Asus vw195s Turns off after a few seconds.

Hi guys,

Today we have another normal issue with old LCD’s, this one turns off after about 2 or 3 seconds. This monitor is part of a CCTV system, so normally it works around 24/7, so internally it has a lot of hours of use as you can see by the discoloring of its power board. This is pretty standard for a Asus LCD from 2008. Usually when a cliente brings in a LCD monitor and tells use that the monitor shows the image for 2-3 seconds and then turns off, we immediately ask what the monitor is used for on a day to day basis, because this lets us know a ball park range of parts that we are going to be using and it gives us the capability of issuing a estimate on the spot, saving us and the cliente time and money.

Moving ahead, the monitor is a Asus VW195S, manufactured around 2008, and with plenty of working hours in its résumé. Internally it is equipped with a Power Board (4h.09302.a02).

Asus VW195S Backplate View
Asus VW195S Backplate View

So as usual, first thing to do, besides testing it for yourself and confirming the fault. Would be to open it up and take a look inside. Always Use extreme caution when managing the internal boards, because even when powered off, that main capacitor can bite pretty badly. I personally use this little (4K7 – 5% – Ceramic Resistor)

4K7 Ceramic Resistor
Discharge Capacitors With 4K7 Ceramic Resistor

As you can see below, the power board has all the signs off hours and hours of continuous use, it is highly discolored and has four blown caps clearly visible. The fifth Capacitor the we changed is the one indicated with a blue arrow, because it sits near a blown capacitor we always test  then and it did indicate faulty values on our Peak ESR70 tester.

Asus VW195S Power Bord 4h.09302.a02
Asus VW195S Power Bord 4h.09302.a02 with Blown Capacitors

We tested all the bad Capacitors with our Peak Atlas ERS+ ESR70, and just as expected it showed “Leaky” and a High ESR Value, on all of them, and also one of them show a open circuit reading.

Peak Atlas ESR70 Test
Peak Atlas ESR70 Test
Peak Atlas ESR70 Test 2
Peak Atlas ESR70 Test 2
Peak Atlas ESR70 Test 3
Peak Atlas ESR70 Test 3
Peak Atlas ESR70 Test 4
Peak Atlas ESR70 Test 4
Peak Atlas ESR70 Test 5
Peak Atlas ESR70 Test 5

To Resume up the repair, all we had to do was to desolder those four 330uf 35V Capacitors with four new Caps, and one 1000uf 16V with a 1000uf 25V that we had in stock

Note: If the value varies slightly up between 20 or 30% in LCD’s repairs, there is not a problem.

So after a few hours testing this Asus VW195S, everything was working as expected.

Asus VW195S Working, bench test
Asus VW195S Working, bench test

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Thanks for reading.

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