Hi,
I have a Dell 2000FP LCD monitor.
Problem description:
When i power up the monitor the green led comes on and stays on but there is no picture shown.
I am enclosing pictures of the boards (see enclosed pics).
Overall => Shows both inverter board and main board
Inverter_Pic=>Shows pic of inverter. Shows pad numbering for transformers. Note: I think pad1 of transformer is denoted by "yellow" dot.
Mag_Invert_1=>Close up of left side of inverter
Mag_Invert_2=>Close up of middle of inverter
Mag_Invert_3=>Close up of right side of inverter
What i have done thus far:
1-With the power on i shine a flash-light onto the screen. I can see a faint image. So this tells me from past experience that its probably either the bulbs or inverter board.
2-I checked each of the 6 bulbs with my "home-made" bulb tester. They all appear to be "good" bulbs.
3-I also measured the transformer using DVM:
Note: Transformer was "in-circuit" for these measurements.
Transformer A:
Pin1_to_Pin8: 3.88Mohm
Pin1_to_Pin9: 3.88Mohm
Pin1_to_Pin10: 3.88Mohm
Pin1_to_Pin11: 3.88Mohm
Pin2_to_Pin8: 6.15Kohm
Pin2_to_Pin9: 6.15Kohm
Pin2_to_Pin10: 6.15Kohm
Pin2_to_Pin11: 6.15Kohm
Pin3_to_Pin8: 6.13Kohm
Pin3_to_Pin9: 6.13Kohm
Pin3_to_Pin10: 6.13Kohm
Pin3_to_Pin11: 6.13Kohm
Pin4_to_Pin8: 6.11Kohm
Pin4_to_Pin9: 6.11Kohm
Pin4_to_Pin10: 6.11Kohm
Pin4_to_Pin11: 6.11Kohm
Pin5_to_Pin8: 6.08Kohm
Pin5_to_Pin9: 6.08Kohm
Pin5_to_Pin10: 6.08Kohm
Pin5_to_Pin11: 6.08Kohm
Pin6_to_Pin8: 3.84Mohm
Pin6_to_Pin9: 3.84Mohm
Pin6_to_Pin10: 3.84Mohm
Pin6_to_Pin11: 3.84Mohm
Pin7_to_Pin8: 199.2ohm
Pin7_to_Pin9: 199.2ohm
Pin7_to_Pin10: 199.2ohm
Pin7_to_Pin11: 199.2ohm
Transformer B:
Pin1_to_Pin8: Open
Pin1_to_Pin9: Open
Pin1_to_Pin10: Open
Pin1_to_Pin11: 3.8Mohm
Pin2_to_Pin8: Open
Pin2_to_Pin9: Open
Pin2_to_Pin10: Open
Pin2_to_Pin11: 5.91Kohm
Pin3_to_Pin8: Open
Pin3_to_Pin9: Open
Pin3_to_Pin10: Open
Pin3_to_Pin11: 5.11Kohm
Pin4_to_Pin8: Open
Pin4_to_Pin9: Open
Pin4_to_Pin10: Open
Pin4_to_Pin11: 5.91Kohm
Pin5_to_Pin8: Open
Pin5_to_Pin9: Open
Pin5_to_Pin10: Open
Pin5_to_Pin11: 5.88kOhm
Pin6_to_Pin8: Open
Pin6_to_Pin9: Open
Pin6_to_Pin10: Open
Pin6_to_Pin11: 3.8Mohm
Pin7_to_Pin8: Open
Pin7_to_Pin9: Open
Pin7_to_Pin10: Open
Pin7_to_Pin11: 199.2ohm
NOte: If there is a better way to show this data in a tabular format let me know.
4-I also measure the voltages present on the connector.
Pin8: 19.75V
Pin7: 19.75V
Pin6:19.75V
Pin5: 0V
Pin4: 0V
Pin3: 0V
Pin2: 1.972V
Pin1: 3.279V
Basically i would like some input on what to try/do next. From above is the transformer "bad"? Also, any inputs / suggestions you can give please let me know.
NOte: I was planning to re-solder the transformer connections but i wanted to post what i have done thus far.
I have a Dell 2000FP LCD monitor.
Problem description:
When i power up the monitor the green led comes on and stays on but there is no picture shown.
I am enclosing pictures of the boards (see enclosed pics).
Overall => Shows both inverter board and main board
Inverter_Pic=>Shows pic of inverter. Shows pad numbering for transformers. Note: I think pad1 of transformer is denoted by "yellow" dot.
Mag_Invert_1=>Close up of left side of inverter
Mag_Invert_2=>Close up of middle of inverter
Mag_Invert_3=>Close up of right side of inverter
What i have done thus far:
1-With the power on i shine a flash-light onto the screen. I can see a faint image. So this tells me from past experience that its probably either the bulbs or inverter board.
2-I checked each of the 6 bulbs with my "home-made" bulb tester. They all appear to be "good" bulbs.
3-I also measured the transformer using DVM:
Note: Transformer was "in-circuit" for these measurements.
Transformer A:
Pin1_to_Pin8: 3.88Mohm
Pin1_to_Pin9: 3.88Mohm
Pin1_to_Pin10: 3.88Mohm
Pin1_to_Pin11: 3.88Mohm
Pin2_to_Pin8: 6.15Kohm
Pin2_to_Pin9: 6.15Kohm
Pin2_to_Pin10: 6.15Kohm
Pin2_to_Pin11: 6.15Kohm
Pin3_to_Pin8: 6.13Kohm
Pin3_to_Pin9: 6.13Kohm
Pin3_to_Pin10: 6.13Kohm
Pin3_to_Pin11: 6.13Kohm
Pin4_to_Pin8: 6.11Kohm
Pin4_to_Pin9: 6.11Kohm
Pin4_to_Pin10: 6.11Kohm
Pin4_to_Pin11: 6.11Kohm
Pin5_to_Pin8: 6.08Kohm
Pin5_to_Pin9: 6.08Kohm
Pin5_to_Pin10: 6.08Kohm
Pin5_to_Pin11: 6.08Kohm
Pin6_to_Pin8: 3.84Mohm
Pin6_to_Pin9: 3.84Mohm
Pin6_to_Pin10: 3.84Mohm
Pin6_to_Pin11: 3.84Mohm
Pin7_to_Pin8: 199.2ohm
Pin7_to_Pin9: 199.2ohm
Pin7_to_Pin10: 199.2ohm
Pin7_to_Pin11: 199.2ohm
Transformer B:
Pin1_to_Pin8: Open
Pin1_to_Pin9: Open
Pin1_to_Pin10: Open
Pin1_to_Pin11: 3.8Mohm
Pin2_to_Pin8: Open
Pin2_to_Pin9: Open
Pin2_to_Pin10: Open
Pin2_to_Pin11: 5.91Kohm
Pin3_to_Pin8: Open
Pin3_to_Pin9: Open
Pin3_to_Pin10: Open
Pin3_to_Pin11: 5.11Kohm
Pin4_to_Pin8: Open
Pin4_to_Pin9: Open
Pin4_to_Pin10: Open
Pin4_to_Pin11: 5.91Kohm
Pin5_to_Pin8: Open
Pin5_to_Pin9: Open
Pin5_to_Pin10: Open
Pin5_to_Pin11: 5.88kOhm
Pin6_to_Pin8: Open
Pin6_to_Pin9: Open
Pin6_to_Pin10: Open
Pin6_to_Pin11: 3.8Mohm
Pin7_to_Pin8: Open
Pin7_to_Pin9: Open
Pin7_to_Pin10: Open
Pin7_to_Pin11: 199.2ohm
NOte: If there is a better way to show this data in a tabular format let me know.
4-I also measure the voltages present on the connector.
Pin8: 19.75V
Pin7: 19.75V
Pin6:19.75V
Pin5: 0V
Pin4: 0V
Pin3: 0V
Pin2: 1.972V
Pin1: 3.279V
Basically i would like some input on what to try/do next. From above is the transformer "bad"? Also, any inputs / suggestions you can give please let me know.
NOte: I was planning to re-solder the transformer connections but i wanted to post what i have done thus far.
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