T-con Samsung identifying problem

[wilson_campbell]

Re: T-con Samsung identifying problem

I would imagine the panel itself is defective,stressing the T-con,which then,in turn,fried the smd on the psu..see if the voltage rises at the t-con with the ribbon cables disconnected.
In view the replacement t-con only lasted 2 mins,i would say without certainty the panel has met it's maker....but i digress..

The panel was fine before the bad caps problem on the power board.

See my thread:

https://www.badcaps.net/forum/showthread.php?t=48472

The problem that effected the t-con was a short on pnp after I redid the solders on it. The glue around it had become conductive due to the heat when soldering and shorted the regulator. Would it not be extremely unlucky for the panel to suddenly have a problem given this and that fact it was OK for two minutes until the second hand t-con went faulty and there is proof that the second hand t-con is faulty due to voltage tests ?

[fzabkar]

Re: T-con Samsung identifying problem

AFAICT, the OP's TV uses the following PSU (BN44-00221A):

https://flattvparts.co.uk/images/sam...-%20REV1.0.jpg

The ratings printed on the PCB are:

12V 1.1A
Vamp 0.6A
ST-BY 0.6A
24V 5.1A
5.3V 2.0A

How much current would need to be drawn from a 12V/1.1A supply in order for the voltage to drop by 3V? If it's not the panel that is responsible, then surely something on the T-Con must be hot to the touch.

[wilson_campbell]

Re: T-con Samsung identifying problem

I would imagine the panel itself is defective,stressing the T-con,which then,in turn,fried the smd on the psu..see if the voltage rises at the t-con with the ribbon cables disconnected.
In view the replacement t-con only lasted 2 mins,i would say without certainty the panel has met it's maker....but i digress..

There is no no difference in voltage when panel cable removed.

[steviewonder]

Re: T-con Samsung identifying problem

The LTA32AP06 panels are notorious for failures....not sure though if your set uses one of those...

[steviewonder]

Re: T-con Samsung identifying problem

I would imagine the panel itself is defective,stressing the T-con,which then,in turn,fried the smd on the psu..see if the voltage rises at the t-con with the ribbon cables disconnected.
In view the replacement t-con only lasted 2 mins,i would say without certainty the panel has met it's maker....but i digress..

[vinceroger69]

Re: T-con Samsung identifying problem

There is another white label internally on the internal frame:

96-06958A coral AMLCD

is that it?

yes thats the details needed im sure budm will advise when he sees this thread update.

[wilson_campbell]

Re: T-con Samsung identifying problem

found this document that seems to be the spec relating to T315XW02

https://cdn.badcaps-static.com/pdfs/...ed0b2359bf.pdf

[wilson_campbell]

Re: T-con Samsung identifying problem

Got this from the service manual:

M0215 BN07-00511A LCD-PANEL;T315XW02 VL,8bit,32inch,16.7M, 1 S.A

Spec on service manual shows:

Specifications
Item Description
LCD Panel TFT-LCD panel, RGB vertical stripe, normaly black, 32-Inch viewable,
0.51075(H) x 0.51075(W) x 3 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 80 kHz (Automatic)
Vertical : 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.7 million colors
Maximum resolution Horizontal : 1366 Pixels
Vertical : 768 Pixels
Input Signal Analog 0.7 Vp-p ± 5% positive at 75Ω , internally terminated
Input Sync Signal H/V Separate, TTL, P. or N.
Maximum Pixel Clock rate 80MHz
Active Display
Horizontal/Vertical
27.47 x 15.44 inches (697.68(H) x 392.26(V)mm)
AC power voltage & Frequency AC 110V ~ 240V, 50/60 Hz
Power Consumption <180 W ( < 1W, stand by )

[wilson_campbell]

Re: T-con Samsung identifying problem

Only other number on white label apart from serial number is

Bn68-01176a-00

There is another white label internally on the internal frame:

96-06958A coral AMLCD

is that it?

[wilson_campbell]

Re: T-con Samsung identifying problem

no neither of them are it basically if we can find what the lcd panel is we can look what voltages etc the tcon needs hence budm asking for it

Only other number on white label apart from serial number is

Bn68-01176a-00

[vinceroger69]

Re: T-con Samsung identifying problem

no neither of them are it basically if we can find what the lcd panel is we can look what voltages etc the tcon needs hence budm asking for it

[wilson_campbell]

Re: T-con Samsung identifying problem

budm i think means what is the actual number of the lcd panel used in the set this is usually on a white sticker on the metal chassis on the back of the tv.

thanks for tip:

only other number I see is the model code:

LE32A457C1DXXU

[wilson_campbell]

Re: T-con Samsung identifying problem

Sorry, I'm stumped.

ISTM that 11V is an odd input voltage. I have little experience with flat panel TVs, but AFAICT 12V is the nominal supply voltage for most sets. Are you sure that your PSU has been correctly repaired?

AIUI, your static load resistances on the AVDD supply are 4.6K with the panel connected and 7.5K with the panel disconnected. Obviously the panel must be presenting a much lower resistance when it is powered up, so these readings are inconclusive. Assuming it is safe to run the set with the panel disconnected, I would see how the voltages behave when the set is powered up without the panel.

Your second set of readings are a little confusing. You now measure 9V at AVDD, yet in your first post you measured 9V at F1 and 9.9V at SD1. Note that you should get different voltages on either side of SD1. It is not clear where you are measuring these voltages. Also, if the booster is working, then the voltage at AVDD should be a lot higher than the voltage at F1.

The readings for the "second hand board" are also confusing. If AVDD is sitting at 0.5V - 1.9V, then this would suggest that SD1 is shorted or leaky.

If I remove the fuse at f1 the voltage measurement coming into the the unit is 12v. Once the fuse is in place it then drops. I am therefore assuming that the voltage being delivered to the t-con is correct but the t-cons are then somehow effecting it and not drawing the same power down from the PSU. Also for the second hand t-conn board it did work for about 2 minutes and then I am assuming when it started to heat up a component failed (failed soak test).

I will try the voltage readings without the panel and post them to see if it helps

[vinceroger69]

Re: T-con Samsung identifying problem

budm i think means what is the actual number of the lcd panel used in the set this is usually on a white sticker on the metal chassis on the back of the tv.

[wilson_campbell]

Re: T-con Samsung identifying problem

What is the LCD panel model number?

Hi,

The tv is an LE32A457C1D

[budm]

Re: T-con Samsung identifying problem

What is the LCD panel model number?

[fzabkar]

Re: T-con Samsung identifying problem

Sorry, I'm stumped.

ISTM that 11V is an odd input voltage. I have little experience with flat panel TVs, but AFAICT 12V is the nominal supply voltage for most sets. Are you sure that your PSU has been correctly repaired?

AIUI, your static load resistances on the AVDD supply are 4.6K with the panel connected and 7.5K with the panel disconnected. Obviously the panel must be presenting a much lower resistance when it is powered up, so these readings are inconclusive. Assuming it is safe to run the set with the panel disconnected, I would see how the voltages behave when the set is powered up without the panel.

Your second set of readings are a little confusing. You now measure 9V at AVDD, yet in your first post you measured 9V at F1 and 9.9V at SD1. Note that you should get different voltages on either side of SD1. It is not clear where you are measuring these voltages. Also, if the booster is working, then the voltage at AVDD should be a lot higher than the voltage at F1.

The readings for the "second hand board" are also confusing. If AVDD is sitting at 0.5V - 1.9V, then this would suggest that SD1 is shorted or leaky.

[wilson_campbell]

Re: T-con Samsung identifying problem

ISTM that the panel may be loading the AVDD supply.

The T-Con PCB with the higher input voltage (11V) appears to have a failed AVDD regulator whereas the T-Con that is loading the input appears to have a working AVDD supply. Assuming that the AVDD rail powers the panel, this would point to the AVDD rail and/or the panel as the culprit.

I would measure the resistance between AVDD and ground, with and without the panel connected.

Any ideas about the readings

[wilson_campbell]

Re: T-con Samsung identifying problem

ISTM that the panel may be loading the AVDD supply.

The T-Con PCB with the higher input voltage (11V) appears to have a failed AVDD regulator whereas the T-Con that is loading the input appears to have a working AVDD supply. Assuming that the AVDD rail powers the panel, this would point to the AVDD rail and/or the panel as the culprit.

I would measure the resistance between AVDD and ground, with and without the panel connected.

Original board readings:
Resist with panel cable connected: 4.65 Resist without panel cable: 7.5
AVDO: 9v
VOFF: -7.5
VSS: -7.5
VON: 7.7
VOFF: 0.7
VDD: 3.3

Second hand board:
Original board readings:
Resist with panel cable connected: 4.69 Resist without panel cable: 7.6
AVDO: moving from 0.5 to 1.9
VOFF: moving from -0.2 to -2.14
VSS: moving from -0.2 to -2.14
VON: moving from 0.17 to 3.0
VOFF: moving from -2.5 to +0.4
VDD: 3.3

I am assuming I did the resistance check correctly. Black to frame for ground, red to AVDD test point. Resistance setting on multimeter set to 20K to get a reading.

[wilson_campbell]

Re: T-con Samsung identifying problem

ISTM that the panel may be loading the AVDD supply.

The T-Con PCB with the higher input voltage (11V) appears to have a failed AVDD regulator whereas the T-Con that is loading the input appears to have a working AVDD supply. Assuming that the AVDD rail powers the panel, this would point to the AVDD rail and/or the panel as the culprit.

I would measure the resistance between AVDD and ground, with and without the panel connected.

will measure it tonight when I get back + other test points