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 !

Saturday, 16 February 2019

SONY SXRD - KDS-50XBR1 KDS-60XBR1 POWER-ON TROUBLESHOOTING

SONY SXRD - KDS-50XBR1 KDS-60XBR1 POWER-ON TROUBLESHOOTING


                                           When troubleshooting a "Unit Will Not Turn On"problems in previous models the Red Power/Standby LED on the front panel, when illuminated would indicate that at least the standby 5V power was functioning.  There is no ted standby LED on either of the two 2005 SXRD models {KDS-R50XBR1 & KDS-R60XBR1}.  There fore the only way to visually check if standby 5V circuit is functioning is to press the On/OFF power button and watching for the Green Power/Standby LED on the front panel to begin flashing.
     The first decision diamond the flowchart asks the question - Does the Green (Power/Standby) LED begin flashing?,  If the answer is 'yes' then know that the standby 5V and TV microprocessor are functioning as the TV microprocessor controls the Green LED.
     The next step is to check if the Green Power/Standby LED Glows Steady Green, continuously Flashes, or if the Red Protection LED begins flashing.
If the Green Power/Standby LED glows steady then the power-on sequence was successfully completed, and the Power Supply system and microprocessor communications are working fine.  If there is still no video displayed or audio heard then, troubleshooting efforts should be turn to solving a video, audio or lamp section defect.
     If Green power/Standby LED flashes continuously, then there is a communication problem between the microprocessors.  In most cases it will be a communications problem between the TV microprocessor on the DSU-Board and the ATI microprocessor  in the Q-Box module.  Confirm that all cables and connectors between the DSU board and the Q-Box module are securely seated and undamaged.  If all the connections are good, then the most likely defect suspect is Q-Box module.  The fact that the unit successfully completes the Power-On sequence indicates that the TV microprocessor is functioning well
If the Red Power/Standby LED begins to flash, then the 'DE' microprocessor has detected a system failure and has placed the unit in protection mode.  The Red power/Standby LED flash sequence (number of flashes between pauses) should be counted and proceed the the indicated protection mode.
     Let's go back one step back,and follow the path of the situation when the Green Power/Standby LED does not begin flashing after the unit receive an 'ON' command.
The first step in troubleshooting a no-Green Power/Standby LED symptom is to confirm that the TV securely plugged into an active AC outlet.                           



     The next step is to confirm application of AC voltage to the G-Board through the F-Board (Main fuse).  Check for 110VAC at CN6014 on the G-Board to confirm AC supply voltage.  If answer is 'NO', then check all the connections between AC power cord and the F-Board for loose connections or damage.  Check the Main Fuse [F6001] on the F-Board.  If all the connections and components are 'OK', replace 'F' Board.
If the answer is 'Yes', then the next step is to check if standby 5V at CN6502 on G-Board (remove ASU-Board shields to access CN6502).  An alternative Standby check point is at the thermostat connector or directly at the thermostat, on the left rear side of the TV [No need to remove any shields].
     If Standby 5V is present at the previously mentioned check points then the Standby Power 5V is functioning properly, and there is a possible microprocessor defect.  In this case, replace the DSU-Board.
     If Standby 5V is not present at the check points then the Standby 5V power supply is not functioning.  In this case, replace the G-board
Posted By: FRANK at 07:34
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