*Please help* GRUNDIG GULCD37HDIT wont turn on

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

I'll have to have a look tomorrow...I've got to get to work in half hour....thank you very much for your help so far...

Learning something new everyday

[multimeter]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

hang on a mo before you do that.......,whats the marking on the other +stby ?cant quite read it

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

hang on a mo before you do that.......,whats the marking on the other +stby ?cant quite read it

+stby is 5.6v, the other 2 are reading 0.33v

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

thats ok dude,the pins to join are +5vstb and the one marked stby,but no mainboard connected,just want to confirm psu is actually working ,sorry its an ocd thing

Am I right in thinking you want me to join +5vstb and the one marked stby pins together somehow...and then take a reading?

[multimeter]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

Am I right in thinking you want me to join +5vstb and the one marked stby pins together somehow...and then take a reading?

yes,linking the two should make the power supply rails to come up,then you can check the voltages on the other pins

then we can bring the inverter live by using the same technique but different pins

to confirm the psu is working how it should

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

I've connected the 2 pins together as you instructed but Im not getting any voltages on any of the pins...?? Not sure if I've done it right...

[tom66]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

What voltage do you measure on 5VSTB and STB while doing this? Note: normally I would use resistor to prevent damage to PSU board, of around 100 to 470 ohms.

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

I've connected the 2 pins together as you instructed but Im not getting any voltages on any of the pins...?? Not sure if I've done it right...

My BAD.....I forgot to connect the inverter board cables!!

I get the following voltages now..

from +5vstby and 2 pins below this I get 5.7v, stby is also reading 5.7v

[tom66]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

Get any 24V on inverter cables?

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

No 24v on any of the inverter cables

[multimeter]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

No 24v on any of the inverter cables

good,with the +5vstby pin and stby connected,keep connected..


we can try and turn the inverter on.. bl_on pin to +5vstby

with inverter cables connected do you see the back-lights come on?

also with the +5vstby and stby connected,does the 12v rail come up?

but before you do this post up what the writing is next to the connector at the inverter end on each pin.

as in post #18,use a resistor,for the jumpering to limit current

[selldoor]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

hang on a mo before you do that.......,whats the marking on the other +stby ?cant quite read it

Neither can I what does it say? 5V ??? in

[tom66]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

no 24V the inverter will not turn on - Power board is bad.

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

good,with the +5vstby pin and stby connected,keep connected..


we can try and turn the inverter on.. bl_on pin to +5vstby

with inverter cables connected do you see the back-lights come on?

also with the +5vstby and stby connected,does the 12v rail come up?

but before you do this post up what the writing is next to the connector at the inverter end on each pin.

as in post #18,use a resistor,for the jumpering to limit current

OK...I've used a resistor to limit the current....there is no 12v while the +5vstby and stby are connected

The back lights do not come on.

As for the writing I've attached a picture wasn't sure what you meant. They are labelled x532 and x521

Second picture is the actual inverter board.

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

Neither can I what does it say? 5V ??? in

I think it says +5Vmo in??? cant be sure...its so small

[multimeter]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

no 24V the inverter will not turn on - Power board is bad.

would the 24v be present at the inverter end,after bl_on signal and stby connected?, ,maybee its generated after the bl_on signal is present

can find a sch for it

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

Is this the schematic for it?

[multimeter]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

Is this the schematic for it?

think thats for the mainboard

[simple-me]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

time for work guys...thank you very much so much so far...its been interesting

[tom66]

Re: *Please help* GRUNDIG GULCD37HDIT wont turn on

24V is usually present before BL ON changes.