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 !

Thursday, 14 March 2019

SONY KDL32EX SERIES LCD TVS - HOW TO TROUBLESHOOT THE POWER SUPPLY SECTION

Sony KDL32EX series LCD TVs - How to troubleshoot the Power supply Section

Applicable to Sony KDL-32EX301 KDL-32EX500 KDL-46EX400 KDL-32EX400 KDL-40EX500 KDL-46EX500 KDL-40EX400 KDL-40EX501 KDL-46EX501 KDL-40EX401
Power [SMPS] Troubleshooting
110VAC is applied to the G2LE-Board, G2HE-Board, or GD2-Board it can be measured at CN6101 or CN6003. In the standby mode the AC power passes through the main fuse F6101 or F6001. The is no main relay on the G2LE & G2HE-Board so the AC power is applied directly to the Main & Standby Power supply. The GD2-Board does have a Main AC Relay.  The AC power passes through R6003 (Inrush resistor), and D6001 and is applied to the Main DC/DC Converter IC6501 and the Standby DC/DC Converter IC6201. IC6501 is not active in the standby mode. However, IC6201 is active in standby mode and outputs STBY 3.3Vdc as long as AC power is applied to the TV. The Standby 3.3Vdc is supplied to the TVMicroprocessor, Switch Unit (Power Key), and HSR-Board (IR Sensor) in the standby mode.
Once a ON command is received form the remote controller or the power button on the Switch Unit the TV-Microprocessor outputs the Power-ON signal. The Power-On signal is applied to the G2LE-Board, G2LE-Board, or GD2-Board. On the power supply board the Power-On signal switches the 19V from the standby power supply to activate the PFC and Main Power supply IC6501. No relay click will be heard on the 32” or 40” models because there is not a main relay. However, on the 46” models there is a main relay and one relay click is heard at power-on. The relay engages to bypass the inrush resistor R6003 during the ON state.
The main power supply IC6501 is now active and outputting all secondary supplies. The 12Vdc secondary is the supply voltage for all the voltage regulators on the A-Board. The AU12V is the supply voltage for the audio output amplifier. The 32” and 40” models power supply will also output 24V which is the supply voltage for the backlight inverter board.  The GD2-Board in the 46” models will develop and output the backlight high-voltage (1KV) to the Balancer board and the CCFL backlights.
No Power/Dead Set (No RED Standby LED)
In a dead set condition there will be No RED Standby LED illumination in the Standby Mode (TV plugged into an active AC Outlet).  The following bullet list gives the possible failures for a “No Power/Dead Set” condition.
> Loss of AC Power
> Loss of AC-OFF-DET
> Loss of Standby 3.3Vdc
> Loss of REG12V
> Loss of Power-On
> Defective Main Microprocessor
The first step in troubleshooting a “No Power/Dead Set” condition is to confirm that 110ACV power from an active AC outlet is applied to the G2LE-Board, G2LE-Baord, or GD2-Board. AC power is applied to, and can be measured at CN6101 on the G2BE-Board or G2CE-Board and at CN6003 on the GD2-Board.
Next, check for the presence of the AC-OFF-DET voltage at CN6401/pin 2 or CN6150/pin 2. If the AC-OFF-DET circuit is working properly 3V should be measured. If the 3V is not present replace the G2BE-Board, G2CEBoard, or GD2-Board. If the 3V in not present either the main fuse or the main power supply IC6501 is defective. In either case, replace the power supply board.
After confirming the AC power and AC-OFF-DET, check for a defective Standby 3.3Vdc power supply IC6201. To confirm a defective IC6201 check the 3.3V secondary voltage at CN6401/pin 1 or CN6150/pin 1.  As long as AC power is applied to the TV IC6201 should be active and outputting 3.3Vdc. If the 3.3V is not present then IC6201 is defective.  Replacing the power supply board will fix the problem.
Finally, a “Dead Set” condition can be caused by a defective microprocessor IC400. The microprocessor outputs the Power-On signal which activates

the switch Q6301 and IC6301 on the power supply board and passes the 19V from the Standby power supply to active the relay (46” models), PFC, and Main Power Supply IC6501. If the Power-On signal is not output after receiving the Power-ON command the power supply board circuits remain inactive and a “Dead Set” condition exists. The Power-On signalcan be checked at CN6401/pin 3 or CN6150/pin 3. It should measure approximately 3.3Vdc If the measurement is 0Vdc before shut-off the TV microprocessor is defective. Replace the A-Board. If the power-on voltage is 3V before shutdown then the switch circuit on the power supply board is defective. Replace the power supply board.
G2LE-BOARD & G2HE-BOARD CONNECTOR DIAGAM: 32” & 40” POWER SUPPLY SYSTEM
46 inch POWER SUPPLY SYSTEM
Posted By: FRANK at 02:55
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