REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Saturday 7 November 2020

REPAIRING / SERVICING TV SAMSUNG UA43J5100 TOTALLY DEAD



Samsung UA43J5100…
The problem is totally dead, the indicator light does not work.


Remove the connector from the PSU to the motherboard….
Plug in the electricity… .. the BL light can light up….
This indicates that the PSU is normal ……
Check the voltage out to the motherboard ..... only use a single 13v

Check the 3.3v standby voltage….
The easiest ……… looking for the test point on the IR remote sensor receiver… ..
It turns out ………   zero….
Check with an ohm meter …… does not show “short” ……
Suspicion …… clogged voltage from the 13v voltage which is lowered to 3.3v for standby …… ……….
Generally using IC Dc-Dc Step Down ……….
The characteristics of the dc-dc sterp down ……… .. are nearby using the “COIL” …… which is also the output of the step-down dc's….


Use an ohmmeter …… .. look for a dc-dc ic whose output is connected to a 3.3v IR receiver… ..
 found it …….
Namely ic OZ3015 …… ..
Look for the ic data sheet .... to find out the "INPUT" pin that connects to 13v….
Input meets pin-2 ...
Check ……. Turns out there is no 13v ……
…







After the  .... lines pcb motherboard …….
Found .... there is a "fuse" that broke on the line from the 13v connector to pin-2 ... ..
This is the first time I've met Samsung motherboards using fuse ........ the most commonly used is the SONY motheboard.


After the fuse is connected ……… the indicator light can come on ……
On-power-on …… .OK …… the sound is there….

But how come the image is blank ????


Check Tcon …… Tcon's fuse also broke….
Check the Tcon input line with an ohm meter….
 …… .short with ground …… this is what causes the fuse to break .......
Tinkering here and there ... it turns out that there is a short SMD capacitor on the 12v input line ...
After replacing the smd capacitor …….
 

 ……… pictures can be present… ..

Conclusion… .fuse on the mother board may also break due to a short 12v Tcon line….

 

 Display: 42.5 in, VA, Edge LED, 1920 x 1080 pixels
Dynamic contrast: 1000000 : 1
Refresh rate: 50 Hz / 60 Hz
Frame interpolation: 100 CMR (Clear Motion Rate)
TV tuner: Analog (NTSC/PAL/SECAM)
SoC: Hawk-MF
Cores: 4
Dimensions: 962.9 x 561.3 x 66.9 mm
Weight: 7.7 kg

Posted By: FRANK at 07:09
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