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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 27 February 2019

HOW TO ENTER SERVICE MODE TO LG DIGITAL BUS CHASIS FITTED CRT TVs [COMMON MODEL]

HOW TO ENTER SERVICE MODE TO LG DIGITAL BUS CHASIS FITTED TVs [COMMON MODEL]


USED ICs

5W7 3CD0 => MAIN SYSTEM CONTROL.
LC 75342 => SOUND PROCESSOR.
LA 76810B => VIDEO CHROMA JUNGLE.
LA 7840 => VERTICAL OUTPUT.
7805BT => 5V REGULATOR.
LA 4277 => AUDIO OUTPUT.
HTS-2103S => LINE OUTPUT TRANSOFRMER
24C16 => MAIN SYSTEM MEMORY.
TRANSISTORS IN POWER SUPPLY REGULATOR.
To enter into service mode:
* Press Vol (-) button till volume to (00) [Minimum].
* Press "REP" on the remote control once and loosen it.
* Keep pressing Vol+/Vol(-)  on the TV unit, and press "REP" on the remote control.  The screen will display Factory Status.
* To exit from service mode:
When preset the "Set-Up" status using the above method, repeat the above three to exit.
* To call an item to adjust, press Ch+ & Ch(-) buttons on the remote control.
* To adjust the data value to selected item, use Vol+ & Vol (-) button on the remote control.
BLACK & WHITE BALANCE DATA CHART.

OSD
DATA
OSD
DATA
S-BRI
70
R-DRV
60
C,B/W
0
B-BIA
13
B-DRV
60
G-BIA
102
G-DRV
8
R-BIA
16






PRESET STAUS

ITEM
OSD
FULL NAME
DATA
00
H-PHASE
HORIZONTAL PHASE
10
01
NT.H PHASE
HORIZONTAL PHASE FOR NTSC STANDARD
13
02
H.BLK-LEFT
HORIZONTAL BLANKING - LEFT
4
03
V.BLAK-RIGHT
HORIZONTAL BLANKING - RIGHT
5
04
V-SIZE
VERTICAL SIZE
83
05
V-LIN
VERTICAL LENEARITY
10
06
V-POSI
VERTICAL POSITION
0
07
V-SC
VERTICAL S-CORRECTION
5
08
NT-V-SIZE
VERTICAL SIZE FOR NTSC STANDARD
10
09
NT-V-LINE
VERTICAL LINEARITY FOR NTSC STANDARD
10
10
NT-V-POS
VERTICAL POSITON FOR NTSC STANDARD
6
11
NT-V-SC
VERTICAL S-CORRECTION FOR NTSC STANDARD
 5
12
RF-AGC
AGC ADJUSTMENT FOR RF
36
13
VOL-OUT
VOLUME OUTPUT
110
14
SUB-CONT
SUB CONTRAST ADJUSTMENT
31
15
SUB-COL
SUB-COLOR ADJUSTMENT
32
16
S-SHARP
SUB-SHARPNESS ADJUSTMENT
0
17
SUB-TINT
CUB-TINT ADJUSTMENT
32
18
OSD-CONT
ON-SCREEN DISPLAY CONTRAST
70
19
OSD-H-POS
OSD HORIZONTAL POSITION
20
20
OSD-V-POS
OSD VERTICAL POSITION
20
Posted By: FRANK at 01:24
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