Samsung HT-D4500 Service Manual page 19

■ BD HTS SMPS consists of 2 converters
• Main converter
• ICM801, TS802S
Makes voltages for main board
•
Works always, but only 5.4V is output in stand-by mode
•
No 5.4V output
• Check fuse FP801S
• ICM801 pin 2 over 1V
• ICM801 pin 7: 14~18V
No voltage after power on
No 12V
•
• No -28V (-VP)
• No -12V
• No 4.1V (±VFD)
• No all above voltages
No PVDD voltage
ICA801 pin 6 2~4V
•
ICA1 pin 7 14~19V
•
•
•
• •ICA1 1V < pin 2 < 4.2V
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• Amplifier converter
• ICA801, MA801, TA801S
Makes amplifier PVDD voltage
•
Works after power on
•
→ Replace if open
→ Check for shortage
→ Check secondary diodes direction (DM825/826): replace ICM1
→ Check MM821
→ Check TRM824, TRM825
→ Check ICM821, TRM821, TRM822
→ Check TRM823
→ Check TRM826, Pon signal (CN803 pin 4)
→ Check TRA802
→ Check TRA801/802
→ Check OCM801
→ Check MA801, TA801S, DRA821/822
→ Check for shortage
Replace ICA1
4. Troubleshooting
4-3