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NO B+ VOLTAGE CRT TV REPAIR

NO B+ VOLTAGE  CRT TV REPAIR

CRT TV FUNTIONAL WORKING VOLTAGE 250/110v 50/60 Hz AC
POWER SUPPLY 450V 150UF OR 220UF      MAIN FILTER CAPACITOR  WORKING VOLTAGE 250VDC TO 350VDC.


SMPS RECTIFIER DIODE AND STARTUP RESISTOR RASTER BURNED OR SHORTED NO VOLTAGE CROSS SMPS SECTION.

MAIN FILTER CAPACITOR  WAS OPEN OR BULGED, SMPS SECTION SHORTED OR BLOWN FUSED.

NO B+ VOLTAGE FOR SECONDARY  SECTION TV HAS BEEN NOT TURNING ON.

HOW TO REPAIR B+ VOLTAGE,


TRANSISTOR 2SA1015 AS CASUSED OR SHORTED NOT CROSSING VOLTAGE SECONDARY SECTION FOR B+ VOTAGE, 1015 TRANSISTOR  SHORTED OPTOCOUPLER IC NOT TURNING ON TV.
TRACE FAULT  FOR SMPS SECTION IN USE DIGITAL MULTIMETER.

SMPS SECTION WAS GOOD, BUT TV STILL NOT TURNING ON, SECONDARY SECTION
CHECK SECONDARY DIODE AND 160V/100UF ELECTROLYTIC CAPACITOR.

THEN VERTICAL SUPPLY VOLTAGE  35V/100UF OR 50V/100UF BULGED OR OPEN NO VOLTAGE  TV  HAS NO RED LIGHT .

FLYBACK TRANSFORMER COIL BURNED TV HAS NO POWER UP NO B+ VOLTAGE.

TRACE VOLT USING DMM SET 1000VOLT DC CHECK ALL VOTAGE AND REPAIR IT.



5 comments

  1. if the secondary voltage are all ok and 110v is reaching flyback,but still tv is nt on, HOT is ok,where should i check
    • try replacing the flyback ..
  2. when tv is on standby mode, does it should be no b+ in the secondary?
  3. I want to me Onida use in eht number of EF22451 equivalent no
  4. C912