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Toshiba 32AV554D

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Davy:
Have this set dead with no standby light.... 4.9V at the output and 3 Volts coming back to the PSU.

From another post elsewhere, I posted here because I didn't want to hi-jack the thread, it was mentioned the 3 Volts is voltage protection, I'm pretty sure in this case it was stuck in standby.

I tried another 680uF on the 5 Volt rail still no light, so I checked the cpu crystal and that reads OK on the frequency counter.

I just can't see what the 3 volt does with no standby light and no main power 'relay activated',  this comes from the main board back to two or three smd transistors on the power board - apart from protecting the main power supply.

"Stumped"... what next? I appreciate any idea's or circuits, memory or cpu perhaps.

The power board is a Mitsumi SRV2169WW-f
Main board is Toshiba PE0630  V28A000

Dave

Keith:
the STRF chip in the PSU can cause problems, but I would think you have corrupt flash boot loader data, you could try to find a file but probably best to replace the main board, but make sure you get the correct type, they are different depending on the make of the screen.

Keith

Davy:
I get no communication at all. I get the 'Power ON' pulse when pressing the power button but still no standby light.... I even tried powering the 5V from an external source and changing the 5V decoupling capacitor, no hash on the supply at all.

I'll check the STRF chip just in case, thank you for your reply Keith.

Dave

Keith:
Sounds like corrupt boot loader, replacement main board is the best option, if available

Keith

watteau:
Hi,
IC150 corruption can give this problem,  pre-programmed IC's, CHS: E2P061 (SHARP DISPLAY), E2P060 (LG DISPLAY) - £5.50 + VAT,   also  IC151 can need replacing, E2P069 (BLANK), at the same time,  worth a try.
Regards

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