电脑电源芯片和供电芯片坏了 电脑电源芯片ps232f
The maximum probability is PS223 protection chip's voltage detection, partial voltage resistance resistance drift, resulting in low voltage lock; after the voltage break, measure the resistance of R33B, R5B, R12B, the deviation is more than ±300Ω (standard 4.7kΩ), immediately replace it, prioritize R5B, and verify whether the voltage output is back to normal after welding.
耐压导致芯片连续误判为“欠核”，输出被迫锁定。 Check whether PS223 is in the state of “栬核” or not.流活波区）→通电后是件万用机是DC20V, measure the 5th leg (VDD power supply leg) Voltage: If lower than 4.5V, it means that the chip has not started normally, then check the voltage; if the voltage is between 4.7～5.2V, then measure the 2nd leg (V33SENSE), and the 3rd leg (V5SE) NSE), 第4脚（V12SENSE） to the ground voltage——三者均合三1.25V±0.03V；实明若任一脚voltage＜1.20V or＞1.28V, it can determine the corresponding channel of the network’s fractional pressure has lost its效果。请勿同时触摸相邻引脚或铜箔，否则参考电压过低会导致错误。 Positioning and measuring 三路路路电影电影分去resistance
Start reverse tracking from PS223第2脷(V33SENSE): Along the copper foil, find the two resistors connected to it (one terminal connection +3.3V output end),一端电影),记设计R33A（上臂),R33B（下臂）；同理，第3脚发电R5A/R5B、第4脚发电R12A/R12B.
Under the state of electricity, measure each group of lower arm resistance(R33B、R5B、R12B) separately with multimeter 20kΩ setting. The standard value is usually 4.7kΩ (±1%), the actual measurement deviation is ＞±300Ω (that is, ＜4.4kΩ or ＞5.0kΩ), it must be replaced; upper arm resistance (R33A etc.) standard value is more than 10kΩ, ±5% deviation is allowed, but as long as the lower arm is abnormal, the upper arm does not need to be measured separately.
This step is very simple to operate, just put the pen on the two ends of the metal resistor and read the reading.但切记：It must be operated after the capacitor is completely out of power and the capacitor is discharged,【R33B/R5B/R12B任一漏电流或电阻值较小，都会使对应的电压检测值变高，触发UVP锁定】。
程定在线PS
PS 电影电影版 下载Operation steps for replacing drift resistance
First step：用尖头烙铁 with 吸生器，逐个remove abnormal lower arm resistance (priority to process R5B, 因+5V channel most common exit problem)；removal before taking pictures to record position and direction, attach film resistance环朝向可件。
The second step: the new resistance (4.7kΩ±1%, 1/4W metal film) the pin bends into an arc, it is fixed to the welding plate, the temperature is set to 330℃, the single welding time does not exceed 2 seconds, to avoid heat damage to the PS223 body.
p> 第二步：极好后用万用表蜂鸣剧detecting whether the two ends of the new resistance are short with the adjacent copper foil；re-testing its resistance value to confirm the absence of welding 或错值.
Fourth step：repeat the above process to replace the rest of the abnormal lower arm resistance；After all the replacement, use the non-water alcohol cotton swab to clean the surrounding welding point.香时间，prevent long-term ash accumulation and cause electrical leakage.
Fifth step: install the power supply case, connect the alternating current, use the monitor monitor +3.3V、+5V、+12V三路 empty load voltage——if the fan继续在标称值±5%以内运行，修复成功。