YES, YES, YES, now it works. Thank you for great support. I bought the BU2508AF at RS Components (3 euros). Regards, Peter

Hi Paul, You are right!! the HT transistor (which is called TR33) has a short circuit. Type is btw BU 2508 AF. I will hunt one of these down and let you know how things come along after I replaced it. Thanks for the detailed explanation Regards, Peter

Keith, The mystery continues Voltage across C53 is 0.9V DC AC voltage R58<->GND is varying 6 V - 9V. This is the same when I removed C50 (R58 is difficult to get to) D35 and D36 seems to be working as diodes ...I'm begining to loose hope, here. Anyhow, I need to pause my work for a couple of days since I will be traveling. Regards, Peter

Thanks for taking the time, Keith, The voltage across C1 on module 15 is 2 VDC (3.8V AC!!). The fuse is ok. C3 has 0V. I upgraded my profile so now I have the diagrams (not that it helps ). However I measure some strange voltages, I think. For instance: on top of C9, module 4 I have 300VDC as it should be, but also 737VAC?! Across C29 I measure 5.7VDC

Hi Paul, Yes, the voltage across C52 "+8v st. by power" is only 2V. Could you please tell which one is the HT transistor and maybe also the numbers for the 6.8nF caps you're mentioning? I don't have a circuit diagram, so I'm reading the numbers directly from the PCB. I just measured the T2 primary side which is: Pin1,2,3,4 = 0V

Hi Keith, Thanks for your suggestions. I have 330V on pin5 of T2 (measured from pin2 which is GND, I guess). Across C9 I measure 320V. On Collector of TR4 I have the 2V. So everything seems ok. However, you mention that marginal components can stop the circuit and actually I measured C31 to 80µF in stead of 100µF - so my next step will be

Hi, My MX4000 just went dead - after it has been turning off randomly for a few days. Now there is not even a stand-by light. I can hear some noise from Transformer T2 when switching on the TV - that's all. I heard that C29 and C31 was the ones to check in the power supply, but they are ok in my set. I have alse checked C102, C103, C61. Does anyone