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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 9 February 2019

HP- LT3200_ HP-LT3700_HP-LT4200_HP-LT4700 _ BACK LIGHT INVERTER BOARD REMOVAL

HP- LT3200_ HP-LT3700_HP-LT4200_HP-LT4700 _ BACK LIGHT INVERTER BOARD REMOVAL

When replacing inverters, first replace the board(s), and then test the unit. If the TV still does not work, replace the inverter cable(s). Inverters are spared as a pair (except for the 32-inch model), so you should replace both. The inverters are NOT the same – there is a Master and a Slave. If you are facing the back of the unit, the Master inverter is on the left side above the speaker marked L (for left).
When plugging inverter cables into the power supply, the Master inverter cable outboard and the Slave cable is inboard. You have to remove the main bracket, but do not have to remove the power supply or main board to remove the inverters.
Note: Inverter board cabling differs based on model.
LT-3200 INVERTER REMOVAL:   [Model LT3200 has only one inverter.]
  • Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and out of the unit.
  • Disconnect the six cables from the connectors on the rear of the inverter board and the remaining cable from the connector on the front of the board.  The connectors have a catch you must push down before removing the cable.
  • Lift the inverter board up and off the unit.
LT-3700 INVERTER REMOVAL
The 37-inch model has different sized inverters, as well as an additional flat ribbon cable from the inverter to the control board.
  • Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and out of the unit.
  • Disconnect the cables from the connectors on the inverter board. 
  • 4 total cables on Master. 3 total cables on Slave.
  • To disconnect fragile flat ribbon cables, disconnect all other cables, grasp the end of the flat ribbon cable, and then pull the board away from the cable.
  • To disconnect the cables, grasp both sides of the cable near the connector, and then pull the cable straight out of the connector.
                                                             MASTER INVERTER
                                                                                    SLAVE INVERTER
  • Lift the inverter board up and off the unit.
LT 4200 INVERTER REMOVAL
  • Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit.
  • Disconnect the 10 cables from the connectors on the rear of the inverter board, and the remaining cables from the connectors on each side of the board.  Grasp both sides of the cable connector and pull it straight from the connector on the board.
  • Lift the inverter board up and off the unit.
LT-4700 INVERTER REMOVAL
  • Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit.
  • Disconnect the 15 cables from the connectors on the rear of the inverter board, and the remaining three cables from the connectors on each side of the board.  15 total cables on each board – 12 on back of board, 1 on each side. Pull the blue tabs straight out to disconnect the cables.
  • Lift the inverter board up and off the unit.
Posted By: FRANK at 02:21
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