TEACLCD4282FHD Stuck in Standby

[peter6701]

Hi everyone, I need some advice please...

I have a TEAC LCD4282FHD currently stuck in Standby.  The unit consists of the following:

IPB747A ver 1.5 Power Supply Board.  Looks Caps look ok.  Output voltages are present for Mainboard connection, and look o.k.  Output for PSON=4.5v. (Outputs for +/- 5v, sit just over 5v.  Just over 12v is seen for the 12v output).  I've had no luck finding a schematic for it, so if anyone can point me to one, it would be appreciated.

The Panel is an LG - LC420WUF-SAA1

Digital Board PL.MS6M20S.2B interfaces between the main board and the TCON. (I haven't been looking at these yet).

Main Board is T.MSD306.8B.

Observations:
1. Standby Light is On - Solid (Red)
2. Power Supply does 'tick' once when mains switch is activated
3. Power Supply 'ticks' when the power connector to the main board is removed. (Is this normal when no load is encountered)?
4. There's a BK-ON connection between the mainboard & power supply.  This remains low. (Am I right in saying this should go high from the mainboard when we exit standby mode.

Any suggestions or known problems ? (I haven't found much from my research).

If anyone has a schematic for the p/supply or m/board....I'd be grateful.

Regards

Peter

[sparky]

Hi check main smoothing cap

[peter6701]

Not so simple...done that.  I need to dig a little deeper.

[Turnip]

Hi Peter,

Guess with a T.MSD panel of any sort, corrupt Eeproms are favourite for first bet - had a few, but no bin yet for your model.

All the best - Chris.

[peter6701]

Replaced the MSD306.8b board with one from a NeonIQ Set....TV works...except for the Remote.  I guess the code & the ability to re-flash or update the board with the correct teac code would solve it 100%.

Ideas anyone ?

[Turnip]

Hi Peter,

Why not get a Neon/Cello  RCU, might be the cheapest option - Chris.

[peter6701]

Thanks Chris

I have another theory though.  Looking at the MSD.306, the interface connector for input is labelled (top) 'IR & Key'.  Rear side is labelled 'gnd k7 k6 k5 k4 k3 k2 k1 k0 gnd ir grn red 5vir'.

I have installed the NeonIQ board into a Teac TV.  The LED indicator is o.k.  However...the TV buttons don't match what the TV is expecting.  They appear to be mapped differently.  I need to pull it apart again to map it out.  That explains the buttons.

IR input seems to be separate.  I need to prove it's receiving IR Data.  I get no flicker of the status light...I don't know if this is normal or not.

Looks like a job for the weekend.

regards

Peter

[Turnip]

Hi Peter,

Guess an Eeprom jobby, famed with Neon/Cello stuff.

You didn't mention the board you have, But I have a C2751F meself that needs a kick up the Eeprom, and would love a bin.

All the best - Chris.