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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Saturday, 9 March 2019

SANYO DP50842 SERVICE MODE TROUBLE SHOOTING AND SOFTWARE UPDATE

SANYO DP50842 SERVICE MODE TROUBLE SHOOTING AND SOFTWARE UPDATE


SANYO DP50842 

SERVICE MODE  TROUBLE SHOOTING AND SOFTWARE UPDATE 

 SERVICE MENU SYSTEM
1. Enter the Service Menu
# Turn off the receiver and disconnect the AC power supply.
# While pressing the Volume (–) button on the television, reconnect the AC power supply. The Service Menu will now appear. The remote can now be used to make adjustments
2. Service Adjustments
# Press the Cursor UP and DOWN  key to select the desired service menu item you want to adjust. See page 4 for the On-screen Service Menu.
3 Use the Cursor  LEFT or RIGHT   key to adjust the data. The  LEFT or RIGHT key will increase or decrease the data sequentially.
3. Exit from the Service Menu
# Press the MENU key to turn off the Service Menu display.
POWER FAILURE CIRCUIT
Internal sub_CPU on main IC 5500 is programmed so the set will go to standby mode when there is circuit failure as described below. (Refer to“Block Diagram Power Lines”.) This unit is equipped with a Power Failure Detector function included in the sub_CPU which checks for an abnormal condition in the chassis power supplies.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the sub_CPU will turn the unit off in 1.5 seconds to prevent further damage:
# Failure within the power supply circuits.
# A short circuit in the load side from the supply.
Power Failure: Detected voltage failure for circuit. (Connected to IC5500 pin W7.) (Normal: High; Failure: Low)
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the sub_CPU will shut off the power within three seconds.
Check the following if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for a short time.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: If power failure is detected 3 times in 15 minutes, the set will enter the standby mode and cannot be switched On.To reset the operating programs of the sub_CPU it is necessary to disconnect the AC cord for a short time.
TROUBLE SHOOTING
Green Power LED does not turn on. The TV is dead.
For analog signal board: Is the “5VSTB” working normally?> Unplug(CN2) connector on Power board. On Power board: Is the “5VSTB” working normally? > Power board can not work. Replace “Power board”.
Unplug(K1005) and(K5A) connector between digital unit and analog unit Is the “5V_STBY” working normally?> Analog board can not work. Replace “analog board”.
For digital signal board: Is the “5V_STBY” voltage on “K5A Pin8”? >Analog board can not work. Replace “analog board”.
While pushing the “power”key is the 2.9V from “key circuit” supplied to “K5A Pin18”?> Analog board was broken. Replace “analog board”.
Digital board can not work. Replace “digital board”.
Analog board:5VSTB Test Points
5VSTB on analog board
Analog K8B Pin3
Power board:5VSTB Test Points
5VSTB on power board
Power CN2 Pin3
Digital board:5V_STBY
 5V_STBY on analog board
Analog board K1005 Pin8
Green Power is on, but LCD backlight is not on.
Backlight does not turn on, or only turns on and then off
For analog signal board: Is the “BL_SW” voltage (3.3V) Supplied from “K8B Pin13”?
On digital board: Is 3.3V supplied to”K5A Pin24” ?
For Power board: Is the 0V supplied from “CN3 Pin10” during LED on?
For Power board: Is the +20 sine wave in CN3 Pin 1/2/3” “ and -20 sine wave in CN3 “ Pin 4/5/6”? “
Confirm wire harness connection between analog board &Power board or between Power board and panel .
Green Power LED and LCD backlights is ON, but no video or OSD
For analog board: Is the 12V supplied from “K8B Pin 6/7”?
For digital board: Is power 12V supllied from “K5A Pin5”?
For digital board: Is power 12V to TCON supplied from“K7200 Pin1/2/3/4” ?
Is FFC singal working?
Confirm FFC cable connection and then check video or OSD again.
T.Cnt.Board or LCD panel can not work. 1st:Replace“T.Cnt.Board&FFC Cable”. If T.Cnt.board&FFC cable has no problem, then 2nd:Replace“LCD Panel”.
If FFC singal output is OK, the digital board is normally OK, but can not be sure. If the T Cont Board & FFC has no problem, please try the digital Board before changing the panel.
Main board:"FFC Clock"Test Points
LVDS Clock on digital board
K7200 Pin32 clock+
K7200 Pin33 clock
Power LED turns OFF within 10 seconds after the TV power turns
For analog board: Is 3.3V supplied to“K8B Pin1”during LED power on ?
For digital board: Is 3.3V supplied to “K5A Pin44”?
Unplug cable from digital board to T.Cnt.board whether the symptomchanged?
T Con board can not work. Digital board may also can not work. Replace “T Con board&digital board”.
For power board: Is the 5V supplied from “CN2 Pin8/9 ” during LED power on?
Digital board can not work. Analog board may also do not work. Replace “digital board and analog board”.
STEPS FOR SOFTWARE, MANUAL DOWNLOAD
A. Inspect main PCB version.
B. Be sure of proper connections on all pcb's
C. Connect ac cable to the TV unit and send line switch.
D.Insert USB flash memory,in to USB TV Port.
E. Press Vol - on the TV button unit,and MENU in the RC,at same time.
F. Press enter,wait until " DOWNLOAD IS SUCCESSFUL " blue message appears,press power and disconnect ac cord, wait aprox 15 seconds and connect ac cord again to verify,that new version was correctly loaded.
G. Make sure,new application software,boot versions and opt are correctly after ac off/on cycle was done.
NOTE: For the internal TV CPU sw update,the TV must be ac off/on ofter update process have finished.
The update will be reflected on boot ver.
Posted By: FRANK at 03:08
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