Re: LG TV - Help finding power board schematic
ZD503? maybe D503?...
yrn11
Member
Last Activity: 11-01-2016, 12:02 AM
Joined: 07-21-2015
Location: TLV
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Re: LG TV - Help finding power board schematic
TV Model - LG 32LD550-TALeave a comment:
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LG TV - Help finding power board schematic
Hi all,
my LG TV won't turn on and I'm struggling to find service manual for it's power board, can you please assist.
PCB - EAX61124201-15 REV 1.2 -
Re: LG 32LD550 won't turn on - HELP!
Well I finally got all the stuff and replaced it, but got nothing.
same V readings are there on Q405 (0.67, 0.04) as for resistance it's now 0.
as for resistance I got
R419 - 0.9
QR05 (C-E) - 0.9
Any idea?...Last edited by yrn11; 09-27-2015, 07:26 AM.Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
well in order to validate it, I've ordered a soldering tip that is small enough...so it will have to wait a bit....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
will this do the job?
[url]http://www.aliexpress.com/item/2SC3052-LF-SOT-23/32375273839.html[/url]Re: LG 32LD550 won't turn on - HELP!...839.html[/url]...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Yes I have, can you please point me to the name of the transistor?
I've looked it up on aliexpress and couldn't find anything similar....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Hi,
I've managed to get some time to verify it again, i'm getting almost 1K between C & E once PSU board is disconnected.
what do you suggest?...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Well I've checked it up, it's close to 0 Ohms.
as for Q405 & R419 as I've written above -
R419 resistance - is very close to 1k Ohms, it's about 0.9k Ohms.
Q405 C - E resistance - is also very close to 1k Ohms, 0.95k Ohms.
Sounds very similar but I've checked them all...nothing.....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
I kind of lost you on the way, I've checked Q405 & R419 resistance as Agent24 said -
R419 resistance - is very close to 1k Ohms, it's about 0.9k Ohms.
Q405 C - E resistance - is also very close to 1k Ohms, 0.95k Ohms.
But I didn't quite followed you, between which elements should I check the resistance? Error pin and?
Are you talking about IC1002?, because I couldn't find in the service manual any IC BD9270 (where should I look for it?)....Last edited by yrn11; 07-25-2015, 01:54 PM.Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
R419 resistance - is very close to 1k Ohms, it's about 0.9k Ohms.
Q405 C - E resistance - is also very close to 1k Ohms, 0.95k Ohms.
Well I've checked R1064, both sides shows the same numbers.
TV OFF = 0v at both sides.
TV ON = 3.4 at both sides....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Hi,
Here are the readings -
OFF: B = 0.02, C = 0
ON: B = 0.67, C = 0.04....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
[U]R421:[/U]
1st time connecting to AC:
Left = 3.4, Right = 0.64
ON -
Left = 3.41, Right = 0.68
StandBy -
Left = 0.02, Right = 0.02
- Why is there a voltage after connecting it for the first time to AC?Re: LG 32LD550 won't turn on - HELP!
[U]R421:[/U]
1st time connecting to AC:
Left = 3.4, Right = 0.64
ON -
Left = 3.41, Right = 0.68
StandBy -
Left = 0.02,...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Well I took some readings again for all components while now each one of the probes was on each side of the component (is this the right way to check?).
R1064 - Standby - 0,0
R1064 - ON - 3.4, 3.4 --> seems like this is getting out the voltage right.
Q405 - Standby & ON (I'm not sure which is the emitter and which is the collector) - 0.67
R415 - 0
R418 - 0.03
R419 - 3.3
R421 - 2.7
R425 - 0.9
R426 - 0
R427 - 3.4
Attached pics of the...Last edited by yrn11; 07-23-2015, 12:28 PM.Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Well I'm a bit lacking on how to read a schematic map, but I took the readings, Negative probe was on chassis - (see pic1 for schematic)
Q405 - 0.04, 0.67, 0
R415 - 0.04, 0.04
R418 - 0.04, 0
R419 - 3.3, 0.04
R421 - 3.4, 0.67
R425 - 0.04, 0.94
R426 - 3.4, 3.4
R427 - 3.4, 0
I looked up "INV_CTL" and only found that is connected to R1064 (see pic2) - didn't took readings there yet....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
See attached.
what should I look for?...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Product code is - 32LD550-TA.AMFWLH, can you share the service manual?...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Ok, so what should I check on the main board.
The 308 was a wrong reading....Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
AC is 220, I've re tested the main caps.
Standby - 325
On - 389...Leave a comment:
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Re: LG 32LD550 won't turn on - HELP!
Yes, it was around 308....Leave a comment:
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