Panasonic TX-37LX85P blink 3 times

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

Voltage is also 0V

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

OK, this indicates a lack of SUB5V. Can you locate that pin on PSU and test.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

I have only at 3 point 5V, all other is 0V.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

Ok, i check power supply board, and i nthink there is a problem in HOT part of the board, i dont have any power outputting the transformators T803 and T804

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

OK, there should be a voltage, 17V, always present, but you do not see this?

How are the voltages at pin 6 and pin 15?

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

0V both

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

Ok, what voltage do you see at RELAY_5V6 (pin #5)?

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

on #5 pin i have 5.75V

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

OK, that is good. Back to the main board. It isn't turning on the relay signal for some reason. Can you check page 49, in particular these test points:
- voltage across C5653 (near IC5602)
- voltage across C5655 (same area)

We noticed before SUB5V is missing, this is probably causing the 3 blinks now I think about it.

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

IC5602 is near the connector going to the LCD panel if it helps.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

i test #6 and #15 again with connected clamps when turning on TV, and the result is that #6 have 4.75V for a few sec, and then you hear click and back to 0V. #15 i always 0V

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

Ah, good, some progress, but when #6 is high (after first click, before second), what is pin #20 or #21 doing? Should be 17V.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

Nope, #20 and #21 os 0V when turning ON.

I find IC5602, and i find that one leg of capacitor is broken, (you can see in the picture), and i have no clue how will i solder it back. if you can see that the part of the board is still on the capacitor.

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

Which end (positive or negative) was that lead connected to?

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

negative (the one with red mark)

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

In which case you can find a ground on the board somewhere and just solder the lead to there.
Closer the better.

I'm pretty sure the green copper area right next to it is ground, you can scrape the soldermask (green layer) off carefully with a screwdriver, then solder to that.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

Ok, i solder it to some ground nearby.

Now TV blink 4 times red, no more 3.

i wrote in picture the voltages

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

Check your wiring, you just shorted that capacitor "470" positive to GND.

[rtstorm]

Re: Panasonic TX-37LX85P blink 3 times

Ok, we are now back to 3 blink LED. I solder on wrong place. Check voltages, they are still the same as in the picture above.

[tom66]

Re: Panasonic TX-37LX85P blink 3 times

Can you check the voltage at pin #4 of the Q5610 device.