Re: samsung LA32C530 LCD TV not powering up (relay clicking)
sure. And what do you think about the original problem. do you think it could be just T-CON problem or might as well be a panel problem as the service guy said?
jork
Member
Last Activity: 03-06-2013, 09:56 AM
Joined: 02-27-2013
Location: bangalore
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
sorry for the delayed response. I had some broadband issue over the weekend.
I just checked the PWM_DIMMING once again. the Pin shows about .8V now, constant.
Do you think its a Main board problem still? I can try changing the main board, but just thought of making sure before spending money on that.
Also, just to state the original problem. It all begin with a double image on the screen (one regular image and a less bright shadow sort of image below) and when I disconnect one side...Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
yeah I did cut the BLU_ON also. It is showing 3.3V on PSU side and some .8 on MB side. The PS_ON on the main board side is varying from 3.3 to .2. Now I understand this was the frequency the other line voltages used to vary when I connect PS_ON to board. Why do you think the backlight is still not working? should it have something to do with the LAMP_DETECT. the line is showing something ~1.8V steady.Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
Hi Budm, I have tried exactly what you suggested. As you said, I'm seeing the PS_ON on PSU side having >3v. But the backlight is not turning on. It just blinks once and then stay off. When I switch off the outlet also, the backlight blinks once again.
One interesting thing I'm noticing with this is, all the 13v and 5v lines are steady now and the relay is not clicking anymore. but nothing happens when I try to switch on the TV. Also, the PS_ON on the main board side is showing some varying signals (fl...Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
I will definitely try that out today evening. Even I feel it could be a problem with the mainboard. but wanted to be sure as the powersupply voltage variation kept me thinking.
So, how do we debug the mainboard problem in more details if we want to. Now we know that the remote/touchpad input is being given to the MB. but mainboard is failing to take any action with that. If we know the exact logic flow, we could've traced that I guess.
also, is there anyway to get a service manual for this board. I...Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
yeah, thats what I observed. After connecting the resister, the behavior was exactly the same. Same fluctuations, no tv on or backlight on.Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
hey tom,
I tried pulling in the PS_ON with a 200ohm. but everything is same.Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
I will try that out and post the result. btw, can you tell me what is active low power on state? And I was wondering why would the voltage fluctuate, though powersupply seems fine as voltages are stable if i disconnect psu and MB. Or is that, the PSU is not able to sustain when a load is connected?Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
speakers were already unplugged. just now I tried putting back in. No difference at all. I guess the speaker line will will get activated only after the board boots up right? here, the board is not yet powered up. I tried sensing the ps_on during key press for poweron too. No difference.Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
No. the main 5v line which I think is marked as A5v1 doesn't vary. Also, the voltages on the IR panel pins also doesn't vary.
below are the voltage on PSU cable connector
A5v1: 5v always
B5v1, B5v2, B5v3: 0.1 - 5V varies
B13v1,B13v2,B13v3, B13vs1,B13vs2: 0.5 - 12.5 varies
LAMP_DETECT, SW_INVERTOR: 0 always
PWM_DIMMING : 0.1 - 1.5 varries
H_SYNC: 0.1 - 5 varies.
PS_ON: 0.1 - 0.9 varies
these are the voltages on IR panel PINS
IR_A3.3v,...Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
The PS_ON is varying but with very low values (from .02 to .9) again in sync with relay click. Just after the relay click the volages comes up to the rating and then start decaying. this is happening with 13v as well as 5V. But the 3V is stable. Also, one more thing I noticed is, after disconnecting the PSU from main board, all the voltages are stable and the backlight is working.Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
Hi Budm, I did disconnect the LVDS cable from the mainboard. No difference (no backlight, no tv on, the frontpanel led is not even blinking as a sign of turning on). Now I disconnect the mainboard, the backlight is back.
As I mentioned in the first post, I'm seeing a fluctuation on the 13v line. the voltage is varying from 1-13v and then going down slowly. The variation is somehow related to the relay click. Is this the way 13v line behave all the time or should it be constant?Leave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
The TV is an indian variant of LE32C530xxx.
Mainboard - bn94-08787a
PSU - BN44-00339C (this is same as BN44-00339A and compatible with C)
T-CON - XX94-J3256H
please let me know if you need me to post any more details or the photos of the board.
thanks,
joeLeave a comment:
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Re: samsung LA32C530 LCD TV not powering up (relay clicking)
thanks tom66 for the quick reply.
ok. it all started with a whole different problem. One fine day my TV started showing two images on the screen. One regular image and about 1inch below it, another less bright image- looking like a shadow of the first one. So, I did a routine service centre call. The guy came home and without even trying a bit on diagnosing the problem, blindly said you have to replace the panel. And the cost was absolutely not acceptable.
So, I thought let me give it a try....Leave a comment:
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samsung LA32C530 LCD TV not powering up (relay clicking)
Hello,
long story short, I bricked my TV :-(
Mine is a 2 year old samsung LCD TV, it is not powering on now. No response for the remote or the touch pad. I can hear a periodic relay clicking sound though. Initially I thought it could be the badcap issue. So checked the power supply board. there is no bad caps. I checked the voltage levels on the standby and the IR/touch pad key press responses on the PIN. the standby shows steady 3.3V. when I disconnect the mainboard with PSU, the backlight is on, otherwise no.
One thing I noticed is the 12v lines are fluctuating....
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