What kind of chip is L6561D?

The L6561D is a power factor correction chip. Power factor correction can reduce the harmonic pollution of electrical equipment to the power grid and improve the power factor at the input end of electrical equipment.

For the power factor, you can check it.

For the L6561 ddatasheet, you can check out.

fsdm0265

sa7527

tl494ld7535

ld7575

l6561d

sd4844

The circuit is looking for chip materials to make wax materials, and the reputation of friends is pure and slippery.

The 78M05 is also a kind of 78 series three-terminal regulator, the maximum output current of the 78M series is 500mA, the maximum input voltage is 35V, and the minimum input and output voltage difference is 2V (typical, this parameter is also called the unstable voltage).

The main external components are:

Output filter capacitor (this must be, the function is to suppress the self-oscillation, but the capacity should be smaller than the input filter capacitor, generally there are tens of F and hundreds of F can be, the positive pole is connected to the 78m05 output, and the negative pole is connected to the power ground);

Input filter capacitor (positive terminal connected to 78m05 input, negative terminal connected to power ground.) If the input is a unidirectional ripple voltage that is rectified and opened, this input filter capacitor must be available, and the capacity is related to the output current, generally more than 1000 F is appropriate. If the input is already DC voltage and an external protection diode is connected, this input filter capacitor can be dispensed without);

Protection diode (positive to 78m05 output, negative to 78m05 input.) The function is to protect the input voltage of 78m05 from being significantly lower than that of the output when the input is powered off, and this diode can be omitted if there is an input filter capacitor).

Note: The maximum output current of each sub-series of 78 series linear regulators.

78xx series (e.g. 7805) - 1a (for individual manufacturers.

78mX series (e.g. 78M05) – 500mA

78LXX series (e.g. 78L05) – 100mA

78HXX series (e.g. 78H05) – 5A

78PXX series (e.g. 78P05) – 10A

There are more of them, search on the Internet, a lot! Don't ask such questions.

Yes, replace all damaged parts of PFC, including PFC power tube, L6562D and 7 pin output diode and 22 ohm resistor in parallel with it, MOS power tube S pole ohm resistor 4 pin short to S pole think that PFC should be repaired, continue to check the power supply sent to the motherboard CPU tonight, found that it fluctuates between, replace two 1000 microfaract capacitors, TL431 after the fluctuation is very small, install the power board back on the TV, boot everything is normal. I have spent a month for this TV from receiving the information to check the information and purchasing parts reference drawings to really repair it today, and it is really hard work, and I am ready to contribute all the reference materials to you.

When standby, 300V can also work, and there is a power supply when there is a boot signal to receive PFC.

Replying to cuixz's post, why are the landlord's landlords all "foreign???

Hello: It is estimated that your Dell computer LCD monitor has a malfunction problem, and it is recommended that you contact the after-sales department to serve you.

You can call Dell's after-sales service** consultation: fixed** dial 800-858-2969; Call 400-886-8610 from your cell

Provide you with DELL repair station inquiry**: select the after-sales department that suits you after entering

There is no leakage electrolyte at the root of the pin of the 450V 120UF capacitor, if even a small point of leakage is leaked, the capacitor must be replaced; The European resistance is burned out, the general power chip is not guaranteed, the power tube is generally used N-channel MOS tube, the withstand voltage is above 600V, the power is more than 45W, and the ordinary high-power transistor is not suitable for use.

L6561D is the power factor correction chip, 200A6 is power management, and ZD601 can leave it alone for the time being. Now the question is whether the 200A6 has burned out again, whether there is resistance on the G pole line of the switch tube is blown out, and the fuse is not installed, and a 60 100W bulb is directly connected in series to test, which is safer.

Look at the sketch .........Spike absorption, optocoupler, and freewheeling rectification can all be used back to the original, 223 capacitors must be added, 103 to 473 can be, and it doesn't have much impact after trying. Replace the original optocoupler with abnormal output voltage, which may be broken. The freewheeling rectifier output will work intermittently when it is lower than 10V, and when encountering this strange design, it is necessary to add 1 to 2 turns to the transformer.

However, the probability is extremely low, 1% chance, generally 12 to 18v. The DM0565 is extremely well protected, as long as it is not connected to the wrong wire, it will not burn even if the secondary short circuit is not connected. Rest assured to test on the machine.

0565 Application Sketch. jpg

Which is the main control chip of the power supply? Generally, the components near the switch tube are burned, and they can be estimated without a diagram. No more, the last DM0565 changed the primary power supply, peripheral parts, 99% success, I have changed it n times, encountered a burning bad, difficult to repair, directly changed, 10 minutes to finish.

The power management chip has two fronts for L6561D, and the first few are the components he controls; The back is 200A6, and the ZD601 near it can't see the model clearly!

Measure the voltage of the STB terminal (OFF: 0V) to determine whether the MCU boot signal has been sent, if there is, it is mainly a power board problem, of course, it may also be the backlight board at the moment of overcurrent caused by power board protection! This machine is an LG screen, with a unique backlight design, two backlight plates for color output a pair of high voltage, and 11 cores are connected between the two plates.

Only the STB interface is connected, and the no-load output is normal. Connect to several other sets of loads and the output will rise again, as if there is protection.

There is a high possibility that something will go wrong with the power strip...

Agree is a problem with the power strip...