Emprex - 26" LCD Monitor - Mfr. Date: May 2008
History:
- Recently purchased from a thrift shop, and went dark after about 2 weeks.
Symptoms:
- Blank black screen, smell of burned component, computers still detect monitor (as Sw26B).
Inspection:
- Took the monitor apart to find a control board and a power board.
- The power board (ILPI-082), near a pair of output leads to the monitor screen, had a visibly burned and ruptured ceramic capacitor, with the following markings:
12J
3KV
JNC
A similarly marked capacitor on the opposite side of the board, for another
pair of output leads, was darkened but not visibly ruptured.
A number of electrolytic capacitors, previous in circuit to the output leads, were
visibly swollen at the top (not ruptured):
1 - 1000uF @ 16v
3 - 470uF @ 25v
Other electrolytic capacitors not visibly swollen:
1 - 1000uF @ 16v
2 - 680uF @ 16v
Action Taken:
- The pair of 12J ceramic capacitors was determined to be (by markings only, not measurement): 12pF @ 3kV
- The pair was replace with 27J 3K, assumed to be 27pF @ 3kV
The source of the replacements were from a Dell monitor power (inverter) board
Hopefully, the extra capacitance is not a negative factor.
- The swollen electrolytic capacitors were replaced with equal values.
The source of the replacements were from McMaster-Carr with low ESR, reportedly.
Results:
- The monitor is still detected by computers, however the display lights up visibly dim but goes black after a few seconds.
An image can be seen for a few seconds, but is clearly dimmer than normal brightness.
Analysis:
- I would say that this is an improvement and I have heard about the 2 second to blank symptom. I will read up on this symptom.
I have had success repairing an LCD TV with help from the forum and look forward to figuring this out to the best of our abilities.
Please advise, and Thanks in Advance
History:
- Recently purchased from a thrift shop, and went dark after about 2 weeks.
Symptoms:
- Blank black screen, smell of burned component, computers still detect monitor (as Sw26B).
Inspection:
- Took the monitor apart to find a control board and a power board.
- The power board (ILPI-082), near a pair of output leads to the monitor screen, had a visibly burned and ruptured ceramic capacitor, with the following markings:
12J
3KV
JNC
A similarly marked capacitor on the opposite side of the board, for another
pair of output leads, was darkened but not visibly ruptured.
A number of electrolytic capacitors, previous in circuit to the output leads, were
visibly swollen at the top (not ruptured):
1 - 1000uF @ 16v
3 - 470uF @ 25v
Other electrolytic capacitors not visibly swollen:
1 - 1000uF @ 16v
2 - 680uF @ 16v
Action Taken:
- The pair of 12J ceramic capacitors was determined to be (by markings only, not measurement): 12pF @ 3kV
- The pair was replace with 27J 3K, assumed to be 27pF @ 3kV
The source of the replacements were from a Dell monitor power (inverter) board
Hopefully, the extra capacitance is not a negative factor.
- The swollen electrolytic capacitors were replaced with equal values.
The source of the replacements were from McMaster-Carr with low ESR, reportedly.
Results:
- The monitor is still detected by computers, however the display lights up visibly dim but goes black after a few seconds.
An image can be seen for a few seconds, but is clearly dimmer than normal brightness.
Analysis:
- I would say that this is an improvement and I have heard about the 2 second to blank symptom. I will read up on this symptom.
I have had success repairing an LCD TV with help from the forum and look forward to figuring this out to the best of our abilities.
Please advise, and Thanks in Advance
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