Question about Projection Televisions

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Philips LCD HDTV Model 32PF5521D/12 purchased Oct 2006. Intermittent fault when switched ON there is no picture only sound. Switching OFF the TV and leaving for one or two minutes then the TV can be switched on TV and the display is restored. May need more than one attempt to be successful. Please advise likely cause of this fault, Thanks.

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  • needy chap Sep 07, 2008

    I was advised to try a hard reset (disconnect for several hours)but the fault remains. It was suggested that an internal component such as a capacitor was to blame. Is this the most likely cause, or what else could it be? If a capacitor where in the circuitry would this be? Would a complete board need changing? What are the likely costs of labour and parts? Please advise. Thanks.

  • needy chap Sep 09, 2008

    Connections and switch are fine. Can someone respond to my previous questions please?

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Given the fact that most functions of this set are comtrolled by CPUs, a fault in the 5V supply can cause this. Since you have checked for bad connections, I would look to bad caps in the 5V supply. Also, check the set when you have no picture and see if perhaps the backlight is no working properly. To see this, look closely while the set is on and flash a flashlight on the screen, if you can faintly see the picture, there is a good possibilty that the back light is not working. That would bring us to a different set oc circuits.

Update this with your results and we'll continue from there.
Dan

Posted on Sep 09, 2008

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Turn the tv on... shine a flashlight on the screen... do you see anything ?
it does sound like a power supply issue... i fixed a benq monitor displaying basically the same fault.
switch off all power and leave it for about a half hour at least
remove the cover and feel the capicitors on the tops of them.

If any feel rounded you have found the problem. unsolder each one keeping the orientation the same when you replace it. there is strip on the side of the capacitor and has to be installed the same way as the old.
use a low wattage soldering iron and inspect all the solder joints when you are done... make sure you have inspected all the capacitors especially around the power board.

after that resassemble and you should be good to go


Robert

Please take a moment to read over this solution and rate it... thanks

Posted on Sep 09, 2008

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Hello, It seems like you need to bring it to a Tv Repair shop.
If you feel that you would like see if there ant problems inside the
tv for your self . Just take caution that if the TV was plugged in
recently you are going to have to discharge the Capacitor and the because it holds live currents in it . SO just take care not to touch that or the Trans Former . You will need a Voltage Meter to check if there is any charged Amps in the Capacitor. If you have had the TV unplugged for awhile there will be very little Amp/Volts..and if there are none present then it could be blown. It will not smell but if there are blown resistors on the board they will smell.

this site has been tested and is safe
plz go to this link and find the tv www.partstore.com/

Posted on Sep 07, 2008

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If your TV still does not turn on after unplugging , then you will have to retry for a longer period of time. Try longer periods of time such as overnight. And you must unplug the monitor from all connections that can supply power to the TV. It is recommended to remove all connections. If still not working,then it maybe a loose contact or cold solder.
Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the TV turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Hope this may help you;

Regards,
VOTIT

Posted on Sep 07, 2008

  • LORETO LACARON
    LORETO LACARON Sep 07, 2008

    The capacitor in the power supply,check this out;



    Regards,

  • LORETO LACARON
    LORETO LACARON Sep 07, 2008

    . I would concentrate on the power supply section board. Bad regulation of the incoming voltage could caused this issue although,there is a capacitor across the incoming line and nuetral.Maybe its leak or dry up and cause the problems,change it out with one of identical rating .Now you are getting into dangerous area,especially if you have no electronic experience background. It could be also be a loose ,crack or cold solder joint,a blown fuse,fusible links or other component .It could be one of several boards.Unfortunately the level of sophistication on these TV make it virtually impossible to diagnose them further without taking them apart and probing around with a multimeter and other tools.This LCD TV is handy enough to take to a repair shop find a good one.You will probably have to pay $75 to $100....

    Hope this may help you..

    Regards,
    VOTIT

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Hi,
LCD TV is high tech TV and should not be tried to repair at own as inexperienced try can cause more damage. I would recommend to ask Philips Support for nearest service center for proper repair.

Posted on Sep 07, 2008

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This can also caused by a cold solder at printed circuit board.Some experience needed to troublshoot or resold reheating suspicious points of circuit.Better ask help by an electronics technician.

Posted on Sep 06, 2008

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Check for any loose connection or faulty switch operation

Posted on Sep 06, 2008

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Try to do a hard reset. Unplug it for several hours like 2-3 hours then plug it back in. If that didn't fix the problem, there's an internal component that you need to check on the circuit board like a burned capacitor. Check the fuse and the power supply. If you can't do it, you need to contact a tv repair tech.

Posted on Sep 06, 2008

  • Michael Galve
    Michael Galve Sep 07, 2008

    There wouldn't be a point where you need to change the whole circuit board because its better to buy a new unit than to replace the board. The repair cost is around $50. It's not just the capacitor but there might be any other components that need to be visually check for possible replacement if they are burned.

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