Re: LG 55LS4500 No Standby light will not power on
New used control board installed. up and running.
RFITTS46
Member
Last Activity: 07-19-2019, 09:42 PM
Joined: 12-15-2014
Location: Merrimack, NH
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Re: LG 55LS4500 No Standby light will not power on
Current status purchased a used control board off of Ebay. Will status outcome soon as it gets installed.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
okay I don't usually purchase something unless I know what I am buying.
The control board has an orange sticker bottom left, next to mounting screw. It states:
55L84500-UD.AUSWLJR
VER.3.20.12
PM.VER.3.1.2 Y.C hand written 2
How does one go about making sure the control board is a duplicate or a compatible board?
Other places selling a control board for a LG 55LS4500-UD on the internet state:
Part Number: EBT62227807
Identifying Numbers That Appear...Last edited by RFITTS46; 07-10-2019, 07:55 AM.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
how does one go about sourcing a known good replacement?
shopjimmy does not have one
eBay?
anything else I might want to be aware of?Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
budm....set up jumper resistors and the LED backlights come on.
any additional tests?Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
last set of posted P201measurements were taken without jumping 3.5V to Pwr On pin because budm said something about properly jumping the psu board. awaiting proper jumping instructions so no damage is incurred to control board.
earlier threads show proper power supply measurements evident when jumping 3.5V to P201 Pwr On pin.
budm wanted the second row of P201 pins measured.
I thought it maybe best to post non jumpered measurements first.
If it is requested to jumper and provide...Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
last set of posted P201measurements were taken without jumping 3.5V to Pwr On pin because budm said something about properly jumping the psu board. awaiting proper jumping instructions so no damage is incurred to control board.
earlier threads show proper power supply measurements evident when jumping 3.5V to P201 Pwr On pin.
budm wanted the second row of P201 pins measured.
I thought it maybe best to post non jumpered measurements first.
If it is requested to jumper and provide...Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
P201 on power supply board, Mains Connected, no standby light on
P-Dim2 .04
12V .04
12V .04
12V .04
GND 0
GND 0
3.5V 3.5
3.5V 3.5
GND 0
GND 0
24V 0
PER ON 0
ERROR 0
P-Dim .139
N.C .015
DRV-ON .124
VSYNCH-IN 0
GND 0
3.5V 3.5
3.5V 3.5
GND 0
GND 0
24V 0
24V .017
PUSHING PWR ON SWITCH NO DIFFERENCELeave a comment:
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Re: LG 55LS4500 No Standby light will not power on
budm..
P201 on powers supply board, Mains Connected, no standby light on
jumper 3.5V to Pwr On
P-Dim2- 3.5
12V- 12.2
12V- 12.2
12V- 12.2
GND- 0
GND- 0
3.5V- 3.5
3.5V- 3.5
GND- 0
GND- 0
24V - 24.8
PWR ON 3.5
where the LED voltage is only 56V could it be booster circuit?Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
when jumpering 3.5V to Pwr On the LED strip voltage is 56V. Seems low should be 78V.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
sometimes when mains are connected the 12V, 24V, and across big filter caps 380V is present. The yellow led blinks 5 times repetitively.
when this occurs there is no standby light.
it isn't doing it right now.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
P201 on powers supply board, Mains Connected, no standby light on
P-Dim2 .04
12V .04
12V .04
12V .04
GND 0
GND 0
3.5V 3.5
3.5V 3.5
GND 0
GND 0
PWR ON 0
pressing power on .....no change
I jumpered 3.5V to PWR ON before I realized it was supposed to be 24V
jumpering 3.5V all voltages present. 380V on large filter caps...Last edited by RFITTS46; 07-05-2019, 06:29 AM.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
okay looks like the Fluke max's out at 200khz. I have an analog 20mhz oscilloscope?Last edited by RFITTS46; 07-04-2019, 06:33 PM.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
3.5V present P403 pin 9
3.5V present Micom Voltage
measure X201 clock
will Fluke 83 be able to measure 24mhz?
If so this is a two leaded component assume one probe on each should read 24mhz?Last edited by RFITTS46; 07-04-2019, 08:58 AM.Leave a comment:
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Re: LG 55LS4500 No Standby light will not power on
when mains connected and no Pwr On present from control board....jumpered 3.5V Std By and the psu board seems to have all voltages present. the big filter caps have 380V across them. I measured 56V leaving the top of the psu board P201 and P203. this must be supplying the LED strips? the board has marked on 78V?
just looked at what was marked on the board for Pwr On (P201) and it has 24V. Is this the signal sent back from the control board and it should be 24V and not 3.5V?Leave a comment:
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LG 55LS4500 No Standby light will not power on
Original owner, several years ago lost audio but used analog outputs.
No other problems and currently has no standby light and will not power on.
The Pwr On (3.5V signal back from main brd) is erratic, sometimes there sometimes not. sometimes when connected to mains it is there and 12V and 24V present and across the big caps 380V present. There is a green LED on psu board and it sometimes blinks 5 times repetively.
Sometimes when connected to mains no 3.5V Pwr On from main board. The 2X 3.5V present from psu board but no 12V or 24V and it reads 179V across the big... -
Re: rfitts46
hello, mechanical engineer with fetish for antique/vintage audio equipment. will on occasion play with a tv. been troubleshooting audio for 10 years or so. most of my education is learned on forums like this since I am not in the trade.Leave a comment:
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