Question about Philips HTS3450 System

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Hts3450 Sound Gone

Ive pulled the boards but cant identify the capacitors for the fix, can you narrow down for me or email photo, any chance ???? I'm desperate, I need for a Movie Birthday Night this Saturday david@realestateguidance.com

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Hts3450 Sound Gone - 907f475.jpg
Here is a picture of the Power Supply PCB. The location of the 470uF 25v capacitors is marked by the red circles. To locate these the two circuit boards need to be separated. Pictured are the replacement 35v capacitors. Thank you to WheatService for discovering the solution. I hope this helps. I went to Radio Shack and got them to do the soldering for me. It cost a total of like $15. The sound works like normal now.

Posted on Oct 16, 2008

  • nathan mesner Jun 12, 2013

    I HAVE A PHILIPS 3450-37B I HAD A PROBLEM WITH THE POWER THE LIGHT WAS FLICKERING ,SO I TOOK OFF THE TOP AND I NOTICE A PIECE WAS MISSING ON THE CIRCUIT BOARD RIGHT NEXT TO WHERE THE POWER IS PLUGED IN.THE # ON BOARD WHERE PIECE GOES IS C936 ANY CHANCE ON HELPING IDENTIFY THIS PIECE?

  • nathan mesner Jun 12, 2013

    THIS ISMY BOARD

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Hi sita72,

Protect is an error code for short and or overload. This will appear once the processor sense a malfunction either on the power supply or on the load (high chance is the output IC). DIY steps are as follow to determine where the fault is : 1. Allow the unit to cool down for an hour. Give proper ventilation and keep away all obstruction from the vent to have a sufficient air flow. 2. Disconnect one at a time the speakers, inputs, from the unit while powering it on.

If the unit back to normal again then you've confirmed that any of the above caused the error code. If #1 is the caused, you have to check also the exhaust fan, clean it as much as possible, replaced if faulty. If #2 is the caused (speaker) check the wire and speakers for short, (input) check the RCA cord for short or replaced if necessary.

If the above simple fix didn't cure the error code, you can try the next steps if you are an electronics enthusiast. Now after removing the cover, you have to concentrate first on the power supply board. Look for bulged electrolytic capacitor. Leaky capacitor will affect the regulation of the supply and will trigger the error code. Look for dry joints. Check it also in the pre-amplifier stage, main output board where a big heat sink is located. Next disable the output amplifier stage by disconnecting the supply. If the unit come out, make some re-soldering on the board, spot the cold solder and dry joints and then try to connect again. If the error code appear again, high chance that your output IC is faulty but still to be confirmed. Using the disoldering pump and soldering iron pull-out the output IC from the board then try the unit. If the error code disappear, confirmed that your IC is faulty.After trying the abovesteps-by-steps guide and still the symptoms persist this is the time for you to send it to repair shop. Remember that your unit has a lot of parts and only some basic steps have done, leave the expert to troubleshoot the entire unit.



Have a nice day!

Thanks for using Fixya.

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When i turn on my Panasonic stereo set model number: SA-CH94M the systems just displays F61 them Goodbye and Shuts down. What is the cause of this and how can it be fixed? A quick response will be greatly...


Hi denty56,

F61 is an error code for short and or overload. This will appear once the processor sense a malfunction either on the power supply or on the load (high chance is the output IC). DIY steps are as follow to determine where the fault is : 1. Allow the unit to cool down for an hour. Give proper ventilation and keep away all obstruction from the vent to have a sufficient air flow. 2. Disconnect one at a time the speakers, inputs, from the unit while powering it on.

If the unit back to normal again then you've confirmed that any of the above caused the error code. If #1 is the caused, you have to check also the exhaust fan, clean it as much as possible, replaced if faulty. If #2 is the caused (speaker) check the wire and speakers for short, (input) check the RCA cord for short or replaced if necessary.

If the above simple fix didn't cure the error code, you can try the next steps if you are an electronicsenthusiast. Now after removing the cover, you have to concentrate first on the power supply board. Look for bulged electrolytic capacitor. Leaky capacitor will affect the regulation of the supply and will trigger the error code. Look for dry joints. Check it also in the pre-amplifier stage, main output board where a big heat sink is located. Next disable the output amplifier stage by disconnecting the supply. If the unit come out, make some re-soldering on the board, spot the cold solder and dry joints and then try to connect again. If the error code appear again, high chance that your output IC is faulty but still to be confirmed. Using the disoldering pump and soldering iron pull-out the output IC from the board then try the unit. If the error code disappear, confirmed that your IC is faulty.After trying the abovesteps-by-steps guide and still the symptoms persist this is the time for you to send it to repair shop. Remember that your unit has a lot of parts and only some basic steps have done, leave the expert to troubleshoot the entire unit.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

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1 Answer

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Hi,

Protect is an error code for short and or overload. This will appear once the processor sense a malfunction either on the power supply or on the load (high chance is the output IC). DIY steps are as follow to determine where the fault is : 1. Allow the unit to cool down for an hour. Give proper ventilation and keep away all obstruction from the vent to have a sufficient air flow. 2. Disconnect one at a time the speakers, inputs, from the unit while powering it on.

If the unit back to normal again then you've confirmed that any of the above caused the error code. If #1 is the caused, you have to check also the exhaust fan(if installed), clean it as much as possible, replaced if faulty. If #2 is the caused (speaker) check the wire and speakers for short, (input) check the RCA cord for short or replaced if necessary.

If the above simple fix didn't cure the error code, you can try the next steps if you are an electronicsenthusiast. Now after removing the cover, you have to concentrate first on the power supply board. Look for bulged electrolytic capacitor. Leaky capacitor will affect the regulation of the supply and will trigger the error code. Look for dry joints. Check it also in the pre-amplifier stage, main output board where a big heat sink is located. Next disable the output amplifier stage by disconnecting the supply. If the unit come out, make some re-soldering on the board, spot the cold solder and dry joints and then try to connect again. If the error code appear again, high chance that your output IC is faulty but still to be confirmed. Using the disoldering pump and soldering iron pull-out the output IC from the board then try the unit. If the error code disappear, confirmed that your IC is faulty.After trying the abovesteps-by-steps guide and still the symptoms persist this is the time for you to send it to repair shop. Remember that your unit has a lot of parts and only some basic steps have done, leave the expert to troubleshoot the entire unit.

Give a thumbs up if you find it useful.

Have a nice day!

Thanks for using Fixya.

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2 Answers

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3 Answers

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Hi,

Based on your description, we can limit the fault to the power supply board and in particular to possibly 3~4 components:
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blown fuse indicate a short in any of these.

As Jaime867 has suggested, in the absence of a readily available replacement board, component level might be the best alternative at the moment. Having posted the most likely culprits further narrows down your troubleshooting. Could you pls post back the part number of the smaller IC either 4 or 8 pins?

Alternately, pls check for the presence of a VDR, it would look like a coin (often green in color or something else) with 2 pins. They have been known to short out also and cause fuse to blow. One possible indicator is chipped or flaked of one side or a hairline crack on top. If it is chip, there would be a silvery color on the inside.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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Email id


As I found somewhere on the internet; there are two 470uF/25V capacitors on the power supply board in the sub-woofer that are the cause of buzzing, crackling and then eventually no sound. Go to Radio Shack and buy two Catalog #: 272-1030 470uF/35V capacitors and change them out. They are in the middle of the Power Supply PCB and are close to the long flat aluminum heatsink. Make sure you match the polarity properly when replacing. Your unit will be as good as new and will proibably last forever now.

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1 Answer

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If you looked for dry connections and found none, there is probably a componet that is intermittant, and these can be tough puppies to troubleshoot, without monitoring the power supply voltages and sittinfg with the unit.

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I'd suspect your power supply capacitors are on their last leg. replace them.  - This was posted by videoguy1742. :   this problem is CURED simply by replacing 2 capacitors inside on the main board. They are easily identified by a bulge on the top end of the capacitors. The capacitors are located between the heat sinks. The size is 6800uf/16v.
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