CE Tech Tips – September 2016
CE Professional Tech Tip Sharing
September 2016
**NOTICE**
Due the danger and complexity of electronics repair, the following shared technical tips are intended for professional reference only. Please refer to manufacturer’s recommendations as Encompass does not guarantee the accuracy, reliability or safety of this information.
Hitachi TV, 42HDM12A
Reason for Service: Solarized picture
Solution: Check connector P36 on the main board for a bad connection or bent pin.
LG TV, 42LV4400
Reason for Service: Dead set
Solution: Replace the flash IC, at U18, #COV31451901. If you can’t replace this IC, replace the main board.
Mitsubishi TV, WD65732
Reason for Service: Picture has a haze over it
Solution: Taking the lens assembly apart and cleaning all glass fixed the set.
Orion, (Sansui) TV, HDLCD3250F
Reason for Service: Dead or intermittently dead
Solution: Remove main board SM cap C6212.
Pioneer TV, Pro 710HD
Reason for Service: Picture too dark
Solution: Look for excessive bad solder on power supply board and resolder all.
RCA TV, L42WD250YX6
Reason for Service: Set would boot up for a few seconds, then shut down with 5 blink code
Solution: Found many bad caps in power supply and on buffer board. Replacing all fixed the set.
Samsung LCD, LN40A500T1FXZA
Reason for Service: Picture too dark, some solarizing, too much color, audio is ok
Solution: T-Con was bad, MS35-D026047.
Sanyo LCD, DP42849
Reason for Service: Dead, green light comes on for a few seconds then goes back off
Solution: Replaced IC5750, got it from Sanyo.
Vizio TV, E421VO
Reason for Service: When you turn set on, you see splash screen for a few seconds, then backlights go off, no video, OSD or sound. Could not turn set back off.
Solution: Replaced the IR receiver board.
Comments (3)
Your Tech. tips are invaluable when it comes to saving time,
I as a servicing Technician for over 40 years appreciate them.
Thanks
Will register with you for other appliance Tech. tips as well.
Bernard J. Methot Esq.
Journeyman Electronics Technician
Cold lake, Alberta Canada
T9M-1B1
Thanks so much for the feedback, Bernard! Our goal is to help our pro customers be successful in any way we can.
GOOD DAY TO YOU ALL IN ALBERTA.
Having serviced a multitude of Televisions from CRT type to Flat screen Television with OLED, led, backlite, and many more. What makes a repair by a layperson, is to analyze the SYMPTONS accurately and go about taking the back off the set and looking at the type and number of boards operating within, Some sets have 3 or 4 Boards, some only have two (piggy back type). Go to the internet and google model and version type Board that is enclosed, if you have access to a VOM, that is all you need for most minor problems with Boards. Look at the top of most boards and you will see a history of voltages printed on the board and points location where to access these readings on your VOM. Your first and foremost is the voltage derived for the instant on feature of the set, without a proper voltage there nothing will happen, normally that 13 volts must be there, and usually will be a shorted diode or Electrolytic capacitor, Replace them. You will find that in most instances it will correct your problem. If the set has no white on the screen, but sound is normal, get a brite LED flashlite, turn on your television, and see if the video is visible on the screen, if it is, you have shorted LED’s in the back cover. With a small power pack the problems with ALL LED’S can be analyzed quite easily. Well I will clear this episode and trust that you will be successful on your next attempt at being a service man.