Re: Sony 4k TV XE8004 series backlight main board issue
The wire into pin 1 controlling backlights has been removed from the connector block and taped back just in case and did wonder about the multilayer board if something had gone OC. Didnt see point in attempting reball when everything else was ok if MB fails in time it can be replaced at that time and resistor removed no hassle.
Have run the set for 12 hours straight and apart from not connecting to wifi for a a few minutes (now working stable) it all works really nice and cracking image indeed its first Sony 4K...
CuriousJohn
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Last Activity: 02-07-2023, 07:48 AM
Joined: 12-25-2018
Location: Britain
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Re: Sony 4k TV XE8004 series backlight main board issue
Ok had good result today the TV is up and running very well... I found the right pin to switch backlights on without any invasive action this will run the TV until or if the Mainboard does die but it has no other faults detected so far. See photo for solution, no backlight on signal from main IC so on power distribution board LD1 connected 1K resistor between Power up signal and backlight signal on CN3000 connector and it works a treat but not for the purists lol do it at your own risk i had to follow it all back carefully...Last edited by CuriousJohn; 02-23-2020, 01:34 PM.Leave a comment:
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Re: Sony 4k TV XE8004 series backlight main board issue
Hi thanks for reply, did some local heating with hot air carefully in attempt to reflow i think i said reball in op but got those two concepts mixed up and that totally killed the backlights anyway so havent removed the IC that would be the next step I guess and a first for me but im here to learn, might try another reflow before i do reball :-)
Last night i had a good look at the power distribution board im trying to determine the way the inverter is controlled to trace back the signal but as you say its sounding...Last edited by CuriousJohn; 02-22-2020, 04:48 AM.Leave a comment:
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Sony 4k TV XE8004 series backlight main board issue
Hi folks another doozie here,
Got this TV on my table this week and at first suspected a simple failing LED on the back lights as symptoms where backlight coming on at power up and within a few minutes flickering then failing other than that TV works fine.
This set is side lit and noted sometimes the flickering would start right away even during boot, after testing found backlights + inverter good. To cut a long story short found that applying pressure to specific spot on mainboard heatsink caused backlights to come on or off and even moving chasis about caused this other... -
Re: Samsung JU6000 panel issue post backlight repair
For the record this lasted a day as lines returned and liquid crystal started leeching turns out there was a fracture up the right side of the panel an inch from the edge as with some light pressure of my fingers i pushed it in with a snap and that was the end of this TV. I will never leave a panel out longer than a day from now on.Leave a comment:
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Re: UE40EH5000KXXU No power completely dead
Had some good learning and practice on this set so far the mainboard has multiple problems the first being this melted Z1051PI which i have now restored but it might not look pretty to the more skilled tho its electrically sound, it was melted so bad i had to repair the track underneath using a thin sliver of copper. See photo below.
The new Z1051PI now provides 3.3v out however the set is still dead. Thanks to the Service manual power tree discovered IC202 a sop23 npn transistor has failed taking the minicom with...Leave a comment:
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Re: Samsung JU6000 panel issue post backlight repair
Thanks for replies have had success took bezel off again today and found two side tabs clearly faulty as manipulating them caused lines and panel short so clearly they been damaged whilst panel was out to long, lesson learned. Glad to report panel is restored thanks to Tabs on BOTH sides.
Still looking for good learning on panel theory if anybody knows of a recommended ebook etc my books are 20+ years out of date now
those aliens have no appreciation for relative passage of time away form earth...
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Re: Samsung JU6000 panel issue post backlight repair
yeah tabs on both sides.Leave a comment:
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Samsung JU6000 panel issue post backlight repair
Hi folks I really would appreciate help on this one as the panel was working fine before removal and i never had such issues before. hope somebody can tell me the stupid thing i did or didnt do here....
This TV needed purple back lights replacing so did the work and upon re assembly the panel appears problematic, see photo below. Right side fades out with some horizontal white lines but they dont run entire length and a small vertical mess of lines far right from mid to bottom. I have noted when i apply pressure to the right side in the centre edge of the bezel the panel... -
Re: HP Pavilion 15-N096SA (U83) missing +12vALW
Ok i missed some things on my sheet like pin 6 and 7 for instance 3VSUS is peaking with the flashing power light between 0v to 1.6v could be higher my meter is basic i know all supplies coming in to chip are good.
problem appears to narrowed down to internal short of PU6 between Vin and ground as just replaced PR118 due to it being way out of tolerance some 1K when its a 22 ohm part (220) and still no VAD on PU6 side of it, PC145 defo not short removed for now and inspected tracks and pads for shorts using microscope....Leave a comment:
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Re: HP Pavilion 15-N096SA (U83) missing +12vALW
Ok scrub that last post lol
Cap is fine resistor is high out of circuit reading 1K it should be 22 ohm so todays lessons are remove the biggest suspect smd component first and dont forget to remember 15 ohm is not S/C even if the meter beeps like its short.
Cup of coffee and fit new resistor plus put cap back then, its the size of a damn flea!Leave a comment:
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Re: HP Pavilion 15-N096SA (U83) missing +12vALW
Cheers mcplslg123 i have just rechecked voltages ether side of pr118 and in fact Vin side is 0v so remembering its more likely for a cap to go SC than a Resistor going OC i just done what i should have done first time and measured continuity at junction of these. Long story short looks like PC145 is short to ground which means i get to fire up the new rework station, today is the day.
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Re: HP Pavilion 15-N096SA (U83) missing +12vALW
Thanks for the response i assure you i looked at PU6 for a long time, with ref to attached schematic of it with my findings can you see it? I need to look again at Pin 17 Vout not sure about that one. Also Vin according to data sheet should be 8v min so thats an issue to perhaps.
Data sheet: [url]https://cdn.badcaps-static.com/pdfs/44db24315d722160193fa60c828c330e.pdf[/url]
PU6 doesnt appear to be running its why i wiggle my finger at EC but not certain until I find this pesky +12vALW. I have seen mention...Last edited by CuriousJohn; 01-24-2020, 09:31 AM.Leave a comment:
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HP Pavilion 15-N096SA (U83) missing +12vALW
HP Pavilion 15-N096SA (U83)
Hi folks can you help me please find where +12vALW is generated as its missing and service manual is not helpful to locate it.
With ref to U83 schematic taken from this post: [url]https://www.badcaps.net/forum/showthread.php?t=47691[/url]
Symptoms are no start up, no lights anywhere but power button flashes when pressed but not fast fairly slow once every few seconds and there are no lights at all from the power socket so thats where i started and discovered the missing +12vALW. it seems to be absent all over the... -
Re: UE40EH5000KXXU No power completely dead
Got the same TV open on my table today and our friend the Z1051Pi has melted perhaps explaining the "not suitable for new designs". same symptoms standby light on, no video, backlights on when mains applied but no response from remote or keypad....Last edited by CuriousJohn; 01-23-2020, 05:22 PM.Leave a comment:
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Re: •• samsung * ku * range troubleshooting information ••
Im going to man soon as i get time watch this space.Leave a comment:
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Re: •• samsung * ku * range troubleshooting information ••
Any one?
The Tcon has its EEPROM and the panel driver has this EEPROM, the cynic in me wants to believe Samsung are coding there panels to the tcons to prevent repair or swop out but I resist there must be a better theory of operation. Why a SPI flash EEPROM on a panel driver!!Leave a comment:
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Re: •• samsung * ku * range troubleshooting information ••
Can anybody help please this curved samsung tv is still refusing to show video on the panel and has winbond spi chip on one of the four panel drivers which is perplexing me and cant find any info, why would a spi flash chip be there does anybody have any idea? It is a Winbond 25Q64FV and is receiving 3.3v as it should be but no idea if its working or not.Leave a comment:
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Re: •• samsung * ku * range troubleshooting information ••
Thanks budm I have put the SMD components back on i checked around no similiar circuit on other driver tabs all similiar smd components appear to be sc so links but no marking on them and no other appears to be connected in parallel with a cap straight to ground. Think I was chasing ghosts anyway as appear to have made an error in my last post.
With both of the far end panel drivers boards connected (A + D) the tv will not power up the tcon flahes its blue led once and powers down, with ether one of...Last edited by CuriousJohn; 12-10-2019, 08:41 AM.Leave a comment:
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Re: •• samsung * ku * range troubleshooting information ••
Maybe I wasnt so lucky to find this info before purchasing a spares or repair Samsung 55JU6740 that had symptoms of dead backlight or mobo so perhaps include "JU" as well depending....
Apologies for what might appear thread hijack happy to start a new thread but seems relevant here.
When powering on this TV the Tcon blue led flashes on for a second then goes off i suspect it does this to protect itself. By disconnecting one of the two ribbons from Tcon to panel the tv would...Leave a comment:
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