TV repair tips and reviews,tutorials ebooks and tools

In my last post I talked about a universal power supply that's gaining ground on my area. I laid my hand on it and had used it to repair some power supplies that would have been rendered useless. One of such power is that used in a double door refrigerator

To connect the module,neglect the green wire.connect the black wire to the negative terminal of the electrolytic capacitor (400v100uf).For the red wire do not connect to the positive of 400v100uf that's where some people get it wrong but instead as shown in the picture below connect to the other positive terminal on the sm transformer that linked to the power ic or power transistor depending on the type of power supply you want to repair but remember to cut the terminal away from the board

Before switching on reduced the output of the power supply through the variable resistor on it so after switching on you can increase to your desired valued this is to prevent the main board from damage due to excessive voltage.

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power supply

How to connect the universal power supply module

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Though this universal power had been around in my area for quite a while now but a lot of technicians did not take cognisance of it including myself but some had tried it out and that's why I decided to check it out myself.

The result was really appealing especially when I use to repair some type of boards. One of such board is a digital power supply board used in a double door refrigerator and an electrically powered screw driving machine that also has a power fault
I hope to bring the way I connected it and makes it work perfectly in my subsequent post so watch out!
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power supply

Universal replacement power supply module that can repair almost any kind of power supply

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The LG home theatre dvd was brought in by a friend and he complaint that whenever he insert disc the message on the dvd player is error disc.
This brand is the original type and has a quality pickup lens that last longer because when such fault occur the main suspect is the lens,however the spinning rotor may also be bad and it may bring about the error disc fault. Unless for cracks or bruises you cannot detect a faulty lens with bare eyes so the best thing is to change it.

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I decide to change the spinning rotor first and see if the fault will be resolved before changing the lens.My decision was right and replacing the spinning rotor clears the fault.

dvd player repair

LG Dvd player cannot read disc

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The TV is an old model CRT tv and when tested it makes a hissing sound,initially I thought the flyback transformer is bad but when I checked the output transistor I detect its faulty.I replaced it but about 10s of powering the tv on this transistor got burnt again.I test the voltage at the output transistor collector terminal and it was over 220v instead of 130v.When such situation occurs it is adviceable to check the power supply circuit and from my troubleshooting I detect this 50v47uf capacitor to be defective

I changed it along with the output transistor and the tv works perfectly when tested.

crt television fault repair

Panasonic TV: horizontal output transistor blows off frequently

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The model of this dvd is shown below

The dvd is dead but there is no burnt components on the power supply board. Checking the supply output to mainboard the p-on/off gives a vcc of 3.3v while the stb is 5v but the dvd fails to power on. The p3482 ic is located at the secondary side of the power supply board and the voltages that will start the mainboard comes from this ic

This ic is not available in my area so I ordered it online

I replaced the ic and this is the dvd working perfectly. I have 3 of this dvd with me with the same fault and I had repaired 2 by changing this ic,it remains 1 with similar problem.

dvd player repair

P3482 dc-dc converter ic in LG home theatre dvd player

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electronics review

BUY 32 INCH HD LED TV FOR N39,990

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The TV is a China made LG tv and are common here in my country. People buy this TV because it is brand new and very cheap compare to buying the original type.
One of the fault common with this tv is showing only red colour on the screen as shown in the picture

The stage to quickly go to is the video amplifier board at the tube base replace the drive transistors along with the drive resistors if need be. Instantly the fault will clear away.

crt television fault repair

Red Colour on Screen LG Tv Problems

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When repairing dvd power supply we get easily fed up after checking and replacing suspected faulty component but still no positive result. Due to the fact that this power supply is cheap in the market we just replace with a new one but today I want to direct you to these resistors when next you are troubleshooting this power supply probably it may be that it is the culprit blocking the power supply from working.

As seen above the resistors are of the value 2.2M or 1M and are always located at the position shown in the picture above. If you use the analog multimeter it may be somehow difficult to detect if the resistor is bad because most of this meter cannot read very high resistances but you can detect it with digital multimeter and that's why I like using the digital meters.
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Do you know the resistor color codes offhand? If no you can download the chart online or drop your email in the comment box so I will forward a highly comprehensive chart to you.

electronics component tips

Checkout these type of resistors before condemning a dead dvd power supply

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The major feature that differentiate smart tvs from ordinary Led and Lcd tv is that it has an inbuilt wifi which enables it to connect directly to the internet and gives the user the opportunity to connect with friends and associates through the social media platforms like facebook,twitter,skype and the rest directly on the tv.
One of the cheapest smart tv presently in the market is the Polystar led smart tv and comes with this amazing features
*Ability to stream youtube videos on the screen so there is never a dull moment with this tv
*Connect with friends and family on social platforms like twitter,facebook,skype and the rest
*Perform red eye reduction,photo cropping and more using the picasa app
*The tv is DLNA certified so you can easily stream videos,images and tunes from anywhere in the household