LG Flatron L204WS

[matthmal]

Re: LG Flatron L204WS

The green component behing the TH101 is not glass, it is a ceramic capacitor (VAR 101).

Results as follows:
TH101 -> 009
VAR101 > 1

[matthmal]

Re: LG Flatron L204WS

I thought that answer just related to the mains lead test as that is what you quoted

sorry for not specifying

[selldoor]

Re: LG Flatron L204WS

Another thought - does the mains cable plug straight into the power board or does it plug in with a "kettle" plug and a connecting wire from the kettle plug to the pins on the power supply

[matthmal]

Re: LG Flatron L204WS

the second one is correct. it plugs in with a "kettle" plug and a connecting wire from the kettle plug to the pins on the power supply

[selldoor]

Re: LG Flatron L204WS

Ok can you ohms test the cable from the "kettle" connector to the Board connector.
Does it look burnt at all?

[matthmal]

Re: LG Flatron L204WS

Same results achieved. No the wire doesn't even look burnt.

[selldoor]

Re: LG Flatron L204WS

Oh well - worth a try.
On the VAR 101 ( Varistor) test was the 1 1.0 ohms or was it 1 on the left hand side of the meter meaning out of range?

[matthmal]

Re: LG Flatron L204WS

1 on the left hand side of the meter

[selldoor]

Re: LG Flatron L204WS

Well Im stumped for now - when it blew the house electrics was it all in the case.

If it was out of the case confirm it was not on a conductive surface.

I think wait till tomorrow get just the Power board - make sure its not touching anything
and power it up. I cant think of any more tests - just check these again
The fuse is not blown
The Varistor is not blown
The Thermistor - im not sure about that resistance rises with heat but I dont know what it should start at.
Kettle lead is ok
Kettle socket to Power Board lead is ok
Check again for resistance across the mains in pins on the power board - is it the same as pins apart = ok or pins together =bad

[matthmal]

Re: LG Flatron L204WS

i will try to power the board tomorrow morning... it is the same when one will test life with neutral.

If you connect life with life or neutral with neutral there will be a beap

[matthmal]

Re: LG Flatron L204WS

Ok so I have now tried the board on the desk and it didn't blow out the electricity for me. I have tried to connect a board every time and test it and it never blew the electricity even when connected all the components.

Now the problem is that it doesnt even turn on. I press the power button and no sign of life. I will try to do a small test and will get back to you.

[matthmal]

Re: LG Flatron L204WS

ok so I ran 2 tests and the results are as follows:
- I tested the big caps, POWER ON and VDC600. They both results 332V.
- I then tested the transformer, POWER OF, 2000ohms, the I touch pin 1->pin2, pin1->pin3, pin1->pin4, pin2->pin3, pin2->pin4, pin3->pin4 and all results where 000 and the meter beaped.

Hope that this helps a bit.

[selldoor]

Re: LG Flatron L204WS

ok i suspect the board was somehow touching the frame when it was blowing the mains. I have to go out for an hour next test the socket between
power and main board - all connected and switched on- meter on volts dc 200
black lead on earth screw check each pin with red probe and post results.

I am not sure about the readings you got on the transformer across the two pins on each end should be between 600 and 1200 ohms? unless it is an odd one - I will look at it when I get back -1 hour

[selldoor]

Re: LG Flatron L204WS

Ok the transformer is an odd one ( another odd one) I have marked on picture - NO Power to board meter on Ohms 2000 check S1 to s2 and S3 to S4.

[matthmal]

Re: LG Flatron L204WS

i'm back. let me test them and will post again. give me 5 minutes

[matthmal]

Re: LG Flatron L204WS

Test 1:

S1 to S2 -> 903
S3 to S4 -> 920

Test 2:
Pin 1-> ranging from -0.01 to -2.7
Pin 2-> ranging from -0.01 to -2.7
Pin 3-> ranging from -0.01 to -2.7
Pin 4-> ranging from -0.00 to -0.01
Pin 5-> ranging from -0.01 to -1.4
Pin 6-> ranging from -0.01 to -1.6
Pin 7-> ranging from -0.01 to -1.6
Pin 8-> ranging from -0.01 to -1.7
Pin 9-> ranging from -0.01 to -2.1
Pin 10-> ranging from -0.01 to -0.03
Pin 1-> ranging from -0.01 to -2.1

[matthmal]

Re: LG Flatron L204WS

i have noticed that it looks burnt

[selldoor]

Re: LG Flatron L204WS

Right- the transformer might be ok "just"

Was the main board connected for the connector test?

[matthmal]

Re: LG Flatron L204WS

main board connected to power board with POWER ON and i tested the pins of the main board

[selldoor]

Re: LG Flatron L204WS

Ok does it smell burnt?
Can you do a really clear straight on picture of the top of the main board.