Sharp Aquos LC-32D40U - no image

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Just need to spend my time looking at the T-con and scaler boards?

momaka is the expert in the t-con area. I would listen to him as per post #19.

[ANDRASONI LUCIAN]

Re: Sharp Aquos LC-32D40U - no image

I would suggest to replace memory dump properly, for Sharp lcd tv, the memory dump compromise is a typical failure, Success, from Romania, Cluj, only better!

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Not at all familiar with the "memory dump". I assume you mean that the firmware is corrupt and needs to be reloaded?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Vcc = 5v
VGL = 0 v
VGH = 0 v
SDRAM_VDD
VLS = 0 v
3V = 0.7 v
SSC_VDD = 0.7
D_VDD = 0.7
D_VCC = 0.7
SV_DDD = 0.7

So, should I assume the 3 V regulation is shot? If so, which SMD?

Thanks,

Aaron

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

So, should I assume the 3 V regulation is shot? If so, which SMD?

Find the part number and datasheets for the following components on the t-con board: U300, Q302, and U5. My guess is it will be one of the first 2 that does DC-DC conversion?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

I have searched and searched for the datasheets based on the number. No success.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

List them and we will have a look. Selldoor is pretty good at finding them.

[momaka]

Re: Sharp Aquos LC-32D40U - no image

Vcc = 5v
VGL = 0 v
VGH = 0 v
SDRAM_VDD
VLS = 0 v
3V = 0.7 v
SSC_VDD = 0.7
D_VDD = 0.7
D_VCC = 0.7
SV_DDD = 0.7

A lot of voltages are missing on that list. Did you make sure the TV was turned ON when taking measurements? Because it just seems as if it turned OFF pretty much soon after you measured Vcc.

VDD, VGL, and VGH should always be there when Vcc is there.
VDD is usually something like 15-20V, VGL around -5 to -10V, and VGH 20 to 35V.
U300 should be the power controller for the t-con. See if you can read the numbers on top and post them here.

[electronicsurplus]

Re: Sharp Aquos LC-32D40U - no image

CP506 coming directly off the main PS reads as follows:

1. 23.9 V
2. 23.9 V
3. 23.9 V
4. 23.9 V
5. 23.9 V
12. 3.3 V
13. 3.2 V

Seems to be missing 5V Pon

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

U300 - 16 pin chip, numbers as they appear:

3687V
1H05N08

Q302 - 8 pin chip, numbers as they appear:

4422
8E5519

U5 - 8 pin chip, numbers as they appear:

ATMEL602
25F512AN

Q303 - 6 pin chip, numbers as they appear:

D5CD IF

Q301 - 6 pin chip, numbers as they appear:

D13D 1L

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Anyone able to help idenify the chips above please?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Anyone?

[momaka]

Re: Sharp Aquos LC-32D40U - no image

Anyone?

Well, keep in mind that people on this forum have lives too, so you need to give them more time to respond.
....
U300 is the t-con power supply controller. It likely controls VDD, VGH, and VGL.
Perhaps I should have written it more clearly in my last post, but you really *should* double-check those voltages I mentioned because it just seems like the TV was off when you tried to measure them. Either that, or somehow you didn't measure them correctly. Check your multimeter and make sure you're measuring with respect to ground.

Also, a few more clear pictures of the t-con would be helpful.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Well, keep in mind that people on this forum have lives too, so you need to give them more time to respond.

With rain pretty much all of June and some sun finally in July, I would much rather be outside enjoying the little summer we have in Canada rather than searching for part numbers all day.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Momaka,

Sorry, it is just so very rewarding to make progress on these sets and I am very dependent on the knowledge of this forum. It has been VERY hot here in VA and I find myself looking for such projects during the heat of the day.

I have snapped a few close-ups of the t-con board. Had to take sequential pictures in order to get decent resolution.

I retested the 3V pad and several others using one of the screws going to chassis as GND. Got the exact same voltages. I also used a heat sink on the secondary side of the PS as GND. No changes in voltages.

While I could blindly order the t-con board from ShopJimmy, I would rather have the satisfaction of learning more about troubleshooting the t-con. All help/guidance is greatly appreciated and I will try to be more patient

aaron

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

I have searched and searched for the datasheets based on the number. No success.

1) Wow, you may need to rethink how you are searching.

2) The very first search result for

3687V

leads to

http://www.alldatasheet.com/datashee...I/FA3687V.html

3) pin 6 = VCC and pin 11 is GND. What is the DC voltage on pin 6?

4) pin 13 is regulated output voltage. What is the DC voltage on pin 13?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Pin 6 = 5.31 VDC
Pin 13 = 2.31 VDC

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Pin 6 = 5.31 VDC
Pin 13 = 2.31 VDC

Depending on the accuracy of your multimeter and whether it is within calibration limits, this IC could be bad. According to page 7 of the datasheet, the regulated voltage (pin 13) should be 2.200V DC +/- 1% (between 2.178 and 2.222).

At 2.31V, it is 5% out. Is this enough to stop the t-con from working? I'm not 100% sure. If this were a "jellybean" 1117 voltage regulator, I would confidently say it is definitely bad at 5% out.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Pin 8 (Out2) = 5.31 VDC
Pin 9 (Out1) = 0.00 VDC

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

3) I can't tell from the pictures, but see if the are any voltage regulators on the main board and see if they are within spec.

Did you follow up on this from post #8?