LG 32lc46 totaly dead

[tom66]

Re: LG 32lc46 totaly dead

could someone help me find the controller ic part number can this item be tested using a dmm?
will post pics up but leant camera out as in first post wont get back untill monday.

Unfortunately there are hundreds if not thousands of controller ICs, we can't just guess.

[vinceroger69]

Re: LG 32lc46 totaly dead

hi just managed to borrow a neighbours camera took 4 pics before recharable battery went flat (sods law) anyway these are the best i could get so if at all possible could you point out which the controller ic is you think thats faulty giving me no voltages etc. then i will try to get part number of the ic for you to help me locate one if possible. cheers guys
edit!! just spoke to my local scrap metal man who comes around he says he has a few lcd tvs hes been keeping with smashed screens etc so going around to see him to see if theres a lg lcd there or anything with the same power board numbers etc will update soon.

[Jasgriff]

Re: LG 32lc46 totaly dead

Hi Vince,

Its difficult to see anything with those pic's unfortunately.

Hopefully you have borrowed the charger so that you can have another go. We need both sides of the full board. It looks like you didnt have your camera set to macro which you need to do for the close up shots. Macro is the little flower symbol on your camera.

[vinceroger69]

Re: LG 32lc46 totaly dead

will do doubt if that camera will have that setting lol it was a praktica digipix 524 i think just a cheap job. but willl look just in case.

[vinceroger69]

Re: LG 32lc46 totaly dead

pics of the underside as requested and a couple of the top view before i recapped it

[tom66]

Re: LG 32lc46 totaly dead

What Panasonic caps did you use?

Also, what is the part # on U200 and U201... the two devices near each other, on the primary side.

[vinceroger69]

Re: LG 32lc46 totaly dead

in pic 8 you mean u100 and u101 well u 101 cant read at all (part number is on it just worn to bad to read even under magnifier) u100 looks like 0001-h26
all caps were panasonic 105c rated. cant seem to find a power supply circuit diagram/parts list? it says on the board . REV 1.2
07.5.7
EAX31845201/13

[Jasgriff]

Re: LG 32lc46 totaly dead

Try shining some light on it from an angle and you should be able to read it.

[vinceroger69]

Re: LG 32lc46 totaly dead

Try shining some light on it from an angle and you should be able to read it.

hopefully this is right
u100
001
H26

u101
MIC
44287YM
06492
these are the 2 on the primary side would these if faulty stop the rail voltages i have missing just retested board still only have the 2x 5volts present

[tom66]

Re: LG 32lc46 totaly dead

in pic 8 you mean u100 and u101 well u 101 cant read at all (part number is on it just worn to bad to read even under magnifier) u100 looks like 0001-h26
all caps were panasonic 105c rated. cant seem to find a power supply circuit diagram/parts list? it says on the board . REV 1.2
07.5.7
EAX31845201/13

What series of capacitors? Should say on the side. For example "FC" next to the temperature rating.

I get no hit for the MIC44287; it's quite possible it's a custom LG IC (this has been seen before on Samsung TVs.)

[vinceroger69]

Re: LG 32lc46 totaly dead

looks like fc to me
so any idea about the chip do you think its the problem? anyidea where to locate one from.
also before the M IN MIC there could be another leter or number just cant read it yet will try again now.
EDIT!! just re check looks like a funny then so its mMIC
4428YM
06492
http://search.digikey.com/uk/en/prod...6-5-ND/1029922
is this it do you think

[vinceroger69]

Re: LG 32lc46 totaly dead

does this look the right one to you guys cant seem to find any cheaper due to companys high postage costs when only needing 1
http://www.ebay.co.uk/itm/MICREL-SEM...25064840687652

[Jasgriff]

Re: LG 32lc46 totaly dead

Don't go ordering that yet we just needed to know what model it was to see how it operates.

[vinceroger69]

Re: LG 32lc46 totaly dead

ok thanks

[vinceroger69]

Re: LG 32lc46 totaly dead

sorry tom66 just read your post right
U200 is a
U3037M
705523
next to it is Q205 is a
62T03GH
725504
U600 is a
5501A
1D07725
u101 is a
MIC
4428YM
06492

[tom66]

Re: LG 32lc46 totaly dead

Any readable number on U100?

U101 drives the MOSFET device; U100 probably controls this driver IC.

However, even if you can't read the number... there's a capacitor C123 which is probably the start up capacitor. If this is bad then the controller will not start up.

Do you think you can test the voltage across this capacitor?

[vinceroger69]

Re: LG 32lc46 totaly dead

yes got a better magnifer u100 is a 0001 h26
c123 0 volts across it
c123 is a 50v 1uf

[tom66]

Re: LG 32lc46 totaly dead

yes got a better magnifer u100 is a 0001 h26
c123 0 volts across it
c123 is a 50v 1uf

There should be something like "LM326" (as an example) - some characters then some digits.

C123 is your problem - assuming that was taken with power applied?

[vinceroger69]

Re: LG 32lc46 totaly dead

power applied board turned over black lead cap- red lead cap+ power turned on 0 volts dmm set to dc volts
EDIT!!!! just changed that cap again still no voltage across it?

[tom66]

Re: LG 32lc46 totaly dead

power applied board turned over black lead cap- red lead cap+ power turned on 0 volts dmm set to dc volts
EDIT!!!! just changed that cap again still no voltage across it?

This is good, as it helps us locate the problem.

Check the DC resistance between the cap positive and negative, with the TV off.