My Sony FD Trinitron TV did samething, started flashing, then eventually went completely black with volume. I got on internet searched found a solution, i tried it, it worked. unplug tv, remove all screws, remove back. towards bottom right theres a transmitter with a couple of knobs, we plugged tv in and moved knobs around and it worked. Also was extremally dusty, we used computer duster for a better connection. hope it helps you
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Video circuit is separate from the Audio circuit. The main controller may switch to Audio, but if the unit is damaged from a power outage; part of the circuit board may not function. Needs professional servicing.
The blue tube might be leaking coolant in the high voltage area, that is the cause of the POP. This repair might not be a DIY because of the lethal high voltage surrounding the CRTs tubes.
The slow response from the remote could be because the coolant has affected the main board where the IR signal are going to the remote sensor.
Let me know if you require further assistance.
The problem with the black box happened to me. I had pushed the subtitle button on my remote by mistake. Interestingly enough, as soon as I pushed the SUBTITLE key again, on the remote, the black boxes disappeared.
It also says CC which means closed captioned-- So the bottom on my remote is Subtitle, and then on the subtitle button is cc...
Contacted Mitsubishi directly and found out that QV9 on the remote control resets to factory defaults, clearing the Parental lock out someone had put in place. The TV is in a Retirement Home and some of the folks are sneaky about wanting to control the TV in their own fashion. We will be watching the remote a bit closer now!
I had the same problem once with my RCA television. It only happened on certain channels and didn't happen during commercial breaks. If I adjusted the volume on the tv the box went away, but came back shortly after. The problem ended up being some malfunction in the closed captioning. I turned it all off and changed the CC settings and never had the problem again.