My monitor was just blinking folowing the thunderstom some days back and I tried to replace some 4 capacitors coded C5707,and it comes on but abnormal display and then the replaced transistors burn out after switching it on and off.What can I do?

You have shorted transistors (c5707) in the inverter circuits, also need to check for poor solder joints and the tuning caps in the inverter transformers driving section.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed DELL monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Replacement bd. www.lcdrepair.us
Service manuals: http://elektrotanya.com/?q=showresult&megnev=dell&megnev2=%20e173fp&kategoria=&kat2=all

Replace the high voltage transformer. It is the ballast for the backlight.. If you could pinpoint the one that's overheating then that is the one that needs replacement. Much better if you will replace the four transformer...


Hope that answer your question..
Much appreciated if you could rate this help. thanks.

First what kind of monitor and model.
Second, don't use the monitor if you can hear and or see problems, have the unit repaired or replaced.
The caps are easy enough to replace if you have the savy.... With no model number I can't tell what kind of unit you have but if you mean C5707 and not C707, you have a Dell or BenQ monitor.
The C5707 is a 8 amp NPN transistor.
I have removed and replaced about 20 sets and used a TIP3055 which is a 10 amp rated.
You should have 4 to be replaced.
You also may have to watch what size the caps are, as if too long, they will hit the shield.
Good luck.

That is either a defective controller board or a faulty LCD controller board.

Parts must be tested before replacement.

Check the C5707 transistors especially its corrensponding hfe value. Replace caps

See if you can change the video cable and get the same problem. Make sure it is plugged in securely (both video and power cords).

If same thing happens with a different cable try a different monitor. Maybe if you don't already have another one, someone you know can let you use theirs for a day.

If neither option works, it's probably your video card. If changing the monitor works then it's probably your monitor either going bad or try reinstalling the video driver on your computer.

Let me know if anything works, I hope this helps

Your C5707 transistors in the monitor have failed. Suggest replacing all four with the Sanyo C5707 transistor. A common problem.

hello guys

I had the same problem. My LCD ViewSonic VX 924 has been blinking

For repar it i changed the following capacitors : 100uF/400v
330uF/25v and 330uF/35v

if that always flickers you can also change the two 470uF/25v capacitors
The link for a pic Alime and Capacitors
http://img25.imageshack.us/my.php?image=alimefsp0351pi01.jpg

DO NOT TOUCH NOTHING D'OTHERS ANS DISCONNECT ELECTRICITY CABLE BEFORE PROCEEDING

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.

hi. i had the same problem and fixed it. the problem are the 4 transistors (C5707) one of more are shorted (Q739,Q740 and Q759, Q760). Also the fuse PF751 (3a) has to be replaced in most cases. In my case i replaced the fuse and 1 transistor (C5707)