Question about CTX PV 720 17" LCD Monitor
I have pulled the screen apart and found that heating the high voltage board with a hair drier will allow the unit to come on after about 20 seconds. Previously supplying signal to the monitor for about 10-20 minutes and cycling the power would fix it. Is the indicitive of a bad capacitor or something simple that I could change out on the board?
The problems on the backlight inverter power supply. Open it up and check all the capacitors, it look like a tiny battery cap on the side had writing on it. (Example 1000uf 16v ) if you are lucky you can spot it right away...with a bulged on top of each caps. If not, just replaced all of the caps... Good luck!
Posted on Dec 07, 2008
SOURCE: My monitor appears to have died. It seems to flicker on once every two seconds, just long enough to see there is indeed something displayed. Is there something simple i can do to fix this or should I
This series of monitor has a bad habit of destroying it's capacitors. I have fixed two S762G monitors (almost the same as a S761) by replacing 2 bulged capacitors on the motherboard with new ones. They cost me 50 cents each (plus shipping of like 3 bucks) from digikey.com. Didn't carry them at my local Radio Shack, but they did have them on the shelf at my local Fry's. (about the same price as digkey if you include the shipping costs.)
I would look for any capacitors on the mainboard that have their aluminum disc top bulged up. That's a sure sign of a blown capacitor. Anyone with good soldering skills can replace those for you. (making sure to put them in the right direction for their polarity, and getting the correct rating/voltage/temp) The two caps I had to replace on my S762G's were C21 and C22 and they were both 1000uF 16v 105c high temp radial electrolytic capacitors. Make sure you get the exact same specs for your replacements as from your originals.
The typical symptom of the blown capacitor on this monitor is that it will power on a few seconds, showing the screen properly, then make a slight pop and the power light will go off, then it will come back on again, and do it over and over. Sometimes they will "Warm up" after a while and stay on, but that will only work for a short time (typically under a month or two). After that, the capacitors will be fried and need replaced anyway. Best to fix them right away, to prevent possible damage to other components.
The difference between this symptom and a typical inverter board failure is that the monitor will power cycle repeatedly. Inverter failures usually show up as the backlight only turning on for a second or two showing a good display, then going off and staying off until the monitor is manually power cycled, and if you look really carefully under good lighting you can still make out the display with the backlight dead.
Hope this helps someone...
Posted on Dec 13, 2008
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