I have a CRT Sony Trinitron XBR with integrated HD tuner. For the last year, the HD tuner has taken longer and longer to start displaying a picture. Now it takes 20-40 minutes to start working. Is this something I could fix myself? I'm reasonably handy with electronics (can build my own computer). If not, could I buy a set top HD tuner and use that. If so, would I use the cable input or just the antenna input?
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Besides the TV as a possible cause, you might want to look at the tuner. I have heard that the digital (HD) tuners provided by cable and satellite companies often seem to do a poor job of tuning in SD channels. Using an integrated tuner or cable card seems to work better, though others could give more detail far better than I on what you'd need to do.
sounds like you have some cold solder or bad joints,power section, inspect it ,with the back off, but be carefull.........i had one that did that...bad connection in solder joint...had to resolder,if you have to resolder,make sure it is unpluged.hope this helped....
Turn it off u leave on to long ur CRT Tube will dies soner.Resolder the FBT,the flyback transformer, the big block of plastic with a red wire with a cap hook to the and the transistor beside it.This transformer is the HV to the CRT to get power.
You will need a model number before anyone can even do any research.
In general, there were never many CRT (picture tube) TVs made with the required ATSC tuner and if your set is 5+ years old, it isn't compatible with digital reception.
This could be a scan amplifier failure, and there is a loss of high voltage to the CRT. Part of the power supply may have also failed. In these sets, if the CRT emission goes low in emission, or the CRT goes defective, the bias supply to the CRT will go in to protect.
An experienced TV service tech can troubleshoot the set and give you an estimate for service. Considering the age of the set, the cost of service may not be worth it.