector CN1.


Jan 15, 2009 | ViewSonic VP211b 21.3" LCD Monitor

1 Answer

Flat screen monitor has gone black

You can test capacitors with an ohmmeter. A good capacitor behaves like a short circuit when you first apply a voltage, then its resistance increases as it charges. The capacitors that fail are electrolytic types with polarity, so be sure to put the meter ground lead on the capacitor negative. The cap will be marked. An open capacitor will show no kick in the reading, and a shorted cap will show a constant low resistance.

Now, having said all that, ohming a capacitor isn't 100% effective as a test. A capacitor's value may change to the point where a circuit will stop working, but if the cap isn't shorted or completely open, or is just a very low value, the ohmmeter test won't show a problem. A capacitance tester is better. Many digital meters include a capacitance test function.

Most inverter circuits have only a small number of capacitors, and it's usually faster just to change them all. If you replace a capacitor, keep the capacitance the same (the microfarad value) but use a little higher voltage rating. Caps come in standard voltage values, and they get physically larger as the rating increases, but if you just go up one level the new part will usually fit. The main reason these go bad is that the manufacturer used too low a voltage to begin with. It keeps costs down, but the parts are stressed and often can't deal with it.

Dec 06, 2008 | Mag Innovision 19" LCD Flat-Panel Monitor...

1 Answer

Dell monitor not working , green light blinks.

Capacitors look like cylinders mounted vertically on the pcb.

If you look at the printing on the board, there should be a label close to the capacitors such as C201, or XC330.

Usually a C in the label will indicate a capacitor.

They will be wrapped in a plastic jacket. The jacket will have writing on it, and usually a stripe down one side. The stripe indicates the negative lead (each cap will have two leads, negative and positive).
If the cap has a rounded top (domed) instead of a flat top, it is likely bad. You may even see that the component has split at the top, into four pie shaped wedges. This is also an indication of a bad cap. Lastly, the jacket is "heat shrunk" onto the metal cylinder. This usually causes the plastic jacket to overlap the top of the cylinder, which will show up as a donut shaped ring around the top of the cylinder. Some times if the cap is leaking, it will heat up causing the ring to shrink further so that the top of the cap will be completely exposed metal, with no plastic ring framing it. This also indicates a bad cap.

You can get the value from reading the print on the side of the cylinder. The values should be printed down the side of the cap, such as: 1000uF 16V, or 470uF 25V.

This is read as one thousand micro Farads at sixteen Volts, or four hundred seventy micro Farads at twenty five Volts (the u will actually be the Greek letter mu).

You will need a solder ****** to remove the solder from the caps on the solder side of the pcb (under $20), a soldering iron and some solder.

**** the solder after heating it with the iron, use the tip of the iron to carefully unbend the legs of the capacitors if needed.

Install the new caps making sure to observe the polarity. There will either be a mark in the board indicating where the negative lead should go, or a small + showing where the positive lead should go. Solder the leads and cut off the excess.

Make sure you get caps that are not larger physically than the originals or you may not be able to fit them into the same spot. (older capacitors are bigger than the same value newer capacitors).

Hopefully, you will only have three to six caps.

The lucky people will find only one bad cap, unlucky people will find up to ten bad caps, some in the power circuit, some in the inverter circuit, and some on the main board.

Caps on the main board can be very tough to remove. I recommend adding some solder to the legs of the caps you are going to remove, then heat one leg as you push the cap to the side to try and pull that leg out of the solder hole. Then heat the other leg and try to pull the cap completely off the pcb. Once done, you can use the solder ****** to clean the old solder out of the holes. This may be necessary because the main board is multilayer and these layers can act as a heat sink, making the solder harder to melt and harder for your solder ****** to remove. It's slightly easier once the capacitor legs have been removed.

Also note. Some manufacturers will use slightly larger caps, and in order to mount them they will bend the legs and glue the cap to the board on its side.

Mar 27, 2008 | Dell E172FP 17" LCD Flat Panel Monitor

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