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.
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