Author |
Message |
1968RT
Joined: 13 Mar 2010 Posts: 51 Location: michigan
|
Posted: Thu Sep 26, 2013 10:19 pm Post subject: Toshiba 32HF72 dead |
|
|
No picture no sound. TV power LED was flashing after power up. Found fuse F470 (2A, 120V) blown and resistor R380 (22 meg) cracked. Both were replaced. Power LED now stays solid after power up, but no audio or video. Relay click can be heard at power up and down. No other burned or bulging components noticed. Can you point me in the direction of the next diagnostic check? Thanks in advance. Mike. |
|
 |
Google
|
Post subject: Advertisement |
|
|
|
 |
JTS1957
Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away
|
Posted: Fri Sep 27, 2013 12:34 am Post subject: |
|
|
Check Q404 (2SC5570) Horizontal output transistor and C416 (33ufd 100v) capacitor.
What circuit / area is resistor in? |
|
 |
1968RT
Joined: 13 Mar 2010 Posts: 51 Location: michigan
|
Posted: Thu Oct 31, 2013 8:40 pm Post subject: |
|
|
Horizontal transistor was bad. Replaced it and the cap. On power up, the power led now stays solid, but still no audio or video. Any suggestions? |
|
 |
JTS1957
Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away
|
Posted: Thu Oct 31, 2013 8:58 pm Post subject: |
|
|
Make sure its NOT set to a input/source that you have NO active signal connected to. |
|
 |
1968RT
Joined: 13 Mar 2010 Posts: 51 Location: michigan
|
Posted: Thu Oct 31, 2013 9:18 pm Post subject: |
|
|
I hooked the signal source to 3 different inputs and also pushed the video source button. There is no video when the menu button is pushed - which should work even when no input is connected, and nothing when the DEMO button is pushed. |
|
 |
Google
|
Post subject: Advertisement |
|
|
|
 |
JTS1957
Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away
|
Posted: Fri Nov 01, 2013 1:09 am Post subject: |
|
|
Is high voltage present? |
|
 |
|