Hi....i have two problem on my panasonic tv....first, can't find channel at VHF-H and UHF band, only channel that using VHF-L was ok. second, i've lost my AV sound, but for tv sound is ok....the picture for AV also good. please someone to help me........what component are in trouble?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
HI. It might be that your set is not equipped for S-band reception.
Some channels are in this S-band. Sometimes, you must choose between H/S band scanning. (The H stands for the normal VHF-UHF channels 2-62. )
1 Press menu button to enter the menu screens for the following optional adjustable settings.choose
3-AUTO SEARCH (Activate to auto search & preset receivable broadcast stations)
-if it don't work change this
4Press menu button to enter the menu screens for the following optional adjustable settings.choose
6-BAND (change the band system for tuning (i.e. VHF-L,VHF-H or UHF).
if VHF-L don't work try VHF-H or UHF and restart all over
In order for the TV to work with the cable box by using a piece of coax and tuning the TV to channel 3, you must make sure the TV is in "Cable" mode on the tuner and not "AIR or Antenna" the frequency maps are different between these types of service and channel 3 cable will not be the same as channel 3 on Air or UHF/VHF.
Often there is an auto program feature on TV's that will "scan" for all available channels, and this should select the proper input type.
Assuming that you tried to tune stations onto the UHF bandwidth and received nothing,Commonly the tuner box is probably at fault and needs replacement. The VHF and UHF signals are split inside the tuner so if you receive VHF fine then UHF should as well unless faulty of course. Some circuits require an external IC to do the switching, but more on the older models. Regards and good luck, JUS004
The GE (actually RCA) 35GT690 uses the CTC187 series chassis. The tuner uses the VHF circuits for cable channels lower then 51 and the UHF circuits for the higher channels. This means that the VHF circuits have stopped working in your set. I usually find that this is caused by a defective U7301 IC in the tuner, the SIP IC labeled CXA1594L. This is a very difficult IC to change and all tuner ground solder joints should be resoldered too, so that should be done by someone with experience in the CTC187 chassis.
a no ufh channels would be a setting in the menu, but when your vhf channels go, the problem is typically the tuner itself, or the band switching ic. could be either. you will need a schematic to know what voltage is supposed to be on the pins.