Lg plasma 42PQ60 relay clicking

[ponyboy689]

I've done most of the test that's outlined in the training manual from lg. and i came to the conclusion that something is wrong with my mV5, it seems the relay clicks constantly when this used in the circuit. When there's no load it works, Can this be a main board problem ?

There's one test where i'm trying to test the control board, put a jumper from pin 10 of p811 (m5v) to pin 10 P201 (5v), i can't get this to work because my relay keeps clicking. I'm losing m5v when there is a load.

[tom66]

Re: Lg plasma 42PQ60 relay clicking

One way you can test this is by applying a load to the M5V, for example with a 10 ohm resistor (5W rated); power should be disconnected from the main board.

[ponyboy689]

Re: Lg plasma 42PQ60 relay clicking

I did load m5v with a 100ohm resistor and it was okay

Here's an update, I think my M5v is okay. I think its the control PCB.
When i jump 5V from smps to pin 1 of ic211, on the control PCB, i get the dreaded relay clicks. the manual says the led should blink, i don't get the blinking i only get the relay clicks, Also if the ribbon cable is plugged in from the y-sus to the control pcb i get clicks. Could it be the control board.

[tom66]

Re: Lg plasma 42PQ60 relay clicking

I would suggest checking across M5V and GND on the control board for a short circuit.

[kcbadkul]

Re: Lg plasma 42PQ60 relay clicks and release

When power is plugged, relay clicks and releases and remains released. 5v sty remains present, RL_ON, 5V_on, Vs_on command present at respective pins of connector P813 of smps. Pfc voltage rises momentarily to 390V and drops. NO VA, VS, 12V and 17V. tried replacing 2A20112 pfc ic, but no change. Also replaced L6599D ic but no change. No shorting of any component at any point. all low value resistance and fuses ok. Any suggestion to attend the defect.