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, 18 June 2020

PHILIPS 40PFT6709, LG715G7801 - ELECTRIC CIRCUIT DIAGRAM AND PWB LAYOUT - A 715G6555 PSU

 

Circuit Diagram and PWB Layout - A 715G6555 PSU

 

Ambilight will adjust the TV lights around according to the picture changing color and brightness in order to create a sense of the effect of being personally on the screen

Power Supply Unit

All power supplies are a black box for Service. When defective, a new panel must be ordered and the defective one must be returned, unless the main fuse of the panel is broken. Always replace a defective fuse with one with the correct specifications! This part is available in the regular market.
Important delta’s with the TPM14.2A LA classis platform are:
• New power architecture for LED backlight
• “Boost”-signal is now a PWM-signal + continuous variable.
The control signals are:
• Stand-by
• Lamp “on/off”
• DIM (PWM) (not for PSDL)
No detailed information is available because of design protection issues.
The output voltages to the chassis are:
• +4V7-STANDBY (Stand-by mode only)
• +5V (Stand-by mode only) (for 65PUT8609)
• +12V (on-mode)
• +Vsnd (+12V) (audio power) (on-mode)
• +24V (bolt-on power) (on-mode).

DC/DC Converters
The on-board DC/DC converters deliver the following voltages (depending on set execution):
• +5V-STANDBY, permanent voltage for the Stand-by controller, LED/IR receiver and controls
• +12V, input from the power supply for the panel common (active mode)
• +12V, input from the power supply for audio amplifier
• +1V2, from the power supply for the scaler IC MT5591
• +1V5, supply voltage for DDR2 (diagram B03B)
• +3V3, general supply voltage
• +5V, supply voltage for USB and CAM
• +3V3-TUN, supply voltage for tuner
• +5V-USB, input intermediate supply voltage for USB
• +3V3 from the power supply for the scaler IC MT5591
• +12V input from the Power supply for the Ambilight common.

• Output to the display; in case of
- IPB: High voltage to the LCD panel
- PSL and PSLS (LED-driver outputs)
- PSDL (high frequent) AC-current.
Diversity
The diversity in power supply units is mainly determined by the diversity in displays.
The following displays can be distinguished:
• CCFL/EEFL backlight: power panel is conventional IPB
• LED backlight:
- side-view LED without scanning: PSL power panel
- side-view LED with scanning: PSLS power panel
- direct-view LED without 2D-dimming: PSL power panel
- direct-view LED with 2D-dimming: PSDL power panel.
PSL stands for Power Supply with integrated LED-drivers.
PSLS stands for a Power Supply with integrated LED-drivers
with added Scanning functionality (added microcontroller).
PSDL stands for a Power Supply for Direct-view LED backlight with 2D-dimming.


Circuit Diagram and PWB Layout - A 715G6555 PSU





Posted By: FRANK at 06:22
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