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No power display on samsung model no ct 3329 v

I check the voltage regulator ok and the unit was wet once last week and could not be on and no standby power thanks ben.

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SOURCE: volvo V70 electrical problem

had the same problem with an s80 this week- no warning lights nothing. was the regulator. when you have it fixed cancel all the trouble codes as when voltage is low everything registrs low signal input and makes the car go into get me home mode.

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SOURCE: Hot water heater Model EE3J40RD045V

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Posted on Apr 24, 2010

SOURCE: Grundig tv Davio T51-3101 TOP.

You either have a Faulty Horizontal Oscillator IC? OR something, on that 1.3 V Output, is dragging that output down and on that output, something drawing too much current, and causing the IC, to not be able to drive to it's full potential, usually 5 V DC in a logic circuit, but if CMOS, then even 12 V DC.
All one can really do, is find the "Cause" of the low output, remove the "Fault" and/or change the IC, too (It's most likely damaged anyway? So I usually do)

You need to get the parameters of the IC & Semi's that you are working with and check the output against what it should be.
Also, you did not indicate if you were using a service manual. If not, then I implore you to obtain one, as without it, one really cannot work effectively.
As I always used to say to my students: Are Your Voltage Correct? Specifically, starting with the PSU, as if this isn't 100%, nothing else can be. Anyway check all voltages around your IC's & Semi's. Also remember the technique of "Cut & Test" too, isolating parts of the suspected circuits, by cutting a trace, or chopping a Leg or Pin, on a Semi or IC, can be useful in tracing where the fault is going. One other thing is Current Measurement, cutting into a circuit, and inserting the Ma meter, into the circuit, will also soon show you where the problem is, reduced current usually indicates a "Short", a high current usually show a disconnection, or "Open" circuit.
Hope this helps.

Posted on Aug 27, 2010

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No display, sound ok

try checking, power supply board out put voltage, if abnormal may be regulator has a problem or change it , or regulator control ic..or checking capacitor leaky and change it in same value.

Dec 28, 2013 | Haier 32 in. LCD TV

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Show all solution to d945plrn motherboard problem not powering up

PSU IS OK? You're sure? You tested the 3 main voltages coming out?

DON'T rely on; "The LED lights are on, and the fans spin, so therefore the PSU must be good.

1) If ALL the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor uses 51 to 125 Watts of power.

With a Power Supply that has a weak voltage power rail, you will see LED's light, and fans spin; BUT not enough power to turn the Processor on.

Power Supply also needs to be plugged into motherboard to test, because you need a Load on the Power Supply.

PSU is KNOWN to be good? I mean KNOWN.
Not, "It's brand new so I know it has to be good"
Okay, moving on.

How did you test it? Install on another working motherboard?

Are the Electrolytic Capacitors on the motherboard good?

Capacitors on the motherboard are used as Filters, and Voltage Regulators.
The ones used as Voltage Regulators are in the Motherboard Voltage Regulator Circuit,

Part of what the Motherboard Voltage Regulator Circuit does, is to regulate voltage for the Processor. (CPU)

The CPU MUST have a steady, 'clean', supply of voltage, and it MUST be kept within the Processor's voltage tolerance range.
Too much, or too little, and the CPU shuts off. BIOS turns it off.

(CPU stands for Central Processing Unit. Another term used is Microprocessor, or simply Processor for short.
I know you are aware, just posting for all those who read the solution in the future)

[Better motherboard due to the Intel Q965 motherboard chipset,

Scroll down to Q965 in left column ]

For additional questions please post in a Comment.


Feb 18, 2013 | Intel D945PLRN Motherboard

1 Answer

I have a Samsung LN32c450 model LCD HDTV and it does not turn on. The red led in the front is on but no display or nothing. I read online a lot about the bad capacitor syndrome a lot of Samsung TV'

When you change the caps check the polarity.Check the diodes,
and the regulators, Resistors,Fuses looks like a transitors
two legs no 3 legs like the transistors get a voltmeter and read the voltage if are there, check the screen voltage.

Nov 04, 2012 | Samsung Televison & Video

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Hi I have a Samsung Tv. Model SP50L6HXX / XSA that wont turn on. there was a week buzzing noise for the last week or two, but tv will not start up now. The lamp light flashes on the front of tv. Can you...

I suspect the B+ voltage on the power supply can't regulate the voltage needed for the lamps to run entirely. The B+ voltage regulator looks like a small black box with a tapered top. This is dangerous to replace so be careful. Once you get a new one installed this will fix the issue you are having.

Hope this helps :)

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Lg lu20-25su1 can not turn on when i press the power on button, the power on led only flash once and gone, nothing happens, no matter plugged with battery or not

Was unit wet or dropped? Try unplugging memory and reloading it, check power at end of wiring to see if their is voltage.

Let us know ok, we will be happy to help you

Nov 23, 2009 | LG LU20 Tablet PC

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67 votage display on generator output.

Please stop making new problem threads each time you answer, instead post a comment to one of the 5 threads you already have open for this problem. It's getting hard to follow the conversation :-)

OK, now to the problem. You say you have checked 67 volts is displayed on the generator output, I think this means that you see 67 volts on the control panel display when the generator is running. This can be several different problems:
a) a bad CT/PT module that tells the controller the wrong voltage
b) a bad A/D module inside the controller itself
c) a bad voltage regulator

Get a real DMM meter and measure the voltages at the top side of the output (large) circuit breaker of the generator. Put the black lead of the meter on the neutral wire and then measure to each of the phase wires on the circuit breaker. If you get normal voltages then you probably have a bad A/D, if you get 67 volts on all 3 phases you have some other problem.

You still haven't told me what model/spec of generator this is, look on the data sticker on the generator cabinet.


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Have to replace ignitor on coleman furnace every year

The voltage regulator on the control module is sending the wrong voltage to the ignitor or the ignitor is getting wet from condensation. That ignitor should last many years. Replace the control module.

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internal fuse, small 2 amp slow blow, check both, some times white coated inside when blows turns brown in middle, voltage spike problem

Jul 25, 2008 | Samsung Televison & Video

1 Answer

TV keeps powering off

Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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