LG Flatron L204WS

[matthmal]

Re: LG Flatron L204WS

No it does not smell burnt. let me take the picture...

[matthmal]

Re: LG Flatron L204WS

this is the best that i can take...

[selldoor]

Re: LG Flatron L204WS

HaHa we generally refer to that as the bottom of the board

[matthmal]

Re: LG Flatron L204WS

sorry my mistake.

[selldoor]

Re: LG Flatron L204WS

Hmm - no fuses or anything obvious with it all connected and switched on
can you test what I think may be two voltage regulators.- bottom left of the pic. ( Pictures are improving )

Read this, by retiredcaps, on how to test. The bigger one if you post the part number I will check it is a regulator - or you can.

https://www.badcaps.net/forum/showthread.php?p=261329

EDIT looks like 1117F 18 xxx which means it is a 1.8v regulator

[matthmal]

Re: LG Flatron L204WS

will do and get back to you

[matthmal]

Re: LG Flatron L204WS

Voltage Regulator Test 1:

Model:
KIA
1117F
18738

Results:
Pin 1 -> ranging -1.8 to +1.92
Pin 2 -> ranging -1.8 to +1.89
Pin 3-> ranging -1.8 to +1.91

Voltage Regulator Test 2:

Model:
EH16A
714J92

Results:
Pin 1 -> ranging -1.8 to +1.89
Pin 2 -> ranging -1.68 to +1.81
Pin 3-> ranging -1.86 to +1.83

[selldoor]

Re: LG Flatron L204WS

Well at least we have some voltages!! they should however be STEADY at 1.8.
hence the term regulator

Wonder if your meter batteries are ok - been getting a lot of work?



As there are only 3 caps on the board - Sam Young? - not great! perhaps change them.

[matthmal]

Re: LG Flatron L204WS

Hmmmm it has a 9v battery and i dont use it very often. Ill replace the caps and report again. So does it mean that the regulators are bad?

[selldoor]

Re: LG Flatron L204WS

Not certain - they generally fail by producing a steady but incorrect voltage
or no voltage at all. I know that having a failing cap connected to a VR can
produce bad results - I would hope that they are ok and see what replacement caps do. What we need to find is more voltages. A couple of things to try would be test the connector pins on the power supply without the main board connected. Also and you will need to be careful check the voltage on the start up cap - at one point I though it was a bit rounded but then decided it was just the picture. It is a 50v one between the heatsink and the yellow transformer. So you will need power on and meter on v200dc -obviously it should not be more than 50vdc you can measure topside if you can get at it or underneath. Set it all up so you can measure then switch it on careful not to touch the BIG caps.

[matthmal]

Re: LG Flatron L204WS

The cap that is between the heatsink and the yellow transformer is supposed to be 50v 33uF and when tested it is ranging between 9.5 to 14.3V. Well I guess it's a bad cap. Can the cap be replaced with a different one as I don't have one that type of uF.

I will do the other tests soon...

[matthmal]

Re: LG Flatron L204WS

can a 16v 100uF cap be replaced with a 25v 220uF cap?

Can you please tell me how to know if a bigger uF is good or not?

[budm]

Re: LG Flatron L204WS

It depends on how it is used, if it is used for timing circuits, then No. If it is used for simple filter cap, then you can use it for now just for testing the function of the circuit.
Higher voltage is OK to use as long as the body still fit the board since higher voltage cap will be bigger than the lower voltage cap with the same capacitance rating.

[matthmal]

Re: LG Flatron L204WS

The cap that is between the heatsink and the yellow transformer is supposed to be 50v 33uF and when tested it is ranging between 9.5 to 14.3V. Well I guess it's a bad cap. Can the cap be replaced with a different one as I don't have one that type of uF.

I will do the other tests soon...

So can this cap be replaced with something else?

[selldoor]

Re: LG Flatron L204WS

I believe you could use a 50v 47uf 50v68uf
25v 33uf 25v47uf 25v68uf

Perhaps even higher u rating for testing but not lower than 25v and not lower than 33uf

[matthmal]

Re: LG Flatron L204WS

i do have 50v 47uf cause u do have that. will try it and keep you posted

[matthmal]

Re: LG Flatron L204WS

i've replaced the cap and it gave me the same results as the old one + i got a shock hehe. well having the same results was not worth the shock

[selldoor]

Re: LG Flatron L204WS

Good to get a few jolts early in your introduction to electronics- makes you more careful
if not dead Perhaps use an RCD device.?

Pity it didnt help - back to the drawing board - when you say same result do you mean the
varying voltage on the cap? At least its another voltage.

Can you check the voltage across the two big resistors on the main board.

Perhaps also test the resistance - Power OFF meter on ohms ???
Type in Hobby Resistance into your browser and you will find a site that
gives you the resistance colour band guide.See on there what resistance to expect and set your meter range accordingly.

[matthmal]

Re: LG Flatron L204WS

yeah we do have an rcd device in our house but it was only a small shock hehe. i meant same voltage results for the cap as it was before.

may i ask which resistors? yeah i know im a little bit of a headache but i'm new to electronics hehe

[selldoor]

Re: LG Flatron L204WS

The Big Blue Bodied ones