Question about Hitachi 60V500 60" Rear Projection HDTV-Ready Television
Good Day, egear00;
Try looking at this, since you sound like a TECH;
The Fan alarm is activated when the Fan does not run. This can happen in two different circumstances.
In this situation the fan alarm will be activated. Inside each fan is a hall element that keeps pin 1 of the connector pulled low when the fan rotates. If the fan stops, the pull up resistor connected back to the Fan 12+ pulls the alarm line high. This high is routed through two Diodes to the shutdown circuit of Q905, Q906. When the base of Q905 goes high, it's collector pulls the Power 1 (Power On) command line low which shuts off the relay driver Q903. The purpose of Q906 is to make the shutdown circuit appear like an SCR. If there's any pull up voltage being supplied, (in this case from the Power 1 line), the emitter to collector current of Q906 will keep Q905 in the On condition. This circuit will remain latched as long as the Power 1 line remain in the on condition.
An additional route for the Fan Alarm is out the PPS2 connector pin 9 to Q562. The Fan Alarm high will cause Q562 to turn on and pull the Fan Alarm pin 48 of the Microprocessor low. When pin 48 goes low, the Microprocessor will in turn activate the Temp LED and cause it to Blink. (See the Temp Alarm Circuit for more details).
(2) When the Power is turned off.
When the Power is turned off, the Fans do not run because the Fan +12V regulators I906 and I907 are turned off. This would generate a false Fan Alarm, so the Microprocessor outputs a High from pin 56 to Pin 7 of the PPS2 connector. This high turn on the Fan Alarm Enable transistor Q908. When Q908 is turned on, the collector is held low to prevent a Fan Alarm. This low keeps D916 and D918 cathodes held low.
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Good Luck, big IRISH.
Posted on Aug 20, 2008
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I had a similar problem with my 42 in Philips LCD HDTV.
Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.
Here are some options for you.
1. Have it fixed by a professional $$$$$$$??????? (Is it under warranty?)
2. Open your TV and find PSB. (The board that the power cord plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps replace the entire board. The entire board costs around $250 right now because they are in high demand right now. They can be found at tv-part.com but supplies are limited. I would definitely shop around though.
3. Remove and then replace individual faulty caps. This takes some soldering skill.
Caps kits can be bought online ,are inexpensive and, if you can take care of it yourself it will save you hundreds.
This may be your problem. If you determine that it might be.
I have a Tip/How TO tutorial on this site that may also help. It gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. Here is the Link: Fixing the Philips Turns/shuts off on its own problem. I'm working on uploading pictures to help guide people though the process as well. Let me know if I can do anything to help.
Hope this helps and if it does please rate it accordingly. Good luck.
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