Sharp LC-55CFE6242E TV Issue: No Picture After Logo, Voltage Disappearance & Solution Options

Hello.
Sharp logo is shown when turned on, image fades out after a second. Voltage measurements on the t-tone at the time of switching on as described on the board, but after a while the AVDD voltage from the RT6929 system and VOFFE from the RT6930 system disappears. The remaining tensions remain normal all the time. What could be the cause of such a malfunction? T-con plate integrated with the LSC550HN02 matrix, so swapping is not an option. Maybe someone has datasheets for these scalers? Capacitors checked.
Please, suggestions.
Main board: T.MS6308.711
Matrix: LSC550HN02
Greetings.

Do you have phonia, it responds normally to the remote control?

I tried to update with the software downloaded from Sharp, according to the instructions. The effect is that the LED has been blinking for several hours and nothing happens. No audio, no longer responding to the pilot. I didn't check the audio before the update, but it could be turned on and off from the remote control.

There are no datasheets available for these chips, so it's hard to say how they work with each other and the Controller on the T-con board. One is the QFN48 case / the other is QFN40

From experience (with the described symptoms)> low voltages are present: 3.3 /1.8/1.2/12V
- not with RT6930 -7.6 V / 11V
- not with RT6929 17V and VGH / VGL / ...
as I wrote in Link

wine in:
1.LVDS controler (?) 60%
2. matrix


ps
LTF6280 (15Y_S40FF11MB7S4LV0.3 for matrix - LSY400HN01) Sony KDL-40RD453

Next week I will have my main board replaced. We will see if there will be changes.

I replaced the main board, the symptoms remained the same. The diagnosis of my colleague Lisk is probably confirmed. Colleagues, does anyone repair such T-cones?

Hello. I have the same t-con module in Sony. Identical symptoms, logo and black screen after a second.
After disconnecting the connectors from the matrix, all voltages are correct. Second t-con module substituted and the same. Without the matrix, all the tensions are present, after soldering even one side, there is a half screen, half a logo and a black screen after a second.
So what, it is known that the fault of the matrix.
The matrix is complete, not damaged. The logo is perfect for a second.
Anyone know what can cause this behavior of the matrix? Maybe she needs to be warmed up somehow ...

I would like to add, gentlemen, do not be afraid of this t-con connector with the matrix. Homemade method, clean it well, liquid flux and normally it can be soldered.
I have moved twice and everything works.

hello, it is 100% glass fault but I repaired two sons with kdl48w705

Hello guys!
Sorry that I cannot speak polish.I got a sony kdl 48r555c with tcon board somehow the same,same ic´s rt6929 rt6930.Starting,sony logo comes and in a few seconds fade out.All voltages ok for few seconds,3.3,1.2,avdd,havdd,etc. then 0.Still backlight but no picture.After digging everywhere I cannot find a datasheet for rt6929.It seems that protection kicks in and stops all voltages.I resolved the issue by cutting MON_L , after trying with MON_R and no succes(I cutted first MON_R with no succes wich remained unsoldered! and then cutted also MON_L and voila!!!boom!!!) .Found a refference on youtube but I have no right to post the link.Hope that it will help someone.(Image is cortesy of those guys!)

As for the model (kdl-48r555c) look at the page
Link
matrix eq. LSY480HN02-A01 or ?

Quote:

you have option Download the GN1S CHASSIS document in the archive (8.9 MB) *.zip

Service Manual 126 pages /2015 г.

Quote:

KDL-32R500C, KDL-32R507C, KDL-40R510C, KDL-40R550C, KDL-40R555C, KDL-40R557C, KDL-48R510C, KDL-48R550C, KDL-48R555C, KDL-48R557C.

Main look Link

Quote:

KDL-48R555C
Board Number/ pcb: 1-894-094-22|173534122|A2066951B|A2066951C| A2066951D| A2066951A
Manufacturer Part Number 1:Sony A-2066-952-B

p.s
RT6929- 1.2 V, 1.8 V, 3, 3V, 8.5 V, 17V
RT6930- Vone

Either damaged Matrix glass or ceramic capacitors on Matrix ears

Sometimes it helped.

Thank you very much!

Exactly mentioned problem with SHARP LC-55CFE6242E. The 17V and 8.5V voltages were lost immediately after switching on.
Capacity OK. So I aborted MON_R. A vualaaa.