Question about Panasonic PV-C2780 27 in. TV/VCR Combo

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No Sound The sound is shorting out...if you slightley tap it, it will turn on and then any slight movement will stop the sound.

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Re: no Sound

Hi i would like to as
how to get a black diagram of my t,v,,
the model is 20w10p of panasonic..... because one of the i.c is damage and i cannot figure out of the value....
pls.. help me... thanks for how the one how help me...

Posted on Jul 17, 2008

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Re: no Sound

Sounds like a cold solder connection on the audio output ic?? maybe even an audio plug from the deck assy.

Posted on Apr 05, 2006

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No sound but picture fine

It is very simple to troubleshoot any sound problem by checking the followings:
1- Speakers ( Check for continuity)
2- External sound jacks( maybe short circuited or need re-soldering)
3- Sound amplifier IC
4- Sound amplifier IC supply voltage ( Can be tested)
5- Sound mute function ( Check that it is not activated)
6- Volume control
7- Sound settings on the main menu

Jun 08, 2014 | Audiovox Combination Televisions

2 Answers

Akai model ws-p28ntf-sf-d-gb (s) tv/dvd combo

Disconnect it from power cable 30 mins, see if this reset works, for the rest sounds like you have a problem with the power unit.

Mar 28, 2008 | Akai CFTD2083 20 in. TV/VCR/DVD Combo

1 Answer

I have a Toshiba 34HF85, watching it this morning there was a electric buzzing sound and it went off. There is no LED lite in the front, and I can not turn it on. I unplugged it and waited 1...


from your description is about the shorted LOT. LOT or Line Output Transformer, is a stepup transformer, looks like a black cylindrical mass from which normally three wires comes out and one amoung them will be fitted to the top of the picture tube, and the other two's will be connected to it base card. if this transofrmer shorts, there will be no power light and no picture or sound. It is a main and crictcial component in your TV. It can be replaced. But should be replaced with same type and number. you must open your Tv to resolder it out from the circuit board and to solder a new one in place. You must have a concept of soldering and some knowledge in electronics. along with LOY the horizontal output transistor also must be replaced. it is small component with three terminals, can be lcoated very near to the above said LOT, screwed on to a metal heatsink. Jusr replace this transistor first before replacing the LOT. In rare cases, if this transistor gets a leak , the problem you described here will arise. So first buy and replace the transistor. After replacing it, just switch on your TV for a short time, say 10 seconds or so, switch it off and feel if the replaced transistor overheats or not. it may get slight warm, but should not overheat. if overheats, it is clear that LOT has got damaged, and should be replaced. OK.

Mar 19, 2011 | Toshiba Combination Televisions

1 Answer

Need to know what parts to fix it

Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour. Be sure to vote/rate me if this helped Thanks!

Oct 05, 2009 | Philips Combination Televisions

1 Answer

TV making high pitch noise, stop working.

It must be the horizontal output transistor, it maybe short circuited. A short in flyback.

Apr 02, 2009 | Combination Televisions

10 Answers

No sound on tv switch positon. works on dvd

Try reset .

Unplug the unit from power chord for 30 minutes and plug back the power chord to the unit .
This will reset your unit .

Feb 28, 2009 | Combination Televisions

1 Answer

Hissing sound inside my sansui tv

You have a short on the secondary side of the transformer that is hissing. You are going to need someone knowledgeable in electronics, to help you find the short. Most likely it is your Horizontal output transistor.

Sep 08, 2008 | Sansui Combination Televisions

1 Answer

High pitched sound

you can fix this if you are very careful. it is call a high voltage leak. inside of the tv, close to where the power comes in will be what is called a high voltage transformer. if you are electrically inclined, unplug the tv, take the back off and then hook the power line up and turn the tv on. with the lights off in the room and a flashlight handy, look at where the sound is coming from. locate where the sound is coming from and look very carefully(very carefull not to touch with your hands or head to any part) for a white-ish blue arc of electricity. if you can see this then that is where the problem is. to fix it you will need to put something in between the two places that it is arcing from. a piece of plastic or silicon putty or anything non-conductive will work. again, be very careful or you might get the dogsnot shocked out you.

Jan 06, 2008 | Quasar VV-2002 20 in. TV/VCR Combo

1 Answer

Audio shorting out

sounds like a bad connection on the audio output Ic or in the audieo curcuitry

Apr 05, 2006 | Panasonic PV-C2780 27 in. TV/VCR Combo

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