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 !

Monday, 4 May 2020

ELENBERG LT-72602E POWER BOARD SCHEMATIC DIAGRAM / ELENBERG 1402 - 2108 - 21F08 - 29F08 - ELENBERG - 21SL39 CAMERON FULL SCHEMATIC DIAGRAM, FACTORY MENU (SERVICE MODE MENU)

 

 Elenberg LT-72602E Power board schematic





Elenberg 1402/2108/21F08/29F08 (Elenberg) 21SL39 (CAMERON) CRT TVs - full schematic, Factory menu (Service Menu)

Factory menu
Some adjustments must be performed in the Factory menu. You can enter the Factory menu in the following way:
1.
Press the MENU button on the remote control then press the Q.VIEW button on the remote control at least 5 times immediately.
2. Press the MENU buttons to select the desired Factory menu pages or press 0-9 number buttons to enter the Factory menu pages directly and then press the PROG.+/- buttons to select the desired items.
3. Press the VOL+/- buttons to change the settings.
B+ Adjustment
Test Equipment: Multifunction meter
1. Operate the TV set with AC 110-240V(50/60Hz).
2. Receive Television broadcast signal, set PICTURE to Normal mode.
2. Connect the multifunction meter + lead to C960 and GND. Adjust the RP950 until the meter reading the proper DC value (model 1402/2108/21F08: B+=107±0.5Vdc; model 21SL39: B+=115±0.5Vdc; model 29F08: B+=135±0.5Vdc)

High voltage check and filament voltage check
Test Equipment: High voltmeter
1. Make sure AC power supply and +B are within pointed range before calibrating high voltage.
2. Connect high voltmeter to anode (G4) of CRT.
3. Turn on the TV, set the BRIGHTNESS and CONTRAST to the minimum (zero beam current), swap to AV mode (No any signal applied).
4. High voltage please see the related model BOM.
5. Filament voltage measured by virtual value meter please see the related model BOM, usually within the range of 6.3±0.2Vrms.
Grid voltage adjustment

Enter into FAC3 and select VG2, then adjust potentiometer to IN/OUT flash on the screen.

Receive PHILIPS five circles pattern after settings finishing, set PICTURE to Normal mode.

RF AGC adjustment
1. Receive a 60dBμ V gray scale signal(PAL or SECAM).
2. Enter Factory menu and select AGC TAKE OVER, then adjust it until the picture noise is just disappeared.

FOCUS adjustment
1. Receive five circles pattern, adjust the pattern to Normal mode.
2. Adjust focus potentiometer (horizontal output transformer) so that the center and four corners of pattern are the best focus.

Horizontal scanning, vertical scanning and geometry correction adjustment (adjust with PAL/SECAM and NTSC signal separately)

Receive five circles pattern signal, enter into factory menu to call up FAC2.

VERT SLOPE 50(60)  XX Adjust it so that horizontal midline of the pattern superpose with the black edge of the pattern.

VERT SHIFT 50(60)  XX Adjust it so that the pattern midline superposes over CRT geometric center.

VERT AMPLE 50(60)  XX Adjust it so that the picture vertical reproduction display ratio is more than 92%.

S CORR 50(60)  XX Adjust it so that upper pane and bottom pan of the pattern are the same as the middle pane.

V.LIN.CTRL 50(60) = 0

V LINEARITY 50 60XX Adjust vertical linear

VERT ZOOM 50(60)  25 Adjust vertical amplitude fixed value 25

2. Call up FAC1

EW WIDTH 50 60XX Adjust it so that the picture horizontal reproduction display ratio is more than 92% (H- size adjustment).

HOR.SHIFT 50 60  XX Adjust it so that the left half is symmetrical with the right half (H. CEN correction).

EW PARABOLA 50 60  XX Adjust it so that parallelogram will be transformed to rectangle or trapezium (Receive cross hatch signal)(Parallelogram correction).

TRAPEZIUM 50 60  XX Adjust it so that trapezium distortion is just disappeared (Receive cross hatch signal)(Trapezium).

UC PARABOLA 50 60  XX Adjust it so that upper corner (left and right) vertical line are straight line (Receive cross hatch signal)(Upper corner pincushion).

LC PARABOLA 50 60XX Adjust it so that bottom corner (left and right) vertical line are straight line (Receive cross hatch signal)(Bottom correction pincushion)

HOR.BOW 50 60 XX Adjust it so that vertical line is the straight line.(Receive cross hatch signal) (Bow correction).

PARALLEL 50 60  XX Adjust it so that left and right line are straight lines (Pincushion correction).

White balance adjustment (PAL or SECAM signal)
1. Enter into menu firstly and set COLOR mode to normal.(9300K)
2. Enter into AV mode and receive left black right white signal which with color sync signal.
3. Plug XS805, adjust it automatically with white balance adjustment software, enter into factory menu when adjustment is OK, then enter into FAC 6
FAC 7, FAC 8 menu to check the following data are consistent with data in computer.

Standard Color temperature 9300K X=0.284 Y=0.299 FAC 6

Cold color Color temperature 12000K X=0.272 Y=0.279 FAC 8

Warm color Color temperature 6500K X=0.313 Y=0.329 FAC 7

SCHEMATIC DIAGRAM