Hi,
I have a Sceptre X20G monitor and it is not working. I am trying to fix it. I have used this site in the past to help fix things but most of the time i have an idea as to what is causing the problem. This time .......i am clueless.
Symptom:
I power on monitor....tpower on LEDs come on and they are showing "red" in color.....so something is wrong. The Sceptre logo appears on the screen. The logo disappears....screen kinda flickers a bit then this dialog box comes up which i think is trying to indicate there is no connection between computer and monitor.
What i have done:
1-I tested each of the 6 bulbs to see if they work. Now the way i did this was to use an existing / working monitor. I soldered leads/wires onto the "good" monitor from the inverter board. I use these wires to power on the bulbs from the "suspect" monitor. One of the bulbs seems to be bad.
2- So to see if the bulb is the only problem with the suspect monitor what i did next was.....connect a good bulb (instead of the bad bulb) from a known good monitor to the suspect monitor. No change.....i astill get the red led lights.
3-I meaured using an esr meter the big filter caps........at first i measured an esr of 45 or 52....but this was wrong. I did not see the "decimal place". So i think i measured 0.45 and 0.52. However, i dont think i zeroed out the meter (its one of those blue esr meters.......kinda nice but never used one before). I desoldered the big caps and measured there cap values. They are 68uF/250V caps. I measured 60.5uf and 62.7uf.........so slightly less than the 68uF that is on the label. I remeasured the esr zeroing out the this time and i measured 1.1 and 0.9 for esr values. Seems reasonable.
4-I resoldered the big caps back into circuit and powered on monitor. I measured the DC voltage across the big filter caps and measured ~ 163V DC. Is this right?
5-I measured the ESR values for all the caps on the board.........they seem ok. I dont recall all the values measured but they were all less than 1......actually most i think were around 0.1 to 0.15.
I am not sure what the problem is.............the bulb is bad i think but i think there is something else that is also bad. Because when i put a good bulb in (as described above) the problem is still there.........so it has to be something in-addition to just the bulb.
Any advice is welcomed!
Any advice on what voltages i could measure to help identify the problem would be great! I really think this monitor can be fixed....just not sure where the problem is.
I have a Sceptre X20G monitor and it is not working. I am trying to fix it. I have used this site in the past to help fix things but most of the time i have an idea as to what is causing the problem. This time .......i am clueless.
Symptom:
I power on monitor....tpower on LEDs come on and they are showing "red" in color.....so something is wrong. The Sceptre logo appears on the screen. The logo disappears....screen kinda flickers a bit then this dialog box comes up which i think is trying to indicate there is no connection between computer and monitor.
What i have done:
1-I tested each of the 6 bulbs to see if they work. Now the way i did this was to use an existing / working monitor. I soldered leads/wires onto the "good" monitor from the inverter board. I use these wires to power on the bulbs from the "suspect" monitor. One of the bulbs seems to be bad.
2- So to see if the bulb is the only problem with the suspect monitor what i did next was.....connect a good bulb (instead of the bad bulb) from a known good monitor to the suspect monitor. No change.....i astill get the red led lights.
3-I meaured using an esr meter the big filter caps........at first i measured an esr of 45 or 52....but this was wrong. I did not see the "decimal place". So i think i measured 0.45 and 0.52. However, i dont think i zeroed out the meter (its one of those blue esr meters.......kinda nice but never used one before). I desoldered the big caps and measured there cap values. They are 68uF/250V caps. I measured 60.5uf and 62.7uf.........so slightly less than the 68uF that is on the label. I remeasured the esr zeroing out the this time and i measured 1.1 and 0.9 for esr values. Seems reasonable.
4-I resoldered the big caps back into circuit and powered on monitor. I measured the DC voltage across the big filter caps and measured ~ 163V DC. Is this right?
5-I measured the ESR values for all the caps on the board.........they seem ok. I dont recall all the values measured but they were all less than 1......actually most i think were around 0.1 to 0.15.
I am not sure what the problem is.............the bulb is bad i think but i think there is something else that is also bad. Because when i put a good bulb in (as described above) the problem is still there.........so it has to be something in-addition to just the bulb.
Any advice is welcomed!
Any advice on what voltages i could measure to help identify the problem would be great! I really think this monitor can be fixed....just not sure where the problem is.
Attached Files
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
Comment