Re: Samsung UE26D4003BW stand-by light blinking
I noticed the heatsink on the vpu gets very hot, is it suppose to get that hot?
Pappel
Member
Last Activity: 04-08-2025, 08:45 AM
Joined: 11-06-2014
Location: Tallinn
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Re: Samsung UE26D4003BW stand-by light blinking
yes they disappear, only A5V stays at 5.18V
Also the standby light blinking pattern is differentLeave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
measured with everything connected:
[B]1.[/B] B13V - 12.82V _____ [B]2.[/B] PWM_DIM - 0.08V
[B]3.[/B] B13V - 12.82V _____ [B]4.[/B] N. C/LCD : H -- Sync - 0V
[B]5.[/B] Vamp - 12.83V _____ [B]6.[/B] BLU On/Off - 0.04V
[B]7.[/B] Vamp - 12.83V _____ [B]8.[/B] GND
[B]9.[/B] GND _____ [B]10.[/B] GND
[B]11.[/B] B5V - 5.17V _____ [B]12.[/B] A5V - 5.17V
[B]13.[/B] B5V - 5.17V _____ [B]14.[/B] Power On/Off - 3.30VRe: Samsung UE26D4003BW stand-by light blinking
measured with everythingLeave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
Measured the voltages of the regulators on mainboard:
1. 1117Z 1139DG (pin1 - [B]0.26V[/B], pin2 - [B]1.51V[/B], pin3 - [B]3.26V[/B])
2. N434 950T45 (pin1 - [B]3.27V[/B], pin2 - [B]0V[/B], pin3 - [B]2.5V[/B])
3. 78M09A (pin1 - [B]12.75V[/B], pin2 - [B]0V[/B], pin3 - [B]8.85V[/B])
4. KIA 7805AF 127 (pin1 - [B]8.84V[/B], pin2 - [B]0V[/B], pin3 - [B]4.98V[/B])Re: Samsung UE26D4003BW stand-by light blinking
Measured the voltages of the regulators on mainboard:
...Leave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
yes, that cable was disconnectedLeave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
if by lvds cable you mean the one from mainboard to t-con, then disconnecting this and leaving mainboard connected to psu doesn't make a difference, same blinks, no backhlight or any sign of lifeLeave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
yes, psu was disconnected from the mainboard and the backlight was onLeave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
measured the voltages:
[B]1.[/B] B13V - 12.81V _____ [B]2.[/B] PWM_DIM - 3.01V
[B]3.[/B] B13V - 12.81V _____ [B]4.[/B] N. C/LCD : H -- Sync - 0V
[B]5.[/B] Vamp - 12.81V _____ [B]6.[/B] BLU On/Off - 2.1V
[B]7.[/B] Vamp 12.81V _____ [B]8.[/B] GND
[B]9.[/B] GND _____ [B]10.[/B] GND
[B]11.[/B] B5V - 5.18V _____ [B]12.[/B] A5V - 5.18V
[B]13.[/B] B5V - 5.18V _____ [B]14.[/B] Power On/Off - 3.07VRe: Samsung UE26D4003BW stand-by light blinking
measured the voltages:Leave a comment:
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Re: Samsung UE26D4003BW stand-by light blinking
I want to try resetting the eeprom, but i'm having trouble identifying the eeprom chip, does seem like it's the "Winbond 25X40BVSIG 1143" (marked with red) or the "ATMLH142 2ECL Y 1G8213" that also seems to have 4 debugging connectors on top of it (marked with yellow)....Last edited by Pappel; 11-10-2014, 10:13 AM.Leave a comment:
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Samsung UE26D4003BW stand-by light blinking
Hi!
I've had this TV collecting dust on shelf for a while now, thought i'd give it another look. When i last time worked on it, main board was suspected faulty.
Thought i'd post this here to be sure.
The symptoms are: stand-by light flashing 6 times when plugging the TV in. Nothing comes up and no reaction from the buttons. Caps on the SMPS board seem to be ok.
Also backlight does turn on when mainboard is disconnected.... -
Re: LG 32LB2R flickering horizontal lines
I haven't been able to find anything, all the diodes seem ok. I'm gonna go ahead and replace the little 35V 47uF, 50V 33uF and 50V 4.7uF caps aswell.
Also, do the output schottky diodes suppose to get that hot? The heatsink gets very hot.Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
I found a shorted diode...
or not... have to check them out of the circuitLast edited by Pappel; 11-08-2014, 10:16 AM.Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
There isn't much going on on the 19V rail after the optocoupler that also feeds the inverters. some SMD resistors, diodes, zener diodes
marked the trail with red
[URL="https://www.badcaps.net/forum/attachment.php?attachmentid=98672&stc=1&d=1415459228"]https://www.badcaps.net/forum/attachment.php?attachmentid=98672&stc=1&d=1415459228[/URL]Re: LG 32LB2R flickering horizontal lines
There isn't much going on on the 19V rail after the optocoupler that also feeds the inverters. some SMD...Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
If it's the 19V rail, shouldn't it affect the backlight aswell since it runs from the same rail? Unless the fault is between the octocoupler and the 19v output
[URL="https://www.badcaps.net/forum/attachment.php?attachmentid=98664&stc=1&d=1415453036"]https://www.badcaps.net/forum/attachment.php?attachmentid=98664&stc=1&d=1415453036[/URL]
This optocoupler or the 35V 47uF cap maybe?
Also the blown caps and the noise source must be related since the lines or static from...Last edited by Pappel; 11-08-2014, 07:30 AM.Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
Well i did clean the t-con board flex cables but i dont have time to assemble it today.
But i just thought it's kind of a long shot, wouldn't explain the static from speakers...
will continue tomorrowLeave a comment:
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Re: LG 32LB2R flickering horizontal lines
Ooh, new information! I'm by no means an expert at TVs, didnt even think of looking behind the metal shields. Will get right on it and post my findings or results.
Thank you!Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
Checked all the connections, they're all ok. Also there is no flat cables in the system.
I'm suspecting that the component that is causing the ripple/noise is also responsible for the blown caps that i replaced in the output section.
Can the output schottky diodes act like this? Because it seemed like heating the area where the blown caps are, made the flickering calm down quicker, behind those caps is the diode.Last edited by Pappel; 11-07-2014, 10:06 AM.Leave a comment:
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Re: LG 32LB2R flickering horizontal lines
Replaced the 450V 68uF filter cap, no change. I've now changed almost all the caps on the SMPS board, except the inverter output caps. I'm thinking it's not caps causing this but something else.. clearly somekind of signal noise. There is a 35V 470uF cap on the main board, located near the speaker outputs. Im gonna try to heat parts of the board and see if i see decease in time it takes to calm down the lines and static noiseLast edited by Pappel; 11-07-2014, 09:34 AM.Leave a comment:
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LG 32LB2R flickering horizontal lines
Hi all!
I've been struggling with this TV for 2 days now and i can't seem to find the problem.
It had other issues when i got to it, first it wasn't turning on, kept blinking red light and after about 5 minutes it turned on. Once it turned on, there were big coloured vertical lines in sections on the screen. I took it apart and saw 2 bulged capacitors on the SMPS output side:
[URL="https://www.badcaps.net/forum/attachment.php?attachmentid=98587&stc=1&d=1415359886"]https://www.badcaps.net/forum/attachment.php?attachmentid=98587&stc=1&d=1415359886[/URL]... -
Re: New Members - please post your introductions here
Hey everyone!
I've been stumbling across this forum tons of times while googling electronics troubleshooting or repairs, so i figured i might aswell try and give something back for the knowledge and solutions gotten from here.
About me, i'm 24 year old guy from Estonia, been working at and managing a little electronics and computers repair workshop. I have specialized on computers mainly but i find electronics just as interesting. I have graduated from school with computer science major and my little electronics...Leave a comment:
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