2. Fault type
Driver output abnormality, fan abnormality, relay non-suction, no display on power,
etc.
(Note: R151 on the P line is a 0Ω resistor, if the resistor fails, it will lead to bus voltage
disconnection without power, which will lead to the switching power supply has no power,
resulting in no display, so, in the absence of display, to detect whether the 0Ω resistor is
normal)
3. Method of overhaul
Static detection
1. Detect the starting resistor, voltage divider resistor, shunt resistor resistance value,
whether the phenomenon of resistance damage, replace the damaged resistor; Second,
measure the switching tube (Q1 = STFW3N150), usually switching power supply does not
work, a large part of the reason is because of the switching tube is broken, resulting in
damage to the chip UC3844, therefore, if the switching tube is damaged, replace the Mos
tube
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