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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday, 7 February 2019

PHILIPS 30 INCH AND 32 INCH LCD TV – POWER SUPPLY REGULATOR BOARD [SMPS] – SCHEMATIC

Philips 30 inch and 32 inch LCD TV – Power supply Regulator board [SMPS] – Schematic


Main Supply (Block "D")
Diversity
Mains input voltage diversity (1308):
– EU: 198 - 264 V AC.
– US: 108 - 132 V AC (doublers).
– AP multi: 90 - 275 V
AC (auto doubler with AVS10 control IC and triac).
– China: 160 - 270 V AC.
Mains filter diversity:
– EU, China: 1 x mains filter + harmonic coil.
– US, AP: 2 x mains filter + inrush current resistor.
Screen size diversity:
– One module for 30" to 37" sets.
– Two (almost identical) modules on one PWB for 42" sets.
Specifications
• 12 V / 3 A on connector 1304 (for Ambient Light and to generate +8V6).
• 24 V / 5 A for LCD back-light on connector 1304 (for Sharp 12 V, 9 A).
• +18V, -18V sound on connector 1M02.
• +8V6 (derived from +12V from the Main Supply, switched "off" in Stand-by).
• Output voltage: over-voltage protection of resonant supply.
• Output current protection of resonant supply.
• Current protection at some safety fault conditions.
Stand-by mode
• The resonant supply is switched "off" via relay 1450 that is driven by the Stand-by Supply (via connector 1305).
Outputs
• 130-400 V
DC (full range) for Stand-by Supply (connector 1306).
• Mains over-voltage and safety protection for Stand-by Supply (connector 1307).
Inputs
• Relay drive voltage (for STAND-BY/ON mode) on connector 1305.
• DC_PROT signal to protect loudspeakers when there is a DC voltage across the loudspeakers (1M02).
Stand-by Supply (Block "E")
The Stand-by Supply is based upon the "Fly Back Converter" principle. 

Posted By: FRANK at 06:20
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