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Louie
Louie, Technician
Category: TV
Satisfied Customers: 2557
Experience:  25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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Sharp lc-52d64u power light blinking, 8 years sharp

Customer Question

sharp lc-52d64u power light blinking
JA: Can you guesstimate how old your Sharp is? And just to clarify, what's the exact model?
Customer: 8 years sharp lc-52d64u
JA: What troubleshooting have you tried?
Customer: service mode i believe
Submitted: 7 months ago.
Category: TV
Expert:  Louie replied 7 months ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, any pattern/sequence to the blinking? Was the blinking a result of changing anything while in Service Mode?

Still, would the blinking start immediately upon plugging back in? ...or only after attempting to turn on?

Customer: replied 7 months ago.
i tried to turn on the tv this morning. all i got was a blinking light
Customer: replied 7 months ago.
immediately after plunging in the tv.the green light would blink
Customer: replied 7 months ago.
i didn't change any settings in service mode. the tv powers up while attempting to go into service mode but immediately turns off
Expert:  Louie replied 7 months ago.

"...any pattern/sequence to the blinking?..."; something like ...5 blinks...pause...5 blinks...pause...5 blinks...pause

Customer: replied 7 months ago.
1 blink every second nothing on the screen
Expert:  Louie replied 7 months ago.

Appreciate the additional information.

If all external factors have been checked and ruled out, then the described symptom and "...power light blinking... 1 blink every second..." almost always indicate that the TV is kicking in auto-protect mode due to an to an internal hardware issue.

The above would require that the unit be opened up for visual inspection, voltage/continuity/resistance checks, confirm faults and effect repairs.

Based on this:

  • are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?
  • • perhaps more importantly, would you be comfortable working on the inside circuitry? ...even when LIVE?
Customer: replied 7 months ago.
tv is already open. yes dmm
Customer: replied 7 months ago.
soldering iron. yes live voltage
Expert:  Louie replied 7 months ago.

Great on the DIY!

Please post back with clear pictures of the back of the TV showing the different boards. This would serve as common reference/

Click HERE.

Customer: replied 7 months ago.
Expert:  Louie replied 7 months ago.

Appreciate the pictures.

The Service Manual stipulates that the 1-blink error code as a "Lamp Failure"

The only doable check is to determine the presence and consistency of the power supply voltage to the inverters and the inverters high frequency/high voltage output supplied to the lamps.

The above is actually a test by process of elimination.

Customer: replied 7 months ago.
what voltage values and locations am i looking for?
Customer: replied 7 months ago.
I've read some places there is a way to temporarily bypass the error code so the tv stays on. is this true ?
Expert:  Louie replied 7 months ago.

Voltages would be from the 3-pin connector of the power supply board to an inverter. The voltages would be +60V and +10V.

Yes, that would be pressing simultaneously the TV's CH▼ and the VOL▲ while plugging back in.

But still, the voltage readings would be necessary to pinpoint the most likely suspect.

Customer: replied 7 months ago.
values state 60v and 12v one the circuitboard are your values correct?
Customer: replied 7 months ago.
ive read jumping capacitor c7558 will bypass error codes so the tv will stay on to access service menus. could this be true ?
Expert:  Louie replied 7 months ago.

Per SM yes; and the exact values would be relative.

If the power supply is able to provide the +60V to power the inverters, then it would be good.

Next check would be for the high frequency/high voltage output supplied to the lamps.

Sorry but not familiar with the "... jumping capacitor c7558 will bypass error code..."

Please post back how you would want to approach this and/or should additional information be needed.

Customer: replied 7 months ago.
how would i test voltage to the lamps? and values?
Customer: replied 7 months ago.
how can i test these voltages and the tv doesn't cycle on?
Expert:  Louie replied 7 months ago.

The voltages would be present momentarily hence would be able to check its presence. The blinking would indicate that it has kicked in auto-protect mode. and the voltage should be cycling.

Try disconnecting the inverter boards 1 at a time and determine if the blink code would change.

Likewise, the +60V may then be consistently available if the PSU is good.

Customer: replied 7 months ago.
power supply checked out at 60v and 12volts. when i unplug both inverters and ch own vol up the green lights stays solid lit. no blinking
Customer: replied 7 months ago.
stays that way for about 5 sec
Customer: replied 7 months ago.
there has to be way to keep this tv on in service mode
Customer: replied 7 months ago.
while holding vol dwn and input the tv cycles on. see analog channel 2 in right hand corner. and i also see a k on the screen. then tv shuts down
Expert:  Louie replied 7 months ago.

Very significant findings and observations as it would appear that the power supply and the inverters are all working as expected.

On this particular model, I am inclined then to suspect the likelihood of a failing CCF lamp based on the above.

Please post back how you would want to approach this and/or should additional information be needed.

Customer: replied 7 months ago.
can these lamps be tested with any instruments that i have ? is there a way to keep the tv on while accessing the service menu so i can perform a lamp test with the software on the tv?
Expert:  Louie replied 7 months ago.

Sorry but no tests that I am aware of.

The only test can be for the (even momentary) presence of the inverter's high frequency/high voltage output supplied to the lamps would be with the use of a neon bulb tester very close but carefully to the inverter's transformers.

As posted above, by process of elimination, if present would point to the lamp(s).

And to my recollection, the lamps are embedded into the LCD panel hence in most instances, this would require replacement of the whole panel.