Sharp LC-32GA6E Stuck in standby

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Can also hear high pitch sound very low, with a ticking sound every 3-5 seconds coming from one of the transformers Think its T701.

When i unplug the power cable the whinging sound slighty goes higher, then fades out.

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Need a little help does these readings sound correct?
Meter set to diode

Q701 reads:-

Black probe on G, Red probe on D = OL
Black probe on G, Red probe on S = 1.267
Black probe on D, Red probe on S = .476

RED probe on G, BLACK probe on D = OL
RED probe on G, BLACK probe on S = 1.164
RED probe on D, BLACK probe on S = OL

Q702 reads:-

Black probe on G, Red probe on D = OL
Black probe on G, Red probe on S = 1.272
Black probe on D, Red probe on S = .475

RED probe on G, BLACK probe on D = OL
RED probe on G, BLACK probe on S = 1.153
RED probe on D, BLACK probe on S = OL

Are they ok?
Part No=12N60C

[ben7]

Re: Sharp LC-32GA6E Stuck in standby

Need a little help does these readings sound correct?
Meter set to diode

Q701 reads:-

Black probe on G, Red probe on D = OL
Black probe on G, Red probe on S = 1.267
Black probe on D, Red probe on S = .476

RED probe on G, BLACK probe on D = OL
RED probe on G, BLACK probe on S = 1.164
RED probe on D, BLACK probe on S = OL

Q702 reads:-

Black probe on G, Red probe on D = OL
Black probe on G, Red probe on S = 1.272
Black probe on D, Red probe on S = .475

RED probe on G, BLACK probe on D = OL
RED probe on G, BLACK probe on S = 1.153
RED probe on D, BLACK probe on S = OL

Are they ok?
Part No=12N60C

Those readings look good.

I suspect a bad cap in here, especially with the random on/off issues it is having.

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

cheers ben7, yea the green led on the front is staying on? wasnt doing that before.

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Still no joy, the whining sound is coming from this relay, i recapped nearly the whole board yesday apart from the large caps.

Can anyone piont me what directions i should take next.

[ben7]

Re: Sharp LC-32GA6E Stuck in standby

Still no joy, the whining sound is coming from this relay, i recapped nearly the whole board yesday apart from the large caps.

Can anyone piont me what directions i should take next.

Hmm, either the power supply standby has a lot of ripple, or the circuit meant to turn the relay on is not functioning right.

Check the standby voltage again.

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Just connected the DMM onto CN706 something aint right?

pin1= 1.26v
pin2= 0.00v
pin3= 1.26v
pin4= 0.00v
pin5= 0.00v
pin6= 0.00v
pin7= 0.01v
pin8= 0.15v
pin9= 1.78v
pin10= 0.00v
pin11= 3.48v
pin12= 3.48v
pin13= 0.00v

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

hiya thought i come back & retry.
Tv led showing solid green, slight high pitch sound coming from i think L703,
pin1= 1.26v
pin2= 0.00v
pin3= 1.26v
pin4= 0.00v
pin5= 0.00v
pin6= 0.00v
pin7= 0.00v
pin8= 0.14v
pin9= 1.78v
pin10= 0.00v
pin11= 3.48v
pin12= 3.48v
pin13= 0.00v

How to i go about checking D701, for some funny reason can only get readings with the probes connected reverse?

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Sorry just a quick heads up, are theses readings correct

DMM set to 2k diode:>

Q710:
Red probe on G - Black probe on S = .322
Black probe on G - Red probe on S = .322

Red probe on G - Black probe on D = .913
Black probe on G - Red probe on D = 1.

Red probe on D - Black probe on S = 1.
Black probe on D - Red probe on S = .524

DMM set to 2k diode:>

Q711:
Red probe on G - Black probe on S = 1.
Black probe on G - Red probe on S = 1.094

Red probe on G - Black probe on D = 1.
Black probe on G - Red probe on D = 1.

Red probe on D - Black probe on S = 1.
Black probe on D - Red probe on S = .523

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

the number written on the front :> 57299 K3520.01

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Anyone?

[tom66]

Re: Sharp LC-32GA6E Stuck in standby

I don't see anything obviously wrong with your readings.
Does the board still whine?

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

yea is does still whine, ive tried to google the part but it just dont make sense?

[tom66]

Re: Sharp LC-32GA6E Stuck in standby

It's probably from that yellow transformer above. Checked shorted diodes on output?

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

check which diode?

[tom66]

Re: Sharp LC-32GA6E Stuck in standby

All of them.

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

Ive checked diodes a few times before, if im correct anything between .3XX & .8XX is fine?how do i go about testing that transformer.

[tom66]

Re: Sharp LC-32GA6E Stuck in standby

The transformer is probably OK, as they have a failure rate nearing zero percent. Do you have any standby voltage at all?

[Jahson]

Re: Sharp LC-32GA6E Stuck in standby

post #28

[tom66]

Re: Sharp LC-32GA6E Stuck in standby

How's the voltage with the main board disconnected?