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 !

Monday, 8 April 2019

INFOCUS IN72 – IN74 – IN76 – INFOCUS PROJECTOR LED FLASHING , COLOR WHEEL FUNCTION,HOW TO CHECK THE THERMAL SWITCH

Infocus IN72 – IN74 – IN76 – Infocus projector Led flashing , Color wheel function,How to check the thermal swItch


Infocus IN72 – IN74 – IN76 – Infocus projector Led flashing – Power up the projector without case – Color wheel function – Choking main board voltages – How to check the thermal switch
Power Up with Top Case Removed
Remove the top case and power up the projector to check fan or thermal switch operation. You also do this to check internal voltages and signals, which may require additional projector disassembly. Here's how to prepare the projector for power up with the top case removed.
1. Remove the top case
2. Use vinyl electrical tape or other non-conductive means to hold the safety switch actuator in the depressed (closed) position
LED FLASHING AND CAUSE 
The projector can now be plugged into a power source and powered up.
The projector communicates its status via an LED located on the keypad. When this status LED is green, you know that the projector is working properly. When the status LED is solid red or flashing red, you know there are lamp, power or startup problems. The frequency with which the status indicator blinks red indicates one of several error codes. These error codes provide crucial information about projector malfunctions.
LED Status
LED flashes green
The projector is starting up after the Power button was pressed, or the projector is shutting down after the Power button was pressed.
LED is solid green
The projector is ready to light the lamp when the Power button is pressed. Or the lamp is lit and the projector is operating properly.
LED flashes red one (1) time
The lamp won't strike after five (5) attempts. Check the lamp and lamp door installations for loose connections.
LED flashes red two (2) times
The lamp counter hours have exceeded lamp life hours. Replace the lamp and reset the lamp hours counter.
LED flashes red three (3) times
Lamp failure. Projector shuts down.
LED flashes red four (4) times
The fan has failed.
LED flashes red five (5) times
The projector is overheating.
LED is solid red
Undiagnosed error. Projector shuts down.
 Check the Thermal Switch
The thermal switch is designed to open when the temperature inside the projector gets too high. When the switch opens, the power supply shuts down, turning the projector off.
When the projector shuts down after operating for a few minutes or when the lamp fails to strike after repeated attempts at startup, check the thermal switch. First, power up the projector with the top off .Let the projector run until it shuts down. Measure resistance across the terminals at the thermal switch. If the resistance is infinite (Ω), replace the lamp housing, which includes the thermal switch.
Check fan operation
You can visually check the operation of the fans to see if they both work properly. Check the fans if the projector exhibits symptoms of overheating or if the red status LED indicates that a thermal issue is present.
To check the fans, first prepare for projector power up with the top case removed .
1. Connect the projector to AC power.
2. Power up the projector.
Warning:
When you start the projector, there is voltage present on the controller ECA and power supply. Be very careful where you probe and where you touch.
3. Follow the directions below to check the fans. The fans should both start up when you press the power button.
4. If a fan fails to operate, check the voltage at the connector on the controller to verify that the fan is receiving power. If a fan has failed, remove the fan and replace it .
AC Filter Board
The AC filter ECA fastens to a metal ground shield plate. The AC filter ECA includes the AC power connector and filtering components that ensure clean power reaches to the other projector components.
The AC filter ECA connects to the power supply ECA. A fuse on the AC filter ECA protects against internal shorts or supply surges. The fuses are not available as a replaceable part. Blown fuses typically indicate circuit damage and the need for ECA replacement
Color Wheel
The Color Wheel is to provide synchronized colored light to the optical engine. The Color Wheel connects to the ECA Controller via a ribbon cable. The Shroud is to provide a direct and uniformed light path from the lamp to the color wheel. The Shroud is fastened to the Lamp Cage. The Index Board reads color wheel rotation to maintain proper synchronization with the DMD and allow accurate image color reproduction
Check Controller ECA Voltages and Signals
1. Make sure the projector is unplugged.
2. Remove the power supply and AC filter ECA.
3. Remove the Shield Plate.
4. Position the power supply and AC filter ECA near enough to the projector to connect the controller/power supply cable from the controller ECA. You can do this if you turn the two ECAs over and connect it to the controller ECA in an upside-down position. This also leaves you room to access the controller ECA with measurement probes. Make sure to connect the AC filter ECA to the power supply.
5. Connect the lamp to the lamp cable connector at the side of the lamp housing. Make sure the connector fully engages the connector on the lamp module.
6. Position the top case right side up at the rear of the projector. Plug the keypad cable in.
7. Connect the projector to AC power.
8. Power up the projector, and check the voltages.
Posted By: FRANK at 02:32
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