Friday, December 21, 2012

APEX – PF2720 _ PF2730 _ PF3230 - RANSER – RA29PF - DAEWOO-ST2407PF - [USING STR-G8626] - POWER SUPPLY FAULT FINDING CHART




STR-G8626



PIN FUNCTIONS



STR-G5653 _ G-8626


PIN
SYMBOL
FUNCTION

1
D
MOSFET DRAIN
2
S
MOSFET SOURCE
3
GND
GROUND
4
Vin
SUPPLY VOLTAGE INPUT
5
OCP/FB
OVER CURRENT PROTECTION.


STR-F6654


1
OCP/FB
OVER CURRENT PROTECTION
2
S
MOSFET SOURCE
3
4
5
D
Vin
GND
MOSFET DRAIN
VOLTAGE IN
GROUND

The Series STR-G 86626/5653/F6654 is specifically designed to satisfy the requirements for increased integration and reliability in off-line quasi-resonant flyback converters. The series incorporates a high-precise error amplifying control and drive circuit with discrete avalanche-rated power MOSFET, featuring fewer external components, small-size and standard power supply.  Covering the power range from below 25 watts up to 300 watts for 100/115/230 VAC inputs, and up to 150 watts for 85 to 265 VAC universal input, these devices can be used in a range of applications, from battery chargers and set top boxes, to televisions, monitors, and industrial power supply units.  Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and thermal shutdown protects the power supply during the normal overload and fault conditions.  Low-current startup and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. The series is provided in a five-pin over molded SIP style package, affording dielectric isolation without compromising thermal characteristics.

FEATURES

  • Fly back Operation with Quasi-Resonant Soft Switching for Low Power Dissipation and EMI
  • Rugged Avalanche-Rated MOSFET
  • Soft drive circuit MOSFET
  • Adjustable MOSFET switching speed
  • Choice of MOSFET Voltage and Rds(on)
  • Full Over-Current Protection (no blanking)
  • Under-Voltage Lockout with Hysteresis
  • Over-Voltage Protection
  • Direct Voltage Feedback
  • Low Start-up Current (100 Amax)
  • Low-Frequency, Low-Power Standby Operation
  • Over molded 5-Pin Package
POWER SUPPLY TROUBLESHOOTING CHARTS

  • SMPS HAS NO VOLTAGE OUTPUT


Click on image.  Right click on the enlarged image, save image as, to a folder (My document > My  Pictures).  View it in ‘Picasa’ picture viewer.  There you can enlarge it more.  Download ‘Picasa-3’ by Google site, and install it to your system.  It’s a  free software from Google and download it by Google. [Search for ‘Picasa’ by Google]
  • SMPS ALWAYS IN STANDBY MODE


OTHER FAULTS

  •  CHANNEL NUMBER REMAINS UNCHANGED DURING AUTO PROGRAM


  • NO COLOR


  • ABNORMAL COLOR


  • NO RASTER [HORIZONTAL/VERTICAL SCAN PROBLEM]


  • HORIZONTAL BRIGHT LINE


  • WIDTH PROBLEM


  • E/W DISTORTION

  • NO SOUND