REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 19 February 2019

LG 47LG90 T-CON CONTROLLER BOARD - VOLTAGE CHART

LG 47LG90 T-CON CONTROLLER BOARD - VOLTAGE CHART

The T-Con IC UC2 receives from main board at CV-1 & CN-2 quadaple 12 bit LVDS signals which it processes into TFT drive signals through connectors.  CN-4 and CN-5 controls the LCD panel.  ICs U-12 & U-13 are dynamic RAM ICs, which are hi-speed storage devices.  12V is supplied to T-Con board on connector CN-1 In this set, T-Con also drives the back light LEDs in accordance to necessary light source intensity according to the video contents.  Control signals to the inverter are sent out CN-8&CN9.
                                                    T-Con board Out of the Shield. CN-304 INVERTR 'M' TO CN-8 T-CON

Pin
Label
Stby
Run
Diode check
Pin
1,2,3
Gnd
Gnd
Gnd
gnd
14,15,16
4
EXT VBRB
UV
1.3V
OPEN
13
5
GND
GND
GND
GND
12
6
AFLC_SPI_EN
0
0.1
1.0
11
7
AFLC_DET
0
0
1.1V
10
8
VBR_LAT
0
0
OPEN
9
9
VBR_SIN
0
0
OPEN
8
10
VBR-SCLK
0
0
OPEN
7
11
DRV_XLATO
0
0
1.0V
6
12
N/C
N/C
N/C
OPEN
5
13
DRV_SIND
0
1V
1.0V
4
14
DRV_SCLK0
0
1V
1.0V
3
15
DRV_BLK0
0
0
0.9V
2
16
DRV_GSCLK0
0
1.7V
0.9V
1






CN804 INVERTER 'S' TO CN9 T-CON

PIN
LABEL
STBY
RUN
DIODE CHECK
PIN
14,15,16
GND
GND
GND
GND
1,2,3
13
N/C
N/C
N/C
OPEN
4
12
N/C
N/C
GND
GND
5
11
AFLC_SPI_EN
0
0.13V
1V
6
10
AFLC_DET
0
0
1.1V
7
9
VBR_LAT
0
0
OPEN
8
8
VBR_SIN
0
0
OPEN
9
7
VBR_SCLK
0
0
OPEN
10
6
DRV_XLATO
0
0
1V
13
5
N/C
N/C
N/C
OPEN
12
4
DRV_SIN0
0
1V
1V
13
3
DRV_SCLK0
0
1V
1V
14
2
DRV_BLK0
0
0
0.9V
15
1
DRV_GSCLK0
0
1.7V
0.9V
16






T-CON TFT DRIVE PWB DC TO DC CONVERTER CHECK
Cathode voltage of D12 > 3.4V Cathode voltage of D13 > 16.1V Cathode voltage of D17 > 3.5V

Posted By: FRANK at 05:56
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