Question about Sony FD Trinitron KV-28FQ75 28" TV

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TV switches itself from "on" to "standby"even when I hold power button on for a coulpe minutes.

TV will not stay on--keeps switching to standby.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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nfandres
  • 168 Answers

SOURCE: Sony Vega Digital TV model KD-28DX50 U

the symptom is usually caused by a breakdown in the power supply circuit. in most modern receivers (transistorized and/or ic), it may also be caused by a breakdown in the horizontal deflection circuits (hor. oscillator, pre-drive, or drive circuits). supply voltages for the tuner, vif,sif, and vertical output are usually supplied by the horizontal output circuit. but if you doesnt know anything about these stuffs, better bring it to a qualified service technician

Posted on Jan 16, 2007

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SOURCE: TV cut out and stay on standby

hold the power switch in from off for 10 seconds, worked for me.

Posted on Sep 03, 2007

SOURCE: Sony KV-36FS76U keeps turning itself off

My sony trinitron 27 inch keeps blinking in and out, but you can hear the sound. What is ther problem?

Posted on Dec 19, 2007

SOURCE: Sony bravia tv keeps switching on and off

I had the same problem, seems to have something to do with the external aerial socket. I unplugged the aerial and had no more trouble (only a solution if you don't use freeview)

Posted on Nov 03, 2008

ginko
  • 19396 Answers

SOURCE: Standby Indicator flashing SONY KD-32NX100U

If the TV goes in standby, then it is in protection mode.

Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box
connected.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.

1Theinternal circuits are jammed because of electrostaticcharges accumulating on capacitors, or because of a wrong voltage readby the main chip on your monitor controller board. this started theprotection circuit.

2 The protection circuit detected a wrongvoltage or abroken contact, identified an internal fault and kicked in, starting the flashing light.

If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |


On LCD Payparticular attention at inverter and power board, power board can beinspected looking for bulged or leaking capacitors, then tested with amultimeter. The inverter is more difficult to test , there is need toread voltages, should be done by a tech. Also the LCD controller board can cause same problem

On Plasma, test Sustain (Ysus/Zsus) / Buffer boards , cables to plasma, digital board and power board.

On Rear Projection : check lamp, lamp ballast, power board, and convergence.

On CRT TVs, check ballast , flyback transformer, CRT, Tuner, Convergence.

Posted on May 05, 2009

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