Bush BLED42FHDAE No standby light

[matyka]

I aquired this TV today.
No stand by red led , all PSU voltages fine.
Could you help me what pin to short to force back light on ?

At this point i'm stuck, was wondering if the eeprom on the AV board is screwed. does any one have a copy of the eeprom for this TV. Any pointers on fault finding on the AV PCB, Any known faults for this model ?

Any other sugestions welcome.

PCB numbers as follows

PSU BL-0p415601-001 REV.1.2
Main A/V T.MSD306.69A.11345

[ReeceyBurger123]

Re: Bush BLED42FHDAE No standby light

Possibly a shorted voltage regulator on the mainboard, do you know how to check them ?

[matyka]

Re: Bush BLED42FHDAE No standby light

Hi,I have checked the voltage regulators on the mainboard and no shorted found.
I have all the voltages read ok from the psu connectors CON2 ,CON3, CON4

[ReeceyBurger123]

Re: Bush BLED42FHDAE No standby light

Normally they wont show up as shorted but just wont output the correct voltage.

[matyka]

Re: Bush BLED42FHDAE No standby light

If I have the right output voltages from all 3 connectors it that mean the voltage regulator is fine ? and output the correct voltages ?

[budm]

Re: Bush BLED42FHDAE No standby light

"No stand by red led , all PSU voltages fine" So do you mean the signal pins also have all the correct Voltages?
What DCV do you get at the signal pins?

[matyka]

Re: Bush BLED42FHDAE No standby light

Con2 I have at pin3 and 4 --23.98v
Con3 I read at pin5,6,7 and 8 -- 23.96v
Con 4 at pin1and2 :12v. Pin6,7,10 and 11 --5v. Pin8 stby 4.98v. Pin9 on/off 2.89v
All this voltages read when tv plug in to the main
No light coming up and no standby red lihgt you could see.

[budm]

Re: Bush BLED42FHDAE No standby light

Well at least the main board is sending the ON/OFF signal, but I do not know what the root cause of the problem is on your main board. Look at the LED driver board to see if the main board is sending the BL-ON to the LED driver board.

[matyka]

Re: Bush BLED42FHDAE No standby light

Hello,I have plug in the tv and measured from the main board (T.MSD306.69A 11345) to the led driver and I don't have BL-ON printed on board just BK-ON and I have no current going through.
ADJ has 1.323V

All 24v present on the led driver coming from PSU
24v present on the main board coming from the PSU

[matyka]

Re: Bush BLED42FHDAE No standby light

Hi,just to let know after changing the main board T.MSD306.69A 11345 the tv now is working properly .
Thanks for all the help .