Description
This product adopts lcd display, with high power supply, led light intensity, long service life. This product has high power supply efficiency, long life, low price, simple operation and long service life.
No output or low voltage repair steps
- Power supply primary: There must be an IC to be removed, no power supply, in the road multimeter RX1K file to measure the 300V filter capacitor with or without charge and discharge, if there is no charge and discharge, replace this capacitor. Also measure the absorption circuit for short circuit leakage. Also pick up the primary transformer feedback supply diode. Or power measurement +300V, if it is lower than 250V, replace the filter capacitor. As long as the filter capacitor is bulged, it must be replaced.
- Power secondary: directly use the multimeter RX10 file to measure each secondary voltage load end. The forward and reverse resistance of the circuit should be one big and one small. If the positive and negative resistance values are less than 10 ohms, there is a short circuit and the load is unplugged. After measurement and then excluded
- If the load voltage is not connected properly and the load voltage is low, replace the filter capacitor of this load.
- High voltage jitter: The voltage output is high and low with large jitter. It is module protection. Check if the green and gray lines are connected in reverse, and correctly connect the green line to the gray line. The green line must be connected to the main voltage. (For example, household 5V is the main voltage, do not connect to 12V and 24V, in principle, which rectifier diode is connected to which one, the small diode is not the main voltage)
- There are noises: After installing the module, the transformer has high frequency whistling sound, check the absorption circuit. If there is no problem, you can change the resistance value directly above the module switch tube (module is 2W0.22 ohm), which can be 0.22 ohms. Inter-selection, power 2W-3W, the larger the resistance, the smaller the module power, from small to large, no noise can be selected.
- Remote shutdown, install a 1N4148 or FR107 diode on the D3 on the optocoupler side of the module, and solder a negative wire to the C pole of the optocoupler of the original machine. The original optocoupler is connected to the D3 negative terminal. Ground, the module has no output.
Highlights
Suitable for maintenance of LCD TV 14-60 inch power supply within range of 5V-24V within 180W, including maintenance of switching power supply for LCD monitor, DVD, amplifier subwoofer, computer speaker, receiver set-top box, air conditioner, fax machine, etc.
Note:
Do not use this module on a power supply with a main voltage higher than 40V. Otherwise, the TL431 sampling circuit of this module will be damaged.
Package includes: 1× LCD TV Universal Switching Power Supply Module
