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Search: Posts Made By: Pierre95
Forum: Troubleshooting TVs and Video Sources 11-21-2019, 09:01 AM
Replies: 3
Views: 233
Posted By Pierre95
Re: Connecting an external display to oceanic le-32z4 mainboard

Thanks for the provided links.

The one from aliexpress may work, HDMI being labelled as output and LVDS as input. Less sure about the other from Amazon as the configuration is more typical of the...
Forum: Troubleshooting TVs and Video Sources 11-05-2019, 03:59 AM
Replies: 3
Views: 233
Posted By Pierre95
Connecting an external display to oceanic le-32z4 mainboard

Hello,

This is more a "hack" related question than a troobleshooting thread:

I have a TV with dead display but the mainboard which delivers LVDS signals still functionnal.

I would like to...
Forum: Troubleshooting TVs and Video Sources 08-20-2019, 06:23 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Resistance between HVIN_12V and VIN_12V is arround 74K in one direction of measurement and 60K in the other direction but the value increases slowly as if some capacitor were involved.
Forum: Troubleshooting TVs and Video Sources 08-18-2019, 05:14 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Please find attached the sequence of pictures for the whole TCON.
Forum: Troubleshooting TVs and Video Sources 08-18-2019, 07:33 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Thanks for clarification! And I guess VIN_12V gets switched by RT6905 through GD? Is the switching operation initiated through an I2C command sent over the SDA SCL lines or does it start...
Forum: Troubleshooting TVs and Video Sources 08-16-2019, 07:55 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Please find attached connexion routing for HVIN_12V.

As I understand from your schematics, HVIN_12V is issued via pin 46 (LX1) and fed through L104 to generate actual HVIN_12V.

As per my...
Forum: Troubleshooting TVs and Video Sources 08-14-2019, 03:46 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

You may have posted #24 while I was editing post #25. I will have detailed reading of the attached documents you provide, and recheck VIN_12V's fuse and see how it connects to HVIN_12V.
Forum: Troubleshooting TVs and Video Sources 08-14-2019, 01:57 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

That could be caused by the caps themselves or internal RT6917GQW failure.
Forum: Troubleshooting TVs and Video Sources 08-14-2019, 01:34 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

There are 4 caps between AVDD and GND. Is that one or several caps are partial shorts creating the 74 ohms resistance or is this value typically of the AVDD output?

Interesting reading...
Forum: Troubleshooting TVs and Video Sources 08-14-2019, 03:59 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

I don't have VDD, VGH, VGL or maybe they use different naming. What do VDD, VGH, VGL stand for? Maybe I can find some equivalency with different naming.

I have VON, L_L, L_H but they are close to...
Forum: Troubleshooting TVs and Video Sources 08-13-2019, 06:59 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

As you suggested budm, I took several measurements on the TCON when TV is ON. I read:

HVIN_12V: 0,17V
AVDD: 0V
VCC_1.8V=0V
VCC_1.15V=0V
VCC_3.3V=0V

Only VIN_12V (provided from the...
Forum: Troubleshooting TVs and Video Sources 08-08-2019, 12:03 PM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Yes backlight is ON and yes I've got to the T-CON board which has an unusually wide shape (see picture).
Forum: Troubleshooting TVs and Video Sources 08-08-2019, 08:38 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

I took measurements directly on the TCON and for each pair, signals are as shown on the attached pictures which are for the TX_1_0_N/TX_1_0_P pair but other pairs show similar signals, except for the...
Forum: Troubleshooting TVs and Video Sources 08-06-2019, 10:15 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

Here are the measurements of voltages on the 2*6pins PSU connector:

TV in standby mode (red LED):

12,11V- -12,11V
5,42V- -12,11V
0V - -GND
0V- -GND
2,24V- -GND
...
Forum: Troubleshooting TVs and Video Sources 08-02-2019, 11:09 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

I also noted there is no change in picture apparence when the main PCB is disconnected from the TCON which most likely means the mainboard doesn't produce any video signal at all.
Forum: Troubleshooting TVs and Video Sources 08-02-2019, 07:20 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Re: Toshiba 40L3433DG backlight OK but no picture

OK, I will do that and let you know. Should I also test 17MB95's locally generated voltage from U19 (TPS65251)??
Forum: Troubleshooting TVs and Video Sources 08-02-2019, 06:03 AM
Replies: 33
Views: 1,738
Posted By Pierre95
Toshiba 40L3433DG backlight OK but no picture

Hello,

I got a faulty Toshiba 40L3433DG TV. When turned ON, no logo is displayed. There is no way to enter any setup menu. A permanent dark picture is displayed as if no signal was even found.
...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 06-19-2019, 05:38 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

After some theoretical reading about brushless sensorless motors, I realized the measurements of the M1A, M2A and M3A signals were not valid as they were referenced towards the regular D GND ground...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-30-2019, 02:23 PM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

I made recordings of the M1A, M2A and M3A and /CYL ON signals. When the tape ejection mechanism is opened/closed, we can see /CYL ON going low for 2 seconds then high again. Within the 2 second /CYL...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-21-2019, 05:09 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

I tried the flet pen mark test. The video heads drum changed its position but maybe it was due to the tape being pushed against the video drum while the cassette was getting to its position within...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-20-2019, 05:18 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

That's a good point you had the opportunity to work on several brands/models of camcorders. About me, it's the first time I have to service a camcorder and I have to say the level of integration and...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-18-2019, 09:29 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

Ok I will try the flet pen mark test. About the flex cable, I already checked the wiring between the motor and the IC through that cable.

What about the COM CYL signal? Is it through it that the...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-18-2019, 06:50 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

As error F05 refers to "Cylinder Lock", I concentrated on checking continuity of the 7 wires between connector FP2202 and corresponding pins on IC2201. I checked directly on where the signals end, on...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-17-2019, 06:08 PM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

I did not have time to check for broken soldering joints yet, but I've got the idea to trigger displaying the error code behind the "Please re-operate after pushing reset button" message by pressing...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 05-16-2019, 05:59 AM
Replies: 35
Views: 2,717
Posted By Pierre95
Re: Panasonic NVGS50 camcorder backlight issue

I will inspect soldering joints near the plugs involved in the tape mechanism.

As the behavior is not the same when a tape is inserted, the tape detection seems to work properly. There may be...
Showing results 1 to 25 of 56

 
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