Re: Technika LCD42-910 Stuck in standby
IO board is what I was after. How hard would it be for you to check each pin?
IO board is what I was after. How hard would it be for you to check each pin?
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Re: Technika LCD42-910 Stuck in standby
I guess knowing the process would be the main issue. Would you want me to check the voltages across each pair? My electronics knowledge is sketchy to say the least.Comment
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Re: Technika LCD42-910 Stuck in standby
Your meter should be set on DC200V.
Measure each pin... try to follow any board numbering if that's not available then just be consistent in whatever pattern you use.
Note & post the reading here.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Technika LCD42-910 Stuck in standby
Taking the schematic I posed before (), do you mean checking the voltages across, say, pins 1 and 2 and repeat for each pair?
Would I remove all other connectors for this, or do they have to remain in place?Comment
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Re: Technika LCD42-910 Stuck in standby
Test 1 relative to case.
Test 2 relative to case.
etc.etc.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Technika LCD42-910 Stuck in standby
Well, here goes. I measured from the back of the pin.
With all boards disconnected:
1 - 0
2 - 0
3 - 0.8
4 - 0.8
5 - 0
6 - 0
7 - -0.1
8 - 0
9 - 0
10 - 14.3
11 - 14.3
12 - 14.3
13 - 4.2
14 - 4.2
15 - 4.2
16 - 4.2
17 - 3.3 (5.0 sometimes!)
18 - 3.3 (5.0 sometimes)
19 - 3.3 (5.0 sometimes)
20 - 3.3
21 - 3.3
22 - 3.3
23 - 0
24 - 0
25 - 29.0
26 - 29.0
27 - 0
28 - 0
With all boards connected:
1 - 0
2 - 0
3 - 0.8
4 - 0.8
5 - 2.0
6 - 2.0
7 - 0.5
8 - 0.5
9 - 0
10 - 0
11 - 0
12 - 0
13 - 4.2
14 - 4.2
15 - 4.2
16 - 4.2
17 - 0.5
18 - 0.5
19 - 0.5
20 - 0.5
21 - 0.5
22 - 0.5
23 - 0
24 - 0
25 - 0 (seemed to peak at 29.0 and drop to 0)
26 - 0 (seemed to peak at 29.0 and drop to 0)
27 - 0
28 - 0
I had quite some variations in these measurements, but those are the most consistent I got. Changes to the values happened when I switched the TV on using it's on set button, and after about 30 seconds following a high pitched whining noise. Hmm.Comment
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Re: Technika LCD42-910 Stuck in standby
I'm thinking main board issue. Just checking, did you use volts DC?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Technika LCD42-910 Stuck in standby
Yes (solid line, dotted line), and I made sure I was testing right by googling the process, so I'm fairly happy with what I got. Couldn't quite get why pins 25 and 26 dropped dramatically after about 30s though. Not much like the numbers on the schematic.Comment
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Re: Technika LCD42-910 Stuck in standby
29V on 24V tells me that your meter battery is probably low or dead... it needs replacement. As a multimeter battery runs flat, readings begin to rise.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Technika LCD42-910 Stuck in standby
Right, I'll do that then. Maybe check the voltages again after.
So it looks more like the main board rather then the power supply?Comment
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Re: Technika LCD42-910 Stuck in standby
Since PSU is producing what looks to be OK voltages, yes, it looks to be more main board than PSU right now.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Technika LCD42-910 Stuck in standby
No, afraid not yet. Getting parts is not easy. I may well have put poor caps on the psu. Did that before I came on here
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Re: Technika LCD42-910 Stuck in standby
i changed some caps on the psu, now the fault has changed the LCD is complete stuck in standby clicks on then off with a couple of secs and the psu still buzzing from the relay unit which clicks over nightmare .Comment
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Re: Technika LCD42-910 Stuck in standby
hi any idea coz i have the same problem
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Re: Technika LCD42-910 Stuck in standby
i have multimiter and i have knowledg on electronic part can any one help me to sort out this problem plsComment
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Re: Technika LCD42-910 Stuck in standby
Hi,have the same problem here,any help would be much appreciated.Comment
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Re: Technika LCD42-910 Stuck in standby
hi,have the same problem on my board.
replaced the capacitors and I got the same buzzing sound.
have you found out what is the problem ?Comment
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Re: Technika LCD42-910 Stuck in standby
hello,after I took the logic board off and try to power on ,but after a few seconds shut off on goes in standby mode again .
I managed to take some measurement on PL816 and all are good just one the number 13 should be +33v and I have no reading .
Someone would tell me the next step would be please ???Comment
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Hello
I have an TV Led 4K Selecline 65s18 with mainboard T.MS3458.U801
The TV is faulty with stuck in Standby RED LED. Can't power the TV.
Before this problem , the TV stuck the picture with artefact , i unplug the AC cable and since the tv is stuck in standby .
All voltage are OK on PSU and main board for regulator. I tried flash firmware 25Q64 with many dumps
But the voltage on power button is 0.6V not 3.3V. When i press power button the voltage up to 0V. I tried to add 5V with Power Supply on 5V_STB and 3.3V on Power... -
Hi. I have the following problem with my TV. After connecting to mains, the standby led (red) turns on, but TV is not responding to remote control or buttons on TV. After some measurements, I found out that +5 V standby voltage is present, but I dont have ON/OFF signal coming in to turn PSU on. It stays at zero volts. After looking at the schematic of the mainboard, I should get ON/OFF signal coming in at the R1402 resistor, but it stays around +3,5 V. So I removed it and I was able to turn on TV with buttons on TV, but not with remote control.
What could be the problem ? Thanks...01-21-2024, 03:39 AM -
Hi techs, I have a Samsung ua39eh5003r which switches on and then goes to standby. I have to wait for a day or two for the tv to switch on again, all the time it is stuck on standby. I have checked the voltages on the power supply board on both occasions when it is on and off and these are my findings:
Connector CNM803:
TV ON
Pin1,3,4,5(Vamp),7(Vamp)- 12.6V; Pin2(PWM_DIM)- 0.96v; Pin6(BLU_ON/OFF)- 4.41v; Pin8,9,10- grnd; Pin11,12,13- 5.16v; Pin14(Power ON/OFF)- 3.3v
TV OFF
Pin1,3,4,5(Vamp),7(Vamp)- 12.6V; Pin2(PWM_DIM)- 0.06v; Pin6(BLU_ON/OFF)-...09-18-2021, 11:51 AM -
When the Main board is disconnected, the back lights are off but tapping on the chassis makes them light up and all voltages are then good. Connecting the main board up makes the TV work normally until moved. LED INERFACE STRIP BN41-01971A has a short on the first 2 pins on the left of the picture, the cable tests good. All the other pins and all LED strips test good. Is there an easy way to fix the short or do I need a new interface. Any help would welcome.
PSU number bn44-00610A L46SF_dpn
1 B13v 12.4
3 B13v 12.4
5 Vamp 12.4
7 Vamp 12.4
9 GND... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
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