Logik LOG32lw782

[selldoor]

Re: Logik LOG32lw782

Pictures are great - should have done the backs as well.

When its back together I think its back to basics.
Like what is the voltage on the BIG cap and is it steady? Care High voltage
could be 400vdc

[joehezzer]

Re: Logik LOG32lw782

Pictures are great - should have done the backs as well.

When its back together I think its back to basics.
Like what is the voltage on the BIG cap and is it steady? Care High voltage
could be 400vdc

lol yeah its easy to forget sometimes that pics tell a thousand things

[joehezzer]

Re: Logik LOG32lw782

When its back together I think its back to basics.
Like what is the voltage on the BIG cap and is it steady? Care High voltage
could be 400vdc

the voltage jumped around a bit so i earthed to the chassis, saying that i will resolder that connection. I got 120v, the cap is rated at 450v. All the tracks look good on the back as i checked and re soldered pretty much all of the board as there was a couple of dodgy joints

[selldoor]

Re: Logik LOG32lw782

120!! is that a typo? should be min of 230*1.41 so around 325 vDC

[joehezzer]

Re: Logik LOG32lw782

120!! is that a typo? should be min of 230*1.41 so around 325 vDC

lol bouncing around 300 ish

[selldoor]

Re: Logik LOG32lw782

Well thats better but even so it is too low and should be steady. Battery in meter ok?
While I am on and in case I forget - on the back of the board there are two 000 rated resistors that they have used as fuses - middle under one of the spacers in your pic F801 and F802 - test them for continuity - set off (unplugged) meter on ohms should be same as holding probes together.

[joehezzer]

Re: Logik LOG32lw782

Well thats better but even so it is too low and should be steady. Battery in meter ok?
While I am on and in case I forget - on the back of the board there are two 000 rated resistors that they have used as fuses - middle under one of the spacers in your pic F801 and F802 - test them for continuity - set off (unplugged) meter on ohms should be same as holding probes together.

f802 0.00
f801 0.00 looks good

batteries seem ok on meter when testing other stuff

[selldoor]

Re: Logik LOG32lw782

Pity! when things are not right a bad fuse is good!
Can you test the voltage in to the bridge rectifier should be 230vac (middle pins)
and voltage out (outer pins) should be 325vDC change your meter setting.
It is high volts and may not be easy to get at -may have to solder wires on but
will need to be really careful.

[joehezzer]

Re: Logik LOG32lw782

Pity! when things are not right a bad fuse is good!
Can you test the voltage in to the bridge rectifier should be 230vac (middle pins)
and voltage out (outer pins) should be 325vDC change your meter setting.
It is high volts and may not be easy to get at -may have to solder wires on but
will need to be really careful.

you mean these, just thought id check first

[selldoor]

Re: Logik LOG32lw782

No I attach a pic showing what I think is the bridge from the underside on top it should be a dark grey thin rectangle has a slope at one end of the top.
Also on the pic I have marked in pink something I would like you to look at
it just looks odd!! In yellow I have marked some joints to look at - they may well be ok but again they look a bit odd on the picture.

[joehezzer]

Re: Logik LOG32lw782

ok cheers, just found rectifier for some strange reason i just did not see there lol

[joehezzer]

Re: Logik LOG32lw782

ok the bridge rectifier starting from bottom solder joint on your picture just under 200v the two middle ones not getting anything, the last one about 130 volts ish all the other joints look ok just flux i will double check though, so it so could be rectifier, when i put the gauge on the outer solder joints i did hear the screen click not very loud faint not heard that b4 i also have another of these psu boards wich i bought and that does not work either so may be good for parts if needs

[selldoor]

Re: Logik LOG32lw782

Sorry - should have explained the test better. You need the meter on vAC600 and test the two inner pins one probe on each pin - they should be same as mains 230VAC.
Then put the meter on vDC600 and put a probe on each of the outer pins - should be 325 vDC

[joehezzer]

Re: Logik LOG32lw782

Sorry - should have explained the test better. You need the meter on vAC600 and test the two inner pins one probe on each pin - they should be same as mains 230VAC.
Then put the meter on vDC600 and put a probe on each of the outer pins - should be 325 vDC

ok will have a look later's after T

[joehezzer]

Re: Logik LOG32lw782

ok first pin 003 VDC second 128 VAC third 140 VAC fourth 234 VDC think thats right

[selldoor]

Re: Logik LOG32lw782

We seem to have a communication problem - I will do a picture and attach here in 5 mins or so

[joehezzer]

Re: Logik LOG32lw782

ok cool inners reading about 250 outters about 345/50

[joehezzer]

Re: Logik LOG32lw782

We seem to have a communication problem - I will do a picture and attach here in 5 mins or so

lol was having a moment seem to be having a lot just lately.

[selldoor]

Re: Logik LOG32lw782

OK so it is usual to find the same DC voltage on the BIG CAP.

perhaps it need resoldered. Test it again and if not 345 either it needs replacing
or something between the bridge and it is wrong. I will have another look at the
back circuit later unless you come back with a revelation.
Watching mini animals on tv.

[joehezzer]

Re: Logik LOG32lw782

Gonna have alook weekend again I may de solder big cap out weekend as I can test it, ihave a cheapo cap tester. Am also watching hidden kingdoms cheers for your help so far