Sony Double Image Solved

CASE: 

• Sony KDL32EX402
• LTY320HM01 panel type A02
• T.con use a dc-dc converter MAX1722
• Problem picture double top to bottom

  

SOLUTION: 

• Lowering the voltage Voff from (-) 12v into a (-) 19v.
• By changing the resistor RD18 (see picture) from 7.5K into a 12K ohm
• The results of the top there is still a bit flawed. Consumers can receive.

(source ) Additional notes:The experience of Wanto Solder - R substituted 12K horizontal image even collapse. Nice pictures after trying replaced 15K



Other Sony case

Samsung 23 inch panel LTA230-AP01 with  2 pieces of  connection FPC left-right ......

Problem 1/3 of the screen is nice .... 2/3 below the bottom of the screen double vertical

Crunch-crunch-crunch ..... circumcision group CKV, CKVB, Vss, STVP ...
Image not double again ............

But the border pas 1/3 2/3 top with the bottom,  sometimes it seems clear / sometimes vague,  there is interference thin green horizontal lines of the line ....... sometimes full, sometimes disjointed

It felt really dissatisfied, ...... because there are disorders that disrupt the middle of the screen ......
Experiments ... continued there ... continued here ..... sometimes added a clear line - can sometimes be reduced .. ......

God is great, the seven seas if used as ink knowledge of God will not be exhausted.Alhamdullillah ......

Perfect ...... .gangguan no longer appears ... ..dengan way R680k pairs of CKV2 direction panels are cut   to the ground

No video blue screen

How to fix LCD TV with No video but Blue Screen and Vertical White Bars

Brand: Hisense TLM-3233D LCD TV

Chassis: MST9

Symptom: No Display but Blue Screen with Two Vertical White Bars
When power on this lcd tv, the screen show no display but blue screen with two vertical white bars. The two vertical white bars will flash but no any content inside. The LCD TV can hear the sound and remote control to change channel properly. Try other video signals input like AV and PC also same results. Even try to call out the OSD menu also same problem too.

Since the LCD TV cannot show the OSD menu and the TV got sound and change channel properly, so that the mainboard is normal. After observation this lcd tv, found that the problem could be in the T-CON board or LCD panel.

Check LVDS and FPC cables, they are show as normal, then check the T-CON board voltages. All voltages in T-CON board are ok, so that i will suspect the T-CON board mainchip (N39) or their memory chip (N31) defective. I got the junk T-CON board with same part number, but their DC-DC chip was burnt. So the mainchip and memory IC can be use.

Because of the N39 (CM2681) have many pins and the memory IC N31 (24LC128) only have 8 pins, so that I choose to replace the N31 first. After replace the N31, I try to power on the TV, and it was show display perfectly!

Since this N31 is a memory IC, does that mean IC itself damage or just the firmware corrupt and caused this problem happen? To find out this answer, I use my programmer to copy the working memory IC firmware and write it into the original memory IC. Do you guess what has happen? Yes, the LCD TV working perfectly too! So the problem solved and it was causing by the firmware corrupted.

Conclusion: The T-CON board memory chip or their firmware corrupt also can cause the screen problem. So that we need to save their firmware and must prepare some junk boards of T-con board, mainboard and inverter board for future use.







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Home » Blog » How to Repair LG 32LB9R-TB LCD TV Random Auto Shutdown

How to Repair LG 32LB9R-TB LCD TV Random Auto Shutdown

Posted by System Administrator in LCD TVs on May 10, 2014 . 0 Comments.





This is an LG 32LB9R-TB LCD TV. The problem was it will auto shutdown after 5 minutes or 30 minutes, sometime after 1 hours then power shutdown. When try to press again the TV power on switch, the Tv will directly shutdown again or after few seconds.

When using table fan to blow the Power Supply board (PSU), and using a piece of card board to block the wind blow to mainboard. The TV can last 2 hours still working properly. After that the table fan change to blow the mainboard and the card board block the PSU. The TV was shutdown just after about 8 minutes! This power supply board is an IP board, the part number is: EAY38637401. Even change the table fan blow the PSU, the TV can last longer to working!

With this method, we know that the problem was inside the power supply board. So I can replace a working power supply board to solve this TV problem. But I want to repair it in components level and want to find out which component is causing the symptom like this.

Since we know that the problem was inside the PSU board, so we can concentrate to testing or troubleshoot this board. Using the hot hair dryer to blow the PSU board to find out which section is sensitive with the heat blow and shutdown the TV. Before that, checking their ERR pin and it was located in PSU board connector. Where the ERR pin features are to detect any high temperature, abnormal current and voltage activity occurs and the mainboard CPU will shutdown the TV to prevent any serious damage in it. I found that their ERR pin voltage was starting (when power on the TV) from 4.68V slowly drop to 3.19V. When the ERR pin voltage drop to 3.28V the TV will shutdown. That’s mean when ERR pin voltage drop to 3.28V, the TV will in protection mode (TV automatic shutdown) .So we need to know which section is causing this voltage drop and causing the TV in protection mode.

This PSU board is an IP board, so their inverter section was built-in into the board. Inside this PSU board, it has PFC section, PWM section, Voltage output section and the High Voltage section (inverter). So using the hot hair dryer to blow to the PSU board carefully and found that the inverter section was the culprit! After that using soldering iron and freeze/Coolant to use interchangeably to testing their small components inside the inverter section.

Finally found the Q311 (1A) smd NPN transistor was defective and it is nearby the U302 (LM393). Replaced it with a H1A (2N3904) smd NPN transistor and the TV working properly now.

After changed the Q311, the ERR pin voltage is about 3.53V. Even this TV working about 9 hours, their ERR pin voltage still stable and it’s about 3.56V.



LCD TV panel ribbons causing vertical lines on one half of screen display, sometimes these lines appears and disappear from the screen. This is a very common problem in LCD/LED TV. Manufacturers of LCD/LED tv are using more cheaper product especially at the budget end, so these devices are meant to expire after the date of warranty.

In this case sticky factory glue which was placed under the LCD panel ribbons begins to fade out with time, and the more it loses  and wear out it  the ribbon cable begins cause contact image problem, which is the vertical line running across one side of the screen.

Now opening up the TV cover and then remove the  metal frame covering the  LCD panel, there you will see the ribbon cable connected to the LCD screen at the top of the TV,go over to the affected area and apply a little pressure you will observe the screen picture getting a clearer picture but you release it the lines appears again on the screen.

LVDS 14 pin

2. LVDS cables‎ > ‎

a. 14 pin cable

Old standard for LCD displays. Sample as below Signals always should be check with datasheet of particular display.  Many times, you can use datasheet of similar display and then check for example positions of GND(using multimeter), to be sure that signals are identical. Usually, GND pins are "fingerprint" of type of cable we must use with. Always check twice or more to be sure. Signals are different for CCFL , LED, laptop and monitor screens, in case of wrong cable use, misconnection or shortcut we risk of burn display or controller or both.  Cable should be done by the same way, after soldering of black socket, some test with LCD, if all OK then black socket should be covered by hot glue, to keep good electrical and mechanical condition.   Sample of signals in 14pin connector

LVDS Pin Data

20 pin cable

Most popular socket for LCD displays. Socket width is about 25.4mm so 1 inch.  Sample as below or this one Signals always should be check with datasheet of particular display.  Many times you can use datasheet of similar display and then check for example positions of GND(using multimeter) to be sure that signals are identical. Usually GND pins are "fingerprint" of type of cable we must use with. Always check twice or more to be sure. Signals are different for CCFL , LED, laptop and monitor screens, in case of wrong cable use, misconnection or shortcut we risk of burn display or electronic or both.  Cable should be done by the same way, after soldering of black socket, some test with LCD, if all OK then black socket should be covered by hot glue to keep good electrical and mechanical condition.     Samples of signal assignment in 20 pin connector    Most typical 1ch 8bit LVDS cable for monitor's and laptop's screens 1024x768 or 1280x1024 , mostly for 4:3 aspect ratio,  ready to use is IN THIS SHOP (works also with 1ch6bit screens)

LVDS 30 Pin Data

d. 30 pin cable

Most popular socket for LCD displays. Sample as below or looks like this one with pins Signals always should be check with datasheet of particular display.  Many times you can use datasheet of similar display and then check for example positions of GND(using multimeter) to be sure that signals are identical. Usually GND pins are "fingerprint" of type of cable we must use with. Always check twice or more to be sure. Signals are different for CCFL , LED, laptop and monitor screens, in case of wrong cable use, misconnection or shortcut we risk of burn display or electronic or both.      Cable should be done by the same way, after soldering of black socket, some test with LCD, if all OK then black socket should be covered by hot glue to keep good electrical and mechanical condition.      Samples of signal assignment in 30 pin socket       Most typical for laptop's 1280x800 or 1366x768 screens (but not only), ready to use LVDS cable 1ch 6bit is IN THIS SHOP

40 Pin Data

 40 pin cable

Most popular socket for LCD displays. Sample as below or this Signals always should be check with datasheet of particular display.  Many times you can use datasheet of similar display and then check for example positions of GND(using multimeter) to be sure that signals are identical. Usually GND pins are "fingerprint" of type of cable we must use with. Always check twice or more to be sure. Signals are different for CCFL , LED, laptop and monitor screens, in case of wrong cable use, misconnection or shortcut we risk of burn display or electronic or both.  Cable should be done by the same way, after soldering of black socket, some test with LCD, if all OK then black socket should be covered by hot glue to keep good electrical and mechanical condition.   Samples of signal assignment in 40 pin socket    Most typical LED LCD ready to use 40pin 2ch 6bit cable (works also with screens 1ch 6bit)  is possible to get cheap IN THIS PLACE

Backlight

Backlight

To be possible to see picture on LCD display, at back of LCD glass must be ambient white light and that we call "backlight" . In LCD screens are two types of backlight, doing the same job, made light able to see picture on LCD :  - CCFL lamp backlight  - LED strings/chains backlight    LED backlight subject is more complicated than CCFL, so it is separated to this subpage a. LED backlight   ------------------------- Here is information about CCFL lamp backlight and his driver named "inverter". Work with lamps is easy, as basically any inverter can drive any CCFL lamp, so we can exchange inverters for the CCFL lamps and always it should work good. To have ease work with inverters, I recommend to use universal inverters available in China,  they works always well. You can use bigger one or smaller, possible to hide in laptop bracket. Those universal inverters have one more advantage, that they work even if CCFL lamp is a bit "tired" (no keeps parameters), in such case normal inverter will turn lamp off but universal will still lights up.     Small universal inverter works in wide range of supply Voltage 5V-28V, is available in this store with good prices ------------------------- Some ask if possible to use laptop's inverter,  answer is yes and not   Normally, in laptop along with LCD screen in bracket are also CCFL inverter. So why to not use this inverter again with our LCD screen ? Well, theoretically it is possible as in general all inverters works in the same principles. It need power, GND , BL(on/off signal) and ADJ(dimming) , unfortunate the problem is usually in details. Inverters use various chips and electrical parameters of inverters vary from brands and vendors. Some inverters need power 5V only, some 12V, some 18V-20V. Some need two voltages. BL signal range for some is 0V-1.8V, for some 0-3V, for some 0-5V etc. Dimmig also between 0-5V or 2V-4V or 0-1.9V, some need 3bit digital dimming, etc. All depends on particular inverter from particular laptop. Some are working well with power 12-18V and have BL as 0-5V - so will work for us without problems, but we must know about this parameters for sure.  In generally, they are a bit problematic. So, that mean is not possible to use them ? no, is possible to use them but we need more readings and more work, what is time consuming. If do not like reading, measuring and soldering etc. - simply buy universal CCFL inverter, they are not expensive.            Otherwise, below are samples, how to use the original ones. More easy to reuse are CCFL inverters in monitors, they usually works well without problems using 12V,GND,BL and ADJ  signals. Normally, only BL signal is enough for good work. Also is possible, to use universal inverters for 2 or 4 CCFL lamps 2 lamp inverter you can buy  IN THIS SHOP    4 lamp inverter is available IN THIS SHOP  or THERE         ------------------------------------------------------------------------ First example, it is inverter from HP (do not know model) , normally this inverter will not work at all with universal board, but after reading of OZ960 chip datasheet, there was information about two voltages, 12V for lamp's transformer and additional 5V supply for chip, BL range was normal 0-3.3V. OK let check it with his original display, 15'' display 1024x768.  First testing with universal inverter to check display works well, than connection of 12V, 5V, GND and BL for original inverter - it works    --------------------------------------------------------------------------- Another sample is bracket with 1280x800 display. It have inverter made on MP1011 chip, and works as good as universal inverter - so we need only 12V, GND and BL for proper work Let check it - it works :)        Bracket is closed

How to convert in LED Tv

. How to made 22" LED TV

Here is described how to make a DIY fullHD LED TV,PC,AV,HDMI,USB player from broken 22" monitor. To get the idea what about, before read this side, is recommended to read and understand information from this subsides 6. LCD as PC VGA,HDMI,AV,TV display TSUMV59  d. 30 pin cable    a. LED backlight b. step-up converter as LED driver Sometime, when I got opportunity, I am buying some broken monitors as parts donors, many times I repair them and sometime made them usable again as my experiments :) . Lastly I bought on Allegro (it is kind of Polish Ebay) broken monitor LG E2242 , seller wrote that electronic is completely destroyed by thunder and possible that screen also. Specification say that is HD 1920x1080 LED screen. OK, lets open it. Indeed, electronic board was destroyed, no sign of life, so I decided to test screen and use as donor for universal LCD controller.   The screen type is LGM215AC01, so after little googling there are not any sign of datasheet for this screen. So I analyze LVDS cable and made measurement of GND pins in connector of screen, so I knew it is standard monitor LVDS input 2channel 8bit like that one   Screen was not working with 3.3V, so jumper was changed for 5V, at 5V screen works well. As usually the problem is to obtain LED driver parameters, the procedure how to do that is described here (BTW on this screen) b. step-up converter as LED driver As there no other option, I decided to use XL6009 step-up converter universal module, as LED driver. 170mA-180mA  was the current chosen for LED, so driver was set to 39.2V, at this voltage screen is very bright, the same bright level, as any other factory LED TV . I decided to use universal LCD controller with TSUMV59 chip described here 6. LCD as PC VGA,HDMI,AV,TV display TSUMV59 Now, is time to made all parts together. First of all, the most time consuming, was to choose where to screw controller board, finally good place was at the right of back cover. Under controller, there are placed some foam spacers to made board a bit tide . Spacers are mounted (in Apple style) by double-side adhesive tape, than controler was screwed.       Now is time to add LVDS cables, solder LED cables to LED driver and mont LED driver by double-side adhesive tape (Apple high-tech style) at place, when is still possible potentiometer regulation through D-SUB hole.       Let made some test, what a nice surprise, excellent picture quality. So nice colors, brightness, everything so good as in regular LED LCD TV :) . TV works with supply power unit 12V 2A, that small power unit, directly connected to wall adapter. The supply power unit is not even hot, it simply a bit worm after few hours of work. Some samples of analog TV and as HDMI monitor connected to MacBook Pro.          --------------- Keyboard After successful testing, I decide to use original keyboard. For that, was very helpful knowledge that controller supports A/D keyboard type (Analog to Digital converter is used at keyboard input) , what was described here 6. LCD as PC VGA,HDMI,AV,TV display TSUMV59  So I prepared two wires for keyboard and one wire for Red status LED. Also added proper resistors in series with each switch to made them work as particular functions. Status LED light "red" when device is turned OFF, when device is on, status LED is not light and only flashing when any key on remote is pressed, so indicating that remote control is working - that very good solution .   Original keyboard works perfectly as 5 keys keyboard.           --------------- Speakers, that important part of TV. I found a pair of nice speakers from broken laptop, they play very good, so time to use them at TV. As usually best way for mounting, is some adhesive tape. They playing very good, especially when was a bit regulated Volume curve in "service menu".                                                                  Final set looks very compact and works very good.              --------------- Finally it is time to cover the electronic board. I used that what was available at hand at home. So a plastic package of PC mouse, a black dokument cover and some double adhesive tape. Blistro was covered by black plastic, all was glued by adhesive. Pictures are self explaining.    At last, end of two days work, so time to see a movie from USB drive. I exchanged this TV/monitor with my PC 22" VGA for testing, I passed FarCry4, works as good as any other VGA PC monitor :) .         --------------- I had a questions - What is the costs of such TV? Broken LG monitor about 25$ with delivery Controller 14$ Step up converter 2$ Supply power 4$ So Total about 45$  Well, in store such similar device cost about 180$  But is not all, there was also two nice afternoons for fun and assembling :) . And biggest advantage is, that I gave for my self guarantee for this device, till end of my life - hehehe :) .