X20G Fails To Power Up - Soloution Found

My monitor (SN517A1108SC1246) has same power on problem issue. This particular monitor was 'repaired' three times by Sceptre all within 4 months starting when 11 months old. The problem seems to occur when the monitor looses AC power completely so I've got mine on an UPS. The "reset" fix by MikeCharlie does work to get it back working. Key is timing, plugging in the power cord then monitor cable just after LED blinks. Tricky but can be done.

I do have another Sceptre X20 (SN505A1108SC2638) on same computer that although a year older, has not had any problems!

Here is a pic!

I have exactly the same problem with my X20G monitor. There is a design problem with the LCD controller board and the Power supply board. The problem is the power sequencing of the power supplies feeding the LCD controller chip. The 2.5V rail has to come on first before any other power rails. Also, some of the power rails don't discharge completely during power down. I was able to fix my X20G by adding a wallmount power supply to feed the 2.5V DC-DC converter input (blue wire) and adding bleeder resistors on two of the power rails on the LCD controller board to discharge it during power down. With this setup, I do the power sequencing by plugging the wallmount power supply first before the plugging the main AC power of the monitor. Only try this fix if you have good knowledge of electronics.

I bought my monitor in the 20 inch Sceptre monitor in November of 07 and it worked fine until about 8 months later. I bought an extended warranty at Microcenter in Dallas and when it started acting up, I took it in. They said they couldn't find anything wrong with it, (even though this seems to be one of the most common problems with these POS Septres) and they told me the typical brain-dead "make sure the outlet you're plugging it into has power" solutions.

A solution I found that worked well for awhile was to keep it plugged into a power surge and NEVER turn it off from the monitor itself, only from the power surge when you turn off your machine. Also, I set the monitor to never turn off in Windows display properties.

That worked for about 4, until I hadn't turned on/off my monitor in about a week. I tried my old tricks (unplugging for about a day then plugging it back in, switching power cords, etc.) and finally I gave up and came to this forum to see if anyone had a solution. Frusterated after plugging and unplugging my monitor for about 15 minutes I laid it screen down on a soft CD case and hit the back of the monitor. I swear to god it turned right back on!!! I'm actually typing on it for the first time in 2 weeks! I wonder how long this will last.....

Suffice it to say, I freaking HATE this monitor and I only bought it cuz it was the brightest, cheapest thing they had at Microcenter. I wouldn't recommend Microcenter or the Sceptre monitor to anyone.

I had the same issue with my X20. You will need to disassemble the unit and reset it by touching a wire lead to the white wire on the Microprocessor circuit board (which leads to the button circuit board) to each of the other color leads, one at a time. This should reset it and you will see the red leds lit. You will need to do this while AC is connected! Be careful.

I just changed the eight 470uf 25v capacitors on the power supply and the unit came back to life.
pretty easy job took 1/2 hour.

I have two of them, Both do it