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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 20 March 2019

BBK LT 3210 - LT 2610 - SERVICE MODE - SERVICE ADJUSTMENTS - INITIALIZATION - WORKINIG PRINCIPLE

BBK LT 3210 - LT 2610 - SERVICE MODE - SERVICE ADJUSTMENTS - INITIALIZATION - WORKINIG PRINCIPLE

ADJUSTMENTS
Connect all the boards according to wiring diagram, then power on and observe the display.
Method for entering factory menu:
  • Press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory menu.
  • Press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust value items.
  • Press “MENU” repeatedly to exit.
Method for software upgrading:
  • When software upgrading please enter factory menu first, select ISP of OPTION.
  • Set ISP to 1 and you can begin to upgrade.
  • After upgrade finished, it needs to set ISP back to 0.
  • If the picture can’t display when upgrading, it needs to solder JB1 on main board.
  • Unsolder JB1 again after upgrading.
Initialization
  • Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, adjustment of  items to see table.
IF AFC adjustment
  • Disconnect J1(B face), input 38.9MHz PAL signal of 80dB to the pole of J1 near L11, Adjust L5 to value 1.25V of TP2. Enter factory menu, adjust TDA4470 from BG to LL, input 33.9MHz SECAM signal of 80dB, adjust R71 to value 1.25V of TP2 then solder J1.
IF AGC adjustment
  • Input 184.25MHz(PAL/BG) RF signal of 60dBuv to RF terminal, adjust R64 to value 4V of TP4 and there should be no obvious snowy picture. Increase the signal to 90dBuv and it should be display normally and no obvious noise.
White balance adjustment of HDMI
  • Input VG-849 signal from HDMI: TIMING854(800* 600/60Hz) and eighth-level gray scale signal of PAT920. Use color analyzer CA210 to adjust white balance.
  • Enter submenu of COLOR TEMP, Select 9300k of color temperature
  • Fixed value of B OFF, adjust R OFF and G OFF, let the color coordinate of the second level be (285, 293) and the brightness be about 3nit-6nit. Fixed value of B GAIN, adjust R GAIN and G GAIN, let the color coordinate of the seventh level be (285, 293). Adjustment R OFF, GOFF, R GAIN and G GAIN repeatedly until the value of the two levels gray-scale are (285, 293).
  • VGA/YPBPR/AV white balance check and correct
  • Input VG-848 signal of VGA to VGA terminal: TIMING854(800*600/60Hz) (PATIERN:CROSS) and auto adjust to full screen, then input PAT948 Black/white signal, enter factory menu ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, enter COLOR TEMP menu and set ALL COLOR to 0 and fine adjust according the above method.
  • Connect VG-848 signal of YPBPR to YPBPR terminal and input TIMING972(1080i/60HZ) 100% color bar of PAT976(include black/white bars), Enter ADC ADJ submenu, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method stated above.
  • Input AV signal (PM5518, 8 gray levels, NTSC) to VIDEO1 terminal, check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of  stated above.  
Note: it can’t set back to 1 once ALL COLOR changes to 0.
Working principle analysis of the unit
  The RF signal received by antenna will be sent to tuner TUNER101, then IF signal will be obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V15, then it will be sent to acoustic surface-wave Z17 to do IF filter and get better IF characteristics, then it will be sent to N3 (TDA4470) to do intermediate amplification, phase-locked loop VCO and synchronous wave detection to get video signal TV-V; after pre-intermediate amplification IF will also be sent to acoustic surface-wave Z16 to do filter at the same time, then it will be sent to TDA4470 to do intermediate amplification and output the second sound intermediate frequency signal (TV-SIF). The TV-V signal output from TDA4470 together with TV-SIF will be sent to main IC NS2(MST9E19B). Video signals of VGA and HDMI will be sent to MST9E19B, too. Video signal of YPbPr and Video RGB of SCART1 via video switch NB24(PI5V330) will be sent to MST9E19B. Video signal V (CVBS) of SCART1, YPbPr L/R and SCART1 L/R will be sent to MST9E19B. The main IC NS2(MST9E19B) is a high performance and fully integrated IC, which can realize HDMI processing, video demodulating, video switch selection, A/D and D/A conversion, interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, etc. And it also has functions of audio selection, processing and MCU. The video signal via MST9E19B processing, output 4 pairs differential signal and 1 pair clock signal for LCD panel display. TV-V output from TDA4470 via double video amplifying, it will be sent to SCART1 for AV-OUT.  Audio signal via MST9E19B processing will be sent to sound amplifier NV4 (R2S15102NP) amplifying to speaker. TV-SIF via MST9E19B demodulating and sound processing then output to NV3(LM358D) amplifying, the signal will be sent to SCART1 as AV-OUT.
Posted By: FRANK at 03:23
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