Nothing looks burnt on the boards, no funny smell. TV worked great this morning. Went to turn it on tonight, nothing, not even a flicker. Found that by unplugging it for a minute, then plugging it back in, it would start to power up, the led's would light up as far as Diode D946, and then the TV would simply shut off. Any help would be really appreciated.
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Re: Won't power up
If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from www.TvRepairKits.com. They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address.
Here are the symptoms...
Primary Symptom: No Audio or Video. Power light will come on briefly then shut off. Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.
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1. Try this - hold the menu button down for 10 seconds. TV
should power up; you will have to turn
off front panel buttons on menu.
2. You can also try a hard reset: Unplug TV from AC mains and remove all cables
from TV. Wait about 30 minutes and re-plug to AC power and redo the cabling.
Switch on the TV and see if it works..
3. Powering down the set or putting it in standby may have
allowed the power supply to cool. Weak capacitors often go out of spec when
they cool, thus preventing a section of the power supply from firing up
properly again. There is a simple trick...just warm the back of the TV with a
hair dryer for 5-7 mins after you have unplugged the TV. Look for the little
areas of holes in the back panel of TV. Use these as your guide at where to use
the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make
sure the dryer is on High heat). If the TV doesn't turn on after you have
heated it up (like it tries to come on but then turns off) you need to unplug
the TV again, this resets it. And repeat those steps till it works. Resetting
the TV after it fails to turn on is the key. Also, just leave the TV on. Don't
turn in off. Since it is LCD, it doesn't take much power...only a few bucks
extra a month for your utility bill.
4. A circuit board may crack about some of the larger
components mounted on it. Try hitting the TV firmly on the side to confirm this. If the picture changes, then you probably have a bad solder somewhere. You can inspect the PCB's for fractures, and then
repair them. It may also be poor soldering that has failed. I would be checking
for these things first.
may be ur tvs lamp side have some problem. may be the lamp over heated and burned. just open its lamp cover ann check it.
also check its power supply input point(near fuse) there is an MOV (used for voltage surge protection) is burned or not. if there is any voltage surge it will get shorted and the fuse will blow off, protect the power supply for any further damage. check the fuse also. if found open then check the MOV. insert fuse only after replacing the MOV.
Deflection Board. Call UED for replacement Board 1-800-648-6657 or CK 3 capacitors on that board cp150 2200uf 16v 114,129 220uf 35v If cp150 is puffed up on top it is Bad so replace all 3 caps. Call Mats for them 1-800-628-1118