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 !

Friday 29 March 2019

SAMSUNG S22A350H S23A350H S24A350H S27A350H TFT LCD MONITOR TROUBLESHOOTING – SERVICE MODE

SAMSUNG S22A350H S23A350H S24A350H S27A350H TFT LCD Monitor Troubleshooting – Service Mode

Samsung S23A350 – Samsung S27A350 TFT LCD monitor Troubleshooting - Wiring Diagram
Troubleshooting
If the screen is blank, check whether the power cord is connected correctly.
The circuits to check:
When the raster does not appear: The Function PCB, Main PCB
When 5V is generated but a blank screen is displayed: Main PCB
 “Press the MENU button and hold down the, “ (Enter, Source)” button for more than five (5) seconds to return the monitor to factory mode.
When the Power Does Not Turn On
When turning on the Power button after connecting the power cable, the LED at the front of the monitor does not operate.
Check the IC604 power fuse and the IC604 output power.
Check the connections for the CN601 and the Main board inside the monitor.
Check the Main board power part and also check whether there is any abnormal output at any of the other output terminals.
When the screen is blank (Analog)
Even though the LED power turns on, the screen is blank when connecting the VGA cable.
Check the D-sub cable connections.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
When a blank screen is displayed (HDMI)
Even though the LED power turns on, the screen is blank when connecting the HDMI cable.
Check the HDMI cable connections.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
Symptom: HDMI signals are not recognized.
Cause: This error occurs because the PC cannot recognize the mode information since the HDMI DDC is not input to the monitor.
Action: Input the HDMI DDC.
Symptom: A full white screen is displayed regardless of the signals when turning on the monitor.
Cause: This error occurs when only lamp power is supplied and the video signals are not input to the panel due to an LVDS cable connection error.
Action: Replace the LVDS cable or connect the cable correctly so that the video signals can be supplied to the panel.
Symptom: When connecting the DVD, noise occurs on the screen.
Cause: The HDCP key is not inserted.
Action: Enter the HDCP key.
Entering Service Mode
Entering: Menu > Brightness 0 > Contrast 0 > Hold down the Enter button for five (5) seconds.
Exiting: Power OFF >  Power ON
Checking the Code Version
Check the MCU code version and checksum after entering SVC Mode.
Entering SVC Mode
Adjust the Brightness and Contrast values to 0.
Hold down the Enter button for five (5) seconds.
The SVC Function OSD is displayed.
To exit the SVC Function, turn the power off.
Safe Mode When the input signal is higher than the supported frequency of the product, safe mode gives users some time (one minute) to change the video card settings to the Recommended Mode settings.
Service Mode (Moving around)
Press the + button to move to other items.
Press the [ -- ] button to change the setting to On or Off.
When replacing the panel
After replacing the panel, move to the Panel item and hold down the Menu button for five (5) seconds. The Ch. No is incremented by 1 and then both the On Time and Cycle are set to 0.
Wiring diagram
CLICK ON THE PICTURES TO MAGNIFY
Posted By: FRANK at 01:55
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