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 23 February 2019

HP MDTV REAR PROJECTION TV - L1735A - L1736A - L1737A - L1798A - FACTORY MODE AND ADJUSTMENTS

HP MDTV REAR PROJECTION TVs - L1735A - L1736A - L1737A - L1798A - FACTORY MODE AND ADJUSTMENTS

How to enter Service Mode to HP MDTV - Rear Projection TVs

TO ENTER SERVICE MODE [FACTORY MODE]

To enter factory mode menu: Press 'Source', "-", "CC", "SAP".

ALIGNMENT AND FUNCTION TESTS

  1. Original customers source test =>  Press 'source' button on the remote control and choose the customer's original settings =>  Test the defect of customers' complaint and confirm that the main defect have been solved.
  2. Composite Video Test => [1] - Press 'Source' button on the remote control and select source to Video-1.   [2] -  Connect to DVD composite signal.  => Check any abnormal color, line distortion or any noise in the screen.  Check the sound from the speaker.
  3. Component Video test => [1] -  Press 'Source' button on the remote control, and select 'component-1' [2] - Connect DVD component signal => Check any abnormal color, line distortion or any noise in the screen.  Check the sound from the speaker.
  4. HDMI Video test => Press 'Source' button on the remote control and select HDMI-1.  Connect DVD HDMI signal. => Check any abnormal color, line distortion or any noise  in the screen.  Check sound output.
  5. DVI Video test => Press 'Source' button on the remote control, and select HDMI-2.  Connect to DVD DVI signal, including audio signal =>  Check any abnormal color, line distortion or any noise in the screen.  Check for good sound too.
  6. Tuner test [Antenna] => Press 'Source' button on the remote control, and select Antenna.  Connect the antenna => After auto-scanning, press Ch Up/Ch Dn buttons to test channels.  Check if lines abnormal color and zigzag on image.
  7. Tuner test [Cable] =>  Press 'Source' button on the remote control, and select Cable => After auto-scanning, press Ch+/Ch- buttons to test channels =. Check if lines, abnormal color and zigzag on image.
  8. Kepad test => Press source button on the remote control and select Component-2 => Connect DVD component signal => Check if keypad function works well.
  9. Remote control test => Press 'Source' button on the remote control and select Video-2 => Connect DVD composite signal => Check if remote control function well.
ADC CALIBRATION
ADC - YpbPr Calibration.
  • Input 'SMPTE' test pattern from generator to TV component port.
  • Enter Factory mode.  Use cursor on the remote and select 'ADC Calibration' setting.
  • Press 'OK' on the remote control.
ADC-VGA CALIBRATION
  • Input 16 gray scale pattern from generator to TV VGA port.
  • Enter Factory mode.  Use cursor on the remote to select 'ADC Calibration' setting.
  • Press 'OK' on the remote control.
FIRMWARE UPDATE PROCEDURE
  • Software:  Zappa Projection Firmware.
  • Hardware:  Zappa Projection TV; USB Flash Disc.
USB UPGRADE FUNCTION OVERVIEW
  • Zappa builds in USB OTG chip for F/W upgrade process; user just put F/W hex code into the USB Flash Disc, and then plug it in to USB receptacle of TV,  system will upgrade F/W to appropriate unit.  There are 7 units can be upgrade, MTV512, VGA EDID, HDMI 1 EDID, HDMI 2 EDID, Pixel Works Flash, DTV module Flash and CSC 1220.
USB Flash Disc Usage.
  • Zappa USB OTG only recongnizes USB flash disc drive, other drives will be ignored.
  • File system:  USB driver supports FAT 12, FAT 16 and FAT 32 file systems.  Also supports OTG HOST mode only.
  • File location:  User can put F/W hex code in any directory or root directory.
  • Sub File Name:  Current driver only can recognize *hex sub file name.  So need to rename the sub file name to be "hex", such as DTV module, that F/W file name is "vxWorks_user.bin", need to rename it to be "vxWorks_user.hex".
  • File Name:  Driver recognizes prefix file name and then decide which unit should be upgraded.  Can put any characters after prefix, such as date or version .  For example, Mtv512_v02.hex, "Mtv512' is the prefix and driver will recognize it and upgrade it to MTV512. 
USB UPGRADE PROCEDURE
  1. Put F/W hex code to USB Flash Disc.
  2. TV power state at standby mode.
  3. Plug USB Flash Disc to USB receptacle of TV.
  4. LED rotates.  Except MTV5 Unit.
  5. Waiting for POWER LED flash or all LED off [MTV512].
  6. Power On Tv.
  7. TV shows Upgrade Complete List report.
ERROR HANDLING
  • What situation error message occurs.
  1. Upgrade PixelWorks without flasher.hex.
  2. Unplug USB disc during updating.
  3. HEX file format not correct.
  4. Upgraded unit no response.
Posted By: FRANK at 06:05
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