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Sharp LC52sb55u - 1 blink    
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jh573561



Joined: 11 Jun 2017
Posts: 3
Location: West Virginia, US

PostPosted: Sun Jun 11, 2017 8:23 pm    Post subject: Sharp LC52sb55u - 1 blink Reply with quote

Hello, this is my first post here. Just recieved a Sharp LC52sb55u for free today.
The problem is the fast 1 blink issue,green power light, no OPC flash. When I do the channel UP,
volume down the screen lights up for a split second and I can see the LCD then a relay clicks and it goes back to flashing. If i hold the power and input buttonswhen plugged in, the same thing. But if i hold channel down, volume up the backlight flashes but the tv stays on. I can see the screen with a flashlight. This leads me to believe it is a lamp error. Im hoping it may just be the power supply needs changed but from what ive read it may be a lamp failure. I have seen videos where you can jump the transister on the power supply board for error protection to find out for 100% it is the lamps but I do not know which transister that is on this model. I am inter-mediate in repairs, but not proficient. I can do the soldering just fine, but definitely cannot delve into changing the inverters and/or lights.
Any help in finding out would be greatly appreciated.


Last edited by jh573561 on Sun Jun 11, 2017 11:43 pm; edited 2 times in total
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JTS1957



Joined: 21 Jan 2009
Posts: 2266
Location: Far, Far Away

PostPosted: Sun Jun 11, 2017 11:39 pm    Post subject: Reply with quote

https://elektrotanya.com/sharp_lc-52sb55u_sm.pdf/download.html

You may have to set computer to an earlier date to get by your browsers 'we know what's good for you' - complaint that their (elektrotanya.com) certificate is out of date.
jh573561



Joined: 11 Jun 2017
Posts: 3
Location: West Virginia, US

PostPosted: Sun Jun 11, 2017 11:46 pm    Post subject: Reply with quote

I downloaded the manual and looked through the board shematics but it doesnt label the transister im looking for, at least not in any sense that i can understand.
JTS1957



Joined: 21 Jan 2009
Posts: 2266
Location: Far, Far Away

PostPosted: Mon Jun 12, 2017 12:17 am    Post subject: Reply with quote

The disassembling of the panel to observe which bulb(s) aren't lighting or have blackened / broken ends may be easier / quicker.

EDIT:
Inverter boards (Master & Slave) are considered part of the panel and are NOT shown in manual. You can check electrolytics. Be sure each bulb is plugged in.
Transformers: comparative resistance readings for primaries and secondaries.
jh573561



Joined: 11 Jun 2017
Posts: 3
Location: West Virginia, US

PostPosted: Mon Jun 12, 2017 2:27 am    Post subject: Reply with quote

JTS1957 wrote:
The disassembling of the panel to observe which bulb(s) aren't lighting or have blackened / broken ends may be easier / quicker.

EDIT:
Inverter boards (Master & Slave) are considered part of the panel and are NOT shown in manual. You can check electrolytics. Be sure each bulb is plugged in.
Transformers: comparative resistance readings for primaries and secondaries.


Ok, i checked the lights, they are all functional and none have burnt ends. From what i can tell, its faulty error codes. The one issue that concerns me is the tv will shut off when I try to access the service menu. If it unplug and hold channel down, volume up and plug it back in then the backlight comes on for a second then goes dark but the picture is still there. I am even getting sound output. I have snooped around as mich as possible and the solution so far to people that have the same issue is to jump the error transistor. Its labelled as C7558 on some power sources but i cannot locate it on this one. I have found an error pin on the master inverter board, which leads to a transistor JP7593A on the bottom of the pcb.
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