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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Tuesday 5 February 2019

JVC AV-28T5BK - CTV HOW TO ENTER SERVICE MODE – MEMORY IC REPLACEMENT – INITIAL DATA VALUES IN SERVICE MODE

JVC AV-28T5BK - CTV How to enter service mode – Memory IC replacement – Initial data values in service mode

Adjustments after the replacement of memory IC, Service mode entry and data adjustment procedure, Initial data setting values in service mode, Service menu flow chart. JVC AV-28T5BK/P, AV-28T5BR/P, AV-28T5SK/P, AV-28T5SR/P, AV-28T5SP/P 
There are 2 ways of adjusting this TV: one is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.  The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
MEMORY IC REPLACEMENT
• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting values.
3. Power on
Connect the power plug to the AC outlet and switch on the power.
4. System constant check and setting
* It must not adjust without signal.
(1) Press the [INFORMATION] key and the [MUTING] key of the REMOTE CONTROL UNIT simultaneously.
(2) The SERVICE MODE screen will be displayed.
(3) While the SERVICE MODE is displayed, press the [INFORMATION] key and [MUTING] key simultaneously, and the SYSTEM CONSTANT SET screen 2 will be displayed.
(4) Refer to the "SYSTEM CONSTANT SETTING", and check the setting items. Where these differ, select the address with the [FUNCTION /] key and adjust it with
the [FUNCTION Up/Dn] keys. (The letter of the selected item is displayed in yellow.)
(5) Setup will become effective if the main power is shut off.
5. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
6. User settings
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING INSTRUCTIONS and set the items as described.
7. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary.
MEMORIZE THE ADJUSTMENT DATA
When adjustment is completed, press the [MENU] key to memorize the adjustment value. If not to do it, adjustment data is not memorized to the memory IC. And if exit the adjustment mode before memorize the data, the adjustment value which you change is canceled.
RELEASE [Exit] OF SERVICE MODE
After completing the setting, return to the SERVICE MODE, then again press the [INFORMATION] key.
Service menu flow chart
INITIAL SETTING VALUE OF SERVICE MODE
(1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values. However, the new setting values which displays on the screen in its optimum condition may differ from the initial setting value.
(2) Do not change the initial setting values of the items not listed in “ADJUSTMENT PROCEDURE”.
(3) “---” is impossible to adjust or not requirement to adjustment.
Click on the pictures to zoom in
Posted By: FRANK at 05:47
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