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, 15 March 2019

SANYO DS-25204 (CANADA) - POWER SUPPLY [SMPS] - SCHEMATIC [CIRCUIT DIAGRAM]

SANYO DS-25204 (CANADA) - POWER SUPPLY [SMPS] - SCHEMATIC [CIRCUIT DIAGRAM]

SMPS SCHEMATIC
CLICK ON THE SCHEMATIC TO ZOOM IN
POWER FAILURE DETECTOR
This unit is equipped with a power failure detector function included in the CPU which checks for an abnormal condition in the chassis power supplies, including the power supply derived from the horizontal output transformer.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the CPU will turn the unit off in 1.5 seconds to prevent unnecessary damage.
  1. Failure within the power supply circuits.
  2. A short circuit in the load side from the power supply
  3. Stoppage of the horizontal output oscillator caused by the X-Radiation protection hold-down circuit
If while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off the power within 3 seconds.  Check the following of the unit is turned off by power failure indicator.
  • Disconnect the AC power cord [120VAC line] for at least 10 seconds.
  • Connect a DC voltmeter to the following Test Points.
  • Press the power key and check for the proper voltage supplies.
  • If any of these voltages is low, the power failure detector should turn the unit off within 3 seconds.
  • Check all the circuits listed above.
This unit is equipped with a power surge protection feature included in the CPU.  If power failure occurs three times within 15 minutes, the CPU will automatically stop functioning to help to prevent secondary damage.  TV will not turn ON by pressing the power key.  To reset the operating programs within the CPU, disconnect the AC power cord for at least 10 seconds.