SCT 11 táp problémák

Symptom:
It is occurred "No Power" problem due to IC801 STR(SMR40000) part
defect on the Power Supply board(SMPS).
When "No Power" problem occurred, the environs parts including HC801
(HIS-0169B) and DZ801(R2KN) characteristics are changed due to
IC801(SMR40000) defect.

Cause : 
STR(SMR40000) defect is caused by Flip-chip circuit open inner IC or
MOS FET circuit's short between D-S and D-G. (STR margin narrow)
STR(SMR40000) part's defect has an influence to environs(related) parts
characteristics changed including HC801(HIS-0169B) and DZ801
(Diode, R2KN) when the 'B+' voltages are raised up suddenly from
125V to 150V due to STR defect on Power Supply board.

Solution : 
Whenever servicemen repair the "No Power" problem due to IC801
(SMR40000) defect, the Set should be replaced all damaged parts
at the same time as follows:

Location 		OLD (before) Parts 		NEW (changed) Parts 

IC801 A4010 - 0066 STR, SMR40200C AA13 - 20004L STR, SMR40000L C
HC801 A4010 - 0071 IC, HIS-0169B AA13 - 20004M IC, HIS-0169C C
DZ801 0403 - 000692 Diode, R2KN 0403 - 000691 Diode, R2K C

Symptom: 
125V rail at approx 180V in standby (should be 140V)

Cause: 
Due to a mismatch in the resonubber circuit.

Cure: 
C852 should be changed to a polyester type 182 /50V
Part No: 2301-000111