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I want to know the value of transistors. my Philips TV 25PT4473/69T power supply is blown up. If Circuit diagram could I get

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You have to try in Google search.

If the transistor body is not damaged, you can read the type no. Replace it with identical No. Make sure the diodes and capacitors are not damaged. Check with multi- meter

Posted on Sep 29, 2010

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Diagram tcl21106


If fuse blows off, the power supply regulator section circuit to your TV should be checked in detail. Check all the rectifier diodes first. Then check the main switching transistor for short. The work is a semi skilled one. For more information, check the link http://electronicshelponline.blogspot.com/

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NO POWER AT ALL


Hi
our tv set need to be serviced. Here are some tips:
1. Open main fuse. The fuse is clean but interrupted. You can try replacing it with one o the same value.
2. Fuse Blown or blackened. Short in the rectifier bridge or in the switching transistor. Out of the power supply: supply line rectifier (100/150V) shorted.

Sully

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Westinghouse tv stopped working


Hi

If no standby light is on (red), maybe a blown fuse that can be replaced with a new one of the same value. If the blown fuse is blackened, some componet is bad inside the power supply.
If the fuse replacement does no result, the problem may be in the power supply (IC power supply switching controller, switching transistor, startup resistor or even an overload in the supply line output) which requires a technician to fix it.

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Diagram for psu transistor position 7521


Download the repair manual to this set by internet. It has all details.

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1 Answer

My fuse blew in my Samsung 53" Plasma TV. I changed it, but it's blown again? What should I do next?


The fuse blown because theres a short circuit connection in the PCB power supply of your television.Please check the power supply inside,remove the back cover to see the power supply section.unplug first to avoid electric shock.Will you check the bridge type diode first.If the bridge type diode or diodes is shorted the fuse is always blown.Using digital tester check diodes,regulator transistor,and other transistor around the power supply.

Jul 16, 2011 | Televison & Video

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Completely dead, no power. Is there a power-reset button?


IT SOUNDS LIKE YOU MAY HAVE A BLOWN FUSE, AND HAVE TO CALL PHILLIPS.

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1 Answer

Power supply squeal magna.26MF605W/17


You need a higher capcitor as far as voltage if you got a sag, A power supply making noise is not a verry good sign period and this is dcomming from a eletronics engineer! There is something wroung with the circuit. I would sugges changing out the power supply unit due to a possiable problem with the rails.

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1 Answer

Sony color TV model kv-c29 11d blown power supply ic and transist


There should be circuit designations printed on the PC board. Without those, there are too many possibilities to give you anything useful. Can you provide those please?

Thanks,
Dan

Jan 21, 2009 | Sony Televison & Video

1 Answer

Transistor lost.


if you are replacing 7402
also replace diode 6404 this diode even thou it test goo will in long term overheat 7404 and caus it to go bad by leakage.
and if 7402 gose bad it is regulating the 15v stanby volts that is 7412 is also going to be bad so replace 7412 also
now
the part numbers are:
7402 = # 932211676682

7412 =# 932210514682


thanks,
daniel.

Jan 13, 2009 | Philips 19PR19 19" TV

1 Answer

JVC AV-36260 Is there a fuse in this TV or is it a circuit breaker, if it is where is the fuse / circuit breaker located. I am am electrical engineer, but can not find any specs on the inside of the unit


All modern TV's have fuse devices,some glass,some chemical.

However,a blown fuse comes from a short circuit,which I'm sure

you are well aware.Let's talk diagnosis--What is your set doing

or not doing?? Is it dead?==No "on"?? If there is no bad fuse,the

most common solution is a bad capacitor in the power circuitry

number sequence==900's. Ex..C953    value== 1000mf/35v.

Other caps in power supply may be weak.

2) Check Horiz output transistor---shorted? Look for blown B+

fuse + weak or open C523 1mf/160v in horiz drive circuit.Replace

horiz out with high-quality OEM transistor only.I use JVC only

on 32" size & bigger ( you have 36" ).

  Let me know by rating this solution...thanks...T.

Oct 22, 2007 | JVC AV-36260 TV

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