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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Wednesday 27 March 2019

LG PJ350 PLASMA _ Y-DRIVE BOARD SECTION - EXPLAINED

LG PJ350 PLASMA _ Y-DRIVE BOARD SECTION - EXPLAINED






Y-DRIVE

  • 42PJ350 uses 8 Driver Y-Drive Board works as a path supplying the Sustain and Reset waveforms which are made in the Y-Sustain board and sent to the Panel through Scan Driver IC’s.
  • The Y-Drive Boards receive a waveform developed on the Y-SUS board then selects the horizontal electrodes sequentially starting at the top and scanning down the panel. Receiving Logic scan signals from the Control board synchronizes scanning.
  • The ICs on one Y-Drive Board commonly called “Y-Drive Buffers” but are actually Gate Arrays.
 Y-DRIVE _ KEY POINTS
  • There are 6 FPC (Flexible Ribbon Cables) connecting the Y-Drive board to the Panel.
  • These FPC connect to a total of 768 individual electrodes determining Vertical resolution.
  • If the connector P106 is removed and the unit is powered up with the lugs for Floating Gnd and Scan making contact with the Y-SUS board, the Y-SUS or Y-Drive or both boards will fail.
  • Floating Ground is delivered to the Y-Drive board by 4 screw lugs.
  • Scan is delivered to the Y-Drive board by 1 screw lugs.
  • The Y-Drive board operates from Floating Ground, (no reference to Chassis Gnd).
  • Floating Gnd 5V can be measured across C18 or C523 surface mount electrolytic capacitors.

Y-DRIVE LAYOUT
  • Warning: Never run the Y-SUS with P106 disconnected. You must remove the Y-Drive board completely due to these FG lugs.

  • Connector P106 does not come with a new Y-SUS or Y-Drive.
  • Y-Drive signal (VSC), FG5V Volts from the Y-SUS board and Logic Signals from the Control board through the Y-SUS are supplied to the Y-Drive Board on Connector P106.
  • The Floating Ground Standoffs deliver FG to the Y-Drive Board. There are 4 total.
  • The VScan Standoff delivers the VScan signal to the Y-Drive Boards. There is per/board.