LG 50PK350 PD01A TV: No Picture, Remote Control Missing, Voltage Issues, and Troubleshooting Steps

Hello,
The topic is about the LG 50PK350 PD01A TV.
Unfortunately, the remote control was not delivered to me, it turns on and off from the local keyboard, the diode blinks after pressing any key.
Unfortunately, there is no picture.

Main changed, after switching on the logic D1 does not light up, the quartz wave is correct. Measuring with the meter the voltages coming from the dog coincide with the set values, only on the oscilloscope you can see the pins and noise on all voltages. Without a load it is even worse, the T901 and T902 are also audible.

I eliminated the cold February, the electrolytes were checked. The report shows that the fault appeared gradually.

I will be very grateful for your help in finding the fault.

With understanding, because it is useful in the diagnosis of damage (manual, voltage measurements and autonomous mode)
https://www.elektroda.pl/rtvforum/topic2436427.html
https://www.elektroda.pl/rtvforum/topic2428702.html
Link_about 2010.info plasmach.

ps
After all the signal inputs (VGA, HDMI, Scart ...) you have the same?
Is there audio?
You have nap. Vs (206V) and Va (60V) compatible with the sticker for the PDP50R10100 panel?

Quote:

Vs - 208V
Va - 60V
- Vy - (- 198V) * measurement on Y_sus, there is produced e.g. NCP1203 + field_uk. DC-DC converter powered from Vs
Vsc - 135V * as above
Vzb - 100V

Those famous 22ohm 5W in the control line Vs

Quote:

- Control Board EBR63528905
- Zsus EBR62294202
- Ysus EBR62294102
- YdriveTop EBR62293902
- YdriveBottom EBR62294002
- XR Left BT EBR63522205
- XR Center BT EBR63522105
(Main Board) EBT60942404 / also EBT60942403, EBT60942404,

Quote:

No picture

Measuring waveforms with an oscilloscope on Y_out (scany) or on X_out ... would explain a lot.

I started with the measurements, I have a manual (unfortunately there is no power supply diagram). The links from the electrode you sent me, I saw. I did not find AUTO_GEN on logic.
The voltages measured with the multimeter agreed with those on the sticker, but I was concerned about the sampling, so I soldered the PSU, checked all the electrolytes on the power supply (capacity and esr). 2x 150u and 330u were on the low side, but the replacement did not change anything. Of course, all fuses have been checked.
I ordered the main- no change.

I started to take a closer look at the PSU, the tension is pulsating behind the gretzes. It looks like a 7Hz square with 90% fill (10% saw blade). Next there are two mosfets and here the pulsing on the first one looks like a gretz, while on the second one, in place of the pulse, you can see a very large amplitude noise.

So I am asking for advice on where to look next - whether pwm and general cargo or something else.

PS: I did not check the signal inputs (no osd). The client claims that audio is and has been there all the time since the problem appeared, and that the defect appeared gradually, as he claims - after switching on the image did not "surprise" occasionally, but after restart it worked flawlessly. Later it was more and more difficult to start the TV, finally the picture stopped turning on.

Quote:

I did not check the signal inputs ( no judgment )

(' ')

See on the Lvds cable (manual useful) as with nap. constant and mileage on RCLK + / and RCLK-

_____________________
Remember that the scans are powered by + 5V and VDDH voltage with pin "s IC scans (e.g. R2A20291FT) of about 100V
Ohm measurement on IC R2A20291FT her pin ", 43, 44, 53, 54, 105, 120, VDDH
he will also say a lot about the mass.

Sample Mileage Y_out 100V / div

X_out


Descriptions on LG panels


Caution:
Vzb measured on X_sus (Z) other on Y_sus,
If the PCB markings are only in one place (you measure in terms of mass),
-if signed e.g. + Vy it must be and MARKED point. as -Vy (usually in LG outlined with a white line)!


Read the TRAINING MANUAL for LG plasms (it is in the forum database, I think it helps)

Vzb- 15V (horizontal line)
Vsc- 158V (horizontal line)
Vy- -186V (horizontal line)

RCLK + / and RCLK- I do not know if I will have time to check today.

PS-6421-2-LF power adapter
EAX61392501 / 10
P / N EAY60968801

LOGIC
LGE PDP 091013
BOARD 50R1_60R1_CTRL
P / N: EAX61300301
REV J
LOCNO: 1XXX

EBR63526905

You have low Vzb (from X_sus), this is how it results from your measurements.
Read the LG 50PJ350 training manual (also on elektrotanya.com) what and how to do in this case.

If you write PSU, you are ok, that is
- on the PFC IC (R2A20117) you have a stable 390V
- the primary power supply on the IC801 L6599AD produces Vs / Va
- Infineon 3BR1565JF is energizing
- Vs / Va voltage controler on IC F4316MSF17 (i.e. MC81F4316M) works



you have damage:
-or in X / sometimes it attracted Y-sus (mainly field IGBT)
-Logic

You can check the scans (alternately disconnecting ... the bottom / top image should appear)
CHECK before on ohms (described in the manual)

Datasheet org. he is gone, he is close to his brother
Link_ICE3BR1465JF
* after a small modification, replacement with the popular FSDM0565R

Photo of the bottom of the power supply board

Ok thanks a lot. I will come back to the topic on Mon. and I will pass the report.