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

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Audio shorting out

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

Posted on Apr 06, 2006

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Posted on Jan 02, 2017

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I have a 2010 cobalt lt. Today both my feont speakers quit working. And now my turn signals make no noise. Or the door chime or the seatbelt indicator does not work. What causes this and how do I fix it?...


The chimes an turn signal noise come out driver door speaker . Both front speakers not working could be a blown circuit fuse inside the radio or just blown front speaker channel . Your best bet , take it to a GM dealer or someother qualified repair shop . You have no idea of the complexity of this . The radio can set DTC'S - diagnostic trouble codes , believe it or not !
DTC B1025, B1035, B1045, or B1055
DTC B1025 01: Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02: Audio Output 1 Left Front Circuit Short to Ground
DTC B1035 01: Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground
DTC B1045 01: Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02: Audio Output 3 Left Rear Circuit Short to Ground
DTC B1055 01: Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02: Audio Output 4 Right Rear Circuit Short to Ground

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher.
DTC B1287 01: Amplifier Control Signal Circuit Short to Battery
DTC B1287 02: Amplifier Control Signal Circuit Short to Ground
DTC B1287 04: Amplifier Control Signal Circuit Open

The radio provides a remote amplifier mute output circuit to control overall muting of the remote amplifier. The amplifier receives pulse width modulated (PWM) signals on the control circuit at varying duty cycle percentages for controlling muted and unmuted functions of the amplifier. Circuitry internal to the radio monitors the remote amplifier mute circuit for faults and sets the appropriate DTC when faults are detected.

Feb 16, 2018 | 2010 Chevrolet Cobalt

1 Answer

Sound stopped


Please check to see if the tape is running. It is possible that the tape was running dry and created the sqeak with a static noise over the head. the belt would have failed then and stopped the tape movement. hence without the transport your song is not played. So please check this out. Otherwise it is important to clean the head and check if your amplifier is working. test for voltage and audio tone. if not confirmif the audio amp is faulty and replace. Hope this helps. Good day

Jun 20, 2010 | Olympus Audio Players & Recorders

2 Answers

Protection overload and the system shuts off


check your speaker wires for short, try to turn it on without speakers connected, if all connections and speakers seem ok the problem is internal witch can go from blown power supply to shorted output devices and everything in between , and as always look for repair shop in your area, do not attempt to do it yourself, fire hazard and electric shock are the things we all want to avoid ;)

Sep 02, 2009 | Cambridge Audio Azur 540R Receiver

1 Answer

One speaker channel is crackly.


There is Definately a Short in the Amp if tapping Fixes it. Could try opening the amp and Inspecting the Back side of the Terminals. You can use a Voltometer and check the Wiring inside. Turn off Power Before doing this!

Jan 01, 2009 | Marantz Audio Players & Recorders

2 Answers

Won't stop scanning


L16 Disc coil needs adjustment, Audio is slightly off, and improper noise to DC squelch level detect used to stop scan on active channel. Set to an on freq signal like a NOAA weather channel, and useing a non-metallic tool, adjust to best sounding audio, probably less than a half turn either direction. An on freq signal moduated by 1000hertz, connect scope to speaker and adjust for highest undistorted recovered audio would be better if you could.

Dec 31, 2008 | Radio Communications

1 Answer

Compaq Presario R3000 Sound card problem - I tap on PC to fix


it can be replaced you just have to have the patience to do it

Dec 28, 2008 | Compaq Audio card Sound Card

1 Answer

Poor/fragile connection


Yes, it sounds like the ports may be coming loose, I would attempt to return, if out of warranty, find someone that can solder well, i've replaced ports on external hard drives, not fun.

Oct 20, 2007 | Behringer FCA202 - FireWire Audio...

1 Answer

Sony amplifier problem


I has the exact same problem with the same reciever. It was the neg and positive wires getting too close. Don't join wires together to get the length you want. Make sure you use atleast 16ga wire with NO interconnections. My short went right through electical tape when turned up. ng

Aug 26, 2007 | Sony STR-DE945 Receiver

1 Answer

Sounds don't align with lip movement


if you are saying that your tv has no sound to match the lips movements then you will have to get a tech to repair your tv the problem is in the audio circuit could be a cap or the audio output ic.if you are saying that the tv has sound but it is not syncronizing with the lip movements have your tech check the sync circuit it is possible that the operating voltage is too small to allow the sync circuit to operate.good luck my friend.

Jun 15, 2007 | Westinghouse SK-26H240S Television

2 Answers

No Sound


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

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

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