My set originally died with 4 blinks. I replaced the Q501 (2SC5426) and my TV now turns on (no more blinks) but now there's no sound coming out of the speakers. I have the L and R wires connected to the board and I know I'm sending audio because I can hear the sound when I connect external speakers on the "Audio Out" jack. I'm suspecting the IC401 that's on a heatsink. I will measure the Vp to make sure I'm powering the IC.
Is there more to the orginal blinking problem that possibly blew something else? Thanks.
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Re: No sound coming out of the internal speakers
I myself do not have a copy of the service manual to see the transistor that you replaced.
I would use a scope and trace the audio path to see where it is stopping. It is possible that the output IC is damaged, but this is rare. It is very possible that part of the distribution from the power supply is also not working. There may be a series resistor or fuse resistor that is opened somewhere if the voltage is missing. If you replace a series resistor that is opened, before turning on the power find out where the short is that caused the damage in the first place.
Turning on the power after replacing parts, and not verifying and fixing the the cause of the failure will usualy lead to the same parts failing again.
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There is no sound or low volume coming from the television speakers.
Follow this procedure to troubleshoot when there is no sound or low volume coming from the television.
NOTE: Because each of these steps represents a possible solution to this issue, check the television status after completing each step.
Increase the volume of the television.
Ensure the television audio has not been muted.
Ensure no headphones are not connected to the television.
If using a set-top box with a volume control, increase the volume of the set-top box.
NOTE: If the set-top box is connected using an Audio/Video (A/V) connection, ensure that the A/V cables are connected securely to the appropriate video input on the television.
Verify that the MTS settings of the television are set to MAIN or STEREO .
NOTE: If the source device is not set to stereo or is not capable of transmitting a stereo signal, sound may come from one speaker on the TV only, and the volume will
sound low. In this case, adjust or replace the source device.
If the TV has a Simulated effect in the audio menu, turn it off .
Ensure the televisions speakers are not set as the center speaker.
NOTE: Some televisions allow the televisions speakers to act as the center channel speaker when using a multi-channel receiver.
Verify that the speakers are set to ON in the television menu.
IMPORTANT: If the television has audio output jacks and they are connected to a stereo system, then the speakers on the television may be turned off. Some televisions require the internal speakers or the center speaker setting to be off before audio can be sent out to a stereo receiver via the audio out jacks.
Ensure all audio and video cable connections are properly connected to the television.
Test the television using another source like a VCR, DVD player or Blu-ray Disc™ (BD) player.
Reset the television to the original factory settings. To reset your TV to factory settings, turn the TV ON. Then, while pressing the UP ARROW button on the Remote Control, press the POWER button on the TV. The TV will turn itself OFF then back ON.
NOTE: If your remote control does not have a RESET button or the procedure did not reset the TV to the factory default settings, perform a power reset.
If the issue is still unresolved after completing all the troubleshooting steps suggested, service may be required.
The older TV's have a switch in the back what if bumped will cut the speakers off. It is for internal/external speakers. Check the switch & make sure it is set for internal speakers. If that still does not solve it, go to your Menu screen advanced options and make sure the speakers are turned on. If it is and still not audio, then you may have a problem with the internal amp or the audio switcher. Note you will need the factory remote for the advanced options
there is no internal switch inside the tv to fix the problem. have you unplug the tv for 5 minute and see if it reset. if that don't work is in internal circuit sound board unit, sound is a bit difficult to diagnose and fix yourself, Any tv shop can fix the issue under 100 buck replacing the board, or you can bypass the sound by using RCA out put from tv than to an amp OR spend 50.00 and get a computer speakers that has an amprefier built into it and plug it in head phone from your tv and you can control the volume from computer speaker unit. My friend has the almost the same issue that the tv wont change channel by remote or from tv unit itself, so we use cable box and the remote to by pass the problem. I hope that help a bit..good luck!
tart checking the cable connection to receiver, try moving or replacing cables.
If you have a surround with external speakers check surround connection cable and speakers wiring.
If the cables are OK, then the unit may be faulty.
that case the fault can be either the audio board (often audio circuit
is integrated on the main board) , or the sinput output signal board. Also a contact on connection to internal speakers can give you same problem.