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The FSP368-4F04 power board is used in some of the earlier Changhong 46-inch or 47-inch LCD color TVs, such as the LT4619P, LT4719FHD, etc. The board can directly replace GP04, GP04-1, JUJ7.820.200280.00 power supplies. board. The power board consists of three parts: First, the PFC power factor correction circuit is composed of the integrated circuit 2A20112 (U601) as its core, and the +300V ripple voltage obtained by the rectification and filtering is increased to 380V to supply the main switching power supply. The second is the sub-switching power supply with integrated circuit A6069H (U501) as its core, generating +5VS/lA and VCC voltages, of which 5.2VS/1A is the power supply for the mainboard control system; after the second power on, the output is 5.2V/3"A. Power supply for the small-signal processing circuit of the mainboard and VCC voltage is controlled by the standby circuit to supply power for the main power supply and the PFC drive circuit Third, the main switching power supply composed of the integrated circuit SSC9502S (U101) as the core, output voltage of +24V/12A, supply Backlight drive circuit.
Open/standby adopts the way of controlling PFC power factor correction circuit U601 and main switching power supply driving circuit U101 to supply power. After the mains power is turned on, the sub power supply works first to generate VCC voltage and 5.2VS/1A voltage. After the second power on, 5.2V voltage is output under the action of the on/standby control circuit, and the VCC voltage is sent to U601 and U101, PFC power factor correction circuit and the main power start work, the whole machine into the boot state.
A6069H's full name is STR-A6069H. It is a single chip of pulse width modulation type switching power supply developed by Sanken Company. It has built-in MOSFET with voltage resistance of 700V. The internal oscillator has an oscillation frequency of 100kHz and output power of about 10W. Its pin function is The measured data is shown in Table 1. 
The SSC9502S is a DC-DC converter IC with full-wave current resonant mode that is interchangeable with the SS9512S. The IC has built-in soft-start, frequency control, high/low-end drive and overvoltage, overload, and overheat protection circuits. The pin functions and measured data are shown in Table 2. 
2A20112 is a critical conduction mode PFC control chip, built-in soft-start, with feedback loop short-circuit detection, overvoltage protection and overcurrent protection and other functions, with high efficiency, low noise switching, the maximum operating voltage of 24V, the reference output voltage (VREF) is 5V, and the value of the low-voltage lockout (UV-LO) circuit is 10.5v.
The IC is in the SOP-16 package format. The pin functions and measured data are shown in Table 3. 
  In addition, the actual measured data of the feet of the optocouplers PC 101, PC 102, PC501 and PC502 on the power supply board are shown in Table 4. 
CHANGHONG FSP368-4F04 Power Supply Board Working Principle and Maintenance Data Solution
Power board working principle, maintenance solution