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What causes a power supply fault? - Televison & Video

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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Apr 23, 2015

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Pride pursuit has little power in reverse


I am not an expert on such things but I have had a little experience of a mobility scooter with a similar symptom or fault.

Speed control is by a switch-mode power supply and reverse is by circuitry and relays (or SCR's) that change the polarity of the supply.
The fault on Sam's just-out-of-warranty scooter was caused by an electronic fault in the polarity change circuitry, which was just a small part of the large single circuit board. I approached the manufacturer who told me no repairs were possible and a complete new board would have to be purchased at a huge cost.

I argued the point on behalf of my customer and finally a new board was sent free of charge which put matters right.

I fully expect your problem is likely to have a similar cause, though you might be fortunate enough to be able to obtain circuit diagrams for local repairs, a manufacturer repair or a refurbished board at a reasonable cost.

A possible cause of such faults might be the weakening effect of electricity surges in the supply during battery charging. It would be wise to only charge the batteries when a surge protector is used in the mains supply, such as is recommended for all mains powered electronic devices including computers.

I hope this helps.

May 30, 2016 | Pride Health & Beauty

Tip

UNINTERRUPTIBLE POWER SUPPLY


UPS – UNINTERRUPTIBLE POWER SUPPLY
Uninterruptible power supplies provide protection against mains power faults to computer equipment.
These faults include voltage spikes/interference, over voltage and under voltage, mains supply interruptions and surge protection etc.
These faults can cause computer and electronic equipment that are connected to an unprotected mains supply to malfunction and/or sometimes fail.
A common problem, when burning Cds, DVDs etc. any slight power interruptions to the burning process will halt the recording process and rendered the disc useless.

There two type of Uninterruptible Power Supplies
The lower powered and cheaper type UPS are switch-over types, when the mains supply fails, the UPS switches over to the batteries and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.
NOTE : The mains waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).
The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and then the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.

on Dec 06, 2009 | Computers & Internet

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Sony muteki system has static through every channel on every input selection. Any ideas what could have caused this and how to fault find?


When you get a fault across just about everything on something that has separate channels it's generally connected to something that is common to all channels. Since on a multi channel amp, each channel will have its own amp, it is unlikely to be the main power amp. The most obvious cause would be the power supply. Since there is likely to be only one of them. Because that is what you are looking for, a single part that can affect everything in what amounts to be separate circuits. Noise faults are often connected with Electrolytic Capacitors in the power supply. These are often trouble makers. But also check out any parts in the power supply with a heat sink on them. As sometimes these semi-conductors can go faulty due to much heat.

May 14, 2016 | Sony Audio Players & Recorders

1 Answer

Why does my Teac receiver only light up the volume knob, then shut right back off?


hi sounds like a fault in youre power supply circuit or there is a fault elsewhere causing the power supply to shut down .....u might need expert help .....good luck

Sep 01, 2015 | Teac Audio Players & Recorders

1 Answer

Sensotec 7000e fire alarm


The power supply is bad, which will cause the other troubles. It will need to be replaced by a qualified and certified life safety technician.

Sep 08, 2014 | Home

1 Answer

My Cambridge audio A5 amp has no power why?


The most common causes are in order a blown fuse, perhaps caused by a faulty output stage. Transformer faults. Other power supply faults. Have a look inside you might seen the part that has gone!

Aug 07, 2014 | Audio Players & Recorders

2 Answers

TV NO POWER?


Any bulged capacitors? If so- they caused the fuse to blow. If nothing is obviously showing fault, check the capacitors in the main portion of the power supply for shorted condition. Also look for failed resistors, and shorted TVS

Dec 20, 2011 | Televison & Video

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There is power but tv wont turn on


It sound as if your set is stuck in the standby mode and the cause can be many fold so i'll try and advise you on how to begin your diagnosis.
Two major areas for your attention are the power supply and line output stages. Over voltage or over current will cause the power supply to shut down and we need to isolate the culprit. To elimate the power suuply disconnect HT + feed to line output stage and connect 100 watt lamp from power supply HT+ to chassis (Ground) If lamp lights at reduced brightness and HT+ is Between 100 and 140 volts then power supply is most likely ok. If lamp not lit or running at full brightness then power supply fault exists. Check all electrolytic caps and chopper transistor also check any high Ohmic value resistors (100K or more) for open circuit. If fault not in power supply most likley cause is short circuit line output transistor. You will require a multimeter, soldering iron and the service manual for repairs of this nature. WARNING very high voltages exist in these circuits. Please take care. I'ts the volts that jolt but the mills that kill. Your friends still love you so you owe it to them to keep safe.

Mar 04, 2010 | Samsung Televison & Video

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What does fault code 37,016.43 cover?


The expected power from the supply
is not being drawn. This error may
be caused by a power supply that is
faulty or shorted by some other 50
V device.

Try disconnecting one connector from the power supply at a time. This will determine if another device is causing the error like a print head or the drum heater ect. After disconneting any connector turn it on to see if you still get the same fault. If after turning it on and off and nothing happens then finally change the power supply.

Nov 20, 2009 | Xerox Phaser 8400 Laser Printer

1 Answer

Sony red warning light flashes 8 times


The most likely failure is either the G1 or G2 power supply boards, but it will take a qualified technician who is familiar with this set to narrow down which one is bad. Basically you are looking at a power supply fault, either a component in the power supply has failed or something is loading the power supply down causing the fault.

Nov 29, 2008 | Televison & Video

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