Question about Samsung SyncMaster 753S 17" CRT Monitor

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Power transistor having 4 legs no. begining with 7 DP

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It's DP704C STR

Posted on Nov 27, 2008

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The power button on my monitor flashes but will not trun on

There is a chance that you may have a couple bad capacitors on the power-inverter board but more than likely the problem will be a shorted out transistor. There are 4 on the inverter side of the board and one set may have gone bad. Capacitor problems may have caused the transistors to fail. Transistors are probably c5706 or c5707 and are black with 3 legs going though the board.
You would have to open it up to check and would need an ohm meter to verify if the transistors are shorted out.

Aug 18, 2010 | Dell 1703FPt 17" TFT LCD Flat Panel...

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Specification of part place in the heat sink of the acer al1716As lcd monitor power supply pcb,i cnnot recognized burnt already,is that IC or has 6 pin


Transistors are with just three pins, so what you are seeing there should be an ic and not a transistor.

It is ics that have numerous pins, transistor have just three legs(pnp) or (npn).

So what you see is an ic.

Take care.

May 04, 2010 | Acer AL1716As 17" LCD Monitor

1 Answer

Color problem

Hi, it is more likely from an open green and/or blue picture tube's electron gun transistor driver.
If you have an experience on electronics / or use of solder gun, you can just open your monitor and look for the electronic board at the back of the picture tube. Take a look in all transistor ( components with three legs) and solder / check if their legs are not fully soldered to the board. Note: just be careful on the high voltage diode / line ( the one with a thick (like the car distribution wire cable) single wire going to the tube). good luck

Dec 19, 2008 | IBM E74 17" CRT Monitor

1 Answer

Monitor on but no/very feint display

Sorry for the late reply, I was sent away for 2 weeks in the middle of nowhere.

Anyway to the problem at hand..

The transistors are easy to check. They have 3 legs so think of them as 1, 2 (middle) and 3
Using a multimeter on continuity mode (should give a tone when the probes are touched together) put one lead onto pin 1, and the other onto pin 2. You should get a tone for no more then a half a second at most. If you get a solid tone, it has shorted out.

Move the leads to the pins in various combinations to cover all possible connections if you get no tone from the first test. One short and it needs to be replaced.
When you replace the transistors in these, replace them as a pair. There are 2 transistors that work together at each end of the board. (4 all up)

I have done up a very long conversation with another on here, so just look through my posts and you will see it.

Jun 12, 2008 | BenQ FP767 17" LCD Monitor

1 Answer

C5707 on 17" LCD DELL Monitor E173fp

You really need to replace all 4 as well as the 2 FU9024 chips. The solder is also bad in the inverter area especially around the 4 transformer legs. Check here for Instruction videos as well as parts and repair kits for that model.

May 17, 2008 | Dell E173FP 17" LCD Monitor

1 Answer

F1703 LCD goes blank after 1-2 seconds

You are not looking for a problem in the inductors. There are 4 transistors (2 pairs) near the transformers where the CCFL's plug into the board. They short out and you end up with your problems.

The transistors have 3 legs and stick up out of the board. They will look fine visually, since they are shorted internally.

Hope that helps =)

Mar 11, 2008 | HP Pavilion F1703 17" LCD Monitor

6 Answers

BenQ FP731 17" LCD Monitor Problem

Connect it to another device, if you get the same result the backlight is bad! These can be replaced, but can be costly!

Nov 14, 2007 | BenQ FP731 17" LCD Monitor

6 Answers

Dell Blinking Power Light

Just wanted to say Thank You for the info on this site. I had the same problem as previously posted. When powered up, the monitor showed a fast flash of the desktop and then went black, with the power indicator flashing green. I read the posts, purchased the capacitors and the 4 - 2sc5707 transistors through ebay. I ordered them on the 6th and rec'd them today. I only had one bad capacitor and one transistor that checked bad, but I ordered 5 caps and 4 transistors. When ordering the caps be careful of the height of the caps. I found this to be a problem because I ordered the 50v, 105 degree Panasonic caps that didn't fit with the enclosure attached, so I used the 4 good caps removed previously and replaced the bad one with a 470uf, 50v. 85 degree cap from Rubycon I found among my spare parts. Installed the parts and the monitor is working properly (for the last two hours) so I'm happy for as long as the repair lasts. Thanks again for the info.

Dec 05, 2006 | Dell E173FP 17" LCD Monitor

3 Answers

Monitors goes black - Hyundai Q17

I had the same problem some time ago.
After dismateling the power-supply unit it apeared that there was en crack in a solderjoint at one of the power transistors. This transistor has 3 legs (TO220 I believe), from which the middle leg had a solder crack, probebly due to thermal stress. Just resolder and it worked again....
Its worth a try I think.

Succes,  Wim Steenhuis.

Oct 04, 2006 | Hyundai ImageQuest Q17 17" LCD Monitor

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