willijohn
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Mar 10, 2010, 2:12 PM
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Thomson ICC21 Chassis
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Hi there.
My name is John Mathias.
I am a retired TV engineer.
Have a problem with my own set , Thomson ICC21 61" rear projector.
Fault is :-
Set won't start. Red led in on/off switch pulses 3-3 times after going amber for a second after switch on.
There was no cracking or noises when it failed , it just did’nt come on one day.
Checked Line output transistor & surrounding Components.
I find the standby PSU is running ok.
I found that CP150 (+6 volt reservoir) had very high ESR so replaced it with 2,200UF 25 volt cap.
When I disconnected the LOTX & connected 40 watt lamp across USYS output of SMPSU this supply comes on for a few seconds then powers down.
I suspect that the SMPSU is going into protection mode.
I have replaced the Line output transformer & Field output IC , TDA8177.
Not yet connected the EHT & focus leads from the new LOTX to isolate the HV & Focus blocks from suspicion.
Still remains with the same fault.
Does anyone know what the fault code 3-3 means?
I have the circuit diagram but no other service data.
Can anyone tell me how to find out why it’s going into protection mode.
HELP will be much appreciated PLEASE.
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01656724224 / 077511473566
the_teleman@btopenworld.com
John Mathias
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