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Old 12-11-2021, 05:26 AM   #1
jimbofz
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Default lg 47LB585V help to identify ic please

Hi this lg has a rediculously small 16 pin ic on mainboard cooking
causing brief flash of sby led then dead its the one next to a coil 2r2
reference ic2403 i cant make it out looks like:

5419
0rAA
A36X
this tv had bad b/l leds and i replaced all the strips with new
they tested fine with led tester ,ifound the b/l controller ic s/c bl0202b and q803 s/c these were replaced but leds just flashed on for one second .
to save time (big mistake) i ordered replacement psu from e bay
when fitted it caused the mainboard problem grrr!
now even my original psu wont start up
ive tried to find cct for main board i can only find psu cct
if someone can help me identify the ic or suggest why the rogue psu has caused the problem it would be a great help

the rogue psu is:EAX65423801(2.1)REV 2.0
the original psu is:EAX65423801(2.2)REV 2.1
Attached Images
File Type: jpg IMG_20211211_103217.jpg (706.1 KB, 21 views)
File Type: jpg IMG_20211211_103235.jpg (846.2 KB, 15 views)
File Type: jpg IMG_20211211_103534.jpg (910.1 KB, 12 views)
File Type: jpg IMG_20211211_103911.jpg (592.8 KB, 5 views)
File Type: jpg IMG_20211211_103957.jpg (596.2 KB, 6 views)
File Type: jpg IMG_20211211_104031.jpg (967.3 KB, 10 views)
File Type: jpg IMG_20211211_104105.jpg (661.9 KB, 9 views)
File Type: jpg IMG_20211211_104135.jpg (723.6 KB, 7 views)
File Type: jpg IMG_20211211_104219.jpg (690.3 KB, 8 views)
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Old 12-11-2021, 07:04 AM   #2
lotas
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Default Re: lg 47LB585V help to identify ic please

ic2403 - TPS54319
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File Type: jpg TPS54319.jpg (33.9 KB, 12 views)
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File Type: pdf TPS54319.pdf (1.27 MB, 20 views)
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Old 12-11-2021, 09:05 AM   #3
jimbofz
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by lotas View Post
ic2403 - TPS54319
many thanks ,now i have somewhere to start ,
i suspect ,as it gets hot.
something external to it is drawing current through it
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Old 12-11-2021, 09:22 AM   #4
lotas
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Default Re: lg 47LB585V help to identify ic please

service manual
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File Type: png DDR MAIN 1.5V.PNG (68.4 KB, 28 views)
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File Type: rar lg_47lb580v.rar (6.30 MB, 13 views)
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Old 12-11-2021, 11:20 AM   #5
jimbofz
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by lotas View Post
service manual
thanks ,i have s/c on pins 1 and 2 to ground.
im going to try to replace ,removal no problem with s station but fitting new will be a chalenge,
im going to force on the psu without connecting main board and see if 3.3v supply is high ,do you think this could be the reason the ic failed?
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Old 12-11-2021, 11:42 AM   #6
lotas
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Default Re: lg 47LB585V help to identify ic please

If it exceeded more than 7v, then the IC could burn out.
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File Type: png standdy.PNG (126.0 KB, 18 views)
File Type: png TPS54319 V in.PNG (30.5 KB, 6 views)
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Old 12-11-2021, 12:24 PM   #7
jimbofz
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Unhappy Re: lg 47LB585V help to identify ic please

not looking good .pin 10,11,and12 .the 1.5v o/p s/c
so protection zener zd2401 was never fitted
so any number of components could be s/c
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Old 12-11-2021, 12:56 PM   #8
lotas
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Default Re: lg 47LB585V help to identify ic please

1.5v for power supply of random access memory (DDR).
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Old 12-12-2021, 07:26 AM   #9
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Default Re: lg 47LB585V help to identify ic please

If you lift L2411 are pins 10, 11 & 12 still short and if not is the other end of L2411 showing the short.
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Old 12-12-2021, 09:06 AM   #10
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by dick_barton View Post
If you lift L2411 are pins 10, 11 & 12 still short and if not is the other end of L2411 showing the short.
thanks for joining in the party mr b
when L2411 Lifted it measures 240 ohm .so not short but still a bit lower than i would expect ,what do you think?
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Old 12-12-2021, 09:28 AM   #11
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Default Re: lg 47LB585V help to identify ic please

Are you saying L2411 has a resistance of 240 ohms or the output of the IC (1.5V ) to ground measured 240 ohms.
What is the resitance with the meter on one pad of L2411 to ground and again what is the reistance from the other pad of L2411 to ground both checked with L2411 lifted.
If the resistance of the IC2403, pIns 10, 11 & 12 is 240 ohms to ground then that would appear to be OK.

Last edited by dick_barton; 12-12-2021 at 09:45 AM..
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Old 12-12-2021, 10:22 AM   #12
jimbofz
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Default Re: lg 47LB585V help to identify ic please

the o/p of the coil when lifted is 240 ohm to deck ie the 1,5v supply 240 ohm
the other side is dead short to deck i know the tps54319 is duff
but i would expect a much higher value on the 1.5v o/p side
the coil itself is fine very low ohms
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Old 12-12-2021, 11:30 AM   #13
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Default Re: lg 47LB585V help to identify ic please

The 240 ohm reading would appear to be fine and is not a high load on the 1.5V supply
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Old 12-12-2021, 11:53 AM   #14
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Default Re: lg 47LB585V help to identify ic please

ok thats reassuring .ive found a scrap pana main board with similar ic so im going to practice removing and refitting on this .what is interesting is on the pana main board the o/p pins 10,11,12 read 3.9k to deck
i know all ccts differ so best not to read into this too much ,
i think the board came from a pana TX-L 32C5B
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Old 12-13-2021, 05:01 AM   #15
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Default Re: lg 47LB585V help to identify ic please

You may well be correct. Just looking at the application note show there are two mosfets connected in totem pole so the 240 ohms could well mean that one of the internal mosets is damaged.
Good luck with your repair. Use plenty of flux with the solder and be patient.
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Old 12-13-2021, 07:47 AM   #16
jimbofz
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by lotas View Post
ic2403 - TPS54319
a question for lotas
do you know if:
0101
5173
is same device ?
ive found one on a panasonic tx-l32c5b main board
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Old 12-13-2021, 08:11 AM   #17
lotas
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by jimbofz View Post
a question for lotas
do you know if:
0101
5173
is same device ?
ive found one on a panasonic tx-l32c5b main board
"5173" - This is your G5173.
Check datasheets. Your family should be marked "54319".
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Old 12-13-2021, 08:21 AM   #18
jimbofz
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Default Re: lg 47LB585V help to identify ic please

wow thanks for quick reply
it looks the same BUT its o/p is: 1.8v not 1,5v
its markings are :0101
5173
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Old 12-13-2021, 09:27 AM   #19
lotas
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Default Re: lg 47LB585V help to identify ic please

Quote:
Originally Posted by jimbofz View Post
wow thanks for quick reply
it looks the same BUT its o/p is: 1.8v not 1,5v
its markings are :0101
5173
Their output voltage is set by a resistor divider.
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Old 12-13-2021, 09:56 AM   #20
lotas
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Default Re: lg 47LB585V help to identify ic please

To test the mainboard, you need to dismantle the TPS54319 and connect an external laboratory power supply (+) to the L2411 with 1.5V - 2A.
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