Good day everybody
I hope I'm posting in the right section - I am new to this awesome forum.
I have received an ACER Ferrari F-20" LCD Monitor to repair.
It produces interference lines on the image displayed and slowly rotates across the whole screen, with respect to the center of the screen. One rotation takes about 4 minutes and the cycle repeats over and over.
For some reason the On Screen Display Menu is not affected when switched on with the Menu button.
I opened the external 18V power supply and see no bulged capacitors or anything suspicious. It uses Rubycon branded caps.
The output voltage measures 18.35V when the monitor is switched on and displaying an image while connected to the VGA port of my laptop.
When I opened the monitor, I immediately noticed that the 3 leaded electrolytic capacitors (C1,C2 and C3) on the top side of the inverter pcb were bulged. The values are 180uF 35V each. Their ESR was high (10R to 20R) and the capacitance not measurable. They are connected directly to the power coming in through connector CN1 at the top of the pcb.
My questions:
1. Is it possible that the faulty capacitors can cause the interference described above?
2. The original capacitors used on the pcb has got the following specs, as found on the datasheet:
Brand: CapXon
Series: GF Series - Low Impedance
Case size: 8mm Diameter X 16mm Length
Impedance: 0.098R @ 100KHz & 20 deg C
Ripple Current: 810mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.09 @120Hz
Endurance: 3000 Hours
Temperature Range: -55 to 105 deg C
When searching DigiKey for replacements, the following options are available, limited by the maximum height:
Brand: Wurth
Series: WCAP-ATLI
Part Number: 860080574010
Case size: 8mm Diameter X 16mm Length
Impedance: 0.098R @ 100KHz & 20 deg C
Ripple Current: 810mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.09 @120Hz
Endurance: 3000 Hours
Temperature Range: -55 to 105 deg C
Brand: Panasonic
Series: FR-A - Low ESR (Same as FM Series)
Part Number: EEU-FR1V181
Case size: 8mm Diameter X 11.5mm Length
Impedance: 0.056R @ 100KHz & 20 deg C
Ripple Current: 950mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.12 @120Hz & 20 deg C
Endurance: 6000 Hours
Temperature Range: -40 to 105 deg C
Brand: United Chemi-Con
Series: KYB - Low impedance, high ripple and long life from KYA series
Part Number: EKYB350ELL181MHB5D
Case size: 8mm Diameter X 11.5mm Length
Impedance: 0.087R @ 100KHz & 20 deg C
Ripple Current: 840mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.12 @120Hz & 20 deg C
Endurance: 7000 Hours
Temperature Range: -40 to 105 deg C
The Wurth capacitor is basically a perfect match, compared to the CapXon.
I don't know if Wurth is a good brand; I have never used them. I have read the discussion on this forum about different cap brands - the good and bad ones.
Should I select the Wurth as the exact match, or should I rather choose the Panasonic or United Chemi-con? Their endurance is higher and the impedance/ripple current specs are better.
3. If you do advise me to use one of the latter two, is the fact that their height is much shorter a problem? I have never really understood for example if two caps are identical, but one is half the other one's height, if they are still seen as identical.
I would really appreciate your advice and input.
Thank you very much.
I hope I'm posting in the right section - I am new to this awesome forum.
I have received an ACER Ferrari F-20" LCD Monitor to repair.
It produces interference lines on the image displayed and slowly rotates across the whole screen, with respect to the center of the screen. One rotation takes about 4 minutes and the cycle repeats over and over.
For some reason the On Screen Display Menu is not affected when switched on with the Menu button.
I opened the external 18V power supply and see no bulged capacitors or anything suspicious. It uses Rubycon branded caps.
The output voltage measures 18.35V when the monitor is switched on and displaying an image while connected to the VGA port of my laptop.
When I opened the monitor, I immediately noticed that the 3 leaded electrolytic capacitors (C1,C2 and C3) on the top side of the inverter pcb were bulged. The values are 180uF 35V each. Their ESR was high (10R to 20R) and the capacitance not measurable. They are connected directly to the power coming in through connector CN1 at the top of the pcb.
My questions:
1. Is it possible that the faulty capacitors can cause the interference described above?
2. The original capacitors used on the pcb has got the following specs, as found on the datasheet:
Brand: CapXon
Series: GF Series - Low Impedance
Case size: 8mm Diameter X 16mm Length
Impedance: 0.098R @ 100KHz & 20 deg C
Ripple Current: 810mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.09 @120Hz
Endurance: 3000 Hours
Temperature Range: -55 to 105 deg C
When searching DigiKey for replacements, the following options are available, limited by the maximum height:
Brand: Wurth
Series: WCAP-ATLI
Part Number: 860080574010
Case size: 8mm Diameter X 16mm Length
Impedance: 0.098R @ 100KHz & 20 deg C
Ripple Current: 810mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.09 @120Hz
Endurance: 3000 Hours
Temperature Range: -55 to 105 deg C
Brand: Panasonic
Series: FR-A - Low ESR (Same as FM Series)
Part Number: EEU-FR1V181
Case size: 8mm Diameter X 11.5mm Length
Impedance: 0.056R @ 100KHz & 20 deg C
Ripple Current: 950mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.12 @120Hz & 20 deg C
Endurance: 6000 Hours
Temperature Range: -40 to 105 deg C
Brand: United Chemi-Con
Series: KYB - Low impedance, high ripple and long life from KYA series
Part Number: EKYB350ELL181MHB5D
Case size: 8mm Diameter X 11.5mm Length
Impedance: 0.087R @ 100KHz & 20 deg C
Ripple Current: 840mA RMS @ 100KHz & 105 deg C
Dissipation Factor: 0.12 @120Hz & 20 deg C
Endurance: 7000 Hours
Temperature Range: -40 to 105 deg C
The Wurth capacitor is basically a perfect match, compared to the CapXon.
I don't know if Wurth is a good brand; I have never used them. I have read the discussion on this forum about different cap brands - the good and bad ones.
Should I select the Wurth as the exact match, or should I rather choose the Panasonic or United Chemi-con? Their endurance is higher and the impedance/ripple current specs are better.
3. If you do advise me to use one of the latter two, is the fact that their height is much shorter a problem? I have never really understood for example if two caps are identical, but one is half the other one's height, if they are still seen as identical.
I would really appreciate your advice and input.
Thank you very much.
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