Sharp Aquos LC-32D40U - no image

[ahickman]

Good day! Just found an older LCD in the dump (Sharp LC-32D40U) and plugged it in. I get backlighting (blue screen) but see no images or sound. When I press the Menu button (or any other buttons excepting PWR), I get no response. The service manual is accessible http://elektrotanya.com/sharp_lc-32d.../download.html but I am unsure as to where to start troubleshooting. Seems like a T-con issue perhaps? I removed the T-con and visual looked it over. 3A fuse was good and no burned items. Suggestions of what to troubleshoot would be appreciated.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Suggestions of what to troubleshoot would be appreciated.

Start with clear focused top down pictures of all your boards following my sig file below exactly. We want pictures in this composition.

https://www.badcaps.net/forum/showpo...94&postcount=1

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Right! Snapping a few pics now.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Power supply, t-con, tuner and inverter. Scaler is on its way.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Did you replace the caps with Panasonic caps or did you find it this way?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Found it as-is.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

Found it as-is.

Lucky you. At least you don't have to recap it if/when it works.

[retiredcaps]

Re: Sharp Aquos LC-32D40U - no image

1) On the t-con board, check the VCC (5V) test point just by the F1 fuse.

2) Check to see if the voltages on the main board are okay.

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.

[infringer]

Re: Sharp Aquos LC-32D40U - no image

Did you try unplugging and reseatting the cables? Oddly with bad audio and video I used to always go for the main board until my last TV it was the TCON but I wouldn't even get backlights ... So you are at least getting a BLON signal I assume. Anyhow I wish I could help further but this would be the quickest fix I am aware of indeed do do power tests if reseatting cables does not aid... Wish you luck.

[momaka]

Re: Sharp Aquos LC-32D40U - no image

There's a few test points on the t-con that you should check the voltage on:
VCC+5V, VDD, VGL, VGH, SDRAM_VDD, VLS, 3V, SSC_VDD, D-VDD, and S_VDD(?)
Check with respect to ground. Let me know what voltages you get.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

I have reseated the cables around the T-con and PS. No luck. Checking the voltages today.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Ok, the T-con board is under the main shell, separate from the major boards and very difficult to get to while cables are connected. I measure the 32 pins along the connector CP7203 which extends into the T-con board. This 32 pin cable is serviced by the scaler board. Voltages are below. Pins that show 0.0V (GND) are skipped.

1. -
2. - 5.32
3. - 5.32
4. - 5.32
5. - 5.32
10. - 0.0
13. - 1.43
14. - 1.17
16. - 1.42
17. - 1.06
19. - 1.38
20. - 1.12
22. - 1.22
23. - 1.27
25. - 1.42
26. - 1.08
29. - 3.27

[ahickman]

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

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

CP3201 on scaler board which comes from the main board reads as follows:

1. 11.8
2. 8.8 V
3. 5.3 V
4. 3.4 V
5. 4.2 V
6. 4.2 V
10. 5.1 V
11. 5.0 V

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

CP511 coming off main PS board read as follows:

1. 5.3
2. 5.3 V
3. 5.2 V
7. 11.9 V
8. 11.8 V

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

CP510 coming off main PS read as follows:

1. 8.9 V

[budm]

Re: Sharp Aquos LC-32D40U - no image

So F1 fuse on the T-CON board is OK (since the 5Vdc feeding it from the cable is OK)?

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Both sides of F1 show 5 VDC.

[momaka]

Re: Sharp Aquos LC-32D40U - no image

Not to sound negative, but I doubt those voltages can be of much use in terms of troubleshooting. You really need to get the voltages at those test points I mentioned in order to see if the T-con is working properly.

I'm not very familiar with the layout of the TV, but if needed, use cardboard or plastic sheets to insulate the boards from each other and run the TV that way if you can to get those measurements.

[ahickman]

Re: Sharp Aquos LC-32D40U - no image

Kinda working on too much here and just got back to this one. This evening I plugged a DVD player into the Component 1 jacks and got audio, but still no video. This tells me that the main board is OK, correct? Just need to spend my time looking at the T-con and scaler boards?