LED BLINKING CODES - or Error Codes - SONY WEGA TRINITRON - HA - SERIES Color TVs
No picture, No sound. Standby LED blinks six times or stays lit without any blink.
Suspected parts
[1] LOT [Line Output Transformer] [NX 4751 M34A]
[2] Horizontal out transistor [2SD 2624-CA]
[3] ABL [Automatic Brightness Limiter] resistors (R511, R512, R568).
All part numbers will be printed on both sides of the printed
circuit board. Check ABL control resistors (R511,R512,R568, R513 &
R510) for open. If any one among them did fail, the main system control
IC will sense it as an over voltage, and will give you indication as
six blinks of standby LED. Don’t misunderstood it to be an over voltage
indication. Check components attached to pin number ‘2’ of LOT, before
replacing it.
LOT fault detection
If 135VDC drops as set is switched ON
Desolder out the horizontal output transistor [Q801 –
2SD2624-CA], and switch ON the set without it. Now check whether the
voltage drops or not. If not, replace the transistor with a new one,
and switch ON the set for a short period of time, say 3 to 5 seconds.
Switch it OFF, unplug the set from AC mains, and feel the heat of the
replaced transistor. If it overheats within this short period of time,
make sure that LOT is defective.
If the voltage drops without connecting the horizontal output
transistor, check [C807-330PF, C808-0082PF, C814-12KPF &
C812-0.033Uf (yoke return capacitor), for any leak or other defects.
Check C811-1Uf 250V too. Replace it with a new one. If any of the low
value capacitors indicated above gets opened, horizontal output
transistor will get shorted as soon as we switch ON the set. This is a
common fault and should be checked well, if horizontal output transistor
found shorted [Collector to Emitter leak]
Before replacing the horizontal output transistor with a new one,
check these capacitors, and replace them if suspected. It is a best
practice to replace these capacitors, along-with horizontal output
transistors. Check all the solder terminals at horizontal output stage
circuit, for any loose or dry soldering. Re-solder all the suspected
solder terminals, by applying a little more solder, without making any
solder bridge short between adjacent solder terminals
