Panasonic was everyone’s choice in the past because they offered TVs that were the best in their market for decades. The Panasonic company started with CRT models. Today, the factory offers a nice selection of large-screen televisions, excelling as the most energy-efficient TV brand.
What indicates Panasonic tv red light? Why?
My Panasonic TC-55CX400U once had its red led light turn on and respond to the remote, but the screen stayed black.
Panasonic usually makes pretty good TVs. So it might be worth fixing. The procedure to solve this issue is a bit complex and long.
First of all, test all pins on the connector from mainboard to powerboard on powerboard side, all board connected. Don’t remove the connector. You can use a pin to touch through the upper portion of the connector to the pins. You can try disconnecting one at a time. Disconnect the ribbon cable going from the tcon to the panel and notice the changes.
Standby test. Then supply power report both conditions, example: pin 1 bl-on=0 volts standby and 3.3 powered on, report results for every pin. Follow and make a note of any changes to the PINs. Check for similar labeling on the main card that provides other possible signals/voltages that need checking.
Further, the bottom board should see the 12v somewhere towards it. The fuse is usually on the board, which should also be checked.
The cables on the bottom go around and connect to the edge board attached to the panel. Disconnect one at a time. Check the resulting display to see 12v somewhere on the icon as that voltage comes from the main card to power the tcon and more. As for the main, the voltages go from the power board to the main. You can trace visually or with a meter or possibly look for labeling on the card.
Icon fuse will start with F. It looks like F104 or something close. It’s white, close to the left connector. Check meter set at 20 Vdc, black probe to ground, touch the red probe to each side of the fuse, looking for about 12 volts on each side. Also, unplug the cable from the power supply board to the mainboard as suggested, then plug tv, in turn, it on to see if backlights come on and stay on.
If you look at your icon, there is a vcom point and vref. Check those, especially vcom. There might be others labeled, so look at those, especially the panel cables. Further, your “hold the power button for 10 sec “… potentially is a type of “force on” for Panasonic… at least that is what is used in their plasma sets…. usually the system then may flash an error code after that, but it appears that is not happening for this model… maybe. Further, other connectors/voltages are going to the backlights and other places on the power board. Check those, especially going to the backlights.
Check the voltages to the backlights since you get a flicker or flash. Perhaps the LED driver circuit is shutting down due to an error on the LED in the panel. There would generally be a large voltage, sometimes above 200V DC.
Panasonic tv won’t turn on the flashing red light.
Panasonic TV does not turn on when one presses the power switch on the set. There is a blinking green light. Then it goes solid. The display comes on and goes off 3 times, then it goes off completely, and the power light slowly flashes red continuously. If the power button is kept on hold and turn it off and back on, it does the same as above. When the display is on, there is a noticeable noise from the inverter board that is only audible when the screen is illuminated. It goes off and back on with the screen.
The noise is quite a high pitched noise and quite loud
Edge-lit tv, But backlights do go on these as well.
Check the LEDs using a led tester from the connectors first without taking them apart first. Also, check voltages at the led inverter there.
It seems for 3 blinks
A -board P -board
Mainboard generally gets the good old cracked joints on the BGA chip for this model. Remove the heatsink on the mainboard, heat the BGA chip with hot air, see if that temporarily fixes your issue. Often when the mainboards go wrong, they won’t self-diagnose properly and then won’t throw the correct error codes or won’t throw an error code at all.
10 blinks on Panasonic th42pz85u is the SOS code for over-voltage. It is commonly a bad diode. Some have reported a Zener diode ZD302 which stops the 15v rail from starting.
Check and see if ZD302 is shorted, but it is not necessarily the issue. It could be anything setting off an overvoltage issue.
According to the Panasonic Training Manual – 11th Generation HD Plasmas Troubleshooting 10 blinks Condition At Plug-In
These are the 3 conditions that can cause the TV to shut down and the power LED to blink 10 times.
1. Miss/Short in F_STB_15V
2. Miss/Short in SUB9V, SUB5V, and SUB3.3V
3. Wrong diagnostic by the Aboard
Sometimes, when checking your appliances, you need the exact voltage to make sure that the circuit is not damaged. Using a voltmeter is necessary for this task. It’s important to take the voltage reading from a known point.
Before testing, the voltage meter should be held with the probe parallel to the ground, test point, or connector’s pin. The aim is to take an accurate reading before turning your TV off. To troubleshoot a PDP TV that shuts down and the power LED is blinking 10 times:
- First of all, confirm The P board may be defective if V15 is not output by pin 7, 8, or 9 of connector P6.
- If the F STB 15V voltage is OK, it is likely that the A board is defective.
- It’s possible that one of the smaller boards connected to the A board may cause the unit to shut down and blink the power LED 10 times.
- Disconnect the K board from A1/K1.
- Disconnect connector A/52 to isolate the GS board.
- Disconnect the connector labeled A11/GH11 on the power strip to isolate the GH board.
- The defective power board is the main cause of a TV model not turning off or going into standby mode. If the connector that provides the sub-voltages to that board is not removed, the TV may eventually shut down with unexpected results.
- The F+15V found on the P board provides power to the DC-DC converter in Aboard. This A board outputs exact voltage values (9V, 5V, 3.3V).
- The Aboard only uses the 9V.
- The 5V, besides being used in the Aboard, is also distributed to the K and GH boards.
- The A board uses 3.3V, and the GH and GS boards also use 3.3V for anything that needs power.
- A blinking code from the power LED indicates a potential issue with electricity in your house. If any of these voltages show an abnormal measurement, don’t hesitate to contact the company for assistance.
If a televisions TV turns off and the power LED blinks 10 times, then these 5 conditions may have caused it to do so:
1. Missed/Short at F_STB_15V
2. Short at P15V
3. Missing/Short at SUB9V, SUB5V, and SUB3.3V
4. Missing/Short at Vda (Shorted Vda causes 5 blinks)
5. Wrong diagnostic by the Aboard
The same circuit creates the P15V and the F_STB_15V in the power supply circuit. A short P15V typically causes the TV to shut down, and the power LED blinks 2 times. An issue with the Power Supply Unit (PSU) or a shorted P15V affects the F_STB_15V will just shut down without any warning. As soon as it stops being stressed, this symptom will also disappear.
- If the SC board and the SS board indicator lights are lit, then these boards are OK. If both of these lights are not lit, there may be a problem with either the power or communication lines. If this is the case, disconnecting one of these boards and re-verifying their status will allow for only one board to continue driving (either P6 or P7)
- If one or more of the LEDs on the SS or SC boards are unlit, isolate them one at a time.
- If the SS and SC boards are fine, the P board may be defective.