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Amp won't come out of safety protection mode. have soldered many suspected dry joints and checked voltages on IC502 (Power Amp IC) PLEASE help!!!

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The protection mode is often switched on when an overload has/is happened/happening. This is caused more often than not by faulty speaker wiring or problems. It sounds to me like IC502 might well be the cause, or perhaps a faulty relay if it uses one. But IC's are often to blame, this one might even control the protect mode!

Posted on Jun 04, 2010

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Posted on Jan 02, 2017

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Hi there, do you have the schematics for the Panasonic CT-27sf37b. This TV won't power up but making a high pitch sound near the thermistor area. Thanks.


Hi Richard,


First of all thank you for contacting Fixya.com regarding your TV problem.

You have mentioned that you can hear a high pitch near the thermistor area and the TV won't power up. I've saw also in another link that you already replaced the thermistor but the symptoms still persist. You stated that the thermister heats up, that is normal and not an issue in this kind of symptoms. You can power up the unit even without the thermistor in the board and check if the high pitch will gone or not. But I've suspected that the symptoms will remain the same because the pitch came from the chopper transformer.

I've encountered this kind of symptoms not only on panasonic CRT TV's but almost in all brands. And the major caused of fault is the faulty electrolytic capacitor in the Voltage regulator IC. Your unit used STRF6524 (mounted on the aluminum heat sink) as voltage regulator IC and it has an electrolytic capacitor on its circuitry. I would advice you to replaced it to resolve the issue. The largest electrolytic capacitor is not the suspect here (don't replaced it).

Also check for bad solder joints around the regulator IC. Cracked, cold, dried solder can produced that kind of symptoms. It is hard to spot, you must used magnifying glass and work in the brightest area or much better to re-solder the suspected bad solder joints.

I have various of Panasonic schematic diagram but most of them is a LCD and Plasma TV. I don't have this model no. but please check the chassis no. of your unit and I will try again to find it on my supplier to give it to you for free as much as possible because I've saw it HERE but I don't think the price is reasonable.

Please let me know if you need further assistance.

Again, thank you and have a nice day!

Kind Regards,

Jdvillanueva

Dec 07, 2011 | Televison & Video

1 Answer

Tv sony stop after 20 min standby led flashes 3 times


HI,
By three blink it means the B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is because there is problem in the power supply circuit. Check for any dry soldering in the power supply side. If the tv is working properly for 20 minutes then its sure that there is some dry soldering joints in the power supply side. You have to resolder suspected soldering contacts using soldering ion and solder. The dry soldering joints will look like on in the picture.


ajin_g_109.jpg ok

Oct 06, 2011 | Sony KV-29FX66 29" TV

1 Answer

Hyundai HQP421SR will not power up, red power led lites press power button and green lites but no picture. press power button again but will not go to stant by mode, lite remains green.


This is a fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.


Sep 05, 2011 | Hyundai HQP421SR 42 in. EDTV-Ready Plasma...

1 Answer

Display & color problem


Use a deguassing tool to clear the picture tube in case there was a failure of the deguassing posistor or a lightning flash. If there is no result the fault can be related to a failure in the colour processing section.

This can be the Luminance /Chrominance IC or a simple dry joint. Check the colour system settings( be it PAL/ NTSC/SECAM) before you open the set.

There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Thank you for using Fixya.


Sep 02, 2011 | Sony FD Trinitron WEGA KV-21CL10 21" TV

1 Answer

Rz-32lz55 when tv gets warm it crackles then will loose sound


This is a common fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol.

In this case please check on the AUDIO SECTION/ POWER AMP and the associated sections for the fault.

Aug 20, 2011 | LG Televison & Video

1 Answer

Hi, I have a Fujitsu P42HHS10AS Plasma TV & although I hear a power noise when I plug it in it does not turn on & no lights come on. Do you have any idea what the problem could be & do you sell...


This is a common fault solution which can be checked and corrected by you assuming that there is no component failure . There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Aug 01, 2011 | Televison & Video

1 Answer

The screen suddenly blinks while watching


There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints on the main board.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol.

Jul 20, 2011 | LG 32LG30 32 in. LCD HDTV

2 Answers

My TV standby light keeps flashing for 10minutes then TV will not switch on. Does not respond to remote or the buttons on the TV panel. Please Help


If the standby light flashes but the set does not trigger or come ON, then it is confirmed that this is an error to signal there is a failure of the main section- drivers to the display.
Now the processor is working as it displays the flashing but the feedback error shows that the circuits is not powered due to this protection.
So disconnect the main power+B and check for short in each individual power circuits.
Check for faults on the driver IC or look for suspected capacitors , leaked or top blown.
Also finally check for dry solder joints, solder all suspected joints.

Apr 08, 2011 | Televison & Video

1 Answer

My receiver Now power is automatic turn off



This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling , tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs.
Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.
If the set is going to protect mode then the output section may be faulty.If so check the outputs for short.

Nov 24, 2010 | Pioneer VSX519VK A/V Receiver

1 Answer

Flashes "protect"


I had the same problem. It's a voltage regulator (maybe 7812 or 7912) problem. In my case the problem was cracked soldering joints on the little PCB where the IC was soldered. Try this: open the case; on the sides of the big heatsink are attacched 2 IC Voltage Regulators. Check these ones for properly solder. After that I can power up my amp without problems.

May 27, 2009 | Sony Audio Players & Recorders

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