[TechAssist] Toshiba 32A42A, HOT overheats
- From: "Yvon Roy" <atlantek@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 9 Jan 2003 11:19:11 -0400
Hi, this is my first email on techassist, I like the strict rules on it.
I have a Toshiba model 32A42A with HOT overheating real fast at start-up and
goes into shutdown in about 15-20 sec. Before it shutdown the picture has
time to come on and both side of the picture is narrow like a low voltage
problem and gets narrower real fast as Q404 (HOT), D444 and D461 heats up
and then shutdown.
Checked the b+ and is at 135volts, it the schematic it says 125v but there
shouldn't be a problem like that even if it is running at 135v.
The waveform at the collector of the HOT is 1300vpp and is the way it should
be also checked the driver input and output waveforms and they are showing
to be normal.
Disconnected the HV anode from CRT and the HOT still overheats also tried
with the CRT board disconnected and still the same problem. ringed the FBT
and ringed ok.
Used the HA2500 and did the load test and tested ok but that is only done it
low voltage condition. Tried a new HOT Transistor and replaced the two large
diodes next to it, D444 and D461.
Could it be the FBT?
Any help appreciated.
Yvon Roy
Atlantek TV Service
1295 Miramichi Ave
Bathurst, NB
E2A 1Y1
Tel: 506-545-7805
Fax: 506-546-2171
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