ASUS B85 PLUS R2.0 does not trigger repair

ASUS B85 PLUS R2.0 does not trigger repair

ASUS B85 PLUS R2.0,no power on, pr825,pin are out of order, and the tin is directly put on, and the fault is repaired.

Machine model: ASUS B85 PLUS R2.0

Fault phenomenon: can not start the machine, press Switch, no response

Maintenance process: after getting the machine, the power supply of the main engine is good.Remove the motherboard, visual inspection no obvious traces of bad, according to no power on thinking.
1. The Switch pin has 3.3V
2. I / O 30 pin has 3.3-0-3.3 current of change

ASUS B85 PLUS R2.0 does not trigger repair Figure 1.

3.32 pin o-spl-s3 – high level.

4. O_Pson ා high level ov is obviously wrong here. Normally it is high level. Press Switch to pull low green line for current of change of high low high;It may be broken;Start checking for broken lines. Start with the green line.O_The circuit of pson is as follows:

ASUS B85 PLUS R2.0 does not trigger repair Figure 2.

The name of the whole route was changed as follows: eatxpwr16 pin— C16 1 pin(ATX ﹣ – — r162 pin(ATX ﹣ pson ා) to 1 pin(o)_PSON#_R —— r216 1 pin– pr825 1 pin(o ﹤ pson ා R) – 2 pin was renamed o_PSON#—–I/O 31 pin。(note that there are no components on the board.)

ASUS B85 PLUS R2.0 does not trigger repair Figure 3.

ASUS B85 PLUS R2.0 does not trigger repair Figure 4.

5. When the pr825 was found, the probe was just gently attached, and the component actually fell off. After a separate measurement,pin was broken, and directly put a tin on it.

6. Plug in the power supply and measure that I / O 31 pin 5V is out;

7. Click Switch to run code booting up, as shown in the figure below.

ASUS B85 PLUS R2.0 does not trigger repair Figure 5.

ASUS B85 PLUS R2.0 does not trigger repair Figure 6.