Sharp LC-60EQ10U - powers on but no glow

[joeblah]

Hello all,

Sharp LED LCD LC-60EQ10U

Anyone have a service manual for this model? Haven't had any luck finding one.

Initially, this set would not power on. I replaced the main board (QPWBXG381WJZZ) and now it will power on (front LED remains lit) but the screen is black (no glow).

I searched for "LC-60EQ10U" in the threads and tried some of the recommendations. Holding down the POWER+MENU buttons for 5 seconds while plugging in the AC results in a flashing front LED. Looks like a 'pulsating' flash gradually increasing/decreasing intensity fairly rapidly (maybe once per second or faster).

Disconnecting the 4 ribbon cables from the TCON board allows the LED strips to glow (I can see them glowing from the backside) but it looks like the LCD is still black.

At L1, I'm getting 83V and 10V. 12V going to panel.

Any thoughts?

[dick_barton]

Re: Sharp LC-60EQ10U - powers on but no glow

If you shine a bright light on the screen can you see an image if you select menu and look very carefully. Do you have sound. What are the voltages on the 8 wires of L1 as you switch on. The voltages may peak but drop quickly so if you have a max/min function on your meter would be useful. Repeat switch on for each wire.

[dick_barton]

Re: Sharp LC-60EQ10U - powers on but no glow

Available for download but I haven't tried it.

http://archive.espec.ws/section332/page16.html

[budm]

Re: Sharp LC-60EQ10U - powers on but no glow

"Disconnecting the 4 ribbon cables from the TCON board allows the LED strips to glow (I can see them glowing from the backside) but it looks like the LCD is still black." The Dimming PWM for the backlights is from the T-CON board, so at this point is no allowing the Backlights to come on if PWM is sitting at 0V..
Are you getting PNL-12V feeding the T-CON board?

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

If you shine a bright light on the screen can you see an image if you select menu and look very carefully. Do you have sound. What are the voltages on the 8 wires of L1 as you switch on. The voltages may peak but drop quickly so if you have a max/min function on your meter would be useful. Repeat switch on for each wire.

I misspoke about the glow of the panel. The panel DOES glow (with TCON ribbons disconnected) but I can't see anything with the flashlight trick. No sound. Thanks for the service manual link.

Here are the L1 readings:
(L1-15) LED4-: 10.5V
(L1-13) LED4+: 83.5V
(L1-11) LED3-: 10.5V
(L1-9) LED3+: 85V
(L1-7) LED2-: 10.5V
(L1-5) LED2+: 85V
(L1-3) LED1-: 10V
(L1-1) LED1+: 85V

Are you getting PNL-12V feeding the T-CON board?

Yes, at PD pins 1 and 2 (PNL12V) I am getting 12V.

When I reconnect everything and turn it on, the front panel LED remains lit for maybe a minute, then it starts throwing a flash code. It looks like 3 "normal(?)" flashes, then 1 quick flash, then repeat. Based on the service manual, it looks like a P board issue. However, maybe I'm not following the manual correctly. Attached are the pages I'm going by. Thank you!

[dick_barton]

Re: Sharp LC-60EQ10U - powers on but no glow

Page 6-3 appears to indicate 3 slow, 1 fast pulse as a communication problem. Have you tried a firmware update.

http://www.sharpusa.com/Support/Prod...del=LC-60EQ10U

[budm]

Re: Sharp LC-60EQ10U - powers on but no glow

I misspoke about the glow of the panel. The panel DOES glow (with TCON ribbons disconnected) but I can't see anything with the flashlight trick. No sound. Thanks for the service manual link.

Here are the L1 readings:
(L1-15) LED4-: 10.5V
(L1-13) LED4+: 83.5V
(L1-11) LED3-: 10.5V
(L1-9) LED3+: 85V
(L1-7) LED2-: 10.5V
(L1-5) LED2+: 85V
(L1-3) LED1-: 10V
(L1-1) LED1+: 85V


Yes, at PD pins 1 and 2 (PNL12V) I am getting 12V.

When I reconnect everything and turn it on, the front panel LED remains lit for maybe a minute, then it starts throwing a flash code. It looks like 3 "normal(?)" flashes, then 1 quick flash, then repeat. Based on the service manual, it looks like a P board issue. However, maybe I'm not following the manual correctly. Attached are the pages I'm going by. Thank you!

Do you have the rest of the service manual? May be you should upload it.

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

Page 6-3 appears to indicate 3 slow, 1 fast pulse as a communication problem. Have you tried a firmware update.

http://www.sharpusa.com/Support/Prod...del=LC-60EQ10U

Thanks, dick. It appears you must use the OSD to upgrade the firmware. I have no picture, though. Page 4-32 of the operation manual (attached).

Do you have the rest of the service manual? May be you should upload it.

Attached now, bud.

[budm]

Re: Sharp LC-60EQ10U - powers on but no glow

OK, so the DCV at the LED 1+~LED4+ are 85VDC. Is that reference to the chassis GND?
So at this point just to be sure; you do have backlights but no images on the screen, correct?

[dick_barton]

Re: Sharp LC-60EQ10U - powers on but no glow

It appears you must use the OSD to upgrade the firmware. I have no picture, though. Page 4-32 of the operation manual (attached).

Download the firmware and extract to an empty USB stick. Plug it into the usb socket as shown on page 4 - 33 and follow the instructions.

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

OK, so the DCV at the LED 1+~LED4+ are 85VDC. Is that reference to the chassis GND?
So at this point just to be sure; you do have backlights but no images on the screen, correct?

Yes, chassis ground. The same one the board is grounded to. I do have backlights when the TCON ribbon cables are removed. No backlights when the TCON is connected. No image on screen.

Download the firmware and extract to an empty USB stick. Plug it into the usb socket as shown on page 4 - 33 and follow the instructions.

I understand, but I can't use the on screen menu because I can't see it.

[budm]

Re: Sharp LC-60EQ10U - powers on but no glow

Yes, chassis ground. The same one the board is grounded to. I do have backlights when the TCON ribbon cables are removed. No backlights when the TCON is connected. No image on screen.



I understand, but I can't use the on screen menu because I can't see it.

So do you have to remove all 4 cables from the T-CON to the LCD panel to make the backlights come on or it only takes to remove just one of the Four to make the backlights come on?
It sounds like you may have problem in the panel.

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

So do you have to remove all 4 cables from the T-CON to the LCD panel to make the backlights come on or it only takes to remove just one of the Four to make the backlights come on?
It sounds like you may have problem in the panel.

Good call, bud. With SC5302 disconnected, I get half snow and half vertical lines. Pics attached. Bad T-CON?
With any of the 4 other cables disconnected, I get no backlight.

EDIT: While looking for a TCON board replacement, I've noticed the board in the set now is a G400FM07. The parts list in the service manual says the TCON should be a G400FM01 for the LC-60EQ10U. This set was given to a guy that brought it to me. I wonder if they tried their own repairs and used the wrong board? The G400FM07 isn't even in the service manual. ShopJimmy says the G400FM07 is for an LC-60SQ15U. Not really sure if it matters?

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

So, replaced the TCON with a "good" board from eBay (they claimed it was tested; only place I could find one). The same problem persists. Disconnecting one ribbon cable from the TCON gives me half snow/half vertical lines.
Any other suggestions?

[budwich]

Re: Sharp LC-60EQ10U - powers on but no glow

leave the tcon cables connected. Look towards the bottom corner of the tv on each side. There is flex cables that connect the bottom edge boards to the drivers on each side of the panel. At the "cable clamp" there in, disconnect the flex cable (similar to what you did on the tcon) carefully. then tried powering up. Do the same test on the other side (only have one side at a time disconnected). If you get lucky, you can go from there.

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

leave the tcon cables connected. Look towards the bottom corner of the tv on each side. There is flex cables that connect the bottom edge boards to the drivers on each side of the panel. At the "cable clamp" there in, disconnect the flex cable (similar to what you did on the tcon) carefully. then tried powering up. Do the same test on the other side (only have one side at a time disconnected). If you get lucky, you can go from there.

Messing with those flex cables causes half the screen to go black or white, while the other side remains "snow." Bad panel?

[andytv]

Re: Sharp LC-60EQ10U - powers on but no glow

Hi Joeblah, did you ever find a solution to your problem. I also have the same model iwith exactly the same symptoms. Thanks, Andy.

[budwich]

Re: Sharp LC-60EQ10U - powers on but no glow

are you feeding into any of the inputs? your "messing with those cable..." doesn't really provide much good information. Describe exactly which cable results in what screen display. Post a picture. It is unlikely that "snow" is a panel issue.... but it depends on the "storm"... :-) It sounds like you are on the "antenna" input of the atsc tuner with nothing connected.

[joeblah]

Re: Sharp LC-60EQ10U - powers on but no glow

andytv, I gave up after replacing the TCON and the MAIN boards.

budwich, there is a picture above. the "snow" is the antenna input. I'm fine with snow, it's the colored vertical lines that I don't want.

[andytv]

Re: Sharp LC-60EQ10U - powers on but no glow

andytv, I gave up after replacing the TCON and the MAIN boards.

budwich, there is a picture above. the "snow" is the antenna input. I'm fine with snow, it's the colored vertical lines that I don't want.

Thanks, the LED sequence flashing in my case, 3-1, points to the main board according to the SM. I ordered one. Will cost 100$ to find out !! . I'll keep you posted.
The problem with EBay, often those supposedly good board are not. They've been sold and returned many times.