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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Wednesday 30 January 2019

SAMSUNG LED TV - UN46D6003SFXZC, UN40D6000SFXZA, UN40D5500RF – SMPS CIRCUIT DIAGRAM

Samsung LED TV - UN46D6003SFXZC, UN40D6000SFXZA, UN40D5500RF – SMPS circuit diagram


PSU Schematics. PD46A0_BSM (BN44-00422A) PD46A1_BSM (BN44-00423A), BN44-00458A
Models: Samsung UN46D6003SFXZC, Samsung UN40D6000SFXZA, Samsung UN40D5500RF 
Using: SEM5025(SMPS control IC), FSFR-1700XSL, TK8A50D(FET), D2011K
PD46A0 BSM (BN44-00422A)
PD46A1 BSM (BN44-00423A)
The output to excite the LEDs behaves like a current source of 300mA approx.
It means that the current tries to be constant and it is the output voltage that varies. This can down even to 118V.
When there is not enough loads in the exit, the source of LEDs has hiccups. (From 800 ohm approx.)
The hiccup manifests like this: the Drive LED + se activate and rises to 322V (completely without load).
At that time the whole source is turned off, with a voltage high (3V approx.) by pin 9, which immediately returns at 0.1V. Notwithstanding the source Drive LED + delay seconds to restart. The sample of OVP (Over Voltage Protection) comes to the integrated by leg 12.  But if it registers short, it is completely inhibited, both Drive LED +, as Drive LED - (0V in both outputs), and as soon as the short disappears, the source restarts.
When registering short, pin 6 goes up to 11.2V. The 14 goes down to 2V.  The maximum current is around 0.33A, when the exit of Drive LED+ is so minimal, that it only exceeds by 3V to the input source.
100-240V 50 / 60HZ 2.5A
A5V 5.3V / 100mA
B5V 46A0 5.3V / 2.9A
B5V 46A1 5.3V / 3.5A
B13V 46A0 12.8V / 1.49A
B13V 46A1 12.8V / 3.17A
VAMP 12.8V / 0.29A
Led Driver (TOP1 +) 255V / 308MA)
Model N46A0 PSLF121A03A, 46A1 PSLF151A03A
If the voltage at pin 13 drops to 0V, the source Drive LED + is suspended. If the 116V exist, the LEDs they lower the brightness but they do not extinguish.
That means the Drive LED- is still active Without RL it delivers fluctuating 315. Drive LED + works, but
Drive LED- is suspended.
Posted By: FRANK at 08:30
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