Question about Sanyo DS25390 TV

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There is standby power but no secondary power to turn the unit on

The sanyo tv unit is in normal operation then suddenly it turn off but the standby power is light on,when i turn on again the secondary power it will not work but the stanby power is always on.can i repair that,in what part i trouble shoot the unit?

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Look for the manuals

Posted on Feb 12, 2009

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Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits
The switched output voltage from the power supply is mor than normal. The normal secondary main supply voltage to this set must be around 135VDC. It is now been exceeded that limit, and the overvoltagg; current protection circuits in the set detects this situation and gives you tow blinks as its indication.
Normally, this fault is common to most of the Sony Trinitron sets. The main cuse for this fault is loose solderings at the SMPS power switching section. Just resolder most of the supected solder terminals by applying a little more solder, without making any solder bridge short in between the adjecent solder points. If needy, replace the secondary voltage filter capacitor [the electrolytic capacitor fitted across the 135VDC to ground. This must help you. OK.

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1 Answer

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Check your TVs power supply regulator section for any loose sodering points in it. The regulated voltage comes from it is more thatn normal. Check out all the soldering terminals. It is best to resolder all the suspected solder terminals by applying a little more solder, without making any solder bridge short in between adjecent solder points. The fault symptom as reported by sony is:-Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
Check for any short circuit in the secondary section of the SMPS power supply section. Check the horizontal output transistor for collector to emitter short.

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Hello, it sounds like a power supply problem. When the powersupply in the tv detects a short or a problem it automatically reverts to safe mode or standby. It could be just a resistor or it could be something else. If its just the resistor or similar you'd be looking at around $100. Get a couple of quotes and pick the best. Thank you, I hope Ive helped.

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It sounds like your secondary audio (SAP) has gotten turned on. Look on your TV remote for a button that says MTS or Audio and press it until the screen says Stereo. If you are having difficulty locating how to turn off the secondary audio feel free to repost with the model # and Manufacturer (Sanyo) and we can try to help you further...

Good Luck....

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It sounds like you may have faulty tact switches on the front control panel that are acting intermittently. If one of the switches is defective it can cause all kinds of erratic behaviour.

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Sanyo 25DN1 standby problem

I have over 10 years experience in electronic tech support.

I know this isn't what you want to hear, but the problem you've described can't be fixed with troubleshooting. Your TV will have to be repaired. There is a part that has developed a defect and needs to be replaced. If you're still in warranty, the TV will be repaired at no charge to you. The warranty would likely be at least one year from the date of purchase from the manufacturer. If you purchased an extended service plan they will repair the TV at no charge as well.

If the TV is no longer in warranty, it will likely cost a minimum of $150 parts and labor. This is assuming that you only need a power supply module. If the problem is more than one of the circuit boards, the price of repair could go much higher. I would not suggest or recommend trying to repair the TV yourself.

I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

Please let me know if I can be of further assistance.

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The standby light should be flashing in a repeated count. That is what happens when the set detects a problem and enters a protective shutdown. The blink count will indicate the circuit in which the problem was detected. Please post that count and I should be able to provide you with details.


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That set is probably not ready for the dump yet. The buzzing sound could be the power supply going into shutdown because of a shorted secondary supply, usually a shorted horizontal output. A good tech should be able to fix that at a reasonable price.

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1 Answer

Auto off

make checks in the standby power supply and related tey could be deffected if not make checks on eeprom and the microchip.good luck.

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