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Old 07-05-2018, 06:55 PM   #381
budm
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Default Re: LCD TV and Monitor basic troubleshooting guides

Correct way to report the Voltage reading at the connector:
CN201 connector from Power Board to Main Board:
Pin__Label_____TV off volts__TV on volts
1____3.3V________3.33__________3.31
2____AC-DET______3.41__________3.39
3____PS-ON_______0.08__________3.28
4____12V-AU______0.60_________12.24
5____GND_________0.00__________0.00
6____GND_________0.00__________0.00
7____GND_________0.00__________0.00
8____12V REG_____0.56_________12.24
9____12V REG_____0.54_________12.24
10___BL-ERR______0.00__________3.26
11___LED-ON______0.00__________3.24
12___LED-BR______0.00__________0.82
13___NC__________0.00__________0.00
14___T2V T CON___0.04_________12.24
15___T CON_ON____0.00__________3.17

Thanks for splinke for making easy for us to help: https://www.badcaps.net/forum/showthread.php?t=70560
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809

Last edited by budm; 07-05-2018 at 06:56 PM..
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Old 07-22-2018, 01:00 AM   #382
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Default Re: LCD TV and Monitor basic troubleshooting guides

Hey all! I''m not sure if it's ok to ask some help from this thread or if i'm supposed to post a new thread. I'll go ahead and state my issue and just let me know if i'm doing something wrong lol.

Anyways, my Sony 46" KDL46V5100 just stopped working, as i was watching, it suddenly had like a faded blurring picture and just went black and no sound whatsoever. It's been like that since. So reading the LCD trouble shooting guide posted in the thread, it sounds like my main board needs to be replaced and wanted to see what you think.

Symptoms: No picture, no audio and no backlight. I also did the flashlight test and didn't see any images.

Troubleshot:
- Power supply board: I have my standby 3.3V and ON/OFF 3.3V, and the 15V & 12V going to main board. I also have 12V going to the TCon board.

Unsure about power supply:
- Dimmer(.49V), backlight on/off(1.15V), inv_err(2V), gnd, & barancer_err(0V), this connecter i measured at leads to the main board. I assume these voltages aren't correct and should be more?

- VCC(12V), FB(0), FB(0), GND, GND, LD(11.4), LD(11.4V), this connector leads to the inverter board. Are these voltages good or no good? I get 11.4V on LD and 0V on FB and i don't know what these are. The VCC 12V is there tho and that's what the board is marked at so that should be good.

I also checked the power supply fuse and that's good. So after reading the troubleshooting guide again, I'm thinking the main board. Please let me know what you think, thank you in advance!
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Old 08-13-2018, 01:49 AM   #383
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Default Re: LCD TV and Monitor basic troubleshooting guides

Thank you
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Old 09-20-2018, 12:34 PM   #384
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Default Re: LCD TV and Monitor basic troubleshooting guides

LG 50LA6205 bad panel with taped off fixed by neilc6 and davi.p
https://www.badcaps.net/forum/showth...904#post851904
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Old 09-25-2018, 02:52 PM   #385
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Default Re: LCD TV and Monitor basic troubleshooting guides

Info about T-CON:
Info provided by http://tvrepairsolution.blogspot.com
http://tvrepairsolution.blogspot.com...l-rowgate.html
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Old 10-01-2018, 12:54 AM   #386
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Default Re: LCD TV and Monitor basic troubleshooting guides

AOZ9148 LED driver IC used in many Samsung LED power supply section.
Attached Files
File Type: pdf AOZ1948_LED driveri.pdf (726.9 KB, 72 views)
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Old 10-04-2018, 10:33 AM   #387
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Default Re: LCD TV and Monitor basic troubleshooting guides

Samsung UN50H5203
https://www.badcaps.net/forum/showthread.php?t=72153
https://www.badcaps.net/forum/showthread.php?t=72173
This is related to LED driver topology such as the one using AOZ1948 IC.
Samsung boards BN44-00775A, BN44-00772A use that topology.
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Old 10-31-2018, 10:07 AM   #388
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Default Re: LCD TV and Monitor basic troubleshooting guides

Great job Bud M.
Very handy and informative guides.
Keep it up
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Old 10-31-2018, 10:36 AM   #389
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Default Re: LCD TV and Monitor basic troubleshooting guides

SONY LCD TV (I.E. Sony KDL-55EX700, Sony KDL-46EX710) 7-Blink code for temperature error. This can be fault direction, it can be due to problem in the HLR board.
https://www.badcaps.net/forum/showthread.php?t=46810
https://www.badcaps.net/forum/showth...ard#post706697
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Old 11-13-2018, 10:07 PM   #390
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Default Re: LCD TV and Monitor basic troubleshooting guides

TFT-LCD Production Process Explained: LG
https://www.lgblog.com.my/2014/10/15...ess-explained/

Understanding Today's LCD Screen Technology: Samsung
https://pid.samsungdisplay.com/en/le.../lcd-structure
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Old 11-15-2018, 11:05 AM   #391
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Default Re: LCD TV and Monitor basic troubleshooting guides

LG T-CON Training manual.
Attached Files
File Type: pdf LG-TCON.pdf (6.10 MB, 64 views)
File Type: pdf OEM_AUO_T260XW02_BN07-00638A_T-con_[SCH].pdf (337.4 KB, 43 views)
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Old 11-26-2018, 10:02 PM   #392
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Default Re: LCD TV and Monitor basic troubleshooting guides

Some interesting read about the TV display technology.
https://www.displaydaily.com/article...heir-tv-allies
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Old 12-04-2018, 12:50 PM   #393
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Default Re: LCD TV and Monitor basic troubleshooting guides

http://televid-sib.ru/index.php?topi...9572#msg139572

TRAINING VESTEL 17MB 120
Registration required!
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Old 12-07-2018, 11:15 AM   #394
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Default Re: LCD TV and Monitor basic troubleshooting guides

Panasonic training material:
http://service.panasonic.ca/pcs/EXT_...circuit_v2.pdf
Attached Files
File Type: pdf Panasonic 2015 LCD_technical_guide_circuit_v2.pdf (2.54 MB, 40 views)
File Type: pdf Panasonic 2016 LCD technical guide.pdf (9.49 MB, 47 views)

Last edited by budm; 12-07-2018 at 11:29 AM..
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Old 12-07-2018, 08:08 PM   #395
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Default Re: LCD TV and Monitor basic troubleshooting guides

Quote:
Originally Posted by budm View Post
Thanks!
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Old 12-14-2018, 08:49 AM   #396
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Default Re: LCD TV and Monitor basic troubleshooting guides

Panasonic Training LCD TV links
See Page 15
LCD TV and Monitor Basic Troubleshooting guides

Last edited by thoma; 12-14-2018 at 08:50 AM..
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Old 12-21-2018, 12:50 AM   #397
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Default Re: LCD TV and Monitor basic troubleshooting guides

Many thanks
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Old 01-01-2019, 06:33 AM   #398
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Default Re: LCD TV and Monitor basic troubleshooting guides

Great job ,guys. Happy new year.
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Old 01-05-2019, 12:37 AM   #399
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Default Re: LCD TV and Monitor basic troubleshooting guides

Please help.! What is the problem Sony 32bx320 with sound but no pictures
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File Type: jpg Screenshot_20190105-073640_Video Player.jpg (1.03 MB, 11 views)
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Old 01-25-2019, 10:45 AM   #400
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Default Re: LCD TV and Monitor basic troubleshooting guides

Power supply output impedance.
http://powersupply.blogs.keysight.co...impedance.html

https://community.keysight.com/commu...c-power-supply

https://community.keysight.com/commu...haracteristics

https://community.keysight.com/exter...ulate-its.html
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