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 !

Saturday 9 February 2019

JVC AV27D302 _ JVC AV27D202 _ SERVICE MODE _ SELF CHECK FUNCTION _MEMORY IC REPLACEMENT _ BLINKING CODES

JVC AV27D302 _ JVC AV27D202 _ SERVICE MODE _ SELF CHECK FUNCTION _MEMORY IC REPLACEMENT _ BLINKING CODES





TO ENTER SERVICE MENU

  • Press SLEEP TIMER key and, while the indication of “SLEEP TIMER 0 MIN.” is being displayed, press DISPLAY key and VIDEO STATUS key on the remote control unit simultaneously to enter the SERVICE MENU screen.

SERVICE MENU screen selection
  • Press the UP / DOWN key to select any of the following items.
TO ENTER ANY ADJUSTMENT MODE [PICTURE AND SOUND MODE]
  1. If select any of PICTURE or SOUND items, and the LEFT / RIGHT key is pressed from SERVICE MENU ( MAIN MENU ), the screen will be displayed.
  2. Then the UP / DOWN key is pressed, the PICTURE mode screen or the SOUND mode screen is displayed, and the PICTURE or SOUND setting can be performed.
THEATER, LOW LIGHT AND RF AFC CHECK MODE
  1. If select any of THEATER / LOW LIGHT / HIGH LIGHT / RF AFC CHK items, and the LEFT / RIGHT( ) key is pressed from SERVICE MENU ( MAIN MENU ), the screens will be displayed.
  2. Then the settings or verifications can be performed.
TO EXIT SERVICE MODE

After returning to the SERVICE MENU upon completion of the setting (adjustment) work, press the EXIT key again.

SELF CHECK FUNCTIONS

This model has self check functions given below. When a malfunction has been detected, the POWER is turned off and the LED flashes to inform of the failure . The malfunction is detected by the signal input state of the control line connected to the microcomputer.

SELF CHECK ITEMS

  • CRT NECK PROTECTOR:  Also detected if the power supply line output from the HVT (High voltage Transformer) has shorted with the ground.
  • DETAILS OF DETECTION:  When the vertical circuit S correction capacitor C427 is shorted, detect the potential drop of the C427, and prevent the burn damage to the CRT NECK.  (Grounding of shorting of the power supply output from the HVT to the vertical circuit, and the small signal power supply is also detected.)
  • METHOD OF DETECTION:  The microcomputer detects at 1 second intervals.  If NG is detected for more than 1 ms, a malfunction is interpreted.
  • STATE OF MALFUNCTION:  When a malfunction has been detected, the POWER is turned off. While the POWER is being turned off , the power key of the remote controller is not operational until the power code is taken out and put in again.
SELF CHECK INDICATION FUNCTION

The self-check function begins detection about 5 seconds after power is supplied.  In the event a malfunction is detected, the power is cut off immediately.
At this time, the ON-TIMER LED flashes to inform of the malfunction.

MEMORY IC REPLACEMENT

After replacing the memory IC, system constant check and setting should be done.
  • Press SLEEP TIMER key and, while the indication of “SLEEP TIMER 0 MIN.” is being displayed, press DISPLAY key and VIDEO STATUS key on the remote control unit simultaneously.
  • The SERVICE MENU screen of Fig.1 is displayed.
  • While the SERVICE MENU is displayed, again simultaneously press the DISPLAY and VIDEO STATUS keys to display the SYSTEM CONSTANT screen.
  • Refer to the SYSTEM CONSTANT table and check the setting items.  Where these differ, select the setting item with the UP/DOWN  key and adjust the setting with the LEFT/RIGHT keys.
  • After adjusting, release the LEFT/RIGHT key to store the setting value.
  • Press the EXIT key twice to return the normal screen.
Posted By: FRANK at 03:44
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