HItachi Model 42HDS69 Stuck in Standby

Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

be Shure your 2 cooling fans are running

Hello,

there are several things that could keep a set from coming out of standby mode. It could be a defective power supply or a defective main board. You will need to have the set diagnosed to see why and which board is causing the problem.

It means either a power supply issue inside the set or something else pulling the supply down.

voltage tests of power supply board are first step.

Hi I have same problem as you but with different brand of tv, now is all good, if you open your back tv see there board connect to your on /off button on tv or find where is on/off button on your tv, try follow where is the wire going to the board,there is 3 cappacitor in mt tv said 470 uf 25 V your tv could be different size. the capacitor doesnt look bulge or bad but i just change it cost me aus $ 2.10.and work straigh away. hopely this help.
regards.

these particular tvs are very sensitive to voltage changes spikes etc.first turn off main power switch wait at least 30 sec if standby come on wait another 30 then turn off main power again and unplug tv for 1 min then plug in turn on main switch wait 30 sec then turn on tv with remote resets system.then buy a ups and always wait at least 30 min after turning tv off to turn back on if not causes power failure and after each press of power button wait 30 seconds before trying again lmk good luck

Hi, two things.. Either your remote needs new batteries, or you need to switch off your tele and allow it to reboot for a few minutes before switching it back on, I hope this helps

do you know what board they said it was ..mine is =doing the same thing as well after a power surge

vertical red line on screen - I have a Hitachi plasma 42HDs69