Acer AL2216W Power Supply Capacitor Replacement
WP Users: USE THE MOBILE SITE. THE INTRO DOES NOT WORK AND CONTAINS KEY INFORMATION.
- 作成者: Nick
- 所要時間： 2時間
- 難易度: 難しい
If your AL2216W is having problems, it is very likely that it is a capacitor issue. Here are some signs of bad capacitors:
Note: While some issues may be corrected with a partial capacitor replacement, this is not recommended. Do all of the capacitors in one shot and you will not have to worry about the problem coming back a second time.
- Power issues (This monitor has this issue)
- Excessive transformer hum (This monitor has this issue)
- Excessive inverter hum (This monitor has this issue)
- Troublesome Auto adjustment (This monitor has this issue)
- Backlight problems
- Power problems
- Video issues (Examples: Unstable image, Image drops when connected to a computer, does not play nice on higher resolutions, random image drops)
- Random power issues that may only resolve if the monitor is physically unplugged.
Original capacitor values (Only use these if you do not want to install better caps then the monitor came with)
- 25V 1000uF (x2)
- 10V 1000uF (x1)
- 25V 220uF (x2)
- 16V 2200uF (Used on the inverter side of older power supplies)
手順 1 — Discharge the old capacitors ¶
Unplug the monitor and leave it unplugged for 24-48 hours. Wait 5-7 days if you intend to replace the filter capacitor.
手順 2 — Remove the stand ¶
Remove the stand from the monitor. The 4 screws that have to be removed are marked. The bottom screws should be removed first, but this can be done in any order.
手順 3 — Remove the back of the monitor ¶
Remove 4 fine threaded screws from the back of the monitor. All of these screws are the same type and length.
This screw is unique and only goes in one place as the thread is different. Set it aside separately from the other screws.
手順 4 — Unlatch the clips (Bottom) ¶
On the bottom of the monitor, there are four slots to open the monitor. To release these clips, use a Jimmy or flathead screwdriver.
手順 5 — Unlatch the clips (Side) ¶
With the monitor unclipped on the bottom, pull the sides of the monitor up. Do this slowly to avoid damaging the plastics and LCD.
手順 6 — Remove the IEC socket screws ¶
With the back of the monitor off, remove the 2 screws on the IEC power connector.
手順 7 — Remove the video connection screws ¶
Remove the 4 screw pins for the video cables from the monitor. Use a 5mm Nut bit/driver to remove the screw pins from the power supply shield.
手順 8 — Disconnect the backlight cables ¶
Disconnect the CCFL cables from the power supply board.
手順 9 — Disconnect the button board ¶
Disconnect the flat flex cable that goes to the control board.
手順 10 — Remove the power supply shield (Part 1) ¶
Remove the 2 bottom screws that hold the power supply shield to the monitor.
手順 11 — Remove the power supply shield (Part 2) ¶
On the right side of the monitor, remove the remaining screws holding the upper shield in place.
Lift the lower plate up while removing the power supply shield to remove it from the monitor. Once this is done, you will have access to the power supply.
手順 12 — Remove the power supply ¶
This capacitor is only used on older power supply boards. If your board has this capacitor, it should be repalced. However, it can be left alone if it looks okay.
With the power supply shield removed from the monitor, identify the power supply. Along with the listed capacitors, take note of any others you want to replace (Ex: Inverter coil).
Remove the 4 screws from the power supply. Once this is done, lift up the power supply at a slight angle to clear the chassis mounting holes.
手順 13 — (Optional) Capacitor polarity marking ¶
If you are unsure of the position of the capacitors, mark the polarity with a permanent marker. If the capacitors are installed incorrectly, they will explode when the monitor is powered on.
手順 14 — Add flux to the capacitor leads ¶
To prepare the board for capacitor replacement, put flux or solder on the existing capacitors. This will make removal easier.
手順 15 — Remove the old capacitors ¶
Move in a workspace with ventilation or use a fume extractor. Once in an appropriate workspace, desolder the old capacitors. Heat one leg up and remove the capacitor. Do this for both legs.
After removing the capacitors, clean up the old solder. To do this, take a desoldering braid and clean up the solder from the pads. The desoldering braid must be lifted up with your soldering iron.
手順 16 — Installing brand new capacitors ¶
Install new capacitors. Put the corresponding capacitor you are installing in the correct hole. Bend the leads to keep the capacitor from coming out.
手順 17 — Solder the new capacitors in ¶
Once the polarity is verified, solder the capacitors in. Once soldered, cut the excess lead. Do this for all of the capacitors.
手順 18 — Clean the flux off of the board ¶
After verifying there are no cold solder joints, clean the board. This can be cleaned with 91%+ Isopropyl or Denatured alcohol.
手順 19 — Test the monitor ¶
Put the monitor back together and test it by giving it a signal. If your monitor works, an image should be produced.