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STANDBY STR 50112 IS USED IN IT. NOW ITS POWERSUPPLY OUTPUT VOLTAGE IS BELOW 50V AND CONTINUING STANDBY MODE

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Change the capacitors in the primary

Posted on Jan 19, 2008

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Load the 110 output and disconnect pin number five of STR, now full output will be showed, pin five is controlled from system control ic, trace this route.

Posted on Jan 19, 2008

  • Arun John
    Arun John Jan 22, 2008

    Hello,



    As an add on to what I have posted last day, this pin five is the standby control pin for the STR, and it is controlled from the television microprocessor. This STR outputs a voltage around 50V in standby, so I believe the power supply is okay, the problem is most probably with oscillation because microprocessor controls the STR depending on the horizontal and vertical sync pulses. So disconnect the control pin and trace out the problem.

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Posted on Jan 02, 2017

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1 Answer

DOES STR W6756 CAUSE VOLTAGE TO DROP?


There are many reasons for the voltage drop. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Sep 08, 2015 | Televison & Video

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I have a sony kv-2199xf TV .. this TV no power on ..not working standby red light .. ac power board working fin.. i replaced STR but no power on and standby light no working.. how fix this prob?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

May 30, 2015 | Sony Televison & Video

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no burn.no output voltage on ic 050rdc2

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I have a KDL52s5100 it is not working(no lights, dose not t turn on) due to a thunderstorm. I have bought 2 powersupply board and a new main board and still nothing turns on no even a light.. please help....


make sure that all the voltages in the power supply output are present before connecting to the control motherboard. also confirm that the cables supplying the voltages to the motherboard are all matching e.g do not make a mistake to connect the 3.3v cable to the 12v terninal. just be cautios and your system will power up

Sep 21, 2011 | Sony BRAVIA KDL-V40XBR1 40 in. LCD HDTV

1 Answer

Hitatchi 42pd5000 will not power up


pls. open H-output trangister and out side of pcb and check voltage B+ 135v dc is ok ?.
if yes.then ...H-OUTPUT trangister checked and replace
if not then check SMPS .
1.fuse
2.STR
3.output Dyode
check
1st fuse is open then check rectifier dyode cantunity. if sort then replace all 4 dyode.(rectifier)
and if dyode is ok .then check STR cantunity is sort then Replace with New STR but 1st 220uf/450v dc capaciter cheked / 2nd. in SMPS stage any P.F and capciter likage or sort cheked or chenged first after the NEW STR use
*. note: smps pcb checkd any dry canaction pls. Resolder first.

Oct 04, 2009 | Hitachi Televison & Video

1 Answer

Not working no lights coming on front panel ,i striped it put new paddles in it , plumbed it in turned it on nothing was working before striping it


When everything does'nt work the problem is usually esier to solve..it implies a faulty power source.

The fault may lie internal or external to machine. To rule out external machine fault try to use some other appliance on the same plug point if it works we know the probles lies within the machine.

If the problem lies within the machine, unplug power source and open the machine.determine where the power cable terminates within the machine. We are now going to check for breakages in the powe cable (that connect the machine to power source) You will require a multimeter. With the multimeter placed on continuity mode check for continuity between the plug point and internal terminating point, you need to perform the continuity test for both live and neutral in unplugged mode.

Next if the fault is ruled out in the cable the fault most certainly lies in the SMPS to check this we need to take a few precautions and carefully observe the power input and output points on the washing machines SMPS (Switch Mode PowerSupply) older machines use a transformer but it all boils down to correctly determining the input and output terminals.

Now with the multimeter in Volt meter mode(AC), carfully power the machine through AC Mains, ensure that the ground and machine are not damp (wet) without having physical contact with the machine you need to test the voltage across the input terminals (this should read around 110 to 220 (AC)Volts depending on the standards of your country) then check the voltage off the input terminals this should read between 20 and 80 Volts DC.

In most cases with your typical problem mentioned you will fail to receive an output voltage at this stage and can conclude that the SMPS is faulty.

If the SMPS is faulty you'd simply have to change it , in some cases though these have detachable fuses which blow off. In the lastter case you can try a fuse rep[placement.
This should solve your problem.

Jul 09, 2009 | Washing Machines

1 Answer

Dead unit


your problem is that your output is less than normal

first you isolate h/output from power supply if it comes to normal(115V).

then problem in h/output stage

for that you check

h/output,cap & diode in flyback section & flyback transformer.

but power output is still 50v then problem in power supply for that check oscillator ckt & switching output.

good luck.

Oct 17, 2007 | Philips 27PT543S 27" TV

1 Answer

JVC TV- MODEL AV-K21T.


it was not necessry to replace so many parts if you go as per proper procedure.please proceed as 1 isolate horizontal output section from power supply & make power supply ok. 2 if it becomes ok check hor osc,driver&h/output section. 3 if it is ok connect power input to hor.section which was isolated. 4 check for loose contact or print. 5 put on tv .

Sep 22, 2007 | Televison & Video

1 Answer

Power fault


You probably have shorted rectifiers and/or transistor(s) on standby board. Trouble-shoot rect bridge and cap. Feel stand by circuit transformer for abnormal heat, sure sign

Mar 12, 2007 | Sony STR-DE545 Receiver

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