No High Voltage - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 5 Old 11-11-14, 08:29 AM Thread Starter
Shackster
 
Join Date: Jul 2011
Posts: 9
No High Voltage

Hi,

Brand : Toshiba
Model : 43JH9UM equivalent to 43CJH9UR, 43JH9UE, 43JH9UT
Description : 43" RPTV (R,B,G Guns), 8 Years old
Service Manual and Circuit : http://www.scribd.com/doc/65312424/43jh9um
Power Board : PD2026 Pg.43 of Service Manual

Problem : No High Voltage, Low voltage is present

History :
  1. The extension wire connected to the tv shorted out,
  2. but the tv was fine until i closed it and reopened,
  3. there was no power, fuse was blown, changed it but no power again,
  4. took to some of the local electricians they denied help with projection tv's, one of them replaced the power resistor (R811) which seemed to fix the power supply
  5. but only the leds and power light was on there was no high voltage no hissings, the caps wont charge or anything
  6. if i pressed the power button on the remote only the leds would turn off and on

My Experience :

Soldering, and meter testing(using google) from 1-10 il give myself a 3.

Need Help Thanks !!
cyber02000 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 11-29-14, 03:15 AM Thread Starter
Shackster
 
Join Date: Jul 2011
Posts: 9
Not really ...I tested the mosfet isnt working the sdr thing ..I just gave up and threw.the tv away
cyber02000 is offline  
post #3 of 5 Old 11-29-14, 02:06 PM
Plain ole user
 
lcaillo's Avatar
Tech Guru
 
Join Date: May 2006
Location: Gainesville, FL, USA
Posts: 11,121
Send a message via AIM to lcaillo
Re: No High Voltage

Sorry, I missed this one, too.

You need to find a service manual and determine what voltages are present and which are not. When you say it was fine until you opened and closed it, what did you do to it?




Looking for me, just google my username. I have used the same one for most sites for many years.
lcaillo is offline  
 
post #4 of 5 Old 12-04-14, 10:55 PM Thread Starter
Shackster
 
Join Date: Jul 2011
Posts: 9
Hey thanks for the reply ive given up on the tv i got it checked and the power board needs replacement ...and since i cant find the replacement i was thinking of implementing an lcd inside so that it is projected on the screen ! Do you know anyone who might have done this ?
cyber02000 is offline  
post #5 of 5 Old 01-05-15, 04:49 PM
New Member
 
Join Date: Jan 2015
Posts: 1
Re: No High Voltage

cyber02000, this is because the power card can’t take the load of the projection. You don’t really need to change the whole power supply if you know your way around circuits. The first thing you need to do is a visual inspection, check if there’re any blown up capacitors or bad resistors which might be causing this. If you don’t see any just try and find out if there’s any bad IC by checking the short circuiting using a multi-meter.

ball grid array

Last edited by carkifelek; 01-14-15 at 04:28 PM.
carkifelek is offline  
Reply

Bookmarks

Tags
high , no high voltage , no picture , voltage

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome