RCA TV F27252GY need assistance with EPROM settings.

[Lehrbach]

I Purchased this TV from a friend, however he told me that he had attempted
to change some color values in the service menu..upon inspection these are
the current settings:

Horz Freq P01 V12
Horz Phse P02 V09
EWDC Wdth P03 V03
EW Apltde P04 V04
Virt DC P05 V09
Virt Size P06 V11
Red Bias P07 V31
GreenBias P08 V14
Blue Bias P09 V26
Red Drive P10 V31
GreenDrve P11 V28
Blue Drve P12 V30

Can anyone assist with restoring these values?

 

[RonKZ650]

Horz Freq P01 V12

Horz Phse P02 V09
EWDC Wdth P03 V03
EW Apltde P04 V04
Virt DC P05 V09
Virt Size P06 V11
Red Bias P07 V31
GreenBias P08 V14
Blue Bias P09 V26
Red Drive P10 V31
GreenDrve P11 V28
Blue Drve P12 V30

Can anyone assist with restoring these values?

Those values are all OK as a baseline. What problem do you have? For basic
settings, turn down the color then set parameters 7-8-9 red-green-blue bias to
best B/W picture.
Ron

 

[Lehrbach]

I'd like to restore the original factory settings in particular for the
bias and drive values..I would prefer to reset these values instead of
using my judgement to correct them.

Thanks,
Tim

 

[David]

Unless you have the values written down before they were changed, you will
need to do a proper alignment on the values in question. Each tv set has
its own individual values for the alignments based on the specific slight
component differences.

If you want to reset the gray scale levels, you will need the correct signal
generator and a color temperature analyzer. Missing the color temperature
analyzer, the levels will have to be set by eye by someone with enough
experience to know how the b/w signal generator should look.

David

..com...

 

[Art]

Chipper Checker with the appropiate software version should set the E_Prom
to manufactured default.

 

[Lehrbach]

Unfortunately I don't have access to a chipper checker or analyzer.

I used the advice about turning to the color levels down on the menu,
then going into the EPROM settings and changing the color values on P7-P12
until the B/W looked appropriate...an improvement, still a little off
though.

I used a THX Optimizer DVD to check the B/W levels.

The settings are now:

P07 V30
P08 V25
P09 V26
P10 V28
P11 V28
P12 V28

The biggest change was the Green Bias, changed it from V14 to V25.

There are also settings from P14-P27 which he hasn't messed with because a
password value for P13 has to be entered (77).

P14 PLL Tuning
P15 4.58 Mhz tmp
P16 Video Level
P17 FM Level
P18 Bt trim
P19 RF AGC chan 6
P20 RFAGC band 1
P21 RF AGC band 2
P22 RF AGC band 3
P23 DPIP Chroma
P24 DPIP Tint
P25 DPIP bright
P26 DPIP Contrast
P27 Factory Tint

P27 Factory tint

 

[Lehrbach]

Unfortunately I don't have access to a chipper checker or analyzer.

I used the advice about turning to the color levels down on the menu,
then going into the EPROM settings and changing the color values on P7-P12
until the B/W looked appropriate...an improvement, still a little off
though.

I used a THX Optimizer DVD to check the B/W levels.

The settings are now:

P07 V30
P08 V25
P09 V26
P10 V28
P11 V28
P12 V28

The biggest change was the Green Bias, changed it from V14 to V25.

There are also settings from P14-P27 which he hasn't messed with because a
password value for P13 has to be entered (77).

P14 PLL Tuning
P15 4.58 Mhz tmp
P16 Video Level
P17 FM Level
P18 Bt trim
P19 RF AGC chan 6
P20 RFAGC band 1
P21 RF AGC band 2
P22 RF AGC band 3
P23 DPIP Chroma
P24 DPIP Tint
P25 DPIP bright
P26 DPIP Contrast
P27 Factory Tint

P27 Factory tint

 

[David]

It will set it to the defaults, but he was asking for the settings that were
in the eeprom before they were changed. Those are the already aligned
values.

The settings he needs to change are relatively easy with the proper
equipment, and can be done very close by eye by someone with experience.

David

 

[Lehrbach]

Correct, I basically need to know the original settings, the trouble is, I
don't own any of the equipment needed to check it.

So I will either need someone to show/tell me the original eprom values
for this RCA model, or find a cost effective way to do this...Does a
service manual for this RCA model list the original values?, is there
something inside the chassis that might tell me this?

Thanks,
Tim

 

[Art]

Thomson Manuals normally give only generic values for this data. Correct way
is to take it to a service company that does have Chipper Checker and pay
them to reinitialize that information. Since you do not have Chipper Checker
or the necessary interface and software this may be the required solution.
Be-labouring the point via this news group will not repair the set for you.
The information given to you is what the professional repair technicians do
to resolve these customer created FUBARD sets. You may have a service
technician come out and show you how to correctly do this with his Chipper
Checker Equipment, of course, service call fees and labour are expected to
be charged for this service.

 

[John Del]

Subject: Re: RCA TV F27252GY need assistance with EPROM settings.

From: "Lehrbach" [email protected]
Date: 8/22/04 6:45 AM
Message-id:
<4bf4cded780d385b7e233df8befe44e5@localhost.talkaboutelectronicequipment.com>

..Does a

service manual for this RCA model list the original values?, is there
something inside the chassis that might tell me this?

Thanks,
Tim

Tim, you're not getting this. As David said, the original values that shipped
with your TV were ALIGNED values, done on the assembly line. If they are
changed without archiving the original values, the only way of getting it back
is to do a proper alignment. Even the Chipper Check software won't recover the
original ALIGNED values. When CC does a "reinitialize" function, it only
resets those masked locations that were somehow changed, but still leaves the
aligned values alone.

If you buy a new eeprom from RCA, there is a 99% probability that you won't
even get a picture with the new eeprom at the centered default values until the
alginment begins.

So unless your friend wrote down the values he changed, a re-alignment is the
only way to get the TV back to normal.

John