Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

[vasce]

Hi all. I attach here the picture of the board where the problem seems to come from.
A wire was not properly connected than I reconnected it and the tv went on showing the
picture but after that only on and odf. It goes off after 10 secs after
plugged the power chord.
I already checked the forum for similar solution but didn't find the right one.
Anybody can have a look to the picture to see at least if the components
are ok ?
Thanks to anybody who will help

[NoobCannon]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

One of the white squares in bottom right will have died.

Altho im a noob at this i just had the same problem myself

[R_J]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

I think he might be refering to the 3 ceramic resistors in the lower left, check and see if one or more of them are open, there value should be marked on them

[vasce]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Thanks NoobCannon and RJ.
I've checked the white resistors but none of them are open.

[Andrew F. Ali]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

If The PSU is making 'clicks' then most likely it is working. There is a procedure to self-test the PSU. Your problem is elsewhere. However there are more knowledgeable engineers on the site. I can share the Self-test procedure, if you like.

[ReeceyBurger123]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Voltage tests at all preformed ?

[vasce]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Hi Andrew. Thanks for your contribution.
Yes, I'd like to know that procedure.
Thanks for your help !

[ReeceyBurger123]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

If you did some research you would know not hard.

[Andrew F. Ali]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Hi Andrew. Thanks for your contribution.
Yes, I'd like to know that procedure.
Thanks for your help !

1. Make a 'Test-Lamp'. The Test-Lamp is 2pcs 120Vac 100W light bulbs connected in SERIES
2. Disconnect ALL Jacks from the PSU
3. Disconnect Main Bd Jack P-301 going to the PSU Bd
4. Using the Main Bd Jack P-301 free end
a. Jumper Pin10-GND to Pin18-Auto GND with an insulated piece of wire
b. Jumper Pin13-5vStBy to Pin15-RL-ON with a 100Ohms resistor
c. Jumper Pin14-5vStBy to Pin17-M-ON
5. Connect one end of the 'Test-Lamp' to VS Test Point i.e. PSU Jack P-811 Pin1 or 2, on the PSU Bd
6. Connect other end of 'Test-Lamp to GND Pin4, 5 or 8, PSU Jack P-811
7. Re-check ALL connections are solid, insulated and not shorting on any other connections and in the correct places
8. Reconnect P-813 on the PSU Bd
9. Connect AC supply to PSU Bd

'Test-Lamp' will glow Bright, if PSU is working.
Measure VA voltage at the Test Point, it should be on-spec (60Vdc?)

[Ltank]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Remove power, wait for voltage to discharge below 5vdc, disconnect the Y and Z board power from the P.S. Then turn on set. It should stop turning on/off. Then remove power wait for PS to get below 5vdc then connect power to Y and re apply power. then try the x board, the board that causes the P.S. to cycle is the bad board. It may or show a real low resistance across the power and gnd pins.

[Andrew F. Ali]

Re: Tv plasma LG50PJ350 click sound on and off. WHO KNOWS ?

Remove power, wait for voltage to discharge below 5vdc, disconnect the Y and Z board power from the P.S. Then turn on set. It should stop turning on/off. Then remove power wait for PS to get below 5vdc then connect power to Y and re apply power. then try the x board, the board that causes the P.S. to cycle is the bad board. It may or show a real low resistance across the power and gnd pins.

PSU Jack P-812 takes M5V, VA and VS to P-210 on the Y-SUS Bd. Then Jack P-211 on the Y-SUS Bd takes the VA and goes to P2 on the Z-SUS Bd. (The Y-SUS Bd does not us the VA)
If the TV clicks and remain ON with P-211 disconnected then X-SUS Bd bad. However if it continues to click ON/OFF the the Y-SUS Bd is the suspect, in which case we will have to consider the Upper and Lower Buffer Bds connected to the Y-SUS Bd