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 !

Thursday, 14 May 2020

LG-CB20T20X AND LG WP32A30 – SERVICE MODE OPTIONS ADJUSTMENT AND SCHEMATICS DIAGRAMS

LG-CB20T20X with TDA8841 OR TDA8842 AND LG WP32A30 with  CXA1855S, CXA2050S – SERVICE MODE, OPTIONS ADJUSTMENT AND SCHEMATICS DIAGRAMS

To read a Lg Tv Schematic Wiring Diagram, you should know different symbols used, such as the main symbols, lines, and the various connections. The standard or fundamental elements used in a wiring diagram include power supply, ground, wire and connection, switches, output devices, logic gate, resistors, light, etc.

A Lg Tv Schematic Wiring Diagram usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device. This is unlike a schematic diagram, where the arrangement of the components interconnections on the diagram usually does not correspond to the components physical locations in the finished device. A pictorial would show more detail of the physical appearance, whereas a wiring diagram uses a more symbolic notation to emphasize interconnections over physical appearance.


Lg Tv Schematic Wiring Diagram is the least efficient diagram among the electrical wiring diagram. They are often photos attached with highly-detailed drawings or labels of the physical components. A pictorial doesn’t even make an effort to be shown clearly or effectively. A person with a strong knowledge of electrical wiring diagrams can only understand a pictorial.

RF AGC (Automatic Gain Control) Adjustment,  Test Point - AGC TP (J05).  Adjust - Remote Control

The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions.  Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as;

1) Channel interference in a CATV system.
2) Picture bending and/or color beats, which are unusually due to excessive RF signal input when the receiver is too close to a transmitting tower or when the receiver is connected to an antenna distribution system where the RF signal has been amplified. In this case, the input signal should be attenuated (with pad or filter) to a satisfactory level.
3) Picture noise caused by "broadcast noise" or weak signal.  If the broadcast is "clean" and the RF signal is at least 1mV (60dBu), the picture will be noise free in any area.

Adjusting RF AGC to one end of rotation will usually cause a relatively poor signal to noise ratio;
Adjusting to the other end of rotation will usually cause a degradation of over load capabilities resulting in color beats or adjacent channel interference.

Adjustment

1. Connect RF signal (65dB!0.2dB) and turn on the TV. [ Standard adjustment Channel]
- EU 05 Ch. (frf = 175.25MHz) : CK, CL, CB
- EU 41 Ch. (frf = 631.25MHz) : CI
2. Press OK buttons on TV set and Remote Controller at the same time to get into SVC-0 mode.
3. Press Channel UP/DOWN button on the Remote Controller several times to find AGC?
4. Press Volume UP/DOWN button until the AGC Voltage is the same as the Table below.
5. Press OK button to memorize the data.

Service mode

To enter SVC mode, press "OK" buttons on both TV set and the Remote control at the same time.

Preparation for Deflection Adjustment
1) At SVC mode, press the Yellow colored button.  If the Remote Controller doesn't have the Yellow button, you should use a Service Remote Control (105-201G) and press SVC button.
And then, deflection data adjustment OSD (SVC1 mode) will be displayed.
2) Press Channel UP/DOWN button for desirous function
Adjustment.
3) Press Volume UP/DOWN button to adjust the data.

Vertical Adjustment
Select VS and adjust until the mechanical centre of CPT and that of screen coincides and select VA and adjust to coincide the inner circle of screen with outer frame of CPT.

2) Horizontal Adjustment
Select HS and adjust until the mechanical centre of CPT and that of screen coincides.

3) Vertical S Correction Adjustment
Select SC and adjust until top-bottom side pincushion are equal.

4) Press OK button to memorize the data.



White Balance Adjustment.(LINE SVC-0)

[This adjustment should be performed after screen voltage adjustment.]

Tune the TV set to receive an 100% white pattern.
2) Press OK(Y) buttons on TV set and remote controller at the same time to get into SVC mode.
3) Press PSM(RED) button on remote controller. (Standard picture)
4) Press Channel UP/DOWN button for desirous function adjustment.
5) Adjust VOL+ or VOL- button for GG031.
6) Adjust VOL+ or VOL-button in each status of "Rg--" "Bg--" for
X=293!8, Y=295!8 with color analyzer.
7) Press OK button to memorize the adjustment data.


OPTION Adjustment (SVC MODE: OPTION-1, OPTION-2)

[When the EEPROM has been replaced, the Option data should be restored as the function of individual system and specification.]

Press OK buttons on both TV set and Remote Controller at the same time to get into SVC mode.
2) Press the Yellow button several times to find OPTION-1 or OPTION-2.
3) Input the correspond OPTION data referring to Table below with the numeric buttons 0~9.



LG-CB20T20X schematic

LG WP32A30 SCHEMATIC