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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday, 7 February 2019

LG55LM6700-UA LG55LM6400-UA LG55LA6200-UA EAY62709002 - – LED TV POWER SCHEMATIC -

EAY62709002 LED TV Power Schematic - LG55LM6700-UA LG55LM6400-UA LG55LA6200-UA – LED TV

LG55LM6700-UA - LG55LM6400-UA - LG55LA6200-UA – LED TV Power Supply Circuit Daigram - EAY62709002
Used semiconductors - HS01G – STR A6059H – UC2843BD1 - STF18NM60N (FET) – RS1505 (Bridge Rectifier)
Firmware Version 1.00a.  Checksum 0x2214.
Power Factor: over than 0.9 at 90 – 264Vac & max load condition.
Power board PCB: 176mm X 270mm X 1.6(T) mm
Component height: Max 15.5mm
Lead Cutting: Max 2.3mm (except HD Max 3.5mm)
PCB Material: FR-1, KB, DS, L, R-8700 CTI-600.
SCHEMATIC
CONNECTOR VOLTAGES & FUNCTIONS
MICOM SECTION CIRCUIT
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.
Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor. (Connected parallel).
Dielectric Strength Voltage 
AC 1.5KV or DC 2121V 1Min 10mA (Test SPEC) 
AC 1.8KV 1 SEC 10 mA.(PSU Mass Production)
Between Primary and All Secondary Circuits.
Insulation Resistance: Insulation resistance shall be more than 8M ohm (at DC 500V) Between Primary Live, Neutral line and Secondary.
Burn-in
More than 2 hours at 40℃ (±5℃), Normal input voltage.
AC on/off must be test 1 time after burn-in.
80% Load (except LED String current: 130mA) of specification.
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 04:03
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