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Toshiba 32HF72 dead    
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1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan
PostPosted: Thu Sep 26, 2013 10:19 pm    Post subject: Toshiba 32HF72 dead Reply with quote
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.
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Fri Sep 27, 2013 12:34 am    Post subject: Reply with quote
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
PostPosted: Thu Oct 31, 2013 8:40 pm    Post subject: Reply with quote
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
PostPosted: Thu Oct 31, 2013 8:58 pm    Post subject: Reply with quote
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
PostPosted: Thu Oct 31, 2013 9:18 pm    Post subject: Reply with quote
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.
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Fri Nov 01, 2013 1:09 am    Post subject: Reply with quote
Is high voltage present?
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