Toshiba 27A45 TV will not turn on

[kramden66]

Ichecked the fuse and diodes and found nothing wrong , any suggestions ? one oif the transistors ?

mike

[jts1957]

So what is the voltage reading on which of the diodes?
_________________
You're over there, I'm over here.

[jts1957]

27A45
ELECTRICAL REPLACEMENT PARTS LIST
Location No. TSB P/N Reference No. Description
D001 BZ410037 D97U03301B DIODE,ZENER MTZJ33B T-77
D104 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D105 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D106 BZ410020 D97U05R11B DIODE,ZENER MTZJ5.1B T-77
D109 BZ410054 0021721150 LED SLR-342VCT32
D113 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77
D402 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC
D403 BZ410019 D97U03001B DIODE,ZENER MTZJ30B T-77
D404 BZ410020 D97U05R11B DIODE,ZENER MTZJ5.1B T-77
! D405 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC
! D406 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77
! D407 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC
D408 AD302110 D2CF0715L0 DIODE,SILICON ERD07-15L50
D409 AD301980 D2CF2016L0 DIODE,SILICON FE201-6L49
D410 BZ410019 D97U03001B DIODE,ZENER MTZJ30B T-77
! D411 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC
D414 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC
D415 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC
D416 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D417 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D419 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
! D501 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC
! D502 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC
! D503 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC
! D504 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC
! D505 AE006082 D28F0PRA60 DIODE,RECTIFIER 30PRA60-FC
! D506 AD300731 D2WXN49370 DIODE,SILICON 1N4937
D507 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D508 BZ410066 D97U06R21B DIODE,ZENER MTZJ6.2B T-77
D509 AD300671 D97U01801B DIODE,ZENER MTZJ18B T-77
D510 AD301980 D2CF2016L0 DIODE,SILICON FE201-6L49
! D511 AD300731 D2WXN49370 DIODE,SILICON 1N4937
! D512 BZ410010 D28T21DQN9 DIODE,SCHOTTKY 21DQ09N-TA2B1
D513 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D514 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D516 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D517 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D520 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
! D523 AD300671 D97U01801B DIODE,ZENER MTZJ18B T-77
D524 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D525 BZ410094 D97U01501B DIODE,ZENER MTZJ15B T-77
D528 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77
D601 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D602 BZ410058 D97U08R21B DIODE,ZENER MTZJ8.2B T-77
D604 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D605 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D606 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D607 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D608 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC
D701 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D702 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D703 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D704 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D705 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D706 AD300070 D97U01201B DIODE,ZENER MTZJ12B T-77
D709 BZ410066 D97U06R21B DIODE,ZENER MTZJ6.2B T-77
D801 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D802 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D803 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D810 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D811 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
D812 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77
_________________
You're over there, I'm over here.

[kramden66]

i checked the diodes with a multi meter on diode setting and they read good , now as far as the little mini ones that are very small i checked most and they are ok , starting to thing its a transistor on a heat sink but don't have a transistor checker

mike

[jts1957]

First of all, as my signature states: "Since you're over there and I'm over here," we have a basic problem. We have a communication issue, unless you start using the nomenclature that is silk-screened on the PCB you have in front of you, we are not going to get very far.
As the parts list of diodes shows there are many, many types of diodes used in many, many locations throughout the set.

Does that meter have a DC voltage setting and can you take specific instructions? (For example: Measure the dc voltage across C507 and post)
_________________
You're over there, I'm over here.

[kramden66]

yes i could measure the voltage but is any getting to it i wonder

mike

[jts1957]

Houston, we have a problem.
_________________
You're over there, I'm over here.

[kramden66]

C507 has 155 volts across it, i will recheck this cap to make sure its ok , after checking around the board and then creating this post i started to think it was beyond a cap or resistor or diode , perhaps that transistor on the heat sink Q502 , i will recheck the electrolytic.

mike

[kramden66]

It tests good but to be sure i replaced it with a 470uf at 250 volts and still nothing

mike

[Pentode]

It's OK checking the rectified mains voltage... but what about the start up voltage for the switch-mode controller.

Before anything happens there needs to be the rectified mains AND the supply voltage for the power controller chip.

Your best bet is to get a schematic and do things logically rather than guess, are you sure it's dead and not just shut down because of a s/c line stage?

Remember:
Its the volts that jolt and the mill's that kill

Dave