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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Tuesday 26 February 2019

PHILIPS 20PT6245 REPAIR TIPS CRT TV

PHILIPS 20PT6245 REPAIR TIPS CRT TV

  1. SET DEAD.  MALES HICCUPPING SOUND
Main power supply is available.  Hiccupping stops when desoldering L5563. If so, the problem is in the "Main Supply" line.  No output voltages at the line output transformer, No horizontal deflection.
Reason:  The line output transistor 7421 is defective. 

2. SET DEAD.  NO SOUND.

Check power supply regulator control IC [IC7520].  
Voltages at pins 2,6,7,9&11 are about 180V, and pin 14 is [0V].  There reason shy the voltages of these pins high is because of the output driver pin [11]  has an open load.  That is why, the MOSFET 7521 is not able to switch.  Check and replace the feed back resistor 3523.  Be careful measuring on the Gate of 7521; circuitry is vary high ohmic and can easly be damged.

3.  SET IN HICCUP MODE AND SHUTS DOWN AFTER 8 BLINKS OF STANDBY LIGHT.

Blinking LED [set in SDM mode], indicates error '5'. As it is unlikely that the 'POR' and +8V protection, happen at the same time, measure the +8V.  If this voltage is missing , check transistors 7491 & 7496.

4.  SET IS NON-STOP IN HICCUP MODE

Set is in over current mode.  Check the secondary sensing opto-coupler 7515, and the main supply voltage.  Signal Standby-con must be Logic low under normal operating conditions, and goes to High (3.3V), under standby and fault conditions.

5.  SET TURNS ON, BUT WITHOUT PICTURE AND SOUND.

The screen shows snow, OSD and other Menus are OK.  Blinking LED procedure indicates error [11].  The problem is expected in the tuner.  Check the supply voltages. AS Volt AUX = +5V, at pin 5 and 7 are Ok.  VT supply at pin 9 is missing.  Check resistor 3449 & 3450.

LED BLINKING CODES.
  • When the SDAM is entered, the LED will blink the contents of error buffer.  
  • n Short blinks (n=1-14)
  • When all error codes are displayed, the sequence finishes with a LED blink of 3s.
  • The sequence starts again.
Example of error buffer: 12 9 6 0 0.
After entering SDAM:
  • 12 short blinks followed by a pause of 3s
  • 9 short blinks followed by a pause of 3s
  • 6 short blinks followed by a pause of 3s
  • 1 long blink of 3s to finish the sequence
  • The sequence starts again
Posted By: FRANK at 04:18
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