Question about Panasonic PT-51HX40 51" Rear Projection Television
Hey, I have a Panny PT-51HX40 RPTV that is about 10 years old. It worked fine yesterday, now today when I turn it on, it comes on for about 2 seconds, then turns off. I see all the posts replacing the transistors and capacitors, so I am wondering if I should do that to mine?
I am clueless about electronics, but I can solder fine. I have done quite a bit of misc. electrical stuff, but I can not read a schematic to save my life. I do have the factory repair manual with all the schematics, but I cannot find the 3 items that everyone is replacing (Q553,c555 and c556)
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 replug 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. 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.
5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic of a bust capacitor (not same model):
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.
REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.
Hope that helps!
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Posted on Jul 14, 2008
Honestly if you do not know what your doing i would call a repair man because if you touch one wrong thing in a tv you can fry yourself plz becareful messing around with that ...personal i would call a repairman
Posted on Jul 14, 2008
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Posted on Jan 02, 2017
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