Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 !

Sunday, 2 February 2020

SAMSUNG QLED TV QE49Q8* - HOW TO UPGRADE THE SOFTWARE, BACKLIGHT TEST, HOW TO ENTER THE FACTORY MODE, REPLACING THE MAIN BOARD AND SERVICING ADJUSTMENTS

Applicable to:

QE49Q8*, QE55Q8*, QE65Q8*, QE75Q8*, QE85Q8*

Project : Q7Q80D: Chassis: QWH00

TV POWER STANDBY TEST
Power TV On
POWER ON .2Vdc (when off) changes to 3.3Vdc (on)
Note: Will stay On for short time when powered off.
If voltage error or no change:
Jog Function & IR Control Test
If OK replace Main Board:
All 13V supplies for approx. 12.7VDC
If any wrong voltages, remove SMPS connector to Main Board:
All A13V again for 12.7VDC
All Vamp supplies for approx. 18 VDC
If OK replace Main Board:
If still wrong voltage replace SMPS:
OVD_LEVEL (Over Voltage Detect) 3.3Vdc : Operating Normal
If 0V or changing, an SMPS or Panel error exists. Perform Backlight Test.
Backlight On/Off : OV Off to 4.4Vdc On- If missing or error : Replace Main Board.
Backlight ON
Backlight On/Off 0V Off to 3.4Vdc ON (LD Board CN9003A)
Vdrv supplies to LD Board (approx 78V dc with multi meter)
SMPS/PANEL BACKLIGHT TEST
1. Activate Backlights Test : Disconnect Lead Cable from Main to Power supply.
TV Screen for active backlight LEDs.
2. If No BACKLIGHTS
Minus(Control) pins & Plus(Supply) pins voltages on the Panel connector. (with fine test probe on left side of connector only for safety)- If no pin voltages replace SMPS.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
SIMPLE BL ERROR TEST:
Check each panel ribbon configuration.
If any have a different number of pins or a different pin or drive configuration do not perform this simple test go to additional backlight test.
If each have same number of pins and exact pin configuration.
Verify exact Panel Backlight error location (dark vertical line)
Turn off TV and Remove AC Power
Swap the two adjacent panel ribbons in that area
Reconnect AC Power and turn on the TV
Check location of defect (dark vertical line)
If the defect remained in the same location the panel is defective.
If the defect moved to another location the LD Board is defective (NOTE: In rare cases the Main Board may be
defective since it provides Local dim control.
BACKLIGHT DIMMING PROBLEMS
Go to Menu > Picture > Expert Settings > Backlight and vary level (0 ~ 50)
If no backlight changes observed :
Panel Connector minus (-) pin voltages and ANA-DIM voltages CNM801 while changing backlight level.
If minus(-) pin voltages don't change, and ANA-DIM changes, replace SMPS
If ANA-DIM doesn't change replace Main Board.
Use : MUTE > 4 > 1 > 9 > EXIT to test Panel Vertical Backlight Sections in normal operation mode.

Factory Mode

Factory Remote
1. Power TV ON.
2. Select TV Source.
3. Info → Factory.
4. Use MENU for return.

Samsung IR Remote
1. TV Power Standby.
2. Press as follows.

NTSC - MUTE > 1 > 8 > 2 > POWER

PAL - INFO > MENU > MUTE > POWER

Important items

Option (must set Option Bytes when replacing Main Board.)

Option → Factory Reset (returns TV to out of box condition. Does not reset Apps.)

SVC → Test Patterns
SVC → Info → ER Count (Important to check for errors.)
Control / EDID (Use to Reset HDMI Operational Errors)

Setting Option Bytes
1. Enter Factory Mode with Service Remote (only).
2. Check Option Byte Table located on GSPN (Fast Track or Tips).
3. Select Option
4. Select each item to change
5. Can Use new Writing Type to enter model (if entered wrong it will not change)
6. Soft power TV Off to load

Performing Factory Reset

1. Enter Factory Mode

2. Select Option / Factory Reset

3. TV will power off.

4. Perform ALL TV Settings (New out of box condition)

Replacing Main Board

When replacing Main Board, certain values needs to be manually input in Factory menu to complete the replacement.

Enter Factory Menu (Use Factory Remote only)

Power TV on: Select TV Source > Info/Factory > Option

Change each value according to the TV Model.

Type, Local Set, SW Model, BOM Model must be set to correct value.

Sample Model: QN85Q900RAFXZA

Check Panel label (located in the back chassis of panel) and choose same Type code from the list.

SVC > Test Patterns

1. Verify "Scaler Pattern" and "US Post Pattern".
2. Verify "FRC Pre Test Pattern".
3. Verify "FRC Post Test Pattern".
4. Verify "SoC TCON Test Pattern".

Factory Mode / Control / EDID (Restoring HDMI Inputs)

Remove ALL HDMI connections

Factory Mode/Control/EDID (Press Enter)

Select EDID/OFF to ON (Right Arrow Key)

Select EDID WRITE ALL (Enter)

Wait to Success (Right Arrow Key)

Confirm EDID WRITE ALL Success (Menu Key)

SVC > Info > ER Count

Check each item listed
IMPORTANT ITEMS
WD Count Watch Dog(Hardware related issue)
AR Count: Auto Reset(software (i.e. Apps) related
WiFi Count(Check all listed items)
BT Count(Check all listed items)
Serdes OCB Optical Cable Error)
AC-Over Voltage Detect(AC Supply related - New 2018)
VCC Fail Count(DC Supply related - New 2018)