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 !

Monday, 4 February 2019

TCL 2170SG – TCL1427 CTV – HOW TO ENTER SERVICE MODE – CIRCUIT DIAGRAM

TCL 2170SG – TCL1427 CTV – How to enter service mode – circuit diagram

Used ICs: TC4066BP – TC4053BP – TMPA8803CSN – 24C08 - STV9302 – MSP34X5G – MC44608 – TDA7057AQ
Initialization
Press sound-effect under factory mode, the set will initialize, until “OK” appears on the screen which means the initialization is finished. After initialization, the set will quit factory mode automatically.
Factory settings
D-mode(Design mode)
Enter D-Mode by pressing D-Mode ON/OFF key, and then you can enter the D-mode.
S-mode (Service mode)
Enter S-Mode by pressing VOLUME DOWN key on the unit until the volume decrease to minimum level, then press the DISPLAY key on the remote handset (don’t release the volume key) and you can enter S- mode.
After enter D-mode or S-mode, press OK, then press program up/down to select menu from menu 1 to menu 22, press OK to enter the menu, press program up/down to select item, press volume up/down to adjust the setting. Press D-mode again to quit factory mode.
You can also enter menu 1 to menu 19 directly by pressing digital button 1~9, 0, notebook, CAP, Display, Sleep, Calendar, System/INS, Favorite, Return, Picture.
Circuit diagram [Click on the circuit diagram to magnify]
Adjustment of B+ voltage
1) Apply 120VAC(±5V) to mains power input, and Philips standard testing pattern to RF input.
2) Adjust VR830 in STANDARD mode until voltage at TP2 (B+) is 108V ±0.5V
Screen & Focus voltage adjustment1. Apply pattern signal in normal status, enter D-mode, press “TV/AV” button to turn off the vertical output.2. Adjust the SCRREEN switch on the flyback transformer to make a horizontal shining line just visible on the screen.3. Turn on the vertical output, adjust the “FOCUS” on the flyback transformer to obtain the optimum focus.
Adjustment of Sub-brightness,1. Apply the Grey-scale/Color bar (NTSC signal) to the AV input, in normal status.2. Select BRTC to adjust the sub-brightness, until that the 2nd dark bar of 8 level Grey scale just can be seen.
Posted By: FRANK at 02:53
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