Toshiba 42H81 Blinking on and off light

good day sir, problem with your tv's switching power supply, at this point you have a choice of visiting/calling your service center, or do it your own? If you want to do it your own, you may need you dissassemble your tvs back panel, to have access to the circuit, locate the switching power supply section and test the following.

• the switching power transistor usually with a heatsink.
• the oscillator circuit, with a pulse width modulator IC that controls the switching.
• the high speed power transformer.
• the feedback circuit.
• the capacitor and voltage regulator.

test all of them until you get the bad part. I don't want to sound technical, but thats how service centers do it. You may need to get schematics.

I suggest you call your service center, and let them do it.

Hi, your power board is in a weak state. this is being caused by major component failuer. replacing the power board will fix this issue.

The power supply is in protect mode. There is most likely a short on one of the boards, or the high voltage generator, or a scan amplifier, or the power supply itself has a failure. Without troubleshooting the set it is impossible to know.


Jerry G.

In this unit it's likely the convergence amps are the cause. Those and possibly the 2.2ohm resistors (especially R7726) in the yoke return path - that's why you found the open fuse.
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

I have a Toshiba 42H81 that has the power indicator light blinking and the TV will not turn on

Replace the convergence amps and check the return resistors in path to the yoke from that circuit.
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

the lamp in the projector might have went. try replaceing it. to do so try

ADTECH SYSTEMS they may help

there in mass.
call David Crepeau at 978 261 1087 tell him Ryan Bolduk sent you
depending where you live. They maybe able to send someone out from there sub company

have you try to switch it on using the contol on the tv..?

Good Day,lizbg;
Check the solder connections at the negative side of both C809 and C810. Resolder if necessary. This a common problem with model.
Good Luck, Big Irish.

the tv will try to reboot a few times. just let i try and eventually it will start blinking red. if you could count the red blinks then i can further assist you.