Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 March 2019

LG BD370 POWER SUPPLY CIRCUIT

LG BD370 POWER SUPPLY CIRCUIT.

LG BD370

278R12 VOLTAGE REGULATOR

Description
The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipment. It provides a constant voltage power source in a TO-220 4-lead full-mold package. The dropout voltage is below 0.5 V in full-rated current (2 A). This regulator has peak current protection, thermal shutdown, and over-voltage protection.

KA278RXXC-Series (33 / 05 / 12)
• 3.3 V, 5 V, 12 V Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
• Output Disable Function
KA278RA05C
• Nominal 5 V Output without Adjusting
• Output Adjustable between 1.27 V and 32 V
• 2 A Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection

STR W6251 SMPS DRIVER

Description
STR-W6200D series are power ICs for switching power supplies, incorporating a power MOSFET and a current mode PWM controller IC in one package. Including a startup circuit and a standby function in the controller, the product achieves low power consumption, low standby power, and high cost-effectiveness in power supply systems, while reducing external components.

Features and Benefits
TO-220 fully-molded package with 6 pins
Current mode PWM control
PWM and frequency modulation functions: reduces EMI noise, simplifies EMI filters, and cuts cost by external part reduction
Built-in Slope Compensation circuit: avoids subharmonic oscillation
Automatic Standby Mode function (Input Power < 40 mW at no load)
Normal operation: PWM mode
Light load operation: Standby mode (burst oscillation)
Built-in Audible Noise Suppression function during Standby mode

Built-in startup circuit: reduces power consumption in standby operation, and eliminates external components
Bias-Assist function: improves startup operation, suppresses VCC pin voltage drop in operation, and allows use of smaller VCC capacitor
Built-in Leading Edge Blanking function
Protection Functions:
Overcurrent Protection function (OCP); pulse-by-pulse, built-in compensation circuit to minimize OCP point variation on AC input voltage

Applications:
Switching power supplies for electronic devices such as:
• White goods
• Consumer electronics
• Office automation
• Industrial equipment
• Communication equipment

LVT817 OPTO COUPLER

Features
Current transfer ratio
(CTR : MIN. 50% at IF=5mA, VCE=5V)
High input-output isolation voltage:
(VISO : 5,000Vrms)
Compact dual-in-line package
LTV-817 : 1-channel type
LTV-827 : 2-channel type
LTV-847 : 4-channel type
UL approved (No. E113898)
TUV approved (No. R9653630)
CSA approved (No. CA91533-1)
FIMKO approved (No. 202634)
NEMKO approved (No. P98101945)
DEMKO approved (No. 307857)
SEMKO approved (No. 9832157/01-03)
VDE approved (No. 094722)
Options available :
-Leads with 0.4"(10.16mm)spacing (M Type)
-Leads bends for surface mounting(S Type)
-Tape and Reel of Type I for SMD(Add"-TA"Suffix)
-Tape and Reel of Type II for SMD(Add"-TA1"Suffix)
-VDE 0884 approvals (Add"-V"Suffix)

Applications
1. Computer terminals.
2. System appliances, measuring instruments.
3. Registers, copiers, automatic vending machines.
4. Electric home appliances such as fan heaters, etc.
5. Signal transmission between circuits of different
potentials and impedances.

POWER SUPPLY SCHEMATIC

CLICK ON THE IMAGE TO ZOOM IN