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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Friday, 1 February 2019

LGP3739-13PL1 – PART CODE: EAY62810401, EAX64905301 POWER SUPPLY UNIT CIRCUIT DIAGRAM AND CONNECTOR VOLTAGES

LGP3739-13PL1 – part code: EAY62810401, EAX64905301 power supply unit circuit diagram and Connector voltages:

LG 37, 39 and 42 inch LCD TV power supply unit schematic – 39LN549E, 39LN575V, 39LN5300, 39LN5700-UH, 
Used semiconductors: MAP3202SIRH, NR891D, SSCIS311A, MDF11N65B[FET]
On Condition: In a moment of Power ON Signal activated, the current of 3.5V output should be limited within 40mA(Max) at LCD TV condition for stability.
[Do not turn “Power ON” Signal on at the load condition of 3.5V output, more than 40mA]
 Total regulation for each output circuit includes the results of input voltage variation, load variation, warm-up drift and temperature change.
 Maximum input Wattage Rating: Under 85W
 The following instruments shall be used for measuring ripple noise.
1. Probe having impedance ratio of 1:1.
2. Oscilloscope having frequency characteristic of 100MHz or more.
 Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor.

Connector voltages
Click on the schematic to zoom in
Burn-in
More than 2 hours at 45℃(±5℃), Normal input voltage.
AC on/off must be test 1 time after burn-in.
80% Load of specification.
 This Power Supply has above-mentioned protections.
 Short circuit protection between different output terminals is not considered.
 Trip point for over voltage indicates the operating point when the output voltage slowly increases.
 The conditions of Over Current measurement
Multi output (3.5V,12V,24V) is nominal load state except an over current measurement
Posted By: FRANK at 22:45
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