Question about Hitachi 60V500 60" Rear Projection HDTV-Ready Television

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Ok...next... Thanks...thanks.... Ok, both fan filters are clean. Power supply is good (I just replaced the entire Power P.W.B. board with one from a working unit). Lamp sensor is good (making good contact on its switch). So...the indication of the TEMP LED blinking could mean could mean what? Or should I worry about what it means? Again...many thanks...

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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.

  1. When the Fan Fails due to a malfunction.
  2. When the Power is turned off. The FAN +12 regulators turn off and the fans quit.
(1) When the Fan Fails:
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.
Ok...next... - click-to-view.gif Click to view Larger Image separately.
Good Luck, big IRISH.

Posted on Aug 20, 2008

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Fan has started to run constantly and very noisily can i fix this myself


  1. Clean the CPU fan.
  2. Clean the power supply fan.
  3. If the noise persists and can be narrowed down to the CPU fan, replace the CPU fan.
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Hi Julia,
Your unit missing some output voltage(s) in the power supply section. This is commonly caused by open/shorted voltage regulator IC, open fusible resistor, leaky/dried electrolytic filter capacitor in the power supply section. You can't fix this kind of problem if you don't have necessary tools and test instrument, don't know safety precaution. But good news, you may replaced the entire board for your convenient. Click the link below to have an idea how much money you are going to spend on the board.
http://shop.ebay.com/i.html?_nkw=LG+32LG30&_sacat=0&_odkw=Harman+Kardon+AVR+2500&_osacat=0&_trksid=p3286.c0.m270.l1313
http://www.shopjimmy.com/catalogsearch/result/?q=LG+32LG30.
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The main problem are 4 bad/defective capacitors
1. 22uf 400v
2. 47uf 50v
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4. 22uf 35v

You can find them near the PWM IC controller (U601). Replaced all these capacitors regardless they look good. I pulled them out off the board and tested them with my Blue ESR and capacitor tester and found 3 were defective.

Next, you need at least 97% Isoprophyl alcohol and toothbrush to clean the soldering paste. Due to overheating on the primary section / HOT section the soldering leads tend to produce brownish paste which is causing the component parts to SHORT. Concentrate at the back of the board, especially at the U102 (16-pin IC) and Q202 transistor by scrubbing them carefully. I used magnifier to make sure the legs are clean and shiny. Clean the rest of the back and some part on top of the board. Let it dry for 2 hours at least. I did 2 times this cleaning to complete the process.

b) The Main Board

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Roan Mac
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1 Answer

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If it's bad replace with the same type fuse. You can bring the fuse to Radio Shack for identification or look on the power board next to the fuse holder for fuse amperage.
If you would like a repair please contact me at PRMHELP@EARTHLINK.NET
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