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Linksys WAG54G WiFi ADSL Router

WAG54G front LFailure on my Linksys WAG54G-v2 router cry

Symptoms :

No ethernet port works, the 4 green LEDs light up briefly during the reset , and then nothing. On the PC side, this results in a cut in the network, it can sometimes even attempt to connect and then cut again. The WiFi function is working properly.
 

 
This scenario, I really lived it, and I obviously looked into the question. In any electronic device, electrolytic capacitors are used to filter the various power supplies. You should know that these components have a limited lifespan, and you have to think about replacing them from time to time. The breakdown is indeed due to aging, as well as to the very high operating temperature. It is enough to bring your hand to the WiFi-PCMCIA card to realize it immediately !!

punctuation icon Before reading the following, please note that I can in no way be held responsible for any damage that your equipment may suffer as a result of this type of manipulation.


It is necessary to start by opening the box, with delicacy because the wire which connects the antenna to the PCMCIA card is short, and the connection plug very small and very fragile. Above all, do not try to disconnect it, the manufacturer claims only about thirty operations !!

If you are careful, you won't have any problems, believe me!
To open the case, you must first remove the 2 front rubber feet using a thin screwdriver. The cruciform screws are inside. Take a close look at your case. On the sides, we can distinguish locking notches at the limit of the black shell and the blue band. wag54g cote smallLocating the Linksys WAG54G-v2 side lock
wag54g underside smallLinksys WAG54G-v2 screw location Hold your box firmly with one hand, and pull while putting pressure on this limit to release the band.
WARNING ! The printed circuit will appear, and it is fragile! Once this is done, you can now dislodge the upper case being very careful!
image of an MMS socket Due to its size, the antenna wire socket is very fragile !!!
Here is finally this famous WiFi-PCMCIA card ! It is largely this which is the cause of the high temperature of this material. The heat it gives off is such that in the end, the device breaks down during its 3rd year.
AVOID TOUCHING THE ANTENNA WIRE CONNECTOR !!!
I will have warned you enough!
wag54g case smallOpening the case of the Linksys WAG54G-v2
wag54G WiFi PCMCIA small
The Linksys WAG54G-v2 WiFi-PCMCIA card
Look carefully at the card, you have to unlock the two latches on the sides, then tilt it slightly upwards, and release it from its socket.
Do like me, flip the upper case on your table, and simply put the card in it. Here she is sheltered for a while ...

wm_player11.jpgCome on, as a bonus, a small unpretentious clip of the disassembly of the device!
(File size: 4.66MB - Duration: 00:01:18)

To remove the motherboard from the lower shell, it is necessary to remove a few screws ... Then, release it from its support by sliding it, plastic retainers hold it. Okay now there are two schools. Those who will only change what they have been told in a post for example, or me!
My experience in the profession of technician (+30 years) taught me to be vigilant ... and foresight. The golden rule of troubleshooting is curative and lasting repair. I am not telling you to replace everything, I am telling you to replace the defective elements, as well as those which may be very soon no doubt.
The Linksys WAG54G-v2 motherboard
The Linksys WAG54G-v2 motherboard
In the case of my router, point of capacitor having swelled or leaked. Totally invisible the breakdown. So invisible that I was in doubt for a moment ... Then resolutely, I armed myself with a blank sheet and a pen to identify the components to be replaced ( 19 in total ). You will find the list further down on this page, with ref. supplier as well as their indicative price. For less than 7 € ( excluding shipping costs ), and a few good big hours in front of you ( multi-layer plate, with metalized holes ), you are left with a super good router, whatever its detractors say!

For this long task ( yes, believe me, I'm used to it ), it would be better to use a thermostatted soldering iron, like Weller ( my favorite ... )and to arm yourself with a good dose of patience. Finally, clean your work with cotton swabs soaked in alcohol, you might as well work cleanly.


So here is this famous list of components!

Okay, I'll explain ... The ' Position ' column is obviously the one noted on the motherboard. Check yours carefully, there are several versions of this router. Take your time, do your scouting yourself, you can never be too careful! Once a few components have been removed, it's difficult to remember who goes where ... The ' Designation ' column gives you information on the dimensions of the components to be replaced, very useful for looking for a supplier ( the problem no longer arises, it is done! )

The operating temperatures are 105 ° C IMPERATIVE! Those provided by 85 ° C will also be replaced by 105 ° C . Well the rest, I thank you ... At Radiospares , I just learned, the mini orders are 150 € HT ... For you to see, try at Farnell , or Conrad or Selectronic but there, I believe less, they are not as well equipped, and there is not too much room in addition, maybe 6mm at most, I would not play ... The prices mentioned in the table are not only indicative, and may vary from one supplier to another.

Respect the dimensions, the format of the capacitor ( radial, nothing else ... ), and of course the operating voltages, knowing that you can very well replace a 16v by one of 25v, and especially not the reverse!

Another important thing, do not ignore the 33µF / 16v, they are the ones that generated this failure ( I did my troubleshooting in 2 steps ... )

Here, I told you everything, in your irons, I pick up the copies next week !!
Good luck, do not despair, it will work, I am convinced of it.

Edit: For those that the temperature of their plot router ...
mine ( repaired in June 2007 ) which operate 24h / 24 broadcasts a very slight temperature 23 ° C . I performed this measurement using a digital sensor from Dallas, the DS1821, placed directly on top of the case. However, this is only an indicative measure, which answers the question that some of you may have regarding the addition of a cooling fan. For my part, I did not want to opt for this radical solution to say the least, and which does not solve the problem at its root.

[Edit of December 30, 2013]
My router still gives me complete satisfaction today, and I have not had any failure since its repair! Curative I tell you ...

Regarding the power supply ...
my transformer (12V / 1000mAh / 12VA) is supposed to provide a voltage of 12V, but it is only a transformer followed by a full-wave rectification and filtering using an electrolytic capacitor. It is rectified, filtered, but not regulated.
For information, the value of the effective voltage across the capacitor corresponds to the following formula:
effective voltageand the value of the maximum voltage ( or c / c: peak to peak ) to this one:
peak voltage

If we consider the tension Vin as ideal, we have:

  Calculated values Measured value Tolerance deviation
Wine = 12.00 V    
Veff = 16.97 V 16.74 V 1.36%
Vc / c = 33.94 V    
 
Original components Ref. Provider
Position Designation RADIOSPARES FARNELL Qty Price
C58 1000µF / 16v - 105 ° C Ǿ 10mm / H 15mm 365-4098
(set of 5)
9692797 3 € 1.60
C70 1000µF / 16v - 105 ° C Ǿ 10mm / H 15mm 365-4098 9692797    
C88 1000µF / 16v - 105 ° C Ǿ 10mm / H 15mm 365-4098 9692797    
C7 470µF / 35v - 105 ° C Ǿ 10mm / H 15mm 628-3920
(set of 5)
9692789 1 € 1.38
C128 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076
(set of 5)
9692789 5 € 0.90
C132 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076 9692789    
C160 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076 9692789    
C102 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076 9692789    
C208 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076 9692789    
C18 470µF / 16v - 105 ° C Ǿ 8mm / H 12mm 365-4076
(set of 5)
9692789 1 € 0.90
C139 10µF / 50v - 85 ° C
-> 50v - 105 ° C
Ǿ 5mm / H 12mm
365-4240
(set of 5)
9692363 3 € 0.50
C140 10µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 12mm
365-4240 9692363    
C12 10µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 12mm
365-4240 9692363    
C85 33µF / 50v - 85 ° C
-> 50v - 105 ° C
Ǿ 5mm / H 8mm
365-4262
(set of 5)
1386075 6 € 0.70
C92 33µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 8mm
365-4262 1386075    
C72 33µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 8mm
365-4262 1386075    
C93 33µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 8mm
365-4262 1386075    
C25 33µF / 50v - 85 ° C
-> 50v - 105 ° C Ǿ 5mm / H 8mm
365-4262 1386075    
C37 33µF / 50v - 85 ° C
-> 50v - 105 ° C
Ǿ 5mm / H 8mm
365-4262
1386075  
    TOTAL =     € 6.68
Tolerance (%) ± 20
Operating temperature (° C) -55 to +105 (≤100V dc), -25 to +105 (≥160V dc)
Leakage current ≤0.01CV or 3µA (≤100V dc), ≤0.06CV or 10µA (≥160V dc)
Life at 105 ° C 2,000 hours, 1,000 hours (diameter = 8mm)
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