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Troubleshooting my tv does not turn on and i want to know the right connection of a power transistor in the tv receiver.and i want to know how can i check whether the line output transfomer and the transformer next to it is faulty or not

Posted by piwo on

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  • Anonymous Jun 04, 2008

    when I press the power button the tv does not turn on but the standby light blinks 9 times. when the problem first started the tv would turn on after pressing the power button a couple of time and after about 2 days then it stopped working all together.

  • nobigtv Sep 02, 2008

    kp-46wt520 will not come on stand by lt bkinks

  • SteveoTivo Jan 09, 2009

    I have no power at all, my wife called Direct TV and they told her to unplug it 15 seconds. It never powered back up the fan works but there is no yellow or red lights. Dose this mean the hard drive burned out?

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Mike Longo

Mike Longo

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Posted on Aug 29, 2007

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1 Answer

Integra 5.3 keeps turning off so TV will not go on. It flips back to standby mode after 2 seconds and screen says check signal cable or check connections. This issue started yesterday with a loud noise...
you most likely have a blown main output transistor or a shorted speaker. first get a mutimeter and set to lowest ohms setting and check for 4-8 ohms ( CHECK IMPEDENCE rating on back of speaker) at the speaker terminal of the speaker. if this checks out then you take the meter and set to DC and place the + / - terminals to the speaker connection on back of receiver then turn on the receiver . notice if you have any dc voltage at any sp terminal, if dc is present you have a blown output transistor. If you are not an electronic tech please refer your unit to a qualified service tech. I hope this helps.

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1 Answer

Sony STR-DE475 receiver ''protect'' problem
The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.

Jul 01, 2010 | Audio Players & Recorders

2 Answers

Jvc 26 inch lcd tv won't turn on
You can try troubleshooting the power supply board. The only thing is it takes a little knowledge in electronics. The power suplly turns the 120VAC into DC. Then filter it and use it to power a Transistor. The transistor switches at a high frequency sometimes up to 200,000 cycle per second, and that drives a ferrite core transformer that distribute power to all the cicuit board inside your TV. You really have to be familiar with electronic components n how they work. If you don't already know electronic my suggestion is checking out electronic books in the local library first. Good luck.

Mar 05, 2010 | JVC LT-42X579 42 in. LCD TV

1 Answer

When turned on amp shuts down and displays power off. what may be the cause?
You have a short in your unit somewhere which is triggering the fault circuit. It could be almost anywhere but more than likely it is an output driver transistor. If they all check OK I would troubleshoot the power supply. Do you get any fault indications on the display? Let me know and I'll see if I can narrow down the search.

hardrocko

Feb 05, 2010 | Pioneer VSX-1015 Receiver

1 Answer

Receiver LED just turns off in 5 seconds
some tvs have a over voltage or over current circuit protection. this is built into the main circuit to avoid further damage to the tv set. Your tv probably has a switching mode power supply and it's shutting down probably due to an over current condition usually a shorted horizontal out transistor, that is why when you replug the ac cord you get the power light indicator come on for a few seconds then turns off. You may have to take the set in to a tech to diagnose the problem or get an idea on the repair cost.

Sep 09, 2009 | Televison & Video

1 Answer

Receiver Shuts Off Only When TV Input Is Used
I think your Receiver is going into protection mode. This happens especiaally when speaker cables are not connected properly. They are either loose or are touching each other or to the body of the receiver or the speaker ha blown.

You are lucky that it has not blown any transistor of your Receiver.

Please immidiately disconnect all your speakers cables and the cable form the mian.
Reconnect only the cable from the main and try to select the TV, it will switch on. If it switch on then you can be sure it were the speaker cables.

Now power off, main cable off, put all the speaker cables back and see if the everything all right.
If you still have a problem, let me know we can futher trouble shoot.
Best of Luck.
Please rate this solution and thanks for using FixYa!

Mar 08, 2009 | Yamaha RX-V596 Receiver

1 Answer

I HAVE AN ONKYO TX SR500 AV RECEIVER WITH A 5.1 BOSE SURROUND SOUND SYSTEM WITH SONY TV. MOST RECENTLY ONLY ONE OF MY SPEAKERS IS WORKING ON MY SURROUND SOUND. ALL WIRES ARE CONNECTED. I CHECKED ALL...
The symptom you described can be caused by any number of things. I always start with the output power transistors which are the first things to blow with a speaker output overload condition. Unplug the power cord to your unit, remove the top cover and use an ohmmeter to check resistance from C to E on all 10 of the power transistors (Q6050 thru 54 and Q6060 thru 64) attached to the large heat sink. Blown transistors typically read <1 ohm, compared to good transistors that are >10k ohms. If you find a bad transistor it will need to be replaced.

Jan 25, 2009 | Onkyo TX-SR500 Receiver

3 Answers

Sharp TV 21" screen with a switch mode power supply.
i have a tv receiver with a problem of no power going to the whole system thiis transistor c3807 and connected to bigger transistor c4458 are gone together with connecting diodes.any solution please?

Sep 19, 2008 | Televison & Video

1 Answer

When powering on the tv, it sounds like it starts the process (green led turns on, can hear relay switching), then it just turns back off again.
I am not familiar with the chasiss of that tv visit the web site of www.samsphotofact.com and see if they can help you with a schematic for your tv or www.repairworld.good luck.

Apr 13, 2007 | Mitsubishi WS48511 48" Rear Projection...

4 Answers

Won't turn on.
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. Could be anything from a bad startup resistor to a shorted horizontal output transistor to a bad controller. It is probably something simple but you will need to do some troubleshooting. Start with the low voltage power supply. Take care, and good luck

Mar 17, 2006 | Emerson EWC1902 19 in. TV/VCR Combo

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