Hitachi 55PD9700 sound no picture

First thing to check is mute, if its not muted then you have an issue with the main board or power board..without the model I don't know if the voltage for the sound circuitry comes from the power supply or if its processed in the main board.

I don't know how to fix your issue but I have the same tv with a cracked glass front. I would be interested in buying your tv for parts to replace my glass front if you are unable to fix yours. Please let me know. Thanks, Dan
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Go to Hitachi.com and put in the model# of your tv. The manufactruer has made it to where you the comsumer can change the lamp yourself. Use a vacume to clean out any dust. Hope this helps.

Hi, when I open it got the sound but no picture?

Hi, do you still have sound. Can you control your volume. It might be one of your sustainer boards. Please let me know. It could be your SDR boards too.

Bad buffer board, Let me know if I can help. lone99star

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

It sounds like the tuner demodulator has failed. Many times I have found that it is cheaper to buy an external hi-def tuner than repair the one that is in the set. The fact that the tuner is finding channels but not displaying them is a good sign that the demodulator has failed. In one case I had with Sony rear projector, it would have been $800 to repair the internal hi-def tuner and the customer can buy an external tuner for $100-$200. Sorry if this is not the answer you wanted; if you fel this si a good response to your question, please be sure to rate me,. Thanks!

TV always has high voltage shock risk while repair. As you said you are not familiar with TV repair so better to handle repair person this issue.

If you hear the unit comming on and theres no sound or Picture, then theres a fault in the horizontal sweep/HI Voltage circuit. This should not be fooled with unless you know the safty issues with HI voltage as theres voltage in these sets even after they are unplgged for a while. Good Luck

It probably has a broken mirror or somethings inside the set blocking part of the pic. Now for ther picture all red. If your not a tech I highly advise you going insidew this . Unless you know about the saftey issues and the HI voltage issues. Your problem could be a shorted Picture tube all the way to na bad distribution block . Good Luck