IC POWER DAMAGE

If you've replaced the LM4766 ICs and the humming sound returned, there could be a few possibilities to consider:

1. Grounding Issues: Humming sounds in audio systems can often be caused by grounding issues. Ensure that all components are properly grounded and that there are no loose or disconnected grounding connections.
2. Power Supply Problems: The rapid loud hum could be related to power supply issues. Make sure the power supply is stable and within the correct voltage range. Also, check for any issues with the power cables or connections.
3. Filter Capacitors: Check the filter capacitors in the power supply section and around the LM4766 ICs. Faulty or aging capacitors can lead to noise issues in audio systems.
4. Signal Interference: Electrical interference from other devices or cables can sometimes cause humming sounds. Make sure the audio cables are properly shielded and not running too close to power cables.
5. Speaker Connections: Double-check all speaker connections, ensuring they are secure and properly connected. Loose or damaged speaker wires can lead to noise issues.
6. Board-Level Problems: There could be other components on the circuit board that are causing the issue. Inspect the circuit board for any signs of damage, burn marks, or soldering issues.
7. Magnetic Interference: Make sure there are no strong magnetic fields or sources of interference near the system that could be causing the humming sound.
8. Professional Help: If you've exhausted your troubleshooting efforts and the issue persists, it might be best to seek the assistance of a professional audio technician who has experience with Bose systems. They can perform more advanced diagnostics and repairs.

Remember that working with electronics and audio equipment requires technical expertise and can involve risks, including electrical hazards. If you're not comfortable or experienced with electronic repairs, it's advisable to seek professional assistance to avoid potential damage to the equipment or harm to yourself.

Sounds like the wires touching shorted out one of the amp ic's. Would have to get that ic replaced before it will power up again.

1. From what you have described this sound as though the video card ( internal) is defective. Most mother boards have video cards on the mother board.
2. use a know good video card and install it to the mother board > there should be ample slots to install it.
3. The OS (operating system should see the installed video card immediately and install drivers if you see a screen then this has isolated the problem to video.
If you don't see any video then you have a defective mother board.

Hello
Either your TVs internal speaker or its sound output Ic has damaged. You can make sure about which part is damaged through the following sugession.
Just place your ear, very close to the TVs speaker side, and switch on your TV with its front panel power switch, not by the remote control. If you can hear a 'thumb' sound or 'HUM' sound, you can make sure that the speaker is ok. If you hear a 'HUM' sound as describe above, make sure that its sound output Ic has damaged. If the sound output Ic has damaged, sometimes you may not hear any sound at all too.
Connect the TVs audio out RCA scoet to an amplifier, if you have, and try to get the sound through it. If there is sound through an external device, make sure once again that the internal sound output Ic has damaged. Speaker can be checked by a torch cell, connecting its terminals to the two leads of the speaker, with two pieces of wire, just intermittent touch, you can make sure that it is ok or not.
To replace the sound output Ic, you must open your TV, and locate the sound output section inside it. It is easy, to do, just follow the speaker wire, and find it from which point from the main board it orginates. Somewhere near to it, you can loact this Ic.
Before replacing the Ic, just measure whethere there is voltage comes to its supply terminal or not. If there is voltage, and no sound at all, replace the Ic with same type and number without any doubt.
If there is no voltage comes to the input pin of that Ic, check the track leading voltage to that point, and find whether there is any resistor has opend or not. Ok
If you need any further assistance, contact me through Fixya.
OK.

Hello
You haven't mentioned, whether there is sound is Ok or not. Anyway, according to your description I understand that there is no sound too. Assuming this I advice you to replace its tuner. If there is only a white screen, that is a raster only with no grains, tuner or chroma Ic may in trouble. In your case it may be chroma Ic itself. If chroma ic fails there will be no grains. In most of the modern TVs One Chip Micom is used. That 90% of tha sections are integrated to one Ic. Video If, Chroma, vertical and Horizontal Oscilator, sync: circuits, System Control etc. If any of these section inside the said ic fails, replacement of that Ic is the only remedy. You just check the chroma Ic first. If it is fauty, it will heat up more, such that we can't touch it. It will be heated upto 50 to 65 degreeC during operation. But not more. To check this, open the back cover of the Tv, locate the said Ic [it will be larger in size normaly have more than 50pins of connections on both sides; say it as DIL type, means Dual In Line], switch on the tv; without touching its any internal parts, wait for two or three minutes, switch off the set and plug out the mains chord from wall socket; and just touch it with your bare fingers and feel the heat effect. If it is too hot that you can't touch it; it is the faulty. Be caucious during this process. Never touch it with power supply is energised. Keep the power plug out from the socket, before doing anything inside the Tv and keep the children away from you.

Does the fuel line still have 55 PSI when engine warmed up? Any other codes show up?

hi first of all u should check ur transistor connections.Check your Horizontal and vertical output transistors.You should also check the horizontal and vertical yoke connections as well as your low voltage regulators.... if any of these got damaged u should purchase a new one.. but try to purchase with the help of a tv service assistant...thank u!!!
rate me

i exactly dont know whats wrong but if its humming, then its not the problem with any of the fuses.

The IC(integrated CIrcuit inside your phone is damage since it getting wet.the IC that connect your touch screen and and the main processor is damage,the only way is to change the iC quick possible you can sent to their service center and ask them for tecnical support.i your warranty still not expire,i think they can fix for you..Feel free to ask for their support:)

If you get a F61 error when the unit is powered on then the output ic is bad.Subwoofer has the power amp built into it.You may have damaged the IC with a mixup in the +/- speaker hookup and the common ground connection in the A/B box.Seems your subwoofer will need service.