1 day afte I switch from Comcast to AT&T, I can't turn on TV. Why

That delay is from your cable service, if you are in area that is in a switch digital location that is why your are getting the delay, the cable company may need to come install an amp to fix this problem. charter Comcast and some of the other giants are still operating in switch digital but upgrading every day.

I suspect you mean by disconnecting the box and running it by itself you mean you tried to run audio from your TV by itself? Somehow you need to go through the menu on your TV setup to see if the audio output isn't either turned off or muted. THere may also be a switch on the back of your TV near your output jacks which gives a option of Speaker on or off. If the speakers are on and your TV audio works I would suspect a issue with either your patchcords or the Cable Box. I am not familiar with the Comcast Digital Cable box (I have analog). But you may want to refer to the manual or to them to see if something in the menu may turn on audio for that as well.

After doing all that (whew)... and if nothing works you may have a issue with the TV amp. If nothing is hooked up to the tv (as if you were just watching "On Air" with an antenna and no stereo connected can you hear audio?

Let me know.

Kindly, DAVID

Comcast uses at least 11 different remote controls. I referred to the manuals listed on their remote control page for instructions on programming the three Comcast-branded remote units:

Comcast Universal Remote (Red OK/Select button)
Sylvania LCD TV codes: 20000, 20035, 20043, 20081, 20593, 21593, 21781
Procedure:

1. Turn on the TV.
   
2. Press the TV button once.
3. Press and hold the Setup button until the TV button blinks twice, then release Setup.
4. Enter a five-digit code from the list. If this is done correctly, the TV button will blink twice. If you enter an invalid code, the TV button will produce one long flash and the remote control will exit the program mode.
5. Aim the remote control at the TV and press the Power button. If you have the correct code, the TV will turn off. If not, repeat steps 2-6 with a different code.

If none of the codes work, you can try the code search procedure:

1. Turn on the TV.
2. Press and hold TV. Press and hold Setup until the TV button light blinks twice, then release Setup.
3. Press 9-9-1. The TV light will blink twice.
4. Press and release the digit 1. The TV key will blink twice. Press the Power key.
   
5. Aim the remote control at the TV. Press CH+ until the TV turns off. You may have to press numerous times until the remote control finds the right code in its library. Stop when the TV turns off.
   
6. When the TV turns off, press Setup once to lock in the code set. The TV light will blink twice.
   

Comcast Universal Remote (Grey OK/Select button)
Sylvania LCD TV codes: 0000, 0035, 0043, 0081, 1781
Procedure:

1. Turn on the TV.
   
2. Press the TV button once.
3. Press and hold the Setup button until the TV button blinks twice, then release Setup.
4. Enter a four-digit code from the list. If this is done correctly, the TV button will blink twice. If you enter an invalid code, the TV button will produce one long flash and the remote control will exit the program mode.
5. Aim the remote control at the TV and press the Power button. If you have the correct code, the TV will turn off. If not, repeat steps 2-6 with a different code.

If none of the codes work, you can try the code search procedure:

1. Turn on the TV.
2. Press and hold TV. Press and hold Setup until the TV button light blinks twice, then release Setup.
3. Press 9-9-1. The TV light will blink twice.
4. Aim the remote control at the TV. Slowly Press Power and TV alternately until the TV turns off. You may have to press numerous times until the remote control finds the right code in its library. Stop when the TV turns off.
   
5. When the TV turns off, press Setup once to lock in the code set. The TV light will blink twice.
   

Comcast Digital Transport Adapter (DTA)
Sylvania LCD TV codes:

Adjust the vertical or horizontal hold controls. This is helpful even if regular TV stations come in fine. If your TV has an automatic fine tuning control (called AFC or AFT), turn it OFF. Use the manual fine tuning dial to adjust the picture. If turning OFF the AFC/AFT causes your TV to display in black and white, then leave the AFC/AFT ON. Slide the Power Switch on the Control Deck to the ON position. While the control deck remains ON, turn the TV off for 10 second then back on again. This resets your AFC/AFT so that it will tune in the signal from the control deck.

Move your control deck farther away from your TV. If the control deck is too close to the TV, the control deck may cause some interference.

http://sitesearch.comcast.com/?q=remote+control+tv+codes+&cat=com&con=www&sec=&PageName=Comcast%2BOfficial+Site+'+High-Speed+Internet%2C+Cable%2C+Phone+Service+Provider

Click on your remote and you can download the manuals with codes. Hope this helps

Here's some things to check:
If there are signal splitters on your cable for TV, computer, more than one tv, the signal is getting divided ...every splitter will weaken the signal.
Check for unneeded splitters, also there are splitters that have a wider frequency capability.
Consider upgrading to 2hgz splitters if needed.
Also I think that the more homes that are on the cable tend to make the signal weaker...I don't comcast would fess up to this, but I'm pretty sure it's true.
Make sure all your cable connections are snug and you may want to double check for corrosion etc. on each connection.
I resorted to a signal amplifier on my home. We've got comcast for cable tv and internet, with multiple tv's and multiple computers.
The amplifier (motorola) boosted the signal for everything and we've got way less dropped, frozen pix, black screens and the internet is back up to speed.
Comcast even came out and put a signal strength meter on the in-line to the house and stated it's within their limits... Glad I put the amp on the line..
Give it a try.
K

which maxi fuse gets hot ? # fuse , plus amps The power seats uses a 30 amp circuit breaker ,not a fuse . The horn gets power from the same circuit breaker . . Sounds like something is drawing to much current. Do you know how to use a amp meter to test current flow . Disconnect componets till draw goes away ? How to use a wiring diagram to pin point areas in a circuit to test ?
Is there corrosion on the pins where the seat circuit breaker plugs into ? Reach under your seats an see if one of the seat motors is hot .
DeVille
The left and the right power seat system consist of the following components:
• The seat switches
• The seat relay modules
• The 4 reversible motors:
- The front vertical motor
- The rear vertical motor
- The horizontal motor
- The recline motor
These 4 motors operate independently of each other.
When the entire seat switch is pushed to the FORWARD position, the forward input of the of the seat relay is grounded.
The seat relay module supplies battery positive voltage (B+) with a ground to the horizontal motor, in response to this input. In order to drive the seat forward, the motor runs until the switch is released.
The BACK position works similar to the FORWARD position with the exception that the voltage polarity supplied by the seat relay module is reversed causing the motor to run in the opposite direction. This action drives the seat backward.
These recline switches operate similar but independently:

The seat relay module could be bad , If you don't know how to do automotive electrical circuit testing it mite be a good idea for you to take your vehicle to a qualified repair shop.
Could have diagnostic trouble codes stored as well .
DTC B0846 +5 Volt Reference Out of Range
DTC B0856 Battery 2 Out of Range
DTC B1656 EEPROM Write Error
DTC B1658 EEPROM Checksum Error
DTC B1982 Source/Battery Voltage High
DTC B1983 Source/Battery Voltage Low
DTC B2101 Recline Aft Switch Failed (Eldorado)
DTC B2101 Recline Aft Switch Failed (DeVille)
DTC B2102 Recline Forward Switch Failed (Eldorado)
DTC B2102 Recline Forward Switch Failed (DeVille)
DTC B2103 Rear Vertical Down Switch Failed (Eldorado)
DTC B2103 Rear Vertical Down Switch Failed (DeVille)
DTC B2104 Rear Vertical Up Switch Failed (Eldorado)
DTC B2104 Rear Vertical Up Switch Failed (DeVille)
DTC B2105 Horizontal Aft Switch Failed (Eldorado)
DTC B2105 Horizontal Aft Switch Failed (DeVille)
DTC B2106 Horizontal Forward Switch Failed (Eldorado)
DTC B2106 Horizontal Forward Switch Failed (DeVille)
DTC B2107 Front Vertical Down Switch Failed (Eldorado)
DTC B2107 Front Vertical Down Switch Failed (DeVille)
DTC B2108 Front Vertical Up Switch Failed (Eldorado)
DTC B2108 Front Vertical Up Switch Failed (DeVille)
DTC B2109 Lumbar Aft Switch Failed
DTC B2110 Lumbar Forward Switch Failed
DTC B2111 Lumbar Down Switch Failed
DTC B2112 Lumbar Up Switch Failed
DTC B2115 Recline Sensor Failed
DTC B2116 Rear Vertical Sensor Failed
DTC B2117 Horizontal Sensor Failed
DTC B2118 Front Vertical Sensor Failed
DTC B2119 Lumbar Forward/Aft Sensor Failed
DTC B2120 Lumbar Up/Down Sensor Failed
DTC 2130 Seat Motor Failure

Do your on screen display work when you push menu?

try code 10030 (comcast remote), or codes for daewoo.

bring up the menu screen the tv and auto program the channels this lock out all un wanted and only allow the rf tuner input channel from the box if your using rf cable hook up,if not un plug the unit for 1 min. and try it again.